import { type Page, type Locator, expect } from '@playwright/test';

// =============================================================================
// CONFIGURATION — Basee sur le code source reel de Veza
// =============================================================================

export const CONFIG = {
  /** Base URL du frontend Vite dev server (use 127.0.0.1 to avoid IPv6 ::1 resolution issues) */
  baseURL: process.env.PLAYWRIGHT_BASE_URL || `http://127.0.0.1:${process.env.PORT || '5173'}`,

  /** Base URL de l'API backend (proxied via Vite en dev) */
  apiURL: process.env.PLAYWRIGHT_API_URL || `http://127.0.0.1:${process.env.PORT || '5173'}`,

  /** Base URL du stream server Rust */
  streamURL: process.env.PLAYWRIGHT_STREAM_URL || 'http://localhost:18082',

  /** Comptes de test (seed: veza-backend-api/cmd/tools/seed/seed_users.go) */
  users: {
    listener: {
      email: 'user@veza.music',
      password: 'User123!',
      username: 'music_fan',
    },
    creator: {
      email: 'artist@veza.music',
      password: 'Artist123!',
      username: 'top_artist',
    },
    admin: {
      email: 'admin@veza.music',
      password: 'Admin123!',
      username: 'admin_veza',
    },
    moderator: {
      email: 'mod@veza.music',
      password: 'Mod123!',
      username: 'mod_veza',
    },
  },

  /** Timeouts (ms) */
  timeouts: {
    navigation: 15_000,
    action: 5_000,
    animation: 1_000,
    networkIdle: 10_000,
  },
} as const;

// =============================================================================
// AUTH HELPERS
// =============================================================================

/**
 * Login via l'interface utilisateur (page /login).
 * STRICT: echoue si le login ne redirige pas hors de /login.
 */
export async function loginViaUI(
  page: Page,
  email: string,
  password: string,
  options: { rememberMe?: boolean } = {},
): Promise<void> {
  await page.goto(`${CONFIG.baseURL}/login`, { waitUntil: 'domcontentloaded' });

  // Wait for the app to finish initializing (splash -> login form)
  await page.locator('main, [role="main"]').first().waitFor({
    state: 'visible',
    timeout: CONFIG.timeouts.navigation,
  });

  const emailInput = page.locator('input[type="email"]');
  await emailInput.waitFor({ state: 'visible', timeout: CONFIG.timeouts.navigation });
  await emailInput.clear();
  await emailInput.fill(email);

  const passwordInput = page.locator('input[type="password"]');
  await passwordInput.clear();
  await passwordInput.fill(password);

  if (options.rememberMe) {
    const rememberMe = page.locator('#remember_me');
    if (await rememberMe.isVisible()) {
      await rememberMe.check();
    }
  }

  const submitBtn = page.getByTestId('login-submit');
  await expect(submitBtn).toBeVisible({ timeout: CONFIG.timeouts.action });
  await submitBtn.click();

  // STRICT: must redirect away from /login
  await page.waitForURL((url) => !url.pathname.includes('/login'), {
    timeout: CONFIG.timeouts.navigation,
  });
}

/**
 * Login via l'API directement (plus rapide, pour les tests qui n'ont pas besoin de tester le login).
 * STRICT: echoue si l'API retourne une erreur.
 */
export async function loginViaAPI(
  page: Page,
  email: string,
  password: string,
): Promise<void> {
  const base = CONFIG.baseURL;
  await page.goto(`${base}/`, { waitUntil: 'commit', timeout: CONFIG.timeouts.navigation });

  const response = await page.request.post(`${base}/api/v1/auth/login`, {
    data: { email, password, remember_me: false },
  });

  // STRICT: login must succeed
  expect(response.ok(), `Login API failed: ${response.status()} for ${email}`).toBeTruthy();

  await page.evaluate(() => {
    const authState = {
      state: { isAuthenticated: true, isLoading: false, error: null },
      version: 1,
    };
    localStorage.setItem('auth-storage', JSON.stringify(authState));
  });

  await page.goto(`${CONFIG.baseURL}/dashboard`, { waitUntil: 'domcontentloaded', timeout: 30_000 });
  // Wait for auth initialization to complete
  await page.locator('main, [role="main"]').first().waitFor({
    state: 'visible',
    timeout: 20_000,
  });
}

// =============================================================================
// NAVIGATION HELPERS
// =============================================================================

/**
 * Navigue vers un path et attend que l'app soit prete.
 * STRICT: echoue si la page ne charge pas (main element must appear).
 */
export async function navigateTo(page: Page, path: string): Promise<void> {
  const url = path.startsWith('http') ? path : `${CONFIG.baseURL}${path}`;
  await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30_000 });
  await page.waitForLoadState('networkidle').catch(() => {
    // networkidle can legitimately timeout on pages with websockets/polling — not a test failure
  });
  // App must render a main content area
  await page.locator('main, [role="main"]').first().waitFor({
    state: 'visible',
    timeout: 20_000,
  });
}

/**
 * Verifie qu'une page se charge sans erreur critique.
 * STRICT: fails on 500 errors visible in the page.
 */
export async function assertPageLoads(page: Page, path: string): Promise<string[]> {
  const errors: string[] = [];

  page.on('console', (msg) => {
    if (msg.type() === 'error') {
      errors.push(msg.text());
    }
  });

  page.on('pageerror', (err) => {
    errors.push(err.message);
  });

  await navigateTo(page, path);

  const body = await page.textContent('body') || '';
  expect(body).not.toMatch(/500|Internal Server Error/i);

  return errors;
}

// =============================================================================
// FORM HELPERS
// =============================================================================

/**
 * Remplit un formulaire avec les champs donnes.
 */
export async function fillForm(
  page: Page,
  fields: Record<string, string>,
): Promise<void> {
  for (const [label, value] of Object.entries(fields)) {
    const input = page.getByLabel(new RegExp(label, 'i'))
      .or(page.getByPlaceholder(new RegExp(label, 'i')));
    await input.first().fill(value);
  }
}

// =============================================================================
// ASSERTION HELPERS
// =============================================================================

/**
 * Verifie qu'il n'y a pas de texte de debug visible.
 * STRICT: fails if [object Object] or excessive undefined/null/NaN found.
 */
export async function assertNoDebugText(page: Page): Promise<void> {
  const body = await page.textContent('body') || '';
  expect(body).not.toContain('[object Object]');
  const suspiciousPatterns = /\bundefined\b(?!.*password)|\bnull\b.*\bnull\b|\bNaN\b/g;
  const matches = body.match(suspiciousPatterns);
  expect(
    matches?.length ?? 0,
    `Debug text found in page: ${matches?.slice(0, 3).join(', ')}`,
  ).toBeLessThanOrEqual(2);
}

/**
 * Verifie que la page n'a pas d'erreur serveur visible.
 * STRICT: fails on 500 errors or empty body.
 */
export async function assertNotBroken(page: Page): Promise<void> {
  const body = await page.textContent('body') || '';
  expect(body).not.toMatch(/500|Internal Server Error|unexpected error/i);
  expect(body.length).toBeGreaterThan(50);
}

/**
 * Collecte les erreurs reseau (5xx) pendant une action.
 */
export async function collectNetworkErrors(
  page: Page,
  action: () => Promise<void>,
): Promise<string[]> {
  const errors: string[] = [];

  const handler = (response: { status: () => number; url: () => string }) => {
    if (response.status() >= 500) {
      errors.push(`${response.status()} ${response.url()}`);
    }
  };

  page.on('response', handler);
  await action();
  page.off('response', handler);

  return errors;
}

// =============================================================================
// LAYOUT HELPERS
// =============================================================================

/**
 * Dismiss the mobile sidebar if it's open.
 */
export async function dismissMobileSidebar(page: Page): Promise<void> {
  const sidebarOverlay = page.locator('div[aria-hidden="true"][role="presentation"].fixed.inset-0');
  if (await sidebarOverlay.isVisible({ timeout: 1_000 }).catch(() => false)) {
    await page.keyboard.press('Escape');
    await sidebarOverlay.waitFor({ state: 'hidden', timeout: 3_000 });
  }
}

// =============================================================================
// PLAYER HELPERS
// =============================================================================

/**
 * Verifie que le player global est visible et le retourne.
 * STRICT: fails if player is not visible.
 */
export async function assertPlayerVisible(page: Page): Promise<Locator> {
  const player = page.getByTestId('global-player')
    .or(page.locator('[role="region"][aria-label="Global player"]'));

  await expect(player.first()).toBeVisible({ timeout: CONFIG.timeouts.action });
  return player.first();
}

/**
 * Navigate to a page that displays track cards (role="article").
 * Returns true if tracks are found, false if the database has no tracks.
 * Does NOT swallow errors — navigation failures will throw.
 */
export async function navigateToPageWithTracks(page: Page): Promise<boolean> {
  await dismissMobileSidebar(page);

  // Try /feed first
  await navigateTo(page, '/feed');
  const feedTrack = page.locator('[role="article"]').first();
  if (await feedTrack.isVisible({ timeout: 5_000 }).catch(() => false)) {
    return true;
  }

  // Fallback: /discover -> click first genre
  await navigateTo(page, '/discover');
  const genreBtn = page.locator('button').filter({ has: page.locator('.font-heading.font-bold') }).first();

  if (await genreBtn.isVisible({ timeout: 5_000 }).catch(() => false)) {
    await genreBtn.click();
    await page.waitForLoadState('networkidle').catch(() => {});
    const genreTrack = page.locator('[role="article"]').first();
    if (await genreTrack.isVisible({ timeout: 5_000 }).catch(() => false)) {
      return true;
    }
  }

  return false;
}

/**
 * Lance la lecture du premier track disponible.
 * STRICT: fails if no play button is found or if it can't be clicked.
 */
export async function playFirstTrack(page: Page): Promise<void> {
  await dismissMobileSidebar(page);

  // If no track cards on current page, navigate to one that has them
  const currentTrack = page.locator('[role="article"]').first();
  if (!await currentTrack.isVisible({ timeout: 3_000 }).catch(() => false)) {
    const found = await navigateToPageWithTracks(page);
    expect(found, 'No tracks found in feed or discover — database may need seeding').toBeTruthy();
  }

  // Hover to reveal play button
  const trackCard = page.locator('[role="article"]').first();
  await expect(trackCard).toBeVisible({ timeout: CONFIG.timeouts.action });
  await trackCard.hover();
  await page.waitForTimeout(300);

  // Click play
  const playBtn = page.getByRole('button', { name: /^lire |^play /i }).first()
    .or(page.locator('[aria-label*="Lire"]').first())
    .or(page.locator('[aria-label*="Play"]').first());

  await expect(playBtn).toBeVisible({ timeout: CONFIG.timeouts.action });
  await playBtn.click();

  // Wait for player to appear
  await page.waitForTimeout(CONFIG.timeouts.animation);
}

// =============================================================================
// COMPONENT SELECTORS — Bases sur le code source reel
// =============================================================================

export const SELECTORS = {
  sidebar: '[data-testid="app-sidebar"]',
  header: 'header, [data-testid="app-header"], [role="banner"]',
  playerBar: '[data-testid="global-player"]',

  loginForm: '[data-testid="login-form"]',
  registerForm: '[data-testid="register-form"]',

  audioElement: '[data-testid="audio-element"]',
  progressBar: '[role="slider"][aria-label="Progression"]',
  volumeSlider: '[data-testid="volume-control"] [role="slider"]',

  toast: '[data-testid="toast-alert"]',
  trackCard: '[role="article"]',
  searchInput: '[data-testid="search-input"], [role="search"] input, input[type="search"], input[role="searchbox"]',
} as const;

// =============================================================================
// UTILITY
// =============================================================================

/**
 * Attend qu'un toast soit visible, puis retourne son texte.
 * STRICT: fails if no toast appears within timeout.
 */
export async function waitForToast(page: Page): Promise<string> {
  const toast = page.getByTestId('toast-alert').first();
  await expect(toast).toBeVisible({ timeout: CONFIG.timeouts.action });
  return (await toast.textContent()) || '';
}

/**
 * Genere un identifiant unique pour les donnees de test.
 */
export function testId(prefix = 'e2e'): string {
  return `${prefix}-${Date.now()}-${Math.random().toString(36).slice(2, 6)}`;
}