import { test, expect } from '@chromatic-com/playwright';
import { loginViaAPI, CONFIG, navigateTo } from './helpers';

/**
 * Visual Regression Tests @visual
 *
 * Lightweight visual regression tests that capture screenshots and verify
 * pages render correctly. Combined from:
 * - visual-complete.spec.ts
 * - visual-regression.spec.ts
 * - visual/sidebar.spec.ts
 * - visual/visual-regression.spec.ts
 */

const ANIMATION_SETTLE_MS = 800;

async function ensureDarkTheme(page: import('@playwright/test').Page) {
  await page.evaluate(() => {
    document.documentElement.classList.add('dark');
    document.documentElement.setAttribute('data-theme', 'dark');
  });
  await page.waitForTimeout(100);
}

async function disableAnimations(page: import('@playwright/test').Page) {
  await page.addStyleTag({
    content: `
      *, *::before, *::after {
        animation-duration: 0s !important;
        animation-delay: 0s !important;
        transition-duration: 0s !important;
        transition-delay: 0s !important;
      }
    `,
  });
}

/**
 * Check whether login succeeded (page is no longer on /login).
 * Returns true if authenticated, false otherwise.
 */
function isLoggedIn(page: import('@playwright/test').Page): boolean {
  return !page.url().includes('/login');
}

test.describe('VISUAL REGRESSION @visual', () => {
  test.describe('Auth Pages (unauthenticated)', () => {
    test('login page visual snapshot', async ({ page }) => {
      await page.emulateMedia({ reducedMotion: 'reduce', colorScheme: 'dark' });
      await page.goto('/login', { waitUntil: 'domcontentloaded' });
      await page.waitForLoadState('networkidle').catch(() => {});
      // Wait for the actual login form to render
      await page
        .waitForSelector('[data-testid="login-form"], input[type="email"]', { timeout: 15000 })
        .catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('login-page.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });

    test('register page visual snapshot', async ({ page }) => {
      await page.emulateMedia({ reducedMotion: 'reduce', colorScheme: 'dark' });
      await page.goto('/register', { waitUntil: 'domcontentloaded' });
      await page.waitForLoadState('networkidle').catch(() => {});
      await page
        .waitForSelector('[data-testid="register-form"], form, input[type="email"]', {
          timeout: 15000,
        })
        .catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      // Extra wait to ensure all fonts and lazy-loaded elements settle
      await page.waitForTimeout(ANIMATION_SETTLE_MS + 500);

      // Mask dynamic elements (e.g., cursor blink, timestamps) to avoid flaky diffs
      await expect(page).toHaveScreenshot('register-page.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.25,
        mask: [
          page.locator('input'),    // Mask inputs (cursor blink)
          page.locator('time'),     // Mask any time elements
        ],
      });
    });

    test('404 page visual snapshot', async ({ page }) => {
      await page.emulateMedia({ reducedMotion: 'reduce', colorScheme: 'dark' });
      await page.goto('/non-existent-route-404', { waitUntil: 'domcontentloaded' });
      await page.waitForLoadState('networkidle').catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('404-page.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });
  });

  test.describe('Authenticated Pages', () => {
    test.beforeEach(async ({ page }) => {
      await page.emulateMedia({ reducedMotion: 'reduce', colorScheme: 'dark' });
      await loginViaAPI(page, CONFIG.users.listener.email, CONFIG.users.listener.password);
    });

    test('dashboard full page', async ({ page }) => {
      await navigateTo(page, '/dashboard');
      await page.waitForSelector('main, [role="main"]', { timeout: 15000 }).catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('dashboard-full.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });

    test('dashboard header only', async ({ page }) => {
      await navigateTo(page, '/dashboard');
      const header = page.locator('header').first();
      await header.waitFor({ timeout: 15000 }).catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(header).toHaveScreenshot('dashboard-header.png', {
        maxDiffPixelRatio: 0.15,
      });
    });

    test('dashboard sidebar only', async ({ page }) => {
      await navigateTo(page, '/dashboard');
      const sidebar = page.getByTestId('app-sidebar').or(page.locator('aside')).first();
      await sidebar
        .waitFor({ state: 'visible', timeout: 15000 })
        .catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(sidebar).toHaveScreenshot('dashboard-sidebar.png', {
        maxDiffPixelRatio: 0.15,
      });
    });

    // The global player bar is always rendered (shows idle state when no track is playing).
    test('global player bar renders in idle state', async ({ page }) => {
      await navigateTo(page, '/dashboard');
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      // The player bar should always be present (idle or playing)
      const playerBar = page.getByTestId('global-player');
      await expect(playerBar).toBeVisible({ timeout: 10000 });

      await expect(playerBar).toHaveScreenshot('player-bar-idle.png', {
        maxDiffPixelRatio: 0.15,
      });
    });

    test('profile page visual snapshot', async ({ page }) => {
      await navigateTo(page, '/profile');
      await page.waitForSelector('main, [role="main"]', { timeout: 15000 }).catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('profile-page.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });

    test('playlists page visual snapshot', async ({ page }) => {
      await navigateTo(page, '/playlists');
      await page
        .waitForSelector('main, [role="main"]', { timeout: 15000 })
        .catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('playlists-page.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });

    test('tracks list page visual snapshot', async ({ page }) => {
      test.setTimeout(60_000);
      await navigateTo(page, '/tracks');
      await page.waitForSelector('main, [role="main"]', { timeout: 20000 }).catch(() => {});
      await page.waitForTimeout(3000);
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('tracks-list-page.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });

    test('library page visual snapshot', async ({ page }) => {
      await navigateTo(page, '/library');
      await page
        .waitForSelector('main, [role="main"]', { timeout: 15000 })
        .catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('library-page.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });
  });

  test.describe('Responsive Viewports', () => {
    test.beforeEach(async ({ page }) => {
      await page.emulateMedia({ reducedMotion: 'reduce', colorScheme: 'dark' });
      await loginViaAPI(page, CONFIG.users.listener.email, CONFIG.users.listener.password);
    });

    test('dashboard mobile 375x667', async ({ page }) => {
      await page.setViewportSize({ width: 375, height: 667 });
      await page.waitForTimeout(200);
      await navigateTo(page, '/dashboard');
      await page.waitForSelector('main, [role="main"]', { timeout: 15000 }).catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('dashboard-mobile.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });

    test('dashboard tablet 768x1024', async ({ page }) => {
      await page.setViewportSize({ width: 768, height: 1024 });
      await page.waitForTimeout(200);
      await navigateTo(page, '/dashboard');
      await page.waitForSelector('main, [role="main"]', { timeout: 15000 }).catch(() => {});
      await disableAnimations(page);
      await ensureDarkTheme(page);
      await page.waitForTimeout(ANIMATION_SETTLE_MS);

      await expect(page).toHaveScreenshot('dashboard-tablet.png', {
        fullPage: true,
        maxDiffPixelRatio: 0.15,
      });
    });
  });
});