'use strict';
/**
 * Integration tests: /api/practice — прогресс ученика в ИИ-тренажёре (Фаза 0).
 * Covers: auth-only (401); correct создаёт строку; wrong не растит solved, но
 * растит attempts и обнуляет серию; серия из MASTERY_STREAK → mastered;
 * прогресс per-user; валидация входа (400).
 */
const { describe, it, before } = require('node:test');
const assert = require('node:assert/strict');
const { app, inject, getToken, cleanup } = require('./setup');

// Mount /api/practice on the shared test app (setup.js не монтирует новые роуты).
app.use('/api/practice', require('../src/routes/practice'));

const { after } = require('node:test');
after(() => cleanup());

const SKILL = 'linear-basic';

describe('/api/practice progress', () => {
  let token;

  before(async () => {
    token = (await getToken('student')).token;
  });

  it('GET /progress requires auth (401)', async () => {
    const res = await inject('GET', '/api/practice/progress', null, null);
    assert.equal(res.status, 401, `got ${res.status}`);
  });

  it('POST /attempt requires auth (401)', async () => {
    const res = await inject('POST', '/api/practice/attempt', { skill: SKILL, correct: true }, null);
    assert.equal(res.status, 401, `got ${res.status}`);
  });

  it('correct attempt creates a row (solved=1, streak=1)', async () => {
    const res = await inject('POST', '/api/practice/attempt', { skill: SKILL, correct: true }, token);
    assert.equal(res.status, 200, `got ${res.status}`);
    assert.equal(res.body.ok, true);
    assert.equal(res.body.progress.skill, SKILL);
    assert.equal(res.body.progress.solved, 1);
    assert.equal(res.body.progress.attempts, 1);
    assert.equal(res.body.progress.cur_streak, 1);
    assert.equal(res.body.progress.best_streak, 1);
    assert.equal(res.body.progress.mastered, 0);
  });

  it('GET /progress lists the row', async () => {
    const res = await inject('GET', '/api/practice/progress', null, token);
    assert.equal(res.status, 200, `got ${res.status}`);
    assert.ok(Array.isArray(res.body.progress));
    const row = res.body.progress.find(r => r.skill === SKILL);
    assert.ok(row, 'skill row present');
    assert.equal(row.solved, 1);
  });

  it('wrong attempt: attempts++, solved unchanged, streak resets to 0', async () => {
    const res = await inject('POST', '/api/practice/attempt', { skill: SKILL, correct: false }, token);
    assert.equal(res.status, 200, `got ${res.status}`);
    assert.equal(res.body.progress.solved, 1, 'solved unchanged');
    assert.equal(res.body.progress.attempts, 2, 'attempts incremented');
    assert.equal(res.body.progress.cur_streak, 0, 'streak reset');
    assert.equal(res.body.progress.best_streak, 1, 'best streak kept');
  });

  it('streak of 5 correct → mastered=1 (and stays mastered after a miss)', async () => {
    const sk = 'mastery-skill';
    let last;
    for (let i = 0; i < 5; i++) {
      last = await inject('POST', '/api/practice/attempt', { skill: sk, correct: true }, token);
    }
    assert.equal(last.body.progress.cur_streak, 5);
    assert.equal(last.body.progress.best_streak, 5);
    assert.equal(last.body.progress.mastered, 1, 'mastered after 5 in a row');

    const miss = await inject('POST', '/api/practice/attempt', { skill: sk, correct: false }, token);
    assert.equal(miss.body.progress.cur_streak, 0, 'streak reset on miss');
    assert.equal(miss.body.progress.mastered, 1, 'mastered is sticky');
  });

  it('progress is per-user (другой ученик начинает с нуля)', async () => {
    const other = (await getToken('student')).token;
    const res = await inject('POST', '/api/practice/attempt', { skill: SKILL, correct: true }, other);
    assert.equal(res.status, 200, `got ${res.status}`);
    assert.equal(res.body.progress.attempts, 1, 'fresh user has attempts=1');
    assert.equal(res.body.progress.solved, 1);
  });

  it('validation: missing skill → 400', async () => {
    const res = await inject('POST', '/api/practice/attempt', { correct: true }, token);
    assert.equal(res.status, 400, `got ${res.status}`);
  });

  it('validation: correct not boolean → 400', async () => {
    const res = await inject('POST', '/api/practice/attempt', { skill: SKILL, correct: 'yes' }, token);
    assert.equal(res.status, 400, `got ${res.status}`);
  });

  it('validation: skill too long → 400', async () => {
    const res = await inject('POST', '/api/practice/attempt', { skill: 'x'.repeat(200), correct: true }, token);
    assert.equal(res.status, 400, `got ${res.status}`);
  });
});