import { test, expect, Page } from "@playwright/test";

// Helper to generate unique email for each test
function uniqueEmail(): string {
  return `test-${Date.now()}-${Math.random().toString(36).substring(7)}@example.com`;
}

// Helper to clear auth cookies
async function clearAuth(page: Page) {
  await page.context().clearCookies();
}

test.describe("Authentication Flow", () => {
  test.beforeEach(async ({ page }) => {
    await clearAuth(page);
  });

  test("redirects to login when not authenticated", async ({ page }) => {
    await page.goto("/");
    await expect(page).toHaveURL("/login");
  });

  test("login page has correct form elements", async ({ page }) => {
    await page.goto("/login");
    await expect(page.locator("h1")).toHaveText("Welcome back");
    await expect(page.locator('input[type="email"]')).toBeVisible();
    await expect(page.locator('input[type="password"]')).toBeVisible();
    await expect(page.locator('button[type="submit"]')).toHaveText("Sign in");
    await expect(page.locator('a[href="/signup"]')).toBeVisible();
  });

  test("signup page has correct form elements", async ({ page }) => {
    await page.goto("/signup");
    await expect(page.locator("h1")).toHaveText("Create account");
    await expect(page.locator('input[type="email"]')).toBeVisible();
    await expect(page.locator('input[type="password"]').first()).toBeVisible();
    await expect(page.locator('input[type="password"]').nth(1)).toBeVisible();
    await expect(page.locator('button[type="submit"]')).toHaveText("Create account");
    await expect(page.locator('a[href="/login"]')).toBeVisible();
  });

  test("can navigate from login to signup", async ({ page }) => {
    await page.goto("/login");
    await page.click('a[href="/signup"]');
    await expect(page).toHaveURL("/signup");
  });

  test("can navigate from signup to login", async ({ page }) => {
    await page.goto("/signup");
    await page.click('a[href="/login"]');
    await expect(page).toHaveURL("/login");
  });
});

test.describe("Signup", () => {
  test.beforeEach(async ({ page }) => {
    await clearAuth(page);
  });

  test("can create a new account", async ({ page }) => {
    const email = uniqueEmail();

    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');

    // Should redirect to home after signup
    await expect(page).toHaveURL("/");
    // Should show user email
    await expect(page.getByText(email)).toBeVisible();
  });

  test("shows error for duplicate email", async ({ page }) => {
    const email = uniqueEmail();

    // First registration
    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');
    await expect(page).toHaveURL("/");

    // Clear cookies and try again with same email
    await clearAuth(page);
    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');

    // Should show error
    await expect(page.getByText("Email already registered")).toBeVisible();
  });

  test("shows error for password mismatch", async ({ page }) => {
    await page.goto("/signup");
    await page.fill('input[type="email"]', uniqueEmail());
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("differentpassword");
    await page.click('button[type="submit"]');

    await expect(page.getByText("Passwords do not match")).toBeVisible();
  });

  test("shows error for short password", async ({ page }) => {
    await page.goto("/signup");
    await page.fill('input[type="email"]', uniqueEmail());
    await page.fill('input[type="password"]', "short");
    await page.locator('input[type="password"]').nth(1).fill("short");
    await page.click('button[type="submit"]');

    await expect(page.getByText("Password must be at least 6 characters")).toBeVisible();
  });

  test("shows loading state while submitting", async ({ page }) => {
    await page.goto("/signup");
    await page.fill('input[type="email"]', uniqueEmail());
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");

    // Start submission and check for loading state
    const submitPromise = page.click('button[type="submit"]');
    await expect(page.locator('button[type="submit"]')).toHaveText("Creating account...");
    await submitPromise;
  });
});

test.describe("Login", () => {
  const testEmail = `login-test-${Date.now()}@example.com`;
  const testPassword = "testpassword123";

  test.beforeAll(async ({ browser }) => {
    // Create a test user
    const page = await browser.newPage();
    await page.goto("/signup");
    await page.fill('input[type="email"]', testEmail);
    await page.fill('input[type="password"]', testPassword);
    await page.locator('input[type="password"]').nth(1).fill(testPassword);
    await page.click('button[type="submit"]');
    await expect(page).toHaveURL("/");
    await page.close();
  });

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

  test("can login with valid credentials", async ({ page }) => {
    await page.goto("/login");
    await page.fill('input[type="email"]', testEmail);
    await page.fill('input[type="password"]', testPassword);
    await page.click('button[type="submit"]');

    await expect(page).toHaveURL("/");
    await expect(page.getByText(testEmail)).toBeVisible();
  });

  test("shows error for wrong password", async ({ page }) => {
    await page.goto("/login");
    await page.fill('input[type="email"]', testEmail);
    await page.fill('input[type="password"]', "wrongpassword");
    await page.click('button[type="submit"]');

    await expect(page.getByText("Incorrect email or password")).toBeVisible();
  });

  test("shows error for non-existent user", async ({ page }) => {
    await page.goto("/login");
    await page.fill('input[type="email"]', "nonexistent@example.com");
    await page.fill('input[type="password"]', "password123");
    await page.click('button[type="submit"]');

    await expect(page.getByText("Incorrect email or password")).toBeVisible();
  });

  test("shows loading state while submitting", async ({ page }) => {
    await page.goto("/login");
    await page.fill('input[type="email"]', testEmail);
    await page.fill('input[type="password"]', testPassword);

    const submitPromise = page.click('button[type="submit"]');
    await expect(page.locator('button[type="submit"]')).toHaveText("Signing in...");
    await submitPromise;
  });
});

test.describe("Logout", () => {
  test("can logout", async ({ page }) => {
    const email = uniqueEmail();

    // Sign up first
    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');
    await expect(page).toHaveURL("/");

    // Click logout
    await page.click("text=Sign out");

    // Should redirect to login
    await expect(page).toHaveURL("/login");
  });

  test("cannot access home after logout", async ({ page }) => {
    const email = uniqueEmail();

    // Sign up
    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');
    await expect(page).toHaveURL("/");

    // Logout
    await page.click("text=Sign out");
    await expect(page).toHaveURL("/login");

    // Try to access home
    await page.goto("/");
    await expect(page).toHaveURL("/login");
  });
});

test.describe("Session Persistence", () => {
  test("session persists after page reload", async ({ page }) => {
    const email = uniqueEmail();

    // Sign up
    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');
    await expect(page).toHaveURL("/");
    await expect(page.getByText(email)).toBeVisible();

    // Reload page
    await page.reload();

    // Should still be logged in
    await expect(page).toHaveURL("/");
    await expect(page.getByText(email)).toBeVisible();
  });

  test("auth cookie is set after login", async ({ page }) => {
    const email = uniqueEmail();

    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');
    await expect(page).toHaveURL("/");

    // Check cookies
    const cookies = await page.context().cookies();
    const authCookie = cookies.find((c) => c.name === "auth_token");
    expect(authCookie).toBeTruthy();
    expect(authCookie!.httpOnly).toBe(true);
  });

  test("auth cookie is cleared on logout", async ({ page }) => {
    const email = uniqueEmail();

    await page.goto("/signup");
    await page.fill('input[type="email"]', email);
    await page.fill('input[type="password"]', "password123");
    await page.locator('input[type="password"]').nth(1).fill("password123");
    await page.click('button[type="submit"]');
    await expect(page).toHaveURL("/");

    await page.click("text=Sign out");
    // Wait for navigation to complete - ensures the logout request finished
    // and the Set-Cookie header was processed by the browser
    await expect(page).toHaveURL("/login");

    const cookies = await page.context().cookies();
    const authCookie = cookies.find((c) => c.name === "auth_token");
    // Cookie should be deleted or have empty value
    expect(!authCookie || authCookie.value === "").toBe(true);
  });
});