import { test } from 'node:test';
import assert from 'node:assert/strict';
import { buildRecord, sanitizeItem, shouldSave } from '../src/lib/record.js';

const settings = { threshold: 5, minViews: 10000 };
const NOW = new Date('2026-10-25T10:00:00.000Z');
const NOW_ISO = NOW.toISOString();

test('shouldSave accepts a video exactly at both limits', () => {
  assert.equal(shouldSave({ views: 10000, outlierScore: 5 }, settings), true);
});

test('shouldSave rejects a low score, low views or a missing score', () => {
  assert.equal(shouldSave({ views: 50000, outlierScore: 4.99 }, settings), false);
  assert.equal(shouldSave({ views: 9999, outlierScore: 150 }, settings), false);
  assert.equal(shouldSave({ views: 50000, outlierScore: null }, settings), false);
});

const raw = (over = {}) => ({
  videoId: 'Tts9NHL8D8I',
  title: 'Agar.io - 88k Score',
  thumbnailUrl: 'https://i.ytimg.com/vi/Tts9NHL8D8I/hq720.jpg',
  channelTitle: 'Wun Wun',
  channelUrl: 'https://www.youtube.com/@wunwun9522',
  subscribers: 571000,
  views: 59000000,
  outlierScore: 146.19,
  isShort: false,
  page: 'home',
  ...over,
});

test('sanitizeItem passes a valid item through unchanged', () => {
  assert.deepEqual(sanitizeItem(raw()), raw());
});

test('sanitizeItem rejects items without a usable id, score or views', () => {
  for (const bad of [
    null,
    undefined,
    'x',
    {},
    raw({ videoId: 'short' }),
    raw({ outlierScore: NaN }),
    raw({ outlierScore: null }),
    raw({ outlierScore: -1 }),
    raw({ views: null }),
    raw({ views: -5 }),
    raw({ views: '5' }),
  ]) {
    assert.equal(sanitizeItem(bad), null, JSON.stringify(bad));
  }
});

test('sanitizeItem nulls out unusable optional fields', () => {
  const item = sanitizeItem(
    raw({
      title: '   ',
      thumbnailUrl: 'javascript:alert(1)',
      channelTitle: 5,
      channelUrl: 'https://evil.example.com/@x',
      subscribers: -3,
      isShort: 'yes',
      page: 'nowhere',
    }),
  );
  assert.deepEqual(
    item,
    raw({ title: null, thumbnailUrl: null, channelTitle: null, channelUrl: null, subscribers: null, isShort: false, page: 'home' }),
  );
});

test('sanitizeItem trims and caps the title and rounds the score', () => {
  const item = sanitizeItem(raw({ title: `  ${'x'.repeat(400)}  `, outlierScore: 12.3456 }));
  assert.equal(item.title.length, 300);
  assert.equal(item.outlierScore, 12.35);
});

test('buildRecord creates a full record for a new outlier', () => {
  assert.deepEqual(buildRecord(sanitizeItem(raw()), undefined, settings, NOW), {
    videoId: 'Tts9NHL8D8I',
    title: 'Agar.io - 88k Score',
    url: 'https://www.youtube.com/watch?v=Tts9NHL8D8I',
    thumbnailUrl: 'https://i.ytimg.com/vi/Tts9NHL8D8I/hq720.jpg',
    channelTitle: 'Wun Wun',
    channelUrl: 'https://www.youtube.com/@wunwun9522',
    subscribers: 571000,
    views: 59000000,
    outlierScore: 146.19,
    isShort: false,
    foundOn: 'home',
    firstSeenAt: NOW_ISO,
    updatedAt: NOW_ISO,
  });
});

test('buildRecord skips a new video below the threshold', () => {
  assert.equal(buildRecord(sanitizeItem(raw({ outlierScore: 2 })), undefined, settings, NOW), null);
  assert.equal(buildRecord(sanitizeItem(raw({ views: 500 })), undefined, settings, NOW), null);
});

test('buildRecord keeps updating an already saved video even below the threshold', () => {
  const previous = buildRecord(sanitizeItem(raw()), undefined, settings, new Date('2026-10-20T00:00:00.000Z'));
  const updated = buildRecord(sanitizeItem(raw({ outlierScore: 1.5, views: 60000000, page: 'search' })), previous, settings, NOW);
  assert.equal(updated.outlierScore, 1.5);
  assert.equal(updated.views, 60000000);
  assert.equal(updated.updatedAt, NOW_ISO);
  assert.equal(updated.firstSeenAt, '2026-10-20T00:00:00.000Z');
  assert.equal(updated.foundOn, 'home');
});

test('buildRecord keeps known values when the new sighting lacks them', () => {
  const previous = buildRecord(sanitizeItem(raw({ isShort: true })), undefined, settings, new Date('2026-10-20T00:00:00.000Z'));
  const updated = buildRecord(
    sanitizeItem(raw({ subscribers: null, channelTitle: null, channelUrl: null, thumbnailUrl: null, title: null, isShort: false })),
    previous,
    settings,
    NOW,
  );
  assert.equal(updated.subscribers, 571000);
  assert.equal(updated.channelTitle, 'Wun Wun');
  assert.equal(updated.channelUrl, 'https://www.youtube.com/@wunwun9522');
  assert.equal(updated.thumbnailUrl, 'https://i.ytimg.com/vi/Tts9NHL8D8I/hq720.jpg');
  assert.equal(updated.title, 'Agar.io - 88k Score');
  assert.equal(updated.isShort, true);
});

test('buildRecord falls back to the id when a new video has no title', () => {
  const record = buildRecord(sanitizeItem(raw({ title: null })), undefined, settings, NOW);
  assert.equal(record.title, 'Tts9NHL8D8I');
});