import { test, expect } from '@playwright/test';
import { E2E_BACKEND_URL } from '../playwright.config';

// Helper to create a tmux session via API
async function createTmuxSession(request: import('@playwright/test').APIRequestContext) {
  const res = await request.post(`${E2E_BACKEND_URL}/api/sessions`, {
    data: { provider: 'tmux' }
  });
  expect(res.ok()).toBeTruthy();
  return await res.json();
}

// Helper to delete a session
async function deleteSession(request: import('@playwright/test').APIRequestContext, sessionId: string) {
  try {
    await request.delete(`${E2E_BACKEND_URL}/api/sessions/${encodeURIComponent(sessionId)}`);
  } catch (e) {
    console.log(`[Cleanup] Failed to delete session ${sessionId}:`, e);
  }
}

// Helper to wait for tmux session to load
async function waitForTmuxSession(page: import('@playwright/test').Page) {
  // Wait for terminal badge to appear
  await expect(page.locator('text=TERMINAL')).toBeVisible({ timeout: 10000 });
}

// Helper to click a session card by ID (triggers client-side navigation)
async function clickSessionById(page: import('@playwright/test').Page, sessionId: string) {
  const card = page.locator(`a[href="/session/${encodeURIComponent(sessionId)}"]`);
  await expect(card).toBeVisible({ timeout: 10000 });
  await card.click();
}

// Helper to go back to home via the back button (client-side navigation)
async function goBackToHome(page: import('@playwright/test').Page) {
  const backBtn = page.locator('button[aria-label="Go back"]');
  await expect(backBtn).toBeVisible();
  await backBtn.click();
  await expect(page).toHaveTitle(/Spiceflow/i);
}

test.describe('Last Session Navigation', () => {
  test('navigating between sessions shows last session button', async ({ page, request }) => {
    // Create two sessions
    const sessionA = await createTmuxSession(request);
    const sessionB = await createTmuxSession(request);

    try {
      // Start at home page and wait for sessions to load
      await page.goto('/');
      await expect(page).toHaveTitle(/Spiceflow/i);
      await expect(page.locator('a[href^="/session/"]').first()).toBeVisible({ timeout: 10000 });

      // Click session A (client-side navigation)
      await clickSessionById(page, sessionA.id);
      await waitForTmuxSession(page);

      // Last session button should NOT be visible (no previous session)
      await expect(page.locator('button[title="Go to last session"]')).not.toBeVisible();

      // Go back to home
      await goBackToHome(page);

      // Click session B (client-side navigation, sets lastSession = A)
      await clickSessionById(page, sessionB.id);
      await waitForTmuxSession(page);

      // Last session button SHOULD be visible now (previous was A)
      const lastSessionBtn = page.locator('button[title="Go to last session"]');
      await expect(lastSessionBtn).toBeVisible({ timeout: 5000 });

      // Click it to go back to A
      await lastSessionBtn.click();
      await waitForTmuxSession(page);

      // Verify we're on session A
      await expect(page).toHaveURL(new RegExp(`/session/${encodeURIComponent(sessionA.id)}`));

      // Now last session should still be visible (pointing to B)
      await expect(lastSessionBtn).toBeVisible({ timeout: 5000 });

    } finally {
      await deleteSession(request, sessionA.id);
      await deleteSession(request, sessionB.id);
    }
  });

  test('going home and re-entering same session preserves last session', async ({ page, request }) => {
    // Create two sessions
    const sessionA = await createTmuxSession(request);
    const sessionB = await createTmuxSession(request);

    try {
      // Start at home page
      await page.goto('/');
      await expect(page.locator('a[href^="/session/"]').first()).toBeVisible({ timeout: 10000 });

      // Click session A, then back to home, then click session B
      await clickSessionById(page, sessionA.id);
      await waitForTmuxSession(page);
      await goBackToHome(page);

      await clickSessionById(page, sessionB.id);
      await waitForTmuxSession(page);

      // Verify last session button is visible (points to A)
      const lastSessionBtn = page.locator('button[title="Go to last session"]');
      await expect(lastSessionBtn).toBeVisible({ timeout: 5000 });

      // Go back to home
      await goBackToHome(page);

      // Re-enter session B (same session)
      await clickSessionById(page, sessionB.id);
      await waitForTmuxSession(page);

      // Last session button should STILL be visible and point to A
      // (re-entering same session should NOT override the last session)
      await expect(lastSessionBtn).toBeVisible({ timeout: 5000 });

      // Click it to verify it goes to A
      await lastSessionBtn.click();
      await waitForTmuxSession(page);
      await expect(page).toHaveURL(new RegExp(`/session/${encodeURIComponent(sessionA.id)}`));

    } finally {
      await deleteSession(request, sessionA.id);
      await deleteSession(request, sessionB.id);
    }
  });

  test('last session button not shown when it equals current session', async ({ page, request }) => {
    // Create two sessions
    const sessionA = await createTmuxSession(request);
    const sessionB = await createTmuxSession(request);

    try {
      // Start at home
      await page.goto('/');
      await expect(page.locator('a[href^="/session/"]').first()).toBeVisible({ timeout: 10000 });

      // Go A -> home -> B (sets localStorage to A)
      await clickSessionById(page, sessionA.id);
      await waitForTmuxSession(page);
      await goBackToHome(page);

      await clickSessionById(page, sessionB.id);
      await waitForTmuxSession(page);

      // Go back to home
      await goBackToHome(page);

      // Now go to A (localStorage still has A, which equals current)
      await clickSessionById(page, sessionA.id);
      await waitForTmuxSession(page);

      // Last session button should NOT be visible (lastSession = current session = A)
      await expect(page.locator('button[title="Go to last session"]')).not.toBeVisible();

    } finally {
      await deleteSession(request, sessionA.id);
      await deleteSession(request, sessionB.id);
    }
  });

  test('last session via settings menu works', async ({ page, request }) => {
    // Create two sessions
    const sessionA = await createTmuxSession(request);
    const sessionB = await createTmuxSession(request);

    try {
      // Start at home
      await page.goto('/');
      await expect(page.locator('a[href^="/session/"]').first()).toBeVisible({ timeout: 10000 });

      // Navigate A -> home -> B
      await clickSessionById(page, sessionA.id);
      await waitForTmuxSession(page);
      await goBackToHome(page);

      await clickSessionById(page, sessionB.id);
      await waitForTmuxSession(page);

      // Open settings menu
      const settingsBtn = page.locator('button[aria-label="Session settings"]');
      await expect(settingsBtn).toBeVisible();
      await settingsBtn.click();

      // Click "Last session" in the menu
      const lastSessionMenuItem = page.locator('button:has-text("Last session")');
      await expect(lastSessionMenuItem).toBeVisible({ timeout: 5000 });
      await lastSessionMenuItem.click();

      // Should navigate to A
      await waitForTmuxSession(page);
      await expect(page).toHaveURL(new RegExp(`/session/${encodeURIComponent(sessionA.id)}`));

    } finally {
      await deleteSession(request, sessionA.id);
      await deleteSession(request, sessionB.id);
    }
  });

  // Skip: tmux session deletion/validation has timing issues in tests
  test.skip('deleting last session clears the reference', async ({ page, request }) => {
    // Create two sessions
    const sessionA = await createTmuxSession(request);
    const sessionB = await createTmuxSession(request);

    try {
      // Start at home
      await page.goto('/');
      await expect(page.locator('a[href^="/session/"]').first()).toBeVisible({ timeout: 10000 });

      // Navigate A -> home -> B
      await clickSessionById(page, sessionA.id);
      await waitForTmuxSession(page);
      await goBackToHome(page);

      await clickSessionById(page, sessionB.id);
      await waitForTmuxSession(page);

      // Last session button should be visible
      const lastSessionBtn = page.locator('button[title="Go to last session"]');
      await expect(lastSessionBtn).toBeVisible({ timeout: 5000 });

      // Delete session A via API
      await deleteSession(request, sessionA.id);

      // Go home and wait for session A to disappear from the list
      await goBackToHome(page);
      await expect(page.locator(`a[href="/session/${encodeURIComponent(sessionA.id)}"]`)).not.toBeVisible({ timeout: 10000 });

      // Go back to B
      await clickSessionById(page, sessionB.id);
      await waitForTmuxSession(page);

      // Last session button should NOT be visible (A was deleted)
      await expect(lastSessionBtn).not.toBeVisible({ timeout: 5000 });

    } finally {
      await deleteSession(request, sessionB.id);
    }
  });
});