.env

@@ -0,0 +1,6 @@
+DISABLE_DOCS=true
+
+MONGO_HOST=127.0.0.1
+MONGO_PORT=27017
+MONGO_USER=user
+MONGO_PASS=pass

.github/workflows/app-actions.yml

@@ -0,0 +1,67 @@
+name: app-actions
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - '**.py'
+    branches:
+      - main
+      - app
+  pull_request:
+    branches:
+      - main
+
+
+jobs:
+  mypy:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.9
+          architecture: x64
+
+      - name: Install dependencies
+        run: |
+          pip install mypy
+          pip install -r app/requirements.txt
+
+      - name: Run mypy
+        run: mypy --ignore-missing-imports ./app
+
+  pytest:
+    runs-on: ubuntu-latest
+    env:
+      MONGO_HOST: ${{ secrets.MONGO_HOST }}
+      MONGO_PORT: ${{ secrets.MONGO_PORT }}
+      MONGO_USER: ${{ secrets.MONGO_USER }}
+      MONGO_PASS: ${{ secrets.MONGO_PASS }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.9
+          architecture: x64
+
+      - name: Setup MongoDB
+        run: docker run --name mongodb -d -p ${{ secrets.MONGO_PORT }}:27017 -e MONGO_INITDB_ROOT_USERNAME=${{ secrets.MONGO_USER }} -e MONGO_INITDB_ROOT_PASSWORD=${{ secrets.MONGO_PASS }} mongodb/mongodb-community-server
+
+      - name: Install dependencies
+        run: |
+          pip install pytest==8.3.4 pytest-asyncio==0.25.3 httpx==0.28.1
+          pip install -r app/requirements.txt
+      - name: Setup moderated base cards
+        
+        working-directory: ./app/tools
+        run: python3 _add_base_cards.py -a 2 -f data/base_cards.json
+      - name: Run pytest
+        run: pytest -vs

.github/workflows/mypy-test.yml

@@ -1,22 +0,0 @@
-name: mypy-test
-
-on:
-  push:
-    paths:
-      - '**.py'
-
-jobs:
-  mypy:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Setup Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: 3.9
-          architecture: x64
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Install mypy
-        run: pip install mypy
-      - name: Run mypy
-        run: mypy --ignore-missing-imports ./app

.gitignore

@@ -2,6 +2,7 @@
 __pycache__/
 *.py[cod]
 *$py.class
+.idea/
 
 # C extensions
 *.so
@@ -170,3 +171,18 @@ cython_debug/
 
 # PyPI configuration file
 .pypirc
+app/.env
+
+# Node.js and React
+node_modules/
+build/
+dist/
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.eslintcache
+.DS_Store

README.md

@@ -9,15 +9,23 @@ Telegram mini-app where you have to choose one of two things.
 git clone https://github.com/IgorVolochay/thisORthat
 ```
 
+### Manual setup:
+
 2. The project is written in Python3.9. Make sure you have it on your system. Go to the project folder, create a virtual environment and download pip requirements:
 ```bash
 cd ./thisORthat
 python3.9 -m venv venv
 source ./venv/bin/activate
-pip3 install -r requirements.txt
+pip3 install -r ./app/requirements.txt
 ```
 
 3. Installing MongoDB database. You can use the [official manual](https://www.mongodb.com/docs/manual/installation/) to install MongoDB manually, or use a [Docker image](https://hub.docker.com/r/mongodb/mongodb-community-server) to run the container:
 ```bash
-docker run --name mongodb -d -p 27017:27017 mongodb/mongodb-community-server
+docker run --name mongodb -d -p 27017:27017 -e MONGO_INITDB_ROOT_USERNAME=user -e MONGO_INITDB_ROOT_PASSWORD=pass mongodb/mongodb-community-server
 ```
+### Docker Compose setup:
+
+2. Use docker-compose to automatically build the entire project. For correct build, it is better to use docker-compose version 1.29.2:
+```bash
+docker-compose up --build
+```

app/dockerfile

@@ -0,0 +1,11 @@
+FROM python:3.9.21-alpine
+
+WORKDIR /app
+
+COPY . .
+
+RUN pip3 install -r requirements.txt
+
+EXPOSE 5000
+
+CMD ["python3", "main.py"]

app/main.py

@@ -1,4 +1,191 @@
+import os
+
+import uvicorn
+import asyncio
+
+from dotenv import load_dotenv
+from fastapi import FastAPI, Depends, Response, status
+
+from schemas.api_schemas import *
+from schemas.base_schemas import *
 from mongo_worker import MongoWorker
+from tools.base_moderation import moderate_text
+
+
+load_dotenv()
+disable_docs = os.getenv("DISABLE_DOCS", "true").lower() == "true"
+
+app: FastAPI = FastAPI(title="This OR That",
+                    summary="OpenAPI schema for \"This OR That\" project!",
+                    version="0.1",
+                    contact={"GitHub": "https://github.com/IgorVolochay/thisORthat"},
+                    docs_url=None if disable_docs else "/docs",
+                    redoc_url=None if disable_docs else "/redoc",
+                    openapi_url=None if disable_docs else "/openapi.json")
+mongo_worker = MongoWorker()
+
+
+@app.get("/check_user", status_code=200)
+async def check_user(user_id: NonNegativeInt,
+                     mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    result = mongo.check_user(user_id)
+    return BaseResponse(result=result)
+
+@app.get("/get_user", status_code=200)
+async def get_user(user_id: NonNegativeInt,
+                   response: Response,
+                   mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    if mongo.check_user(user_id):
+        result = mongo.get_user(user_id)
+        return BaseResponse(result=result)
+    else:
+        response.status_code = status.HTTP_404_NOT_FOUND
+        return BaseResponse(result="User doesn't exist", error=True)
+
+@app.post("/add_user", status_code=201)
+async def add_user(new_user: AddUserBody,
+                   response: Response,
+                   mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    if not mongo.check_user(new_user.user_id):
+        result = mongo.add_user(new_user.user_id,
+                                new_user.username,
+                                new_user.first_name,
+                                new_user.last_name,
+                                new_user.photo_url)
+        return BaseResponse(result=result)
+    else:
+        response.status_code = status.HTTP_409_CONFLICT
+        return BaseResponse(result="User already exist", error=True)
+    
+
+@app.get("/get_card", status_code=200)
+async def get_card(card_id: NonNegativeInt,
+                   response: Response,
+                   mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    card = mongo.get_card(card_id)
+    if card:
+        return BaseResponse(result=card)
+    else:
+        response.status_code = status.HTTP_404_NOT_FOUND
+        return BaseResponse(result="There is no card with this card_id", error=True)
+    
+@app.get("/get_random_cards", status_code=200)
+async def get_random_cards(user_id: NonNegativeInt,
+                           response: Response,
+                           mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    cards_visited = mongo.get_visited_cards(user_id)
+
+    if cards_visited.error:
+        response.status_code = status.HTTP_401_UNAUTHORIZED
+        return cards_visited
+    elif not cards_visited.result.cards_visited:
+        random_cards = mongo.get_random_cards(10, True)
+        if random_cards:
+            return BaseResponse(result=random_cards)
+        else:
+            response.status_code = status.HTTP_404_NOT_FOUND
+            return BaseResponse(result="No active cards", error=True)
+    
+    result: list[Card] = list()
+    trys = 3
+    while len(result) < 10 and trys != 0:
+        random_cards = mongo.get_random_cards(10, True)
+        if not random_cards:
+            response.status_code = status.HTTP_404_NOT_FOUND
+            return BaseResponse(result="No active cards", error=True)
+        filtered_cards, filtered_cards_id = mongo.filter_cards(random_cards, cards_visited.result.cards_visited)
+        trys -= 1
+        if not filtered_cards:
+            continue
+        else:
+            result.extend(filtered_cards)
+            cards_visited.result.cards_visited.update(filtered_cards_id)
+
+    if not result:
+        response.status_code = status.HTTP_404_NOT_FOUND
+        return BaseResponse(result="No active cards fo this user", error=True)
+    else:
+        return BaseResponse(result=result)
+    
+@app.post("/add_card", status_code=201)
+async def add_card(new_card: AddCardBody,
+                   response: Response,
+                   mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    if moderate_text(new_card.choice_A) and moderate_text(new_card.choice_B):
+        card = mongo.add_card_by_api(new_card.choice_A,
+                                     new_card.choice_B,
+                                     new_card.author_id)
+        return BaseResponse(result=card)
+    else:
+        response.status_code = status.HTTP_400_BAD_REQUEST
+        return BaseResponse(result="Card has not passed base moderation", error=True)
+    
+
+@app.patch("/select_choice", status_code=200)
+async def select_choice(choice_data: SelectChoice,
+                        response: Response,
+                        mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    check_visited = mongo.get_visited_cards(choice_data.user_id)
+    if check_visited.error:
+        response.status_code = status.HTTP_404_NOT_FOUND
+        return check_visited
+    elif not check_visited.error and choice_data.card_id in check_visited.result.cards_visited:
+        response.status_code = status.HTTP_403_FORBIDDEN
+        return BaseResponse(result="Card already visited!", error=True)
+    else:
+        select_choice_result = mongo.select_choice(choice_data.card_id, choice_data.choice)
+        if select_choice_result.error:
+            response.status_code = status.HTTP_404_NOT_FOUND
+            return select_choice_result
+        else:
+            update_visited_result = mongo.update_visited_cards(choice_data.user_id, choice_data.card_id)
+            return BaseResponse(result="Select choice complite!")
+        
+@app.patch("/like_card", status_code=200)
+async def like_card(like_data: ReactionCard,
+                    response: Response,
+                    mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    result = mongo.like_card(like_data.card_id, like_data.user_id)
+    if not result.error and result.result:
+        return BaseResponse(result="Added like to card")
+    else:
+        response.status_code = status.HTTP_404_NOT_FOUND
+        return result
+
+@app.patch("/dislike_card", status_code=200)
+async def dislike_card(dislike_data: ReactionCard,
+                    response: Response,
+                    mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    result = mongo.dislike_card(dislike_data.card_id, dislike_data.user_id)
+    if not result.error and result.result:
+        return BaseResponse(result="Added dislike to card")
+    else:
+        response.status_code = status.HTTP_404_NOT_FOUND
+        return result
+    
+@app.post("/comment", status_code=201)
+async def comment(comment_info: AddCommentBody,
+                  response: Response,
+                  mongo: MongoWorker = Depends(lambda: mongo_worker)) -> BaseResponse:
+    if not moderate_text(comment_info.comment_text):
+        response.status_code = status.HTTP_400_BAD_REQUEST
+        return BaseResponse(result="Comment has not passed base moderation", error=True)
+    
+    result = mongo.add_comment(comment_info.author_id, comment_info.card_id, comment_info.comment_text)
+    if result.error and result.result in ["User doesn't exist", "Card doesn't exist"]:
+        response.status_code = status.HTTP_404_NOT_FOUND
+        return result
+    elif result.error:
+        response.status_code = status.HTTP_400_BAD_REQUEST
+        return result
+    else:
+        return result
+    
+
+async def main():
+    config = uvicorn.Config("main:app", port=5000, log_level="debug")
+    server = uvicorn.Server(config)
+    await server.serve()
 
 if __name__ == "__main__":
-    print("Hello World!")
+    asyncio.run(main())

app/mongo_worker.py

@@ -1,45 +1,214 @@
+import os
+
 import pymongo
 
 from datetime import datetime
+from dotenv import load_dotenv
+from typing import Optional
 
-from bson import ObjectId
+from schemas.base_schemas import *
+from schemas.api_schemas import *
 
 
 class MongoWorker:
     def __init__(self):
-        self.client = pymongo.MongoClient(host="127.0.0.1", port=27017)
+        load_dotenv()
+        self.client = pymongo.MongoClient(host = os.getenv('MONGO_HOST'),
+                                          port = int(os.getenv('MONGO_PORT')),
+                                          username = os.getenv('MONGO_USER'),
+                                          password = os.getenv('MONGO_PASS'))
         self.db = self.client["data"]
-        self.users_data = self.db["users_data"]
+        self.users_data = self.db["users"]
-        self.game_data = self.db["game_data"]
+        self.visited_data = self.db["visited"]
+        self.counters = self.db["counters"]
+        self.game_data = self.db["cards"]
+        self.comments_data = self.db["comments"]
 
-    def get_mongodb_info(self) -> None:
-        print(self.client.list_database_names())
-        print(self.db.list_collection_names())
 
-    def find_user(self, user_id: int) -> dict:
+    def check_user(self, user_id: int) -> bool:
-        result = self.users_data.find_one({"user_id": user_id})
+        if self.users_data.find_one({"user_id": user_id}):
-        return result
+            return True
+        else:
+            return False
 
-    def add_user(self, user_id: int, username: str, first_name: str, last_name: str, photo_path: str) -> ObjectId:
+    def add_user(self, user_id: int, username: str, first_name: str, last_name: str, photo_url: str) -> User:
+        new_user = User(user_id=user_id,
+                        username=username,
+                        first_name=first_name,
+                        last_name=last_name,
+                        photo_url=photo_url,
+                        registration_date=datetime.now().isoformat())
         try:
-            res = self.users_data.insert_one({"user_id": user_id,
+            self.users_data.insert_one(new_user.model_dump())
-                                              "username": username,
+            return new_user
-                                              "first_name": first_name,
+        except Exception as exception:
-                                              "last_name": last_name,
+            return new_user
-                                              "photo_path": photo_path,
+
-                                              "activity": 0,
+    def get_user(self, user_id: int) -> User:
-                                              "liked_post_ids": [],
+        return User.model_validate(self.users_data.find_one({"user_id": user_id}))
-                                              "disliked_post_ids": [],
+    
-                                              "comments_ids": [],
+
-                                              "registration_date": datetime.now().isoformat()
+    def get_and_update_counter(self, counter_name: str) -> int:
-                                              })
+        counter = self.counters.find_one_and_update(
-            return res.inserted_id
+            {"counter_name": counter_name},
+            {"$inc": {"counter": 1}},
+            upsert=True,
+            return_document=True)
+        return counter["counter"]
+    
+    
+    def get_visited_cards(self, user_id: int) -> BaseResponse:
+        document = self.visited_data.find_one({"user_id": user_id})
+        if not document:
+            check_user = self.check_user(user_id)
+            if check_user:
+                return BaseResponse(result=Visited(user_id=user_id,
+                                                   cards_visited=set()))
+            else:
+                return BaseResponse(result="User doesn't exist", error=True)
+        else:
+            return BaseResponse(result=Visited.model_validate(document))
+        
+    def filter_cards(self, random_cards: list[Card], cards_visited: set) -> tuple[list[Card], list[int]]:
+        filtered_cards = [card for card in random_cards if card.card_id not in cards_visited]
+        filtered_cards_id = [filtered_card.card_id for filtered_card in filtered_cards]
+        
+        return filtered_cards, filtered_cards_id
+    
+    def update_visited_cards(self, user_id: int, visited_card_id: int) -> Visited:
+        update_visited = self.visited_data.find_one_and_update({"user_id": user_id},
+                                                               {"$addToSet": {"cards_visited": visited_card_id}},
+                                                               upsert=True,
+                                                               return_document=True)
+        return Visited.model_validate(update_visited)
+
+
+    def add_card_by_api(self, choice_A: str, choice_B: str, author_id: int) -> Card:
+        new_card = Card(card_id=self.get_and_update_counter(counter_name="card"),
+                        choice_A=choice_A,
+                        choice_B=choice_B,
+                        author_id=author_id,
+                        creation_date=datetime.now().isoformat())
+        try:
+            self.game_data.insert_one(new_card.model_dump())
+            return new_card
         except Exception as exception:
             print(exception)
+            return new_card
+        
+    def add_card_by_base_model(self, new_card: Card) -> Optional[Card]:
+        new_card.card_id = self.get_and_update_counter(counter_name="card")
+        try:
+            self.game_data.insert_one(new_card.model_dump())
+            return new_card
+        except Exception as exception:
+            print(exception)
+            return new_card
+        
+    def get_card(self, card_id: int) -> Optional[Card]:
+        document = self.game_data.find_one({"card_id": card_id})
+        if document:
+            return Card.model_validate(document)
+        else:
+            return None
 
+    def get_random_cards(self, amount: int, active_status: bool) -> Optional[list[Card]]:
+        pipeline = [{"$match": {"active_status": active_status}}, 
+                    {"$sample": {"size": amount}}]
+        raw_items = list(self.game_data.aggregate(pipeline))
 
-if __name__ == "__main__":
+        if raw_items:
-    mongo = MongoWorker()
+            validated_items = [Card.model_validate(item) for item in raw_items]
-    mongo.get_mongodb_info()
+            return validated_items
-    print(mongo.add_user(123, "VolochayIgor", "Igor", "Volochay", "path/to/img"))
+        else:
-    print(mongo.find_user(123))
+            return None
+        
+
+    def select_choice(self, card_id: int, choice: str) -> BaseResponse:
+        if choice == "A":
+            count_choice = "count_choice_A"
+        elif choice == "B":
+            count_choice = "count_choice_B"
+        else:
+            return BaseResponse(result="Wrong choice", error=True)
+        
+        result = self.game_data.find_one_and_update({"card_id": card_id},
+                                                    {"$inc": {"count_total": 1, count_choice: 1}})
+        
+        if not result:
+            return BaseResponse(result="Card doesn't exist", error=True)
+        else:
+            return BaseResponse(result=result, error=False)
+    
+    def check_user_reactions(self, user_id: int, card_id: int) -> BaseResponse:
+        user_info: User = self.get_user(user_id)
+        liked_card_ids: list = user_info.liked_card_ids
+        disliked_card_ids: list = user_info.disliked_card_ids
+
+        if card_id in liked_card_ids:
+            return BaseResponse(result="Card already liked", error=True)
+        elif card_id in disliked_card_ids:
+            return BaseResponse(result="Card already disliked", error=True)
+        else:
+            return BaseResponse(result="No reactions", error=False)
+
+    def like_card(self, card_id: int, user_id: int) -> BaseResponse:
+        if self.check_user(user_id):
+            user_reaction = self.check_user_reactions(user_id, card_id)
+            if user_reaction.error:
+                return user_reaction
+            update_card_info = self.game_data.find_one_and_update({"card_id": card_id}, 
+                                                                {"$inc": {"count_likes": 1}})
+            if not update_card_info:
+                return BaseResponse(result="Card doesn't exist", error=True)
+            
+            add_card_to_user = self.users_data.update_one({'user_id': user_id},
+                                                          {'$push': {'liked_card_ids': card_id}})
+            if not add_card_to_user:
+                return BaseResponse(result="User doesn't exist", error=True)
+            else:
+                return BaseResponse(result=True, error=False)
+        else:
+            return BaseResponse(result="User doesn't exist", error=True)
+            
+    def dislike_card(self, card_id: int, user_id: int) -> BaseResponse:
+        if self.check_user(user_id):
+            user_reaction = self.check_user_reactions(user_id, card_id)
+            if user_reaction.error:
+                return user_reaction
+            update_card_info = self.game_data.find_one_and_update({"card_id": card_id}, 
+                                                                {"$inc": {"count_dislikes": 1}})
+            if not update_card_info:
+                return BaseResponse(result="Card doesn't exist", error=True)
+            
+            add_card_to_user = self.users_data.update_one({'user_id': user_id},
+                                                          {'$push': {'disliked_card_ids': card_id}})
+            if not add_card_to_user:
+                return BaseResponse(result="User doesn't exist", error=True)
+            else:
+                return BaseResponse(result=True, error=False)
+        else:
+            return BaseResponse(result="User doesn't exist", error=True)
+        
+    def add_comment(self, user_id: int, card_id: int, comment_text: str) -> BaseResponse:
+        if self.check_user(user_id):
+            if self.get_card(card_id):
+                new_comment = Comment(comment_id=self.get_and_update_counter(counter_name="comment"),
+                                    author_id=user_id,
+                                    card_id=card_id,
+                                    comment_text=comment_text,
+                                    creation_date=datetime.now().isoformat())
+                result = self.comments_data.insert_one(new_comment.model_dump())
+                if result:
+                    update_user_comments = self.users_data.find_one_and_update({"user_id": user_id},
+                                                        {"$addToSet": {"comments_ids": new_comment.comment_id}})
+                    if update_user_comments:
+                        return BaseResponse(result=new_comment)
+                    else:
+                        return BaseResponse(result="Difficulty adding comment_id to user", error=True)
+                else:
+                    return BaseResponse(result="Add comment error", error=True)
+            else:
+                return BaseResponse(result="Card doesn't exist", error=True)
+        else:
+            return BaseResponse(result="User doesn't exist", error=True)

app/requirements.txt

@@ -0,0 +1,4 @@
+fastapi==0.115.7
+pymongo==4.10.1
+python-dotenv==1.0.1
+uvicorn==0.34.0

app/schemas/api_schemas.py

@@ -0,0 +1,38 @@
+import typing
+
+from pydantic import BaseModel, NonNegativeInt
+
+
+class BaseResponse(BaseModel):
+    result: typing.Any
+    error: bool = False
+
+class AddUserBody(BaseModel):
+    user_id: NonNegativeInt
+    username: str
+
+    first_name: str
+    last_name: str
+    photo_url: str
+
+class AddCardBody(BaseModel):
+    choice_A: str
+    choice_B: str
+
+    author_id: NonNegativeInt
+
+class SelectChoice(BaseModel):
+    user_id: NonNegativeInt
+    card_id: NonNegativeInt
+
+    choice: typing.Literal["A", "B"]
+
+class ReactionCard(BaseModel):
+    user_id: NonNegativeInt
+    card_id: NonNegativeInt
+
+class AddCommentBody(BaseModel):
+    author_id: NonNegativeInt
+    card_id: NonNegativeInt
+
+    comment_text: str

app/schemas/base_schemas.py

@@ -0,0 +1,48 @@
+from pydantic import BaseModel
+
+class User(BaseModel):
+    user_id: int
+    username: str
+
+    first_name: str
+    last_name: str
+    photo_url: str
+
+    activity: int = 0
+    liked_card_ids: list[int] = list()
+    disliked_card_ids: list[int] = list()
+    comments_ids: list[int] = list()
+
+    registration_date: str
+
+class Visited(BaseModel):
+    user_id: int
+    cards_visited: set[int]
+
+class Card(BaseModel):
+    card_id: int
+
+    choice_A: str
+    choice_B: str
+
+    count_choice_A: int = 0
+    count_choice_B: int = 0
+    count_total: int = 0
+
+    count_likes: int = 0
+    count_dislikes: int = 0
+    comments: list[int] = list()
+
+    author_id: int
+    creation_date: str
+    moderation_date: str = "Not moderated"
+    active_status: bool = False
+
+class Comment(BaseModel):
+    comment_id: int
+
+    author_id: int
+    card_id: int
+    comment_text: str
+
+    creation_date: str

app/tests/test_cards.py

@@ -0,0 +1,186 @@
+import random
+import asyncio
+import pytest
+from httpx import AsyncClient, ASGITransport
+
+from main import app
+from schemas.base_schemas import *
+from schemas.api_schemas import *
+
+
+EXIST_AUTHOR = random.randint(100000000, 1000000000)
+NON_EXIST_CARD_ID = 1000
+
+
+# ---------- /add_card ----------
+
+@pytest.mark.asyncio
+async def test_add_card_valid():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        payload = {
+            "choice_A": "Option A",
+            "choice_B": "Option B",
+            "author_id": EXIST_AUTHOR
+        }
+        response = await client.post("/add_card", json=payload)
+        print(f"\nINPUT: endpoint=/add_card | payload={payload}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code in (200, 201)
+        base_resp = BaseResponse.model_validate(response.json())
+        assert base_resp.error is False
+        card = Card.model_validate(base_resp.result)
+        assert card.choice_A == payload["choice_A"]
+        assert card.choice_B == payload["choice_B"]
+        assert card.author_id == payload["author_id"]
+
+@pytest.mark.asyncio
+async def test_add_card_missing_field():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        payload = {
+            #choice_A
+            "choice_B": "Option B",
+            "author_id": EXIST_AUTHOR
+        }
+        response = await client.post("/add_card", json=payload)
+        print(f"\nINPUT: endpoint=/add_card | payload (missing field)={payload}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_add_card_wrong_type():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        payload = {
+            "choice_A": 123,
+            "choice_B": "Option B",
+            "author_id": EXIST_AUTHOR
+        }
+        response = await client.post("/add_card", json=payload)
+        print(f"\nINPUT: endpoint=/add_card | payload (wrong type)={payload}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_add_card_empty_strings():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        payload = {
+            "choice_A": "",
+            "choice_B": "",
+            "author_id": EXIST_AUTHOR
+        }
+        response = await client.post("/add_card", json=payload)
+        print(f"\nINPUT: endpoint=/add_card | payload (empty strings)={payload}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 400
+
+@pytest.mark.asyncio
+async def test_add_card_long_strings():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        long_str = "A" * 5000  # long string
+        payload = {
+            "choice_A": long_str,
+            "choice_B": long_str,
+            "author_id": EXIST_AUTHOR
+        }
+        response = await client.post("/add_card", json=payload)
+        print(f"\nINPUT: endpoint=/add_card | payload with long strings (length={len(long_str)})\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 400
+
+@pytest.mark.asyncio
+async def test_add_card_negative_author_id():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        payload = {
+            "choice_A": "Option A",
+            "choice_B": "Option B",
+            "author_id": -10 # Negative id
+        }
+        response = await client.post("/add_card", json=payload)
+        print(f"\nINPUT: endpoint=/add_card | payload (negative author_id)={payload}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_add_card_malformed_json():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        malformed_json = '{"choice_A": "Option A", "choice_B": "Option B", "author_id": 123' # broken json
+        response = await client.post(
+            "/add_card",
+            data=malformed_json,
+            headers={"Content-Type": "application/json"}
+        )
+        print(f"\nINPUT: endpoint=/add_card | payload (malformed JSON)={malformed_json}\nOUTPUT: status={response.status_code} | json={response.json() if response.content else 'No JSON'}")
+        assert response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_async_card_creation():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        tasks = []
+        num_cards = 8
+        for i in range(num_cards):
+            payload = {
+                "choice_A": f"Async Option A {i}",
+                "choice_B": f"Async Option B {i}",
+                "author_id": EXIST_AUTHOR
+            }
+            tasks.append(client.post("/add_card", json=payload))
+        responses = await asyncio.gather(*tasks)
+        
+        card_ids = []
+        for idx, response in enumerate(responses):
+            print(f"\nAsync creation {idx}: status={response.status_code}, response={response.json()}")
+            assert response.status_code in (200, 201)
+            base_resp = BaseResponse.model_validate(response.json())
+            assert base_resp.error is False
+            card = Card.model_validate(base_resp.result)
+            card_ids.append(card.card_id)
+            assert card.choice_A == f"Async Option A {idx}"
+            assert card.choice_B == f"Async Option B {idx}"
+            assert card.author_id == EXIST_AUTHOR
+
+        assert len(set(card_ids)) == num_cards
+
+
+# ---------- /get_card ----------
+
+@pytest.mark.asyncio
+async def test_get_card_valid():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        payload = {
+            "choice_A": "GetTest A",
+            "choice_B": "GetTest B",
+            "author_id": EXIST_AUTHOR
+        }
+        create_resp = await client.post("/add_card", json=payload)
+        base_create = BaseResponse.model_validate(create_resp.json())
+        card = Card.model_validate(base_create.result)
+        card_id = card.card_id
+
+        response = await client.get("/get_card", params={"card_id": card_id})
+        print(f"\nINPUT: endpoint=/get_card | params={{'card_id': {card_id}}}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 200
+        base_resp = BaseResponse.model_validate(response.json())
+        assert base_resp.error is False
+        card_from_get = Card.model_validate(base_resp.result)
+        assert card_from_get.card_id == card_id
+
+@pytest.mark.asyncio
+async def test_get_card_nonexistent():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        response = await client.get("/get_card", params={"card_id": NON_EXIST_CARD_ID})
+        print(f"\nINPUT: endpoint=/get_card | params={{'card_id': {NON_EXIST_CARD_ID}}}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 404
+
+@pytest.mark.asyncio
+async def test_get_card_missing_param():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        response = await client.get("/get_card")
+        print(f"\nINPUT: endpoint=/get_card (missing card_id param)\nOUTPUT: status={response.status_code} | json={response.json() if response.content else 'No content'}")
+        assert response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_get_card_wrong_type():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        response = await client.get("/get_card", params={"card_id": "abc"})
+        print(f"\nINPUT: endpoint=/get_card | params={{'card_id': 'abc'}}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_get_card_negative():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        response = await client.get("/get_card", params={"card_id": -10})
+        print(f"\nINPUT: endpoint=/get_card | params={{'card_id': -10}}\nOUTPUT: status={response.status_code} | json={response.json()}")
+        assert response.status_code == 422

app/tests/test_user_info.py

@@ -0,0 +1,154 @@
+import random
+
+import pytest
+
+from main import app
+from schemas.api_schemas import *
+from schemas.base_schemas import *
+
+from httpx import AsyncClient, ASGITransport
+
+
+EXIST_USER = random.randint(100000000, 1000000000) 
+NON_EXIST_USER = random.randint(100000000, 1000000000)
+
+
+
+# TEST ADD USERS UTILS #
+
+@pytest.mark.asyncio
+async def test_add_user_non_full_data():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/add_user"
+        data = {
+            "user_id": EXIST_USER,
+            "username": "TestUsername",
+            }
+        raw_response = await client.post(url=end_point,json=data)
+        print(f"\nINPUT: endpiont={end_point} | params={data}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_add_user_negative_int_id():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/add_user"
+        data = {
+            "user_id": -1,
+            "username": "TestUsername",
+            "first_name": "FName",
+            "last_name": "LName",
+            "photo_url": "http://test.test/photo.jpg"
+            }
+        raw_response = await client.post(url=end_point,json=data)
+        print(f"\nINPUT: endpiont={end_point} | params={data}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 422
+
+@pytest.mark.asyncio
+async def test_add_new_user():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/add_user"
+        data = {
+            "user_id": EXIST_USER,
+            "username": "TestUsername",
+            "first_name": "FName",
+            "last_name": "LName",
+            "photo_url": "http://test.test/photo.jpg"
+            }
+        raw_response = await client.post(url=end_point,json=data)
+        print(f"\nINPUT: endpiont={end_point} | params={data}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 201
+        response = BaseResponse.model_validate(raw_response.json())
+        assert response.error == False
+        assert User.model_validate(response.result)
+
+@pytest.mark.asyncio
+async def test_add_already_exist_user():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/add_user"
+        data = {
+            "user_id": EXIST_USER,
+            "username": "TestUsername",
+            "first_name": "FName",
+            "last_name": "LName",
+            "photo_url": "http://test.test/photo.jpg"
+            }
+        raw_response = await client.post(url=end_point,json=data)
+        print(f"\nINPUT: endpiont={end_point} | params={data}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 409
+        response = BaseResponse.model_validate(raw_response.json())
+        assert response.error == True
+        assert response.result == "User already exist"
+
+
+
+
+# TEST CHECK USERS UTILS #
+
+@pytest.mark.asyncio
+async def test_check_non_exist_user():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/check_user"
+        params = {"user_id": NON_EXIST_USER}
+        raw_response = await client.get(url=end_point, params=params)
+        print(f"\nINPUT: endpiont={end_point} | params={params}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 200
+        response = BaseResponse.model_validate(raw_response.json())
+        assert response.error == False
+        assert response.result == False
+
+@pytest.mark.asyncio
+async def test_check_exist_user():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/check_user"
+        params = {"user_id": EXIST_USER}
+        raw_response = await client.get(url=end_point, params=params)
+        print(f"\nINPUT: endpiont={end_point} | params={params}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 200
+        response = BaseResponse.model_validate(raw_response.json())
+        assert response.error == False
+        assert response.result == True
+
+
+
+
+# TEST GET USERS UTILS #
+
+@pytest.mark.asyncio
+async def test_get_non_exist_user():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/get_user"
+        params = {"user_id": NON_EXIST_USER}
+        raw_response = await client.get(url=end_point, params=params)
+        print(f"\nINPUT: endpiont={end_point} | params={params}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 404
+        response = BaseResponse.model_validate(raw_response.json())
+        assert response.error == True 
+        assert response.result == "User doesn't exist"
+
+@pytest.mark.asyncio
+async def test_get_exist_user():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/get_user"
+        params = {"user_id": EXIST_USER}
+        raw_response = await client.get(url=end_point, params=params)
+        print(f"\nINPUT: endpiont={end_point} | params={params}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 200
+        response = BaseResponse.model_validate(raw_response.json())
+        assert response.error == False 
+        assert User.model_validate(response.result)

app/tests/test_visited_cards.py

@@ -0,0 +1,92 @@
+import random
+import asyncio
+import pytest
+from httpx import AsyncClient, ASGITransport
+
+from main import app
+from schemas.base_schemas import *
+from schemas.api_schemas import *
+
+EXIST_USER = random.randint(100000000, 1000000000)
+EXIST_AUTHOR = random.randint(100000000, 1000000000)
+NO_ACTIVE_CARDS_STATUS = False
+ACTIVE_CARDS_LESS_THAN_TEN = False
+
+# ------------- /add_user ---------------
+
+@pytest.mark.asyncio
+async def test_add_new_user():
+    async with AsyncClient(transport=ASGITransport(app=app),
+                           base_url='http://test') as client:
+        end_point = "/add_user"
+        data = {
+            "user_id": EXIST_USER,
+            "username": "TestUsername",
+            "first_name": "FName",
+            "last_name": "LName",
+            "photo_url": "http://test.test/photo.jpg"
+            }
+        raw_response = await client.post(url=end_point,json=data)
+        print(f"\nINPUT: endpiont={end_point} | params={data}\nOUTPUT: status={raw_response.status_code} | json={raw_response.json()}")
+
+        assert raw_response.status_code == 201
+        response = BaseResponse.model_validate(raw_response.json())
+        assert response.error == False
+        assert User.model_validate(response.result)
+
+# ---------- /get_random_cards ----------
+
+@pytest.mark.asyncio
+async def test_get_random_cards_valid():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        params = {"user_id": EXIST_USER}
+        response = await client.get("/get_random_cards", params=params)
+        print(f"\nINPUT: endpoint=/get_random_cards\nOUTPUT: status={response.status_code} | json={response.json()}")
+        if response.status_code == 404 and BaseResponse.model_validate(response.json()).result == "No active cards":
+            global NO_ACTIVE_CARDS_STATUS
+            NO_ACTIVE_CARDS_STATUS = True
+            pytest.skip(reason="No active cards in MongoDB")
+        else:
+            assert response.status_code == 200
+            result = response.json().get("result")
+            assert isinstance(result, list)
+            if len(result) == 10:
+                for card in result:
+                    assert "choice_A" in card
+                    assert "choice_B" in card
+                    assert "author_id" in card
+                    assert "card_id" in card
+            else:
+                global ACTIVE_CARDS_LESS_THAN_TEN
+                ACTIVE_CARDS_LESS_THAN_TEN = True
+                pytest.skip(reason="The number of active cards is less than 10 in MongoDB")
+
+@pytest.mark.asyncio
+async def test_get_random_cards_randomness():
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        params = {"user_id": EXIST_USER}
+        response1 = await client.get("/get_random_cards", params=params)
+        response2 = await client.get("/get_random_cards", params=params)
+        result1 = response1.json().get("result")
+        result2 = response2.json().get("result")
+        print(f"\nINPUT: endpoint=/get_random_cards (двойной вызов)\nOUTPUT 1: {result1}\nOUTPUT 2: {result2}")
+        if len(result1) == 10 and len(result2) == 10:
+            assert result1 != result2
+
+@pytest.mark.asyncio
+async def test_get_random_cards_parallel_requests():
+    if NO_ACTIVE_CARDS_STATUS:
+        pytest.skip(reason="No active cards in MongoDB")
+    elif ACTIVE_CARDS_LESS_THAN_TEN:
+        pytest.skip(reason="The number of active cards is less than 10 in MongoDB")
+    else:
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            params = {"user_id": EXIST_USER}
+            tasks = [client.get("/get_random_cards", params=params) for _ in range(5)]
+            responses = await asyncio.gather(*tasks)
+            for resp in responses:
+                print(f"\nParallel call: status={resp.status_code} | json={resp.json()}")
+                assert resp.status_code == 200
+                result = resp.json().get("result")
+                assert isinstance(result, list)
+                assert len(result) == 10

app/tools/_add_base_cards.py

@@ -0,0 +1,72 @@
+import argparse
+import sys
+import json
+from datetime import datetime
+
+sys.path.append('..')
+from mongo_worker import MongoWorker
+from schemas.base_schemas import Card
+
+
+def create_cards(num_cards=10, author_id=1):
+    cards_list = []
+    for card_id in range(1, num_cards + 1):
+        print(f"Creating Card {card_id}")
+        card = Card(
+            card_id=card_id,
+            choice_A=input("Choice A: "),
+            choice_B=input("Choice B: "),
+            author_id=author_id,
+            creation_date=datetime.now().isoformat(),
+            moderation_date=datetime.now().isoformat(),
+            active_status=True
+        )
+        cards_list.append(card)
+    return cards_list
+
+def read_json(json_file):
+    try:
+        with open(json_file, 'r', encoding='utf-8') as f:
+            data = json.load(f)
+        return [Card(**card) for card in data]
+    except Exception as e:
+        print(f"Error reading JSON file: {e}")
+        return []
+
+def write_json(cards_list, json_file):
+    try:
+        with open(json_file, 'w', encoding='utf-8') as f:
+            json.dump([card.model_dump() for card in cards_list], f, ensure_ascii=False, indent=4)
+        print(f"Successfully saved {len(cards_list)} cards to {json_file}")
+    except Exception as e:
+        print(f"Error writing to JSON file: {e}")
+
+def add_cards_to_mongodb(cards_list):
+    mongo = MongoWorker()
+    for card in cards_list:
+        mongo.add_card_by_base_model(card)
+    print(f"Successfully added {len(cards_list)} cards to MongoDB")
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-a', '--action', type=int, required=True, choices=[0, 1, 2],
+                        help="0 - Manual input & save to MongoDB, 1 - Manual input & save to JSON, 2 - Read JSON & save to MongoDB")
+    parser.add_argument('-f', '--file', type=str, default="cards.json", help="JSON file name for reading/writing")
+    parser.add_argument('-n', '--num', type=int, default=10, help="Number of cards to create")
+    parser.add_argument('-u', '--user', type=int, default=1, help="Author ID")
+    
+    args = parser.parse_args()
+    
+    if args.action == 0:
+        cards = create_cards(args.num, args.user)
+        add_cards_to_mongodb(cards)
+    elif args.action == 1:
+        cards = create_cards(args.num, args.user)
+        write_json(cards, args.file)
+    elif args.action == 2:
+        cards = read_json(args.file)
+        if cards:
+            add_cards_to_mongodb(cards)
+        else:
+            print("No valid cards found in JSON file.")

app/tools/base_moderation.py

@@ -0,0 +1,24 @@
+import re
+
+from tools.data.dirty_words import dirty_words_set
+
+def is_not_empty(text: str) -> bool:
+    """Checks that the text is not empty."""
+    return bool(text.strip())
+
+def has_no_links(text: str) -> bool:
+    """Checks that there are no links in the text."""
+    url_pattern = re.compile(r'https?://\S+|www\.\S+')
+    return not bool(url_pattern.search(text))
+
+def has_no_dirty_words(text: str) -> bool:
+    """Checks that there are no forbidden words in the text."""
+    words = set(re.findall(r'\w+', text.lower()))
+    return not bool(words & dirty_words_set)
+
+def text_lenght(text: str) -> bool:
+    """Check max text lenght"""
+    return len(text) <= 150 # TODO: update in future
+
+def moderate_text(text: str) -> bool:
+    return is_not_empty(text) and has_no_links(text) and has_no_dirty_words(text) and text_lenght(text)

app/tools/data/base_cards.json

@@ -0,0 +1,152 @@
+[
+    {
+        "card_id": 1,
+        "choice_A": "Котики",
+        "choice_B": "Собачки",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:56:05.290110",
+        "moderation_date": "2025-03-04T16:56:05.290143",
+        "active_status": true
+    },
+    {
+        "card_id": 2,
+        "choice_A": "Чай",
+        "choice_B": "Кофе",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:56:11.108762",
+        "moderation_date": "2025-03-04T16:56:11.108793",
+        "active_status": true
+    },
+    {
+        "card_id": 3,
+        "choice_A": "Отпуск в горах",
+        "choice_B": "Отпуск на море",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:56:25.062542",
+        "moderation_date": "2025-03-04T16:56:25.062586",
+        "active_status": true
+    },
+    {
+        "card_id": 4,
+        "choice_A": "День",
+        "choice_B": "Ночь",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:56:34.148692",
+        "moderation_date": "2025-03-04T16:56:34.148725",
+        "active_status": true
+    },
+    {
+        "card_id": 5,
+        "choice_A": "Работать в офисе",
+        "choice_B": "Работать удалённо",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:57:00.723472",
+        "moderation_date": "2025-03-04T16:57:00.723518",
+        "active_status": true
+    },
+    {
+        "card_id": 6,
+        "choice_A": "Заниматься спортом",
+        "choice_B": "Играть в видеоигры",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:57:31.524721",
+        "moderation_date": "2025-03-04T16:57:31.524754",
+        "active_status": true
+    },
+    {
+        "card_id": 7,
+        "choice_A": "Гулять",
+        "choice_B": "Сидеть дома",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:57:52.022380",
+        "moderation_date": "2025-03-04T16:57:52.022413",
+        "active_status": true
+    },
+    {
+        "card_id": 8,
+        "choice_A": "Посмотреть фильм",
+        "choice_B": "Почитать книжку",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:58:15.032749",
+        "moderation_date": "2025-03-04T16:58:15.032762",
+        "active_status": true
+    },
+    {
+        "card_id": 9,
+        "choice_A": "Зима",
+        "choice_B": "Лето",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:58:24.800416",
+        "moderation_date": "2025-03-04T16:58:24.800450",
+        "active_status": true
+    },
+    {
+        "card_id": 10,
+        "choice_A": "Лучший друг/подруга",
+        "choice_B": "Любимый человек",
+        "count_choice_A": 0,
+        "count_choice_B": 0,
+        "count_total": 0,
+        "count_likes": 0,
+        "count_dislikes": 0,
+        "comments": [],
+        "author_id": 1,
+        "creation_date": "2025-03-04T16:59:05.265795",
+        "moderation_date": "2025-03-04T16:59:05.265829",
+        "active_status": true
+    }
+]

docker-compose.yml

@@ -0,0 +1,33 @@
+version: '3.8'
+
+services:
+  mongodb:
+    image: mongo:latest
+    container_name: tort-mongodb
+    restart: always
+    network_mode: bridge
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: ${MONGO_USER}
+      MONGO_INITDB_ROOT_PASSWORD: ${MONGO_PASS}
+    ports:
+      - "127.0.0.1:${MONGO_PORT}:27017"
+    healthcheck:
+      test: [ "CMD", "mongosh", "--username", "${MONGO_USER}", "--password", "${MONGO_PASS}", "--eval", "db.runCommand({ ping: 1 })" ]
+      interval: 10s
+      timeout: 5s
+      retries: 2
+
+  backend:
+    build:
+      context: ./app
+    image: tort-backend:latest
+    depends_on:
+      mongodb:
+        condition: service_healthy
+    container_name: tort-backend
+    network_mode: "host"
+    environment:
+      MONGO_HOST: ${MONGO_HOST}
+      MONGO_PORT: ${MONGO_PORT}
+      MONGO_USER: ${MONGO_USER}
+      MONGO_PASS: ${MONGO_PASS}

frontend/package.json

@@ -0,0 +1,39 @@
+{
+  "name": "frontend",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "cra-template": "1.2.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "react-scripts": "5.0.1"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
+  "proxy": "http://localhost:5000",
+  "devDependencies": {
+    "web-vitals": "^4.2.4"
+  }
+}

frontend/public/index.html

@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html lang="ru">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, viewport-fit=cover" />
+    <meta name="theme-color" content="#070711" />
+    <meta name="description" content="This OR That — выбирай один из двух вариантов и смотри, что выбрали другие!" />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+
+    <!-- Telegram WebApp SDK -->
+    <script src="https://telegram.org/js/telegram-web-app.js"></script>
+
+    <title>This OR That</title>
+  </head>
+  <body>
+    <noscript>Для работы приложения необходим JavaScript.</noscript>
+    <div id="root"></div>
+  </body>
+</html>

frontend/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

frontend/public/robots.txt

@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

frontend/src/App.css

@@ -0,0 +1,54 @@
+/* ---------- App Layout ---------- */
+
+.app-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: var(--space-sm) var(--space-md);
+  height: 48px;
+  flex-shrink: 0;
+}
+
+.app-logo {
+  font-family: var(--font-display);
+  font-size: 16px;
+  font-weight: 700;
+  color: var(--color-text);
+  letter-spacing: -0.3px;
+}
+
+.app-logo-or {
+  display: inline-block;
+  margin: 0 3px;
+  padding: 1px 6px;
+  background: linear-gradient(135deg, var(--color-card-a-to), var(--color-card-b-to));
+  border-radius: 6px;
+  font-size: 12px;
+  vertical-align: middle;
+}
+
+/* Hamburger menu */
+.menu-toggle {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  gap: 4px;
+  width: 36px;
+  height: 36px;
+  padding: 8px;
+  border-radius: var(--radius-sm);
+  transition: background var(--duration-fast) var(--ease-smooth);
+}
+
+.menu-toggle:active {
+  background: rgba(255, 255, 255, 0.06);
+}
+
+.menu-toggle-line {
+  display: block;
+  width: 100%;
+  height: 2px;
+  background: var(--color-text);
+  border-radius: 1px;
+  transition: transform var(--duration-normal) var(--ease-smooth);
+}

frontend/src/App.js

@@ -0,0 +1,60 @@
+import React from 'react';
+import { AppProvider, useApp } from './context/AppContext';
+import LoadingScreen from './components/common/LoadingScreen';
+import Toast from './components/common/Toast';
+import CardPair from './components/CardPair/CardPair';
+import BottomBar from './components/BottomBar/BottomBar';
+import CommentsPanel from './components/Comments/CommentsPanel';
+import MenuPanel from './components/Menu/MenuPanel';
+import './App.css';
+
+function AppContent() {
+  const { isLoading, error, openMenu, toast } = useApp();
+
+  if (isLoading) {
+    return <LoadingScreen />;
+  }
+
+  if (error && !isLoading) {
+    return <LoadingScreen error={error} />;
+  }
+
+  return (
+    <div className="app">
+      {/* Header with menu button */}
+      <header className="app-header">
+        <div className="app-logo">
+          this<span className="app-logo-or">OR</span>that
+        </div>
+        <button className="menu-toggle" onClick={openMenu} aria-label="Меню">
+          <span className="menu-toggle-line" />
+          <span className="menu-toggle-line" />
+          <span className="menu-toggle-line" />
+        </button>
+      </header>
+
+      {/* Main content — card pair */}
+      <CardPair />
+
+      {/* Bottom bar — reactions */}
+      <BottomBar />
+
+      {/* Panels */}
+      <CommentsPanel />
+      <MenuPanel />
+
+      {/* Toast notifications */}
+      <Toast message={toast} />
+    </div>
+  );
+}
+
+function App() {
+  return (
+    <AppProvider>
+      <AppContent />
+    </AppProvider>
+  );
+}
+
+export default App;

frontend/src/App.test.js

@@ -0,0 +1,8 @@
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

frontend/src/components/BottomBar/BottomBar.css

@@ -0,0 +1,74 @@
+.bottom-bar {
+  display: flex;
+  align-items: center;
+  justify-content: space-around;
+  height: var(--bar-height);
+  padding: 0 var(--space-lg);
+  background: var(--color-bg-elevated);
+  border-top: 1px solid rgba(255, 255, 255, 0.06);
+  flex-shrink: 0;
+}
+
+.bar-btn {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 2px;
+  padding: var(--space-sm) var(--space-md);
+  border-radius: var(--radius-sm);
+  transition: color var(--duration-fast) var(--ease-smooth),
+              transform var(--duration-fast) var(--ease-smooth);
+  color: var(--color-muted);
+}
+
+.bar-btn:active {
+  transform: scale(0.92);
+}
+
+.bar-btn--disabled {
+  opacity: 0.4;
+  pointer-events: none;
+}
+
+.bar-btn--disabled.bar-btn--active {
+  opacity: 1;
+  pointer-events: none;
+}
+
+/* Active states */
+.bar-btn--like.bar-btn--active {
+  color: var(--color-like);
+  animation: popIn 300ms var(--ease-spring);
+}
+
+.bar-btn--dislike.bar-btn--active {
+  color: var(--color-dislike);
+  animation: popIn 300ms var(--ease-spring);
+}
+
+.bar-btn--comments {
+  color: var(--color-muted);
+}
+
+.bar-btn--comments:not(.bar-btn--disabled) {
+  opacity: 1;
+  pointer-events: auto;
+}
+
+.bar-icon {
+  width: 22px;
+  height: 22px;
+}
+
+.bar-count {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  font-weight: 500;
+  line-height: 1;
+}
+
+@keyframes popIn {
+  0% { transform: scale(1); }
+  40% { transform: scale(1.25); }
+  100% { transform: scale(1); }
+}

frontend/src/components/BottomBar/BottomBar.jsx

@@ -0,0 +1,86 @@
+import React, { useState } from 'react';
+import { useApp } from '../../context/AppContext';
+import './BottomBar.css';
+
+export default function BottomBar() {
+  const { currentCard, chosenCard, likeCard, dislikeCard, setIsCommentsOpen, user } = useApp();
+  const [reactionState, setReactionState] = useState(null); // 'liked' | 'disliked' | null
+
+  const isRevealed = chosenCard !== null;
+
+  // Check if user already reacted to this card
+  const alreadyLiked = user?.liked_card_ids?.includes(currentCard?.card_id);
+  const alreadyDisliked = user?.disliked_card_ids?.includes(currentCard?.card_id);
+  const currentReaction = reactionState || (alreadyLiked ? 'liked' : alreadyDisliked ? 'disliked' : null);
+
+  const handleLike = async () => {
+    if (!isRevealed || currentReaction) return;
+    const result = await likeCard();
+    if (result && !result.error) {
+      setReactionState('liked');
+    }
+  };
+
+  const handleDislike = async () => {
+    if (!isRevealed || currentReaction) return;
+    const result = await dislikeCard();
+    if (result && !result.error) {
+      setReactionState('disliked');
+    }
+  };
+
+  const handleComments = () => {
+    setIsCommentsOpen(true);
+  };
+
+  // Reset reaction state when card changes
+  React.useEffect(() => {
+    setReactionState(null);
+  }, [currentCard?.card_id]);
+
+  const likes = (currentCard?.count_likes || 0) + (reactionState === 'liked' ? 1 : 0);
+  const dislikes = (currentCard?.count_dislikes || 0) + (reactionState === 'disliked' ? 1 : 0);
+
+  return (
+    <div className="bottom-bar">
+      <button
+        className={`bar-btn bar-btn--dislike ${currentReaction === 'disliked' ? 'bar-btn--active' : ''} ${!isRevealed || currentReaction ? 'bar-btn--disabled' : ''}`}
+        onClick={handleDislike}
+        aria-label="Дизлайк"
+      >
+        <svg className="bar-icon" viewBox="0 0 24 24" fill="currentColor" style={{ transform: 'rotate(180deg)' }}>
+          <path d="M17 4h2a2 2 0 012 2v7a2 2 0 01-2 2h-2.29a1 1 0 00-.71.3l-3.28 3.28a1 1 0 01-1.72-.7V15a1 1 0 00-1-1H7a2 2 0 01-2-2V6a2 2 0 012-2h10z" />
+        </svg>
+        <span className="bar-count">{formatCount(dislikes)}</span>
+      </button>
+
+      <button
+        className="bar-btn bar-btn--comments"
+        onClick={handleComments}
+        aria-label="Комментарии"
+      >
+        <svg className="bar-icon" viewBox="0 0 24 24" fill="currentColor">
+          <path d="M21 15a2 2 0 01-2 2H7l-4 4V5a2 2 0 012-2h14a2 2 0 012 2v10z" />
+        </svg>
+        <span className="bar-count">{formatCount(currentCard?.comments?.length || 0)}</span>
+      </button>
+
+      <button
+        className={`bar-btn bar-btn--like ${currentReaction === 'liked' ? 'bar-btn--active' : ''} ${!isRevealed || currentReaction ? 'bar-btn--disabled' : ''}`}
+        onClick={handleLike}
+        aria-label="Лайк"
+      >
+        <svg className="bar-icon" viewBox="0 0 24 24" fill="currentColor">
+          <path d="M17 4h2a2 2 0 012 2v7a2 2 0 01-2 2h-2.29a1 1 0 00-.71.3l-3.28 3.28a1 1 0 01-1.72-.7V15a1 1 0 00-1-1H7a2 2 0 01-2-2V6a2 2 0 012-2h10z" />
+        </svg>
+        <span className="bar-count">{formatCount(likes)}</span>
+      </button>
+    </div>
+  );
+}
+
+function formatCount(n) {
+  if (n >= 1_000_000) return (n / 1_000_000).toFixed(1).replace(/\.0$/, '') + 'M';
+  if (n >= 1_000) return (n / 1_000).toFixed(1).replace(/\.0$/, '') + 'K';
+  return String(n);
+}

frontend/src/components/CardPair/Card.css

@@ -0,0 +1,112 @@
+.card {
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: var(--space-lg);
+  border-radius: var(--radius-card);
+  cursor: pointer;
+  transition: flex-grow var(--duration-card) var(--ease-spring),
+              opacity 400ms var(--ease-smooth),
+              filter  400ms var(--ease-smooth);
+  overflow: hidden;
+  min-height: 0;
+}
+
+/* Card A — Deep Violet gradient */
+.card--a {
+  background: linear-gradient(160deg, var(--color-card-a-from), var(--color-card-a-to));
+}
+
+/* Card B — Electric Blue gradient */
+.card--b {
+  background: linear-gradient(160deg, var(--color-card-b-from), var(--color-card-b-to));
+}
+
+/* Tap feedback */
+.card:active {
+  transform: scale(0.98);
+  transition: transform 80ms ease;
+}
+
+/* After choice — faded (not chosen) */
+.card--faded {
+  opacity: 0.65;
+  filter: brightness(0.8) saturate(0.85);
+}
+
+/* After choice — chosen */
+.card--chosen {
+  opacity: 1;
+}
+
+/* Tap hint on chosen card */
+.card--tap-next {
+  cursor: pointer;
+}
+
+/* ---------- Text ---------- */
+.card-text {
+  font-family: var(--font-display);
+  font-size: 18px;
+  font-weight: 600;
+  color: var(--color-text);
+  text-align: center;
+  line-height: 1.3;
+  word-break: break-word;
+  max-width: 280px;
+}
+
+/* ---------- Stats ---------- */
+.card-stats {
+  position: absolute;
+  bottom: var(--space-md);
+  right: var(--space-md);
+  text-align: right;
+  animation: statsReveal 500ms var(--ease-spring) forwards;
+}
+
+.card-percent {
+  display: block;
+  font-family: var(--font-mono);
+  font-size: 28px;
+  font-weight: 700;
+  line-height: 1;
+}
+
+.card--a .card-percent { color: var(--color-stat-a); }
+.card--b .card-percent { color: var(--color-stat-b); }
+
+.card-count {
+  display: block;
+  font-family: var(--font-mono);
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--color-muted);
+  margin-top: 2px;
+}
+
+/* ---------- Hint ---------- */
+.card-hint {
+  position: absolute;
+  bottom: var(--space-sm);
+  left: 50%;
+  transform: translateX(-50%);
+  font-size: 11px;
+  color: var(--color-muted);
+  opacity: 0;
+  animation: hintFadeIn 600ms 800ms var(--ease-smooth) forwards;
+  white-space: nowrap;
+}
+
+/* ---------- Animations ---------- */
+@keyframes statsReveal {
+  from { opacity: 0; transform: translateY(8px); }
+  to   { opacity: 1; transform: translateY(0); }
+}
+
+@keyframes hintFadeIn {
+  from { opacity: 0; }
+  to   { opacity: 0.6; }
+}

frontend/src/components/CardPair/Card.jsx

@@ -0,0 +1,34 @@
+import React from 'react';
+import './Card.css';
+
+export default function Card({ label, type, chosen, isChosen, percent, count, onClick }) {
+  const isRevealed = chosen !== null;
+  const isThis = chosen === type;
+  const isFaded = isRevealed && !isThis;
+
+  const cardClass = [
+    'card',
+    `card--${type.toLowerCase()}`,
+    isRevealed ? 'card--revealed' : '',
+    isThis ? 'card--chosen' : '',
+    isFaded ? 'card--faded' : '',
+    isChosen ? 'card--tap-next' : '',
+  ].filter(Boolean).join(' ');
+
+  return (
+    <button className={cardClass} onClick={onClick} aria-label={label}>
+      <span className="card-text">{label}</span>
+      {isRevealed && (
+        <div className="card-stats">
+          <span className="card-percent">{percent}%</span>
+          <span className="card-count">{count}</span>
+        </div>
+      )}
+      {isChosen && isRevealed && (
+        <div className="card-hint">
+          нажми чтобы продолжить
+        </div>
+      )}
+    </button>
+  );
+}

frontend/src/components/CardPair/CardPair.css

@@ -0,0 +1,82 @@
+.card-pair {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  padding: var(--space-md);
+  padding-bottom: var(--space-sm);
+  min-height: 0;
+}
+
+.card-pair-inner {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  position: relative;
+  min-height: 0;
+}
+
+.card-wrapper {
+  display: flex;
+  min-height: 0;
+  transition: flex-grow var(--duration-card) var(--ease-spring);
+}
+
+.card-wrapper .card {
+  flex: 1;
+  width: 100%;
+}
+
+/* Empty state */
+.card-pair--empty {
+  align-items: center;
+  justify-content: center;
+}
+
+.empty-content {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-xl);
+  width: 100%;
+  max-width: 320px;
+  animation: hintFadeIn 600ms var(--ease-smooth);
+}
+
+.card-pair-empty-text {
+  font-family: var(--font-display);
+  font-size: 20px;
+  color: var(--color-text);
+  text-align: center;
+}
+
+.empty-actions {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+}
+
+.empty-btn {
+  width: 100%;
+  padding: var(--space-md);
+  border-radius: var(--radius-sm);
+  background: var(--glass-bg);
+  border: 1px solid var(--glass-border);
+  font-size: 15px;
+  font-weight: 500;
+  color: var(--color-text);
+  transition: all var(--duration-fast) var(--ease-smooth);
+}
+
+.empty-btn:active {
+  background: rgba(255, 255, 255, 0.12);
+}
+
+.empty-btn--primary {
+  background: linear-gradient(135deg, var(--color-card-a-to), var(--color-card-b-to));
+  border-color: transparent;
+  font-weight: 600;
+}
+
+.empty-btn--primary:active {
+  transform: scale(0.97);
+}

frontend/src/components/CardPair/CardPair.jsx

@@ -0,0 +1,99 @@
+import React from 'react';
+import Card from './Card';
+import OrBadge from './OrBadge';
+import { useApp } from '../../context/AppContext';
+import './CardPair.css';
+
+export default function CardPair() {
+  const { currentCard, chosenCard, chooseCard, openMenu, setMenuScreen } = useApp();
+
+  if (!currentCard) {
+    return (
+      <div className="card-pair card-pair--empty">
+        <div className="empty-content">
+          <p className="card-pair-empty-text">Карточки закончились!</p>
+          <div className="empty-actions">
+            <button className="empty-btn empty-btn--primary" onClick={() => { openMenu(); setMenuScreen('create'); }}>
+              Создать карточку
+            </button>
+            <button className="empty-btn" onClick={() => { openMenu(); setMenuScreen('about'); }}>
+              О проекте
+            </button>
+            <button className="empty-btn" onClick={() => window.open('https://boosty.to/pseudodev/donate', '_blank')}>
+              Поддержать проект
+            </button>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  // Calculate percentages
+  const total = currentCard.count_choice_A + currentCard.count_choice_B;
+  let percentA = 50;
+  let percentB = 50;
+
+  if (chosenCard) {
+    // Add the current user's vote to the count for display
+    const votesA = currentCard.count_choice_A + (chosenCard === 'A' ? 1 : 0);
+    const votesB = currentCard.count_choice_B + (chosenCard === 'B' ? 1 : 0);
+    const newTotal = votesA + votesB;
+    if (newTotal > 0) {
+      percentA = Math.round((votesA / newTotal) * 100);
+      percentB = 100 - percentA;
+    }
+
+    // Clamp to 75/25 max for readability
+    if (percentA > 75) { percentA = 75; percentB = 25; }
+    if (percentB > 75) { percentB = 75; percentA = 25; }
+  }
+
+  // flex-grow values for animation
+  const growA = chosenCard ? percentA : 50;
+  const growB = chosenCard ? percentB : 50;
+
+  // Actual percentages for display (unclamped)
+  let displayPercentA = 50;
+  let displayPercentB = 50;
+  if (chosenCard && total >= 0) {
+    const votesA = currentCard.count_choice_A + (chosenCard === 'A' ? 1 : 0);
+    const votesB = currentCard.count_choice_B + (chosenCard === 'B' ? 1 : 0);
+    const newTotal = votesA + votesB;
+    if (newTotal > 0) {
+      displayPercentA = Math.round((votesA / newTotal) * 100);
+      displayPercentB = 100 - displayPercentA;
+    }
+  }
+
+  return (
+    <div className="card-pair">
+      <div className="card-pair-inner">
+        <div className="card-wrapper" style={{ flexGrow: growA }}>
+          <Card
+            label={currentCard.choice_A}
+            type="A"
+            chosen={chosenCard}
+            isChosen={chosenCard === 'A'}
+            percent={displayPercentA}
+            count={currentCard.count_choice_A + (chosenCard === 'A' ? 1 : 0)}
+            onClick={() => chooseCard('A')}
+          />
+        </div>
+
+        <OrBadge visible={!chosenCard} />
+
+        <div className="card-wrapper" style={{ flexGrow: growB }}>
+          <Card
+            label={currentCard.choice_B}
+            type="B"
+            chosen={chosenCard}
+            isChosen={chosenCard === 'B'}
+            percent={displayPercentB}
+            count={currentCard.count_choice_B + (chosenCard === 'B' ? 1 : 0)}
+            onClick={() => chooseCard('B')}
+          />
+        </div>
+      </div>
+    </div>
+  );
+}

frontend/src/components/CardPair/OrBadge.css

@@ -0,0 +1,33 @@
+.or-badge {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  z-index: 10;
+  transition: opacity var(--duration-normal) var(--ease-smooth),
+              transform var(--duration-card) var(--ease-spring);
+}
+
+.or-badge--hidden {
+  opacity: 0;
+  transform: translate(-50%, -50%) scale(0.7);
+  pointer-events: none;
+}
+
+.or-badge-text {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 56px;
+  height: 56px;
+  border-radius: 50%;
+  background: var(--glass-bg);
+  backdrop-filter: blur(var(--glass-blur));
+  -webkit-backdrop-filter: blur(var(--glass-blur));
+  border: 1px solid var(--glass-border);
+  font-family: var(--font-display);
+  font-size: 14px;
+  font-weight: 700;
+  color: var(--color-text);
+  letter-spacing: 0.5px;
+}

frontend/src/components/CardPair/OrBadge.jsx

@@ -0,0 +1,10 @@
+import React from 'react';
+import './OrBadge.css';
+
+export default function OrBadge({ visible }) {
+  return (
+    <div className={`or-badge ${visible ? '' : 'or-badge--hidden'}`}>
+      <span className="or-badge-text">ИЛИ</span>
+    </div>
+  );
+}

frontend/src/components/Comments/CommentItem.css

@@ -0,0 +1,66 @@
+.comment-item {
+  display: flex;
+  gap: var(--space-md);
+  padding: var(--space-md) 0;
+}
+
+.comment-item + .comment-item {
+  border-top: 1px solid rgba(255, 255, 255, 0.06);
+}
+
+.comment-avatar {
+  flex-shrink: 0;
+  width: 40px;
+  height: 40px;
+  border-radius: 50%;
+  overflow: hidden;
+}
+
+.comment-avatar-img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+
+.comment-avatar-fallback {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 100%;
+  height: 100%;
+  background: linear-gradient(135deg, var(--color-card-a-to), var(--color-card-b-to));
+  font-family: var(--font-display);
+  font-size: 16px;
+  font-weight: 700;
+  color: var(--color-text);
+}
+
+.comment-body {
+  flex: 1;
+  min-width: 0;
+}
+
+.comment-header {
+  display: flex;
+  align-items: baseline;
+  gap: var(--space-sm);
+  margin-bottom: 4px;
+}
+
+.comment-author {
+  font-weight: 600;
+  font-size: 14px;
+  color: var(--color-stat-a);
+}
+
+.comment-date {
+  font-size: 12px;
+  color: var(--color-muted);
+}
+
+.comment-text {
+  font-size: 14px;
+  line-height: 1.45;
+  color: var(--color-text);
+  word-break: break-word;
+}

frontend/src/components/Comments/CommentItem.jsx

@@ -0,0 +1,34 @@
+import React from 'react';
+import './CommentItem.css';
+
+export default function CommentItem({ comment, author }) {
+  const displayName = author?.username || author?.first_name || 'Аноним';
+  const date = comment.creation_date
+    ? new Date(comment.creation_date).toLocaleDateString('ru-RU', {
+        day: '2-digit',
+        month: '2-digit',
+        year: 'numeric',
+      })
+    : '';
+
+  return (
+    <div className="comment-item">
+      <div className="comment-avatar">
+        {author?.photo_url ? (
+          <img src={author.photo_url} alt="" className="comment-avatar-img" />
+        ) : (
+          <span className="comment-avatar-fallback">
+            {displayName[0]?.toUpperCase() || '?'}
+          </span>
+        )}
+      </div>
+      <div className="comment-body">
+        <div className="comment-header">
+          <span className="comment-author">{displayName}</span>
+          <span className="comment-date">{date}</span>
+        </div>
+        <p className="comment-text">{comment.comment_text || comment.commet_text}</p>
+      </div>
+    </div>
+  );
+}

frontend/src/components/Comments/CommentsPanel.css

@@ -0,0 +1,127 @@
+.comments-panel {
+  position: fixed;
+  inset: 0;
+  z-index: 60;
+  display: flex;
+  flex-direction: column;
+  background: var(--color-bg);
+  transform: translateY(100%);
+  transition: transform var(--duration-normal) var(--ease-smooth);
+}
+
+.comments-panel--open {
+  transform: translateY(0);
+}
+
+/* Header */
+.comments-header {
+  display: flex;
+  align-items: center;
+  gap: var(--space-md);
+  padding: var(--space-md) var(--space-lg);
+  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
+  flex-shrink: 0;
+}
+
+.comments-close {
+  font-size: 20px;
+  padding: var(--space-xs);
+  color: var(--color-muted);
+  transition: color var(--duration-fast) var(--ease-smooth);
+}
+
+.comments-close:hover {
+  color: var(--color-text);
+}
+
+.comments-title {
+  font-family: var(--font-display);
+  font-size: 18px;
+  font-weight: 600;
+}
+
+/* List */
+.comments-list {
+  flex: 1;
+  overflow-y: auto;
+  padding: 0 var(--space-lg);
+}
+
+.comments-placeholder {
+  padding: var(--space-xl);
+  text-align: center;
+  color: var(--color-muted);
+  font-size: 14px;
+}
+
+.comments-empty {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  height: 100%;
+  gap: var(--space-sm);
+}
+
+.comments-empty-text {
+  font-family: var(--font-display);
+  font-size: 16px;
+  color: var(--color-muted);
+}
+
+.comments-empty-sub {
+  font-size: 13px;
+  color: var(--color-muted);
+  opacity: 0.6;
+}
+
+/* Input area */
+.comments-input-area {
+  display: flex;
+  align-items: flex-end;
+  gap: var(--space-sm);
+  padding: var(--space-md) var(--space-lg);
+  border-top: 1px solid rgba(255, 255, 255, 0.06);
+  background: var(--color-bg-elevated);
+  flex-shrink: 0;
+}
+
+.comments-input {
+  flex: 1;
+  resize: none;
+  padding: var(--space-sm) var(--space-md);
+  background: var(--glass-bg);
+  border: 1px solid var(--glass-border);
+  border-radius: var(--radius-sm);
+  color: var(--color-text);
+  font-size: 14px;
+  line-height: 1.4;
+  min-height: 40px;
+  max-height: 100px;
+}
+
+.comments-input::placeholder {
+  color: var(--color-muted);
+}
+
+.comments-send {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 40px;
+  height: 40px;
+  border-radius: 50%;
+  background: var(--glass-bg);
+  color: var(--color-muted);
+  transition: all var(--duration-fast) var(--ease-smooth);
+  flex-shrink: 0;
+}
+
+.comments-send--active {
+  background: var(--color-like);
+  color: var(--color-text);
+}
+
+.comments-send:disabled {
+  cursor: default;
+}

frontend/src/components/Comments/CommentsPanel.jsx

@@ -0,0 +1,136 @@
+import React, { useState, useEffect, useRef } from 'react';
+import { useApp } from '../../context/AppContext';
+import { showBackButton } from '../../services/auth';
+import { api } from '../../services/api';
+import { currentUser } from '../../services/auth';
+import CommentItem from './CommentItem';
+import './CommentsPanel.css';
+
+export default function CommentsPanel() {
+  const { isCommentsOpen, setIsCommentsOpen, currentCard, showToast } = useApp();
+  const [comments, setComments] = useState([]);
+  const [isLoading, setIsLoading] = useState(false);
+  const [newComment, setNewComment] = useState('');
+  const [isSending, setIsSending] = useState(false);
+  const listRef = useRef(null);
+
+  // Telegram BackButton
+  useEffect(() => {
+    if (isCommentsOpen) {
+      const cleanup = showBackButton(() => setIsCommentsOpen(false));
+      return cleanup;
+    }
+  }, [isCommentsOpen, setIsCommentsOpen]);
+
+  // Load comments when panel opens
+  useEffect(() => {
+    if (isCommentsOpen && currentCard) {
+      loadComments();
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [isCommentsOpen, currentCard?.card_id]);
+
+  async function loadComments() {
+    setIsLoading(true);
+    try {
+      // TODO: Replace with real GET /get_comments when backend implements it
+      const result = await api.getComments(currentCard.card_id);
+      if (!result.error) {
+        setComments(result.result || []);
+      }
+    } catch (err) {
+      console.error('Load comments error:', err);
+    } finally {
+      setIsLoading(false);
+    }
+  }
+
+  async function handleSend() {
+    if (!newComment.trim() || isSending) return;
+    setIsSending(true);
+    try {
+      const result = await api.addComment(currentUser.id, currentCard.card_id, newComment.trim());
+      if (!result.error) {
+        setNewComment('');
+        showToast('Комментарий отправлен');
+        
+        // Optimistically add the new comment to the list
+        if (result.result) {
+          setComments(prev => [...prev, result.result]);
+          
+          // Scroll to bottom after adding
+          setTimeout(() => {
+            if (listRef.current) {
+              listRef.current.scrollTop = listRef.current.scrollHeight;
+            }
+          }, 100);
+        }
+      } else {
+        showToast('Ошибка: ' + (result.result || 'неизвестная'));
+      }
+    } catch (err) {
+      console.error('Send comment error:', err);
+    } finally {
+      setIsSending(false);
+    }
+  }
+
+  function handleKeyDown(e) {
+    if (e.key === 'Enter' && !e.shiftKey) {
+      e.preventDefault();
+      handleSend();
+    }
+  }
+
+  return (
+    <div className={`comments-panel ${isCommentsOpen ? 'comments-panel--open' : ''}`}>
+      <div className="comments-header">
+        <button
+          className="comments-close"
+          onClick={() => setIsCommentsOpen(false)}
+          aria-label="Закрыть"
+        >
+          ←
+        </button>
+        <h2 className="comments-title">Комментарии</h2>
+      </div>
+
+      <div className="comments-list custom-scroll" ref={listRef}>
+        {isLoading ? (
+          <p className="comments-placeholder">Загрузка...</p>
+        ) : comments.length === 0 ? (
+          <div className="comments-empty">
+            <p className="comments-empty-text">Комментариев пока нет</p>
+            <p className="comments-empty-sub">Будь первым!</p>
+          </div>
+        ) : (
+          comments.map((comment, i) => (
+            <CommentItem key={comment.comment_id || i} comment={comment} author={null} />
+          ))
+        )}
+      </div>
+
+      <div className="comments-input-area">
+        <textarea
+          className="comments-input"
+          placeholder="Ваш комментарий..."
+          value={newComment}
+          onChange={(e) => setNewComment(e.target.value)}
+          onKeyDown={handleKeyDown}
+          maxLength={300}
+          rows={1}
+        />
+        <button
+          className={`comments-send ${newComment.trim() ? 'comments-send--active' : ''}`}
+          onClick={handleSend}
+          disabled={!newComment.trim() || isSending}
+          aria-label="Отправить"
+        >
+          <svg viewBox="0 0 24 24" fill="currentColor" width="20" height="20">
+            <path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z" />
+          </svg>
+        </button>
+      </div>
+    </div>
+  );
+}

frontend/src/components/Menu/AboutPage.css

@@ -0,0 +1,61 @@
+.about-page {
+  padding: var(--space-lg);
+  overflow-y: auto;
+  max-height: 80vh;
+}
+
+.about-back {
+  font-size: 14px;
+  color: var(--color-muted);
+  margin-bottom: var(--space-lg);
+  padding: var(--space-xs) 0;
+  transition: color var(--duration-fast) var(--ease-smooth);
+}
+
+.about-back:hover {
+  color: var(--color-text);
+}
+
+.about-title {
+  font-family: var(--font-display);
+  font-size: 24px;
+  font-weight: 700;
+  margin-bottom: var(--space-lg);
+}
+
+.about-content {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-md);
+  margin-bottom: var(--space-xl);
+  line-height: 1.65;
+  font-size: 14px;
+  color: var(--color-muted);
+}
+
+.about-content strong {
+  color: var(--color-text);
+}
+
+.about-links {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+}
+
+.about-link {
+  display: flex;
+  align-items: center;
+  gap: var(--space-md);
+  padding: var(--space-md);
+  border-radius: var(--radius-sm);
+  background: var(--glass-bg);
+  border: 1px solid var(--glass-border);
+  font-size: 14px;
+  color: var(--color-stat-a);
+  transition: background var(--duration-fast) var(--ease-smooth);
+}
+
+.about-link:active {
+  background: rgba(255, 255, 255, 0.12);
+}

frontend/src/components/Menu/AboutPage.jsx

@@ -0,0 +1,60 @@
+import React from 'react';
+import './AboutPage.css';
+
+export default function AboutPage({ onBack }) {
+  function handleCopyEmail() {
+    navigator.clipboard.writeText('pseudo.developer.ru@gmail.com').then(() => {
+      // Visual feedback handled by CSS :active
+    }).catch(() => {
+      // Fallback — select text
+    });
+  }
+
+  return (
+    <div className="about-page custom-scroll">
+      <button className="about-back" onClick={onBack} aria-label="Назад">
+        ← Назад
+      </button>
+
+      <h2 className="about-title">О проекте</h2>
+
+      <div className="about-content">
+        <p>
+          <strong>This OR That</strong> — это open-source Telegram Mini App, 
+          в которой ты выбираешь один из двух вариантов и смотришь, 
+          что выбрали другие.
+        </p>
+        <p>
+          Проект создан для развлечения и исследования интересных 
+          дилемм. Все карточки проходят модерацию перед публикацией.
+        </p>
+        <p>
+          Поддержи проект или загляни в исходный код — 
+          мы открыты для идей и контрибьюций!
+        </p>
+      </div>
+
+      <div className="about-links">
+        <a
+          href="https://github.com/IgorVolochay/thisORthat"
+          target="_blank"
+          rel="noopener noreferrer"
+          className="about-link"
+        >
+          <svg viewBox="0 0 24 24" fill="currentColor" width="20" height="20">
+            <path d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0024 12c0-6.63-5.37-12-12-12z" />
+          </svg>
+          <span>Исходники проекта</span>
+        </a>
+
+        <button className="about-link" onClick={handleCopyEmail}>
+          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" width="20" height="20">
+            <path d="M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z" />
+            <polyline points="22,6 12,13 2,6" />
+          </svg>
+          <span>pseudo.developer.ru@gmail.com</span>
+        </button>
+      </div>
+    </div>
+  );
+}

frontend/src/components/Menu/CreateCard.css

@@ -0,0 +1,105 @@
+.create-card {
+  padding: var(--space-lg);
+  overflow-y: auto;
+  max-height: 80vh;
+}
+
+.create-back {
+  font-size: 14px;
+  color: var(--color-muted);
+  margin-bottom: var(--space-lg);
+  padding: var(--space-xs) 0;
+  transition: color var(--duration-fast) var(--ease-smooth);
+}
+
+.create-back:hover {
+  color: var(--color-text);
+}
+
+.create-title {
+  font-family: var(--font-display);
+  font-size: 24px;
+  font-weight: 700;
+  margin-bottom: var(--space-md);
+}
+
+.create-rules {
+  font-size: 13px;
+  line-height: 1.55;
+  color: var(--color-muted);
+  margin-bottom: var(--space-lg);
+}
+
+.create-fields {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  margin-bottom: var(--space-lg);
+}
+
+.create-field {
+  position: relative;
+  border-radius: var(--radius-card);
+  padding: var(--space-lg);
+  min-height: 100px;
+}
+
+.create-field--a {
+  background: linear-gradient(160deg, var(--color-card-a-from), var(--color-card-a-to));
+}
+
+.create-field--b {
+  background: linear-gradient(160deg, var(--color-card-b-from), var(--color-card-b-to));
+}
+
+.create-textarea {
+  width: 100%;
+  background: transparent;
+  color: var(--color-text);
+  font-family: var(--font-display);
+  font-size: 16px;
+  font-weight: 600;
+  text-align: center;
+  resize: none;
+  line-height: 1.4;
+}
+
+.create-textarea::placeholder {
+  color: rgba(255, 255, 255, 0.4);
+}
+
+.create-counter {
+  position: absolute;
+  bottom: var(--space-sm);
+  right: var(--space-md);
+  font-family: var(--font-mono);
+  font-size: 11px;
+  color: rgba(255, 255, 255, 0.35);
+}
+
+.create-submit {
+  width: 100%;
+  padding: var(--space-md) var(--space-lg);
+  border-radius: var(--radius-full);
+  font-family: var(--font-display);
+  font-size: 18px;
+  font-weight: 700;
+  color: var(--color-muted);
+  background: var(--glass-bg);
+  border: 1px solid var(--glass-border);
+  transition: all var(--duration-normal) var(--ease-smooth);
+}
+
+.create-submit--active {
+  color: var(--color-text);
+  background: linear-gradient(135deg, var(--color-card-a-to), var(--color-card-b-to));
+  border-color: transparent;
+}
+
+.create-submit:disabled {
+  cursor: default;
+}
+
+.create-submit--active:active {
+  transform: scale(0.97);
+}

frontend/src/components/Menu/CreateCard.jsx

@@ -0,0 +1,91 @@
+import React, { useState } from 'react';
+import { useApp } from '../../context/AppContext';
+import { currentUser } from '../../services/auth';
+import { api } from '../../services/api';
+import './CreateCard.css';
+
+const MAX_LENGTH = 150;
+
+export default function CreateCard({ onBack }) {
+  const { showToast, closeMenu } = useApp();
+  const [choiceA, setChoiceA] = useState('');
+  const [choiceB, setChoiceB] = useState('');
+  const [isSending, setIsSending] = useState(false);
+
+  const canSubmit = choiceA.trim().length > 0 && choiceB.trim().length > 0 && !isSending;
+
+  async function handleSubmit() {
+    if (!canSubmit) return;
+    setIsSending(true);
+    try {
+      const result = await api.addCard(choiceA.trim(), choiceB.trim(), currentUser.id);
+      if (!result.error) {
+        showToast('Карточка отправлена на модерацию!');
+        setTimeout(() => {
+          closeMenu();
+        }, 2000);
+      } else {
+        showToast('Ошибка: ' + (result.result || 'неизвестная'));
+        setIsSending(false);
+      }
+    } catch (err) {
+      console.error('Add card error:', err);
+      showToast('Ошибка отправки');
+      setIsSending(false);
+    }
+  }
+
+  return (
+    <div className="create-card custom-scroll">
+      <button className="create-back" onClick={onBack} aria-label="Назад">
+        ← Назад
+      </button>
+
+      <h2 className="create-title">Создать карточку</h2>
+
+      <p className="create-rules">
+        При создании карточек запрещается использование мата и ссылок.
+        Все карточки проходят процесс модерации перед публикацией.
+        Лимит по длине текста: {MAX_LENGTH} символов.
+      </p>
+
+      <div className="create-fields">
+        <div className="create-field create-field--a">
+          <textarea
+            className="create-textarea"
+            placeholder="Первый вариант"
+            value={choiceA}
+            onChange={(e) => setChoiceA(e.target.value.slice(0, MAX_LENGTH))}
+            maxLength={MAX_LENGTH}
+            rows={3}
+          />
+          <span className="create-counter">
+            {choiceA.length}/{MAX_LENGTH}
+          </span>
+        </div>
+
+        <div className="create-field create-field--b">
+          <textarea
+            className="create-textarea"
+            placeholder="Второй вариант"
+            value={choiceB}
+            onChange={(e) => setChoiceB(e.target.value.slice(0, MAX_LENGTH))}
+            maxLength={MAX_LENGTH}
+            rows={3}
+          />
+          <span className="create-counter">
+            {choiceB.length}/{MAX_LENGTH}
+          </span>
+        </div>
+      </div>
+
+      <button
+        className={`create-submit ${canSubmit ? 'create-submit--active' : ''}`}
+        onClick={handleSubmit}
+        disabled={!canSubmit}
+      >
+        {isSending ? 'Отправка...' : 'Отправить!'}
+      </button>
+    </div>
+  );
+}

frontend/src/components/Menu/MenuPanel.css

@@ -0,0 +1,59 @@
+.menu-panel {
+  position: fixed;
+  bottom: 0;
+  left: 50%;
+  transform: translateX(-50%) translateY(100%);
+  width: 100%;
+  max-width: 480px;
+  max-height: 85vh;
+  z-index: 60;
+  background: var(--color-bg-elevated);
+  border-radius: var(--radius-card) var(--radius-card) 0 0;
+  overflow: hidden;
+  display: flex;
+  flex-direction: column;
+  transition: transform var(--duration-normal) var(--ease-spring);
+}
+
+.menu-panel--open {
+  transform: translateX(-50%) translateY(0);
+}
+
+/* Menu list */
+.menu-list {
+  display: flex;
+  flex-direction: column;
+  padding: var(--space-xl) var(--space-lg);
+  gap: var(--space-xs);
+}
+
+.menu-item {
+  display: flex;
+  align-items: center;
+  gap: var(--space-md);
+  padding: var(--space-md) var(--space-md);
+  border-radius: var(--radius-sm);
+  transition: background var(--duration-fast) var(--ease-smooth);
+  color: var(--color-text);
+}
+
+.menu-item:active {
+  background: rgba(255, 255, 255, 0.06);
+}
+
+.menu-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 36px;
+  height: 36px;
+  border-radius: 50%;
+  background: var(--glass-bg);
+  color: var(--color-muted);
+  flex-shrink: 0;
+}
+
+.menu-label {
+  font-size: 16px;
+  font-weight: 500;
+}

frontend/src/components/Menu/MenuPanel.jsx

@@ -0,0 +1,89 @@
+import React, { useEffect } from 'react';
+import { useApp } from '../../context/AppContext';
+import { showBackButton } from '../../services/auth';
+import Overlay from '../common/Overlay';
+import AboutPage from './AboutPage';
+import CreateCard from './CreateCard';
+import './MenuPanel.css';
+
+export default function MenuPanel() {
+  const { isMenuOpen, closeMenu, menuScreen, setMenuScreen } = useApp();
+
+  // Telegram BackButton for sub-screens
+  useEffect(() => {
+    if (isMenuOpen && menuScreen !== 'menu') {
+      const cleanup = showBackButton(() => setMenuScreen('menu'));
+      return cleanup;
+    }
+    if (isMenuOpen && menuScreen === 'menu') {
+      const cleanup = showBackButton(() => closeMenu());
+      return cleanup;
+    }
+  }, [isMenuOpen, menuScreen, setMenuScreen, closeMenu]);
+
+  if (!isMenuOpen) return null;
+
+  // Sub-screens
+  if (menuScreen === 'about') {
+    return (
+      <>
+        <Overlay visible={true} onClick={closeMenu} />
+        <div className="menu-panel menu-panel--open">
+          <AboutPage onBack={() => setMenuScreen('menu')} />
+        </div>
+      </>
+    );
+  }
+
+  if (menuScreen === 'create') {
+    return (
+      <>
+        <Overlay visible={true} onClick={closeMenu} />
+        <div className="menu-panel menu-panel--open">
+          <CreateCard onBack={() => setMenuScreen('menu')} />
+        </div>
+      </>
+    );
+  }
+
+  return (
+    <>
+      <Overlay visible={true} onClick={closeMenu} />
+      <div className="menu-panel menu-panel--open">
+        <nav className="menu-list">
+          <button className="menu-item" onClick={() => setMenuScreen('about')}>
+            <span className="menu-icon">
+              <svg viewBox="0 0 24 24" fill="currentColor" width="22" height="22">
+                <circle cx="12" cy="12" r="10" fill="none" stroke="currentColor" strokeWidth="2" />
+                <path d="M12 16v-4M12 8h.01" stroke="currentColor" strokeWidth="2" strokeLinecap="round" />
+              </svg>
+            </span>
+            <span className="menu-label">О проекте</span>
+          </button>
+
+          <button className="menu-item" onClick={() => setMenuScreen('create')}>
+            <span className="menu-icon">
+              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" width="22" height="22">
+                <path d="M11 4H4a2 2 0 00-2 2v14a2 2 0 002 2h14a2 2 0 002-2v-7" />
+                <path d="M18.5 2.5a2.121 2.121 0 013 3L12 15l-4 1 1-4 9.5-9.5z" />
+              </svg>
+            </span>
+            <span className="menu-label">Создать карточку</span>
+          </button>
+
+          <button
+            className="menu-item"
+            onClick={() => window.open('https://boosty.to/pseudodev/donate', '_blank')}
+          >
+            <span className="menu-icon">
+              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" width="22" height="22">
+                <path d="M12 2v20M17 5H9.5a3.5 3.5 0 000 7h5a3.5 3.5 0 010 7H6" />
+              </svg>
+            </span>
+            <span className="menu-label">Поддержать проект</span>
+          </button>
+        </nav>
+      </div>
+    </>
+  );
+}

frontend/src/components/common/LoadingScreen.css

@@ -0,0 +1,58 @@
+.loading-screen {
+  height: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: var(--color-bg);
+}
+
+.loading-content {
+  text-align: center;
+}
+
+.loading-title {
+  font-family: var(--font-display);
+  font-size: 28px;
+  font-weight: 700;
+  color: var(--color-text);
+  letter-spacing: -0.5px;
+}
+
+.loading-or {
+  display: inline-block;
+  margin: 0 4px;
+  padding: 2px 10px;
+  background: linear-gradient(135deg, var(--color-card-a-to), var(--color-card-b-to));
+  border-radius: var(--radius-sm);
+  font-size: 20px;
+  vertical-align: middle;
+}
+
+.loading-error {
+  margin-top: var(--space-lg);
+  color: var(--color-dislike);
+  font-size: 14px;
+}
+
+.loading-dots {
+  display: flex;
+  gap: 8px;
+  justify-content: center;
+  margin-top: var(--space-lg);
+}
+
+.dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  background: var(--color-muted);
+  animation: dotPulse 1.4s infinite ease-in-out both;
+}
+
+.dot:nth-child(2) { animation-delay: 0.16s; }
+.dot:nth-child(3) { animation-delay: 0.32s; }
+
+@keyframes dotPulse {
+  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
+  40% { opacity: 1; transform: scale(1); }
+}

frontend/src/components/common/LoadingScreen.jsx

@@ -0,0 +1,23 @@
+import React from 'react';
+import './LoadingScreen.css';
+
+export default function LoadingScreen({ error }) {
+  return (
+    <div className="loading-screen">
+      <div className="loading-content">
+        <h1 className="loading-title">
+          this<span className="loading-or">OR</span>that
+        </h1>
+        {error ? (
+          <p className="loading-error">{error}</p>
+        ) : (
+          <div className="loading-dots">
+            <span className="dot" />
+            <span className="dot" />
+            <span className="dot" />
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

frontend/src/components/common/Overlay.css

@@ -0,0 +1,16 @@
+.overlay {
+  position: fixed;
+  inset: 0;
+  background: var(--overlay-bg);
+  backdrop-filter: blur(8px);
+  -webkit-backdrop-filter: blur(8px);
+  z-index: 50;
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity var(--duration-normal) var(--ease-smooth);
+}
+
+.overlay--visible {
+  opacity: 1;
+  pointer-events: auto;
+}

frontend/src/components/common/Overlay.jsx

@@ -0,0 +1,12 @@
+import React from 'react';
+import './Overlay.css';
+
+export default function Overlay({ visible, onClick }) {
+  return (
+    <div
+      className={`overlay ${visible ? 'overlay--visible' : ''}`}
+      onClick={onClick}
+      aria-hidden="true"
+    />
+  );
+}

frontend/src/components/common/Toast.css

@@ -0,0 +1,43 @@
+.toast {
+  position: fixed;
+  top: var(--space-lg);
+  left: 50%;
+  transform: translateX(-50%);
+  z-index: 1000;
+  animation: toastIn 300ms var(--ease-spring) forwards;
+}
+
+.toast-content {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  padding: var(--space-sm) var(--space-md);
+  background: var(--glass-bg);
+  backdrop-filter: blur(var(--glass-blur));
+  -webkit-backdrop-filter: blur(var(--glass-blur));
+  border: 1px solid var(--glass-border);
+  border-radius: var(--radius-full);
+  font-size: 14px;
+  font-weight: 500;
+  white-space: nowrap;
+}
+
+.toast-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 20px;
+  height: 20px;
+  border-radius: 50%;
+  background: var(--color-like);
+  font-size: 11px;
+}
+
+.toast-text {
+  color: var(--color-text);
+}
+
+@keyframes toastIn {
+  from { opacity: 0; transform: translateX(-50%) translateY(-12px); }
+  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
+}

frontend/src/components/common/Toast.jsx

@@ -0,0 +1,15 @@
+import React from 'react';
+import './Toast.css';
+
+export default function Toast({ message }) {
+  if (!message) return null;
+
+  return (
+    <div className="toast" role="status" aria-live="polite">
+      <div className="toast-content">
+        <span className="toast-icon">✓</span>
+        <span className="toast-text">{message}</span>
+      </div>
+    </div>
+  );
+}

frontend/src/context/AppContext.jsx

@@ -0,0 +1,189 @@
+import React, { createContext, useContext, useState, useCallback, useEffect } from 'react';
+import { api } from '../services/api';
+import { currentUser, initTelegramApp } from '../services/auth';
+
+const AppContext = createContext(null);
+
+export function AppProvider({ children }) {
+  // App state
+  const [isLoading, setIsLoading] = useState(true);
+  const [user, setUser] = useState(null);
+  const [error, setError] = useState(null);
+
+  // Card queue
+  const [cardQueue, setCardQueue] = useState([]);
+  const [currentCardIndex, setCurrentCardIndex] = useState(0);
+  const [chosenCard, setChosenCard] = useState(null); // null | "A" | "B"
+
+  // Panels
+  const [isMenuOpen, setIsMenuOpen] = useState(false);
+  const [isCommentsOpen, setIsCommentsOpen] = useState(false);
+  const [menuScreen, setMenuScreen] = useState('menu'); // 'menu' | 'about' | 'create'
+
+  // Toast
+  const [toast, setToast] = useState(null);
+
+  // Current card helper
+  const currentCard = cardQueue[currentCardIndex] || null;
+
+  // Initialize app
+  useEffect(() => {
+    async function init() {
+      try {
+        initTelegramApp();
+
+        // Check/register user
+        const checkResult = await api.checkUser(currentUser.id);
+        if (!checkResult.result) {
+          await api.addUser({
+            user_id: currentUser.id,
+            username: currentUser.username,
+            first_name: currentUser.first_name,
+            last_name: currentUser.last_name,
+            photo_url: currentUser.photo_url,
+          });
+        }
+
+        const userResult = await api.getUser(currentUser.id);
+        if (!userResult.error) {
+          setUser(userResult.result);
+        }
+
+        // Load first batch of cards
+        await loadCards();
+      } catch (err) {
+        setError('Не удалось загрузить приложение');
+        console.error('Init error:', err);
+      } finally {
+        setIsLoading(false);
+      }
+    }
+    init();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  // Load cards batch
+  const loadCards = useCallback(async () => {
+    try {
+      const result = await api.getRandomCards(currentUser.id);
+      if (!result.error && Array.isArray(result.result) && result.result.length > 0) {
+        setCardQueue(result.result);
+        setCurrentCardIndex(0);
+        setChosenCard(null);
+      } else {
+        // No more cards or error
+        setCardQueue([]);
+        setCurrentCardIndex(0);
+      }
+    } catch (err) {
+      console.error('Load cards error:', err);
+      setError('Ошибка загрузки карточек');
+    }
+  }, []);
+
+  // Choose a card (A or B)
+  const chooseCard = useCallback((choice) => {
+    if (chosenCard) {
+      // Second tap on chosen card — go next
+      if (choice === chosenCard) {
+        goToNextCard();
+      }
+      return;
+    }
+    setChosenCard(choice);
+    // Fire select_choice to backend
+    if (currentCard) {
+      api.selectChoice(currentUser.id, currentCard.card_id, choice).catch(console.error);
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [chosenCard, currentCard]);
+
+  // Go to next card
+  const goToNextCard = useCallback(async () => {
+    const nextIndex = currentCardIndex + 1;
+    if (nextIndex < cardQueue.length) {
+      setCurrentCardIndex(nextIndex);
+      setChosenCard(null);
+    } else {
+      // Load next batch
+      await loadCards();
+    }
+  }, [currentCardIndex, cardQueue.length, loadCards]);
+
+  // Reactions
+  const likeCard = useCallback(async () => {
+    if (!currentCard || !chosenCard) return;
+    const result = await api.likeCard(currentUser.id, currentCard.card_id);
+    if (!result.error) {
+      // Refresh user data to get updated liked_card_ids
+      const userResult = await api.getUser(currentUser.id);
+      if (!userResult.error) setUser(userResult.result);
+    }
+    return result;
+  }, [currentCard, chosenCard]);
+
+  const dislikeCard = useCallback(async () => {
+    if (!currentCard || !chosenCard) return;
+    const result = await api.dislikeCard(currentUser.id, currentCard.card_id);
+    if (!result.error) {
+      const userResult = await api.getUser(currentUser.id);
+      if (!userResult.error) setUser(userResult.result);
+    }
+    return result;
+  }, [currentCard, chosenCard]);
+
+  // Toast helper
+  const showToast = useCallback((message, duration = 2500) => {
+    setToast(message);
+    setTimeout(() => setToast(null), duration);
+  }, []);
+
+  // Menu helpers
+  const openMenu = useCallback(() => {
+    setIsMenuOpen(true);
+    setMenuScreen('menu');
+  }, []);
+
+  const closeMenu = useCallback(() => {
+    setIsMenuOpen(false);
+    setMenuScreen('menu');
+  }, []);
+
+  const value = {
+    // State
+    isLoading,
+    user,
+    error,
+    currentCard,
+    chosenCard,
+    cardQueue,
+    currentCardIndex,
+    isMenuOpen,
+    isCommentsOpen,
+    menuScreen,
+    toast,
+
+    // Actions
+    chooseCard,
+    goToNextCard,
+    loadCards,
+    likeCard,
+    dislikeCard,
+    openMenu,
+    closeMenu,
+    setMenuScreen,
+    setIsCommentsOpen,
+    showToast,
+    setError,
+  };
+
+  return <AppContext.Provider value={value}>{children}</AppContext.Provider>;
+}
+
+export function useApp() {
+  const context = useContext(AppContext);
+  if (!context) {
+    throw new Error('useApp must be used within AppProvider');
+  }
+  return context;
+}

frontend/src/index.css

@@ -0,0 +1,150 @@
+/* ============================================
+   This OR That — Design System
+   Palette: "Abyss Neon"
+   ============================================ */
+
+@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@400;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@500;700&display=swap');
+
+/* ---------- Design Tokens ---------- */
+:root {
+  /* Background */
+  --color-bg: #070711;
+  --color-bg-elevated: #0D0C1E;
+
+  /* Card A — Deep Violet */
+  --color-card-a-from: #1D0658;
+  --color-card-a-to: #7C3AED;
+
+  /* Card B — Electric Blue */
+  --color-card-b-from: #0F2027;
+  --color-card-b-to: #0284C7;
+
+  /* Text */
+  --color-text: #F8FAFC;
+  --color-muted: #94A3B8;
+
+  /* Stats accent per card */
+  --color-stat-a: #A78BFA;
+  --color-stat-b: #38BDF8;
+
+  /* Reactions */
+  --color-like: #7C3AED;
+  --color-dislike: #EF4444;
+
+  /* Glassmorphism surfaces */
+  --glass-bg: rgba(255, 255, 255, 0.07);
+  --glass-border: rgba(255, 255, 255, 0.12);
+  --glass-blur: 12px;
+
+  /* Overlay */
+  --overlay-bg: rgba(7, 7, 17, 0.75);
+
+  /* Typography */
+  --font-display: 'Unbounded', sans-serif;
+  --font-body: 'Inter', sans-serif;
+  --font-mono: 'JetBrains Mono', monospace;
+
+  /* Spacing */
+  --space-xs: 4px;
+  --space-sm: 8px;
+  --space-md: 16px;
+  --space-lg: 24px;
+  --space-xl: 32px;
+
+  /* Radius */
+  --radius-card: 20px;
+  --radius-sm: 10px;
+  --radius-full: 9999px;
+
+  /* Transitions */
+  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
+  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
+  --duration-card: 600ms;
+  --duration-fast: 200ms;
+  --duration-normal: 300ms;
+
+  /* Bottom bar height */
+  --bar-height: 64px;
+}
+
+/* ---------- Global Reset ---------- */
+*, *::before, *::after {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+html, body, #root {
+  height: 100%;
+  width: 100%;
+  overflow: hidden;
+}
+
+body {
+  font-family: var(--font-body);
+  font-size: 15px;
+  line-height: 1.5;
+  color: var(--color-text);
+  background: var(--color-bg);
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-tap-highlight-color: transparent;
+  user-select: none;
+  overscroll-behavior: none;
+}
+
+button {
+  font-family: inherit;
+  border: none;
+  background: none;
+  color: inherit;
+  cursor: pointer;
+  -webkit-tap-highlight-color: transparent;
+}
+
+input, textarea {
+  font-family: inherit;
+  border: none;
+  outline: none;
+  background: none;
+  color: inherit;
+}
+
+a {
+  color: inherit;
+  text-decoration: none;
+}
+
+/* ---------- Scrollbar (for panels) ---------- */
+.custom-scroll::-webkit-scrollbar {
+  width: 4px;
+}
+
+.custom-scroll::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.custom-scroll::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.15);
+  border-radius: var(--radius-full);
+}
+
+/* ---------- App Shell ---------- */
+.app {
+  height: 100%;
+  width: 100%;
+  display: flex;
+  flex-direction: column;
+  position: relative;
+  max-width: 480px;
+  margin: 0 auto;
+}
+
+/* ---------- Reduced Motion ---------- */
+@media (prefers-reduced-motion: reduce) {
+  *, *::before, *::after {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+  }
+}

frontend/src/index.js

@@ -0,0 +1,11 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import './index.css';
+import App from './App';
+
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);

frontend/src/logo.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3"><g fill="#61DAFB"><path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/><circle cx="420.9" cy="296.5" r="45.7"/><path d="M520.5 78.1z"/></g></svg>

frontend/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

frontend/src/services/api.js

@@ -0,0 +1,66 @@
+/**
+ * API service — all backend requests for This OR That.
+ * All endpoints return { result, error } (BaseResponse).
+ */
+
+const BASE_URL = process.env.REACT_APP_API_URL || '/api';
+
+async function request(method, path, body = null) {
+  const options = {
+    method,
+    headers: { 'Content-Type': 'application/json' },
+  };
+  if (body) {
+    options.body = JSON.stringify(body);
+  }
+
+  const response = await fetch(`${BASE_URL}${path}`, options);
+  const data = await response.json();
+  return data;
+}
+
+const GET = (path) => request('GET', path);
+const POST = (path, body) => request('POST', path, body);
+const PATCH = (path, body) => request('PATCH', path, body);
+
+export const api = {
+  // Users
+  checkUser: (userId) =>
+    GET(`/check_user?user_id=${userId}`),
+
+  getUser: (userId) =>
+    GET(`/get_user?user_id=${userId}`),
+
+  addUser: ({ user_id, username, first_name, last_name, photo_url }) =>
+    POST('/add_user', { user_id, username, first_name, last_name, photo_url }),
+
+  // Cards
+  getCard: (cardId) =>
+    GET(`/get_card?card_id=${cardId}`),
+
+  getRandomCards: (userId) =>
+    GET(`/get_random_cards?user_id=${userId}`),
+
+  selectChoice: (userId, cardId, choice) =>
+    PATCH('/select_choice', { user_id: userId, card_id: cardId, choice }),
+
+  addCard: (choiceA, choiceB, authorId) =>
+    POST('/add_card', { choice_A: choiceA, choice_B: choiceB, author_id: authorId }),
+
+  // Reactions
+  likeCard: (userId, cardId) =>
+    PATCH('/like_card', { user_id: userId, card_id: cardId }),
+
+  dislikeCard: (userId, cardId) =>
+    PATCH('/dislike_card', { user_id: userId, card_id: cardId }),
+
+  // Comments
+  addComment: (authorId, cardId, commentText) =>
+    POST('/comment', { author_id: authorId, card_id: cardId, comment_text: commentText }),
+
+  // TODO: GET /get_comments — endpoint not yet implemented on backend
+  getComments: (cardId) => {
+    console.warn('GET /get_comments not implemented on backend yet');
+    return Promise.resolve({ result: [], error: false });
+  },
+};

frontend/src/services/auth.js

@@ -0,0 +1,55 @@
+/**
+ * Auth service — detects Telegram WebApp user or falls back to mock.
+ * Auto-registers user on backend if not yet registered.
+ */
+
+const MOCK_USER = {
+  id: 999995,
+  first_name: 'Dev',
+  last_name: 'User',
+  username: 'devuser',
+  photo_url: '',
+};
+
+function getTelegramUser() {
+  try {
+    const tg = window.Telegram?.WebApp;
+    const user = tg?.initDataUnsafe?.user;
+    if (user && user.id) {
+      return {
+        id: user.id,
+        first_name: user.first_name || '',
+        last_name: user.last_name || '',
+        username: user.username || '',
+        photo_url: user.photo_url || '',
+      };
+    }
+  } catch {
+    // Telegram SDK not available
+  }
+  return null;
+}
+
+export const currentUser = getTelegramUser() ?? MOCK_USER;
+export const isTelegram = !!getTelegramUser();
+
+export function initTelegramApp() {
+  const tg = window.Telegram?.WebApp;
+  if (tg) {
+    tg.ready();
+    tg.expand();
+  }
+}
+
+export function showBackButton(onBack) {
+  const tg = window.Telegram?.WebApp;
+  if (tg?.BackButton) {
+    tg.BackButton.show();
+    tg.BackButton.onClick(onBack);
+    return () => {
+      tg.BackButton.offClick(onBack);
+      tg.BackButton.hide();
+    };
+  }
+  return () => { };
+}

frontend/src/setupTests.js

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';

requirements.txt

@@ -1,2 +0,0 @@
-fastapi==0.115.7
-pymongo==4.10.1