import { test } from 'node:test';
import assert from 'node:assert/strict';
import { computeScore, shouldSave } from '../src/lib/score.js';

test('computeScore divides views by subscribers', () => {
  assert.equal(computeScore(100000, 20000), 5);
  assert.equal(computeScore(2500, 1000), 2.5);
});

test('computeScore rounds to two decimals', () => {
  assert.equal(computeScore(10000, 3000), 3.33);
});

test('computeScore never divides by zero', () => {
  assert.equal(computeScore(5000, 0), 5000);
});

test('computeScore returns null when subscribers are unknown', () => {
  assert.equal(computeScore(5000, null), null);
  assert.equal(computeScore(5000, undefined), null);
});

const settings = { threshold: 5, minViews: 10000 };

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

test('shouldSave rejects a score below the threshold', () => {
  assert.equal(shouldSave({ views: 50000, score: 4.99, vidiqScore: null }, settings), false);
});

test('shouldSave rejects views below the minimum even with a huge score', () => {
  assert.equal(shouldSave({ views: 9999, score: 50, vidiqScore: null }, settings), false);
});

test('shouldSave rejects a null score without a VidIQ score', () => {
  assert.equal(shouldSave({ views: 500000, score: null, vidiqScore: null }, settings), false);
});

test('shouldSave accepts any video that has a VidIQ score', () => {
  assert.equal(shouldSave({ views: 100, score: null, vidiqScore: 7.5 }, settings), true);
  assert.equal(shouldSave({ views: 100, score: 0.01, vidiqScore: 3 }, settings), true);
});