/**
 * Scénario combiné: health, auth, tracks, playlists, marketplace
 * Usage: k6 run loadtests/backend/full.js
 */
import http from 'k6/http';
import { check, sleep } from 'k6';
import { randomString } from 'https://jslib.k6.io/k6-utils/1.2.0/index.js';

const BASE_URL = __ENV.BASE_URL || __ENV.API_ORIGIN || 'http://localhost:8080';
const TEST_EMAIL_PREFIX = __ENV.TEST_EMAIL_PREFIX || 'user+full';
const TEST_EMAIL_DOMAIN = __ENV.TEST_EMAIL_DOMAIN || 'example.com';
const TEST_PASSWORD_PREFIX = __ENV.TEST_PASSWORD_PREFIX || 'V3za!full-';

function generateTestUser() {
  const rand = randomString(8);
  const pwd = `${TEST_PASSWORD_PREFIX}${rand}`;
  return {
    email: `${TEST_EMAIL_PREFIX}${rand}@${TEST_EMAIL_DOMAIN}`,
    password: pwd,
    password_confirmation: pwd,
    username: `fu${rand}`,
  };
}

export const options = {
  scenarios: {
    health: {
      executor: 'constant-vus',
      vus: 5,
      duration: '1m',
      startTime: '0s',
      exec: 'healthScenario',
    },
    auth: {
      executor: 'ramping-vus',
      stages: [
        { duration: '30s', target: 10 },
        { duration: '1m', target: 10 },
        { duration: '30s', target: 0 },
      ],
      startTime: '10s',
      exec: 'authScenario',
    },
    tracks: {
      executor: 'ramping-vus',
      stages: [
        { duration: '30s', target: 15 },
        { duration: '2m', target: 15 },
        { duration: '30s', target: 0 },
      ],
      startTime: '20s',
      exec: 'tracksScenario',
    },
    playlists: {
      executor: 'ramping-vus',
      stages: [
        { duration: '30s', target: 5 },
        { duration: '1m', target: 5 },
        { duration: '30s', target: 0 },
      ],
      startTime: '30s',
      exec: 'playlistsScenario',
    },
    marketplace: {
      executor: 'ramping-vus',
      stages: [
        { duration: '30s', target: 5 },
        { duration: '1m', target: 5 },
        { duration: '30s', target: 0 },
      ],
      startTime: '40s',
      exec: 'marketplaceScenario',
    },
  },
  thresholds: {
    http_req_duration: ['p(95)<1000', 'p(99)<2000'],
    http_req_failed: ['rate<0.15'],
  },
};

export function setup() {
  const users = [];
  const baseURL = `${BASE_URL}/api/v1/auth`;
  for (let i = 0; i < 25; i++) {
    const user = generateTestUser();
    const registerRes = http.post(`${baseURL}/register`, JSON.stringify(user), {
      headers: { 'Content-Type': 'application/json' },
    });
    if (registerRes.status === 201) {
      const loginRes = http.post(`${baseURL}/login`, JSON.stringify({ email: user.email, password: user.password }), {
        headers: { 'Content-Type': 'application/json' },
      });
      if (loginRes.status === 200) {
        try {
          const body = JSON.parse(loginRes.body);
          const token = body.data?.token?.access_token;
          if (token) users.push({ ...user, token });
        } catch (e) {}
      }
    }
  }
  return { users };
}

export function healthScenario() {
  const healthRes = http.get(`${BASE_URL}/health`);
  check(healthRes, { 'health 200': (r) => r.status === 200 });
  sleep(0.5);
  const readyzRes = http.get(`${BASE_URL}/readyz`);
  check(readyzRes, { 'readyz 200': (r) => r.status === 200 });
  sleep(1);
}

export function authScenario(data) {
  const { users } = data;
  if (users.length === 0) return;
  const user = users[Math.floor(Math.random() * users.length)];
  const loginRes = http.post(
    `${BASE_URL}/api/v1/auth/login`,
    JSON.stringify({ email: user.email, password: user.password }),
    { headers: { 'Content-Type': 'application/json' } }
  );
  check(loginRes, { 'login 200': (r) => r.status === 200 });
  sleep(1);
}

export function tracksScenario(data) {
  const { users } = data;
  const headers = users.length > 0
    ? { Authorization: `Bearer ${users[Math.floor(Math.random() * users.length)].token}` }
    : {};
  const tracksRes = http.get(`${BASE_URL}/api/v1/tracks`, { headers });
  check(tracksRes, { 'tracks 200 or 401': (r) => r.status === 200 || r.status === 401 });
  sleep(0.5);
  const searchRes = http.get(`${BASE_URL}/api/v1/tracks/search?q=test`, { headers });
  check(searchRes, { 'search 200 or 401': (r) => r.status === 200 || r.status === 401 });
  sleep(1);
}

export function playlistsScenario(data) {
  const { users } = data;
  if (users.length === 0) return;
  const user = users[Math.floor(Math.random() * users.length)];
  const headers = { Authorization: `Bearer ${user.token}` };
  const listRes = http.get(`${BASE_URL}/api/v1/playlists`, { headers });
  check(listRes, { 'playlists 200': (r) => r.status === 200 });
  sleep(1);
}

export function marketplaceScenario() {
  const productsRes = http.get(`${BASE_URL}/api/v1/marketplace/products`);
  check(productsRes, { 'products 200': (r) => r.status === 200 });
  sleep(1);
}