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

/**
 * Permission-based E2E tests
 *
 * These tests verify that:
 * 1. Regular users can only access Counter and Sum pages
 * 2. Admin users can only access the Audit page
 * 3. Users are properly redirected based on their permissions
 * 4. API calls respect permission boundaries
 */

const API_URL = process.env.NEXT_PUBLIC_API_URL || "http://localhost:8000";

// Test credentials - must match what's seeded in the database via seed.py
// These come from environment variables DEV_USER_EMAIL/PASSWORD and DEV_ADMIN_EMAIL/PASSWORD
// Tests will fail fast if these are not set
function getRequiredEnv(name: string): string {
  const value = process.env[name];
  if (!value) {
    throw new Error(
      `Required environment variable ${name} is not set. Run 'source .env' or set it in your environment.`
    );
  }
  return value;
}

const REGULAR_USER = {
  email: getRequiredEnv("DEV_USER_EMAIL"),
  password: getRequiredEnv("DEV_USER_PASSWORD"),
};

const ADMIN_USER = {
  email: getRequiredEnv("DEV_ADMIN_EMAIL"),
  password: getRequiredEnv("DEV_ADMIN_PASSWORD"),
};

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

// Helper to login a user
async function loginUser(page: Page, email: string, password: string) {
  await page.goto("/login");
  await page.fill('input[type="email"]', email);
  await page.fill('input[type="password"]', password);
  await page.click('button[type="submit"]');
  // Wait for navigation away from login page
  await page.waitForURL((url) => !url.pathname.includes("/login"), { timeout: 10000 });
}

// Setup: Users are pre-seeded via seed.py before e2e tests run
// The seed script creates:
// - A regular user (DEV_USER_EMAIL/PASSWORD) with "regular" role
// - An admin user (DEV_ADMIN_EMAIL/PASSWORD) with "admin" role
test.beforeAll(async () => {
  // No need to create users - they are seeded by scripts/e2e.sh
});

test.describe("Regular User Access", () => {
  test.beforeEach(async ({ page }) => {
    await clearAuth(page);
    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);
  });

  test("can access counter page", async ({ page }) => {
    await page.goto("/");

    // Should stay on counter page
    await expect(page).toHaveURL("/");

    // Should see counter UI
    await expect(page.getByText("Current Count")).toBeVisible();
    await expect(page.getByRole("button", { name: /increment/i })).toBeVisible();
  });

  test("can access sum page", async ({ page }) => {
    await page.goto("/sum");

    // Should stay on sum page
    await expect(page).toHaveURL("/sum");

    // Should see sum UI
    await expect(page.getByText("Sum Calculator")).toBeVisible();
  });

  test("cannot access audit page - redirected to counter", async ({ page }) => {
    await page.goto("/audit");

    // Should be redirected to counter page (home)
    await expect(page).toHaveURL("/");
  });

  test("navigation only shows Counter and Sum", async ({ page }) => {
    await page.goto("/");

    // Should see Counter and Sum in nav
    await expect(page.getByText("Counter")).toBeVisible();
    await expect(page.getByText("Sum")).toBeVisible();

    // Should NOT see Audit in nav (for regular users)
    const auditLinks = page.locator('a[href="/audit"]');
    await expect(auditLinks).toHaveCount(0);
  });

  test("can navigate between Counter and Sum", async ({ page }) => {
    await page.goto("/");

    // Go to Sum
    await page.click('a[href="/sum"]');
    await expect(page).toHaveURL("/sum");

    // Go back to Counter
    await page.click('a[href="/"]');
    await expect(page).toHaveURL("/");
  });

  test("can use counter functionality", async ({ page }) => {
    await page.goto("/");

    // Get initial count (might be any number)
    const countElement = page.locator("h1").first();
    await expect(countElement).toBeVisible();

    // Click increment
    await page.click('button:has-text("Increment")');

    // Wait for update
    await page.waitForTimeout(500);

    // Counter should have updated (we just verify no error occurred)
    await expect(countElement).toBeVisible();
  });

  test("can use sum functionality", async ({ page }) => {
    await page.goto("/sum");

    // Fill in numbers
    await page.fill('input[aria-label="First number"]', "5");
    await page.fill('input[aria-label="Second number"]', "3");

    // Calculate
    await page.click('button:has-text("Calculate")');

    // Should show result
    await expect(page.getByText("8")).toBeVisible();
  });
});

test.describe("Admin User Access", () => {
  test.beforeEach(async ({ page }) => {
    await clearAuth(page);
    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);
  });

  test("redirected from counter page to audit", async ({ page }) => {
    await page.goto("/");

    // Should be redirected to audit page
    await expect(page).toHaveURL("/audit");
  });

  test("redirected from sum page to audit", async ({ page }) => {
    await page.goto("/sum");

    // Should be redirected to audit page
    await expect(page).toHaveURL("/audit");
  });

  test("can access audit page", async ({ page }) => {
    await page.goto("/audit");

    // Should stay on audit page
    await expect(page).toHaveURL("/audit");

    // Should see audit tables
    await expect(page.getByText("Counter Activity")).toBeVisible();
    await expect(page.getByText("Sum Activity")).toBeVisible();
  });

  test("navigation only shows Audit", async ({ page }) => {
    await page.goto("/audit");

    // Should see Audit as current
    await expect(page.getByText("Audit")).toBeVisible();

    // Should NOT see Counter or Sum links (for admin users)
    const counterLinks = page.locator('a[href="/"]');
    const sumLinks = page.locator('a[href="/sum"]');
    await expect(counterLinks).toHaveCount(0);
    await expect(sumLinks).toHaveCount(0);
  });

  test("audit page shows records", async ({ page }) => {
    await page.goto("/audit");

    // Should see the tables
    await expect(page.getByRole("table")).toHaveCount(2);

    // Should see column headers (use first() since there are two tables with same headers)
    await expect(page.getByRole("columnheader", { name: "User" }).first()).toBeVisible();
    await expect(page.getByRole("columnheader", { name: "Date" }).first()).toBeVisible();
  });
});

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

  test("counter page redirects to login", async ({ page }) => {
    await page.goto("/");
    await expect(page).toHaveURL("/login");
  });

  test("sum page redirects to login", async ({ page }) => {
    await page.goto("/sum");
    await expect(page).toHaveURL("/login");
  });

  test("audit page redirects to login", async ({ page }) => {
    await page.goto("/audit");
    await expect(page).toHaveURL("/login");
  });
});

test.describe("Permission Boundary via API", () => {
  test("regular user API call to audit returns 403", async ({ page, request }) => {
    // Login as regular user
    await clearAuth(page);
    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);

    // Get cookies
    const cookies = await page.context().cookies();
    const authCookie = cookies.find((c) => c.name === "auth_token");

    if (authCookie) {
      // Try to call audit API directly
      const response = await request.get(`${API_URL}/api/audit/counter`, {
        headers: {
          Cookie: `auth_token=${authCookie.value}`,
        },
      });

      expect(response.status()).toBe(403);
    }
  });

  test("admin user API call to counter returns 403", async ({ page, request }) => {
    // Login as admin
    await clearAuth(page);
    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);

    // Get cookies
    const cookies = await page.context().cookies();
    const authCookie = cookies.find((c) => c.name === "auth_token");

    if (authCookie) {
      // Try to call counter API directly
      const response = await request.get(`${API_URL}/api/counter`, {
        headers: {
          Cookie: `auth_token=${authCookie.value}`,
        },
      });

      expect(response.status()).toBe(403);
    }
  });
});

test.describe("Session and Logout", () => {
  test("logout clears permissions - cannot access protected pages", async ({ page }) => {
    // Login
    await clearAuth(page);
    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);
    await expect(page).toHaveURL("/");

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

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

  test("cannot access pages with tampered cookie", async ({ page, context }) => {
    // Set a fake auth cookie
    await context.addCookies([
      {
        name: "auth_token",
        value: "fake-token-that-should-not-work",
        domain: "localhost",
        path: "/",
      },
    ]);

    // Try to access protected page
    await page.goto("/");

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