/**
 * E2E tests for ObsiGate Split View (#75).
 *
 * Prerequisites:
 *   cd tests/e2e && npm install && npx playwright install chromium
 *
 * Run:
 *   OBSIGATE_URL=http://192.168.30.101:2020 npx playwright test
 *   OBSIGATE_URL=http://localhost:2021 npx playwright test --headed
 */

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

const CREDS = {
  username: process.env.OBSIGATE_USER || 'admin',
  password: process.env.OBSIGATE_PASS || 'test123',
};

async function login(page) {
  await page.goto('/');
  // Wait for login screen
  const loginForm = page.locator('#login-screen');
  await expect(loginForm).toBeVisible({ timeout: 5000 }).catch(() => {
    // Already logged in (session cookie)
  });
  if (await loginForm.isVisible()) {
    await page.fill('#login-username', CREDS.username);
    await page.fill('#login-password', CREDS.password);
    await page.click('#login-btn');
    await page.waitForSelector('#app:not(.hidden)', { timeout: 10000 });
  }
}

async function openFile(page, vault, filePath) {
  // Ouvre via l'arbre sidebar : le clic passe par TabManager (système d'onglets).
  // Le deep-link #file= ouvre l'ancien viewer sans onglets — inutilisable ici.
  // Pas de reload si déjà sur la page : un goto('/') perdrait les onglets
  // simple-pane (non restaurés depuis localStorage au chargement).
  if (!(await page.locator('#sidebar').count())) {
    await page.goto('/');
    await page.waitForTimeout(300);
  }
  const treeItem = page.locator(`.tree-item[data-vault="${vault}"][data-path="${filePath}"]`);
  if (!(await treeItem.isVisible().catch(() => false))) {
    const vaultItem = page.locator(`.vault-item[data-vault="${vault}"]`);
    if (await vaultItem.count() > 0) {
      await vaultItem.click();
      await page.waitForTimeout(700);
    }
  }
  // dblclick → openPersistent : onglet persistant (le clic simple ouvre un
  // preview qui remplace l'onglet précédent — inutilisable pour les tests multi-onglets)
  await treeItem.dblclick({ timeout: 5000 });
  await page.waitForTimeout(500);
}

async function openFileViaSidebar(page, vault, filePath) {
  // Click the file in the tree sidebar
  const treeItem = page.locator(`.tree-item[data-vault="${vault}"][data-path="${filePath}"]`);
  if (await treeItem.isVisible()) {
    await treeItem.click();
    await page.waitForTimeout(500);
  }
}

// =============================================================================
// Basic split view tests
// =============================================================================

test.describe('Split View — Basic Operations', () => {

  test.beforeEach(async ({ page }) => {
    await login(page);
  });

  test('opens single file in tab', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    // Tab should be visible
    const tabBar = page.locator('#tab-bar');
    await expect(tabBar).toBeVisible();
    const tabs = page.locator('.tab-item');
    await expect(tabs).toHaveCount(2); // navigation (racine vault) + fichier (#158)
    // Content area should show the file
    const content = page.locator('#content-area');
    await expect(content).not.toBeEmpty();
  });

  test('opens two files and shows two tabs', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await page.locator('#header-logo').click(); // go home
    await page.waitForTimeout(300);
    await openFile(page, 'TestVault', 'note2.md');
    const tabs = page.locator('.tab-item');
    await expect(tabs).toHaveCount(4); // accueil + navigation + 2 fichiers (#158)
  });

  test('split right via keyboard shortcut', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');

    // Trigger split right
    await page.keyboard.press('Control+Alt+\\');

    // Wait for pane grid to appear
    await page.waitForSelector('.pane-grid', { timeout: 3000 });
    const panes = page.locator('.pane-container');
    await expect(panes).toHaveCount(2);

    // Both panes should have content areas
    const contentAreas = page.locator('.content-area');
    await expect(contentAreas).toHaveCount(2);
  });

  test('split down via keyboard shortcut', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');

    await page.keyboard.press('Control+Alt+Shift+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });
    const panes = page.locator('.pane-container');
    await expect(panes).toHaveCount(2);
  });

  test('split right via context menu', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');

    // Right-click on tab to open context menu
    const tab = page.locator('.tab-item').first();
    await tab.click({ button: 'right' });

    // Click "Diviser à droite"
    const menuItem = page.locator('#tab-context-menu .context-menu-item', { hasText: 'Diviser à droite' });
    await expect(menuItem).toBeVisible();
    await menuItem.click();

    await page.waitForSelector('.pane-grid', { timeout: 3000 });
    const panes = page.locator('.pane-container');
    await expect(panes).toHaveCount(2);
  });

  test('closes active pane via keyboard', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });

    // Close active pane
    await page.keyboard.press('Control+Alt+w');
    await page.waitForTimeout(500);

    // Should be back to single pane
    const panes = page.locator('.pane-container');
    await expect(panes).toHaveCount(0); // collapsed to single
  });
});

// =============================================================================
// Tab drag and drop tests
// =============================================================================

test.describe('Split View — Tab Drag & Drop', () => {

  test.beforeEach(async ({ page }) => {
    await login(page);
  });

  test('drag tab from pane 0 to pane 1', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });

    // Get first tab
    const sourceTab = page.locator('.tab-item').first();

    // Get target pane's tab bar
    const targetPane = page.locator('.pane-container').nth(1);
    const targetTabBar = targetPane.locator('.tab-bar');

    // Drag tab to target
    const sourceBox = await sourceTab.boundingBox();
    const targetBox = await targetTabBar.boundingBox();

    if (sourceBox && targetBox) {
      await page.mouse.move(sourceBox.x + sourceBox.width / 2, sourceBox.y + sourceBox.height / 2);
      await page.mouse.down();
      await page.mouse.move(targetBox.x + targetBox.width / 2, targetBox.y + targetBox.height / 2, { steps: 10 });
      await page.mouse.up();
    }

    await page.waitForTimeout(500);
    // Source pane should have 1 tab, target should have 1 tab
    const pane0Tabs = page.locator('.pane-container').nth(0).locator('.tab-item');
    const pane1Tabs = page.locator('.pane-container').nth(1).locator('.tab-item');
    await expect(pane0Tabs).toHaveCount(2); // navigation + fichier (#158)
    await expect(pane1Tabs).toHaveCount(1);
  });

  test('drag tab to right edge creates split', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');

    const sourceTab = page.locator('.tab-item').first();
    const contentArea = page.locator('#content-area');

    const tabBox = await sourceTab.boundingBox();
    const areaBox = await contentArea.boundingBox();

    if (tabBox && areaBox) {
      // Start drag on tab
      await page.mouse.move(tabBox.x + tabBox.width / 2, tabBox.y + tabBox.height / 2);
      await page.mouse.down();
      // Move to right 80% of content area
      await page.mouse.move(
        areaBox.x + areaBox.width * 0.85,
        areaBox.y + areaBox.height / 2,
        { steps: 15 }
      );
      // Wait for drop zone indicator
      await page.waitForTimeout(300);
      await page.mouse.up();
    }

    await page.waitForSelector('.pane-grid', { timeout: 3000 });
    const panes = page.locator('.pane-container');
    await expect(panes).toHaveCount(2);
  });

  test('drag from tree to pane opens file there', async ({ page }) => {
    // First create split
    await openFile(page, 'TestVault', 'note1.md');
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });

    // Find a tree item
    const treeItem = page.locator('.tree-item[data-path="note2.md"]').first();
    if (await treeItem.isVisible()) {
      // Drag from tree to pane 1's content area (dragTo = drag natif HTML5)
      const targetPane = page.locator('.pane-container').nth(1);
      const targetContent = targetPane.locator('.content-area');
      try {
        await treeItem.dragTo(targetContent, { timeout: 5000 });
        await page.waitForTimeout(500);
      } catch (e) { /* drag not delivered — assertion below will fail */ }
    }

    // Pane 1 should have a tab now
    const pane1Tabs = page.locator('.pane-container').nth(1).locator('.tab-item');
    const count = await pane1Tabs.count();
    expect(count).toBeGreaterThanOrEqual(1);
  });
});

// =============================================================================
// Persistence tests
// =============================================================================

test.describe('Split View — Persistence', () => {

  test.beforeEach(async ({ page }) => {
    await login(page);
    // Clear any saved pane state
    await page.evaluate(() => localStorage.removeItem('obsigate-panes'));
  });

  test('split state persists across page reload', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });

    // Verify localStorage has pane data
    const saved = await page.evaluate(() => localStorage.getItem('obsigate-panes'));
    expect(saved).toBeTruthy();
    const data = JSON.parse(saved);
    expect(data.panes).toHaveLength(2);

    // Reload
    await page.reload();
    await login(page);
    await page.waitForTimeout(1000);

    // Should restore split
    const restored = await page.evaluate(() => localStorage.getItem('obsigate-panes'));
    if (restored) {
      const restoredData = JSON.parse(restored);
      expect(restoredData.panes.length).toBeGreaterThanOrEqual(2);
    }
  });

  test('reset panes command removes localStorage', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });

    // Open command palette and reset.
    // NB : l'input de la palette porte la CLASSE .cp-input (pas d'id) —
    // c'est ce sélecteur qui doit être utilisé.
    await page.keyboard.press('Control+Shift+Space');
    const input = page.locator('.cp-input');
    // Strict : la palette DOIT s'ouvrir avec Ctrl+Shift+Space
    await expect(input).toBeVisible({ timeout: 5000 });

    // Type ">réinitialiser" (le préfixe '>' cherche une COMMANDE,
    // sinon le palette cherche des fichiers et ne trouve pas la commande)
    await input.fill('>réinitialiser');
    // Attendre le rendu de la liste filtrée (debounce 150ms du palette)
    await page.waitForSelector('.cp-item', { timeout: 3000 });
    await page.keyboard.press('Enter');

    // localStorage should be cleared
    const cleared = await page.evaluate(() => localStorage.getItem('obsigate-panes'));
    expect(cleared).toBeNull();
  });
});

// =============================================================================
// Regression tests
// =============================================================================

test.describe('Split View — Regression', () => {

  test.beforeEach(async ({ page }) => {
    await login(page);
    await page.evaluate(() => localStorage.removeItem('obsigate-panes'));
  });

  test('single pane mode works identically to before', async ({ page }) => {
    // In single-pane mode, everything should use #content-area
    await openFile(page, 'TestVault', 'note1.md');

    const contentArea = page.locator('#content-area');
    await expect(contentArea).toBeVisible();
    await expect(contentArea).not.toBeEmpty();

    // No pane grid should exist
    const paneGrid = page.locator('.pane-grid');
    await expect(paneGrid).toHaveCount(0);

    // Tab bar should show #tab-list
    const tabList = page.locator('#tab-list');
    await expect(tabList).toBeVisible();
  });

  test('closing last tab shows dashboard', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md'); // ouvre aussi l'onglet navigation (#158)

    // Close tabs via middle-click until none remains (dernier onglet -> dashboard)
    while (await page.locator('.tab-item').count()) {
      await page.locator('.tab-item').first().click({ button: 'middle' });
      await page.waitForTimeout(300);
    }

    // Dashboard should be visible
    const dashboard = page.locator('#dashboard-home');
    await expect(dashboard).toBeVisible();

    // Tab bar should be hidden
    const tabBar = page.locator('#tab-bar');
    await expect(tabBar).toBeHidden();
  });

  test('bookmark click opens file in tab system', async ({ page }) => {
    // First bookmark a file for the test
    await openFile(page, 'TestVault', 'note1.md');

    // Go home
    await page.locator('#header-logo').click();
    await page.waitForTimeout(500);

    // If bookmark card exists, click it
    const bookmarkGrid = page.locator('#dashboard-bookmarks-grid');
    if (await bookmarkGrid.isVisible()) {
      const cards = bookmarkGrid.locator('.dashboard-card');
      const count = await cards.count();
      if (count > 0) {
        await cards.first().click();
        await page.waitForTimeout(500);
        // Should have opened in a tab
        const tabs = page.locator('.tab-item');
        await expect(tabs).toHaveCount(1);
      }
    }
  });
});

// =============================================================================
// Keyboard navigation tests
// =============================================================================

test.describe('Split View — Keyboard Navigation', () => {

  test.beforeEach(async ({ page }) => {
    await login(page);
    await page.evaluate(() => localStorage.removeItem('obsigate-panes'));
  });

  test('navigate between panes with Ctrl+Alt+Arrow', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });
    // Laisser la copie asynchrone de l'onglet actif se terminer (setTimeout 150ms
    // dans _copyActiveTabToNewPane) — sinon elle réactive le pane 0 après la navigation.
    await page.waitForTimeout(600);

    // Pane 0 should be active initially
    const pane0 = page.locator('.pane-container').nth(0);
    await expect(pane0).toHaveClass(/pane-active/);

    // Navigate right
    await page.keyboard.press('Control+Alt+ArrowRight');
    await page.waitForTimeout(300);

    // Pane 1 should now be active
    const pane1 = page.locator('.pane-container').nth(1);
    await expect(pane1).toHaveClass(/pane-active/);

    // Navigate left back
    await page.keyboard.press('Control+Alt+ArrowLeft');
    await page.waitForTimeout(300);
    await expect(pane0).toHaveClass(/pane-active/);
  });

  test('close other panes with Ctrl+Shift+Alt+W', async ({ page }) => {
    await openFile(page, 'TestVault', 'note1.md');
    await openFile(page, 'TestVault', 'note2.md');
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForSelector('.pane-grid', { timeout: 3000 });

    // Create a third pane
    await page.keyboard.press('Control+Alt+\\');
    await page.waitForTimeout(500);

    let panes = page.locator('.pane-container');
    const initialCount = await panes.count();
    expect(initialCount).toBeGreaterThanOrEqual(2);

    // Close other panes
    await page.keyboard.press('Control+Shift+Alt+w');
    await page.waitForTimeout(500);

    // Should be back to single pane
    panes = page.locator('.pane-container');
    await expect(panes).toHaveCount(0);
  });
});