import { test, expect, Page } from "@playwright/test";
import { formatDateLocal, getTomorrowDateStr } from "./helpers/date";

/**
 * Booking Page E2E Tests
 * 
 * Tests for the user booking page.
 */

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

function getRequiredEnv(name: string): string {
  const value = process.env[name];
  if (!value) {
    throw new Error(`Required environment variable ${name} is not set.`);
  }
  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"),
};

async function clearAuth(page: Page) {
  await page.context().clearCookies();
}

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"]');
  await page.waitForURL((url) => !url.pathname.includes("/login"), { timeout: 10000 });
}

// Set up availability for a date using the API with retry logic
async function setAvailability(page: Page, dateStr: string, maxRetries = 3) {
  const cookies = await page.context().cookies();
  const authCookie = cookies.find(c => c.name === "auth_token");
  
  if (!authCookie) {
    throw new Error("No auth cookie found when trying to set availability");
  }
  
  let lastError: Error | null = null;
  
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    if (attempt > 0) {
      // Wait before retry
      await page.waitForTimeout(500);
    }
    
    const response = await page.request.put(`${API_URL}/api/admin/availability`, {
      headers: {
        Cookie: `auth_token=${authCookie.value}`,
        "Content-Type": "application/json",
      },
      data: {
        date: dateStr,
        slots: [{ start_time: "09:00:00", end_time: "12:00:00" }],
      },
    });
    
    if (response.ok()) {
      return; // Success
    }
    
    const body = await response.text();
    lastError = new Error(`Failed to set availability: ${response.status()} - ${body}`);
    
    // Only retry on 500 errors
    if (response.status() !== 500) {
      throw lastError;
    }
  }
  
  throw lastError;
}

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

  test("regular user can access booking page", async ({ page }) => {
    await page.goto("/booking");
    
    await expect(page).toHaveURL("/booking");
    await expect(page.getByRole("heading", { name: "Book an Appointment" })).toBeVisible();
  });

  test("regular user sees Book link in navigation", async ({ page }) => {
    await page.goto("/");
    
    await expect(page.getByRole("link", { name: "Book" })).toBeVisible();
  });

  test("booking page shows date selection", async ({ page }) => {
    await page.goto("/booking");
    
    await expect(page.getByRole("heading", { name: "Select a Date" })).toBeVisible();
    // Should see multiple date buttons
    const dateButtons = page.locator("button").filter({ hasText: /^(Mon|Tue|Wed|Thu|Fri|Sat|Sun)/ });
    await expect(dateButtons.first()).toBeVisible();
  });

  test("selecting date shows slots section", async ({ page }) => {
    await page.goto("/booking");
    
    // Click first date button
    const dateButton = page.locator("button").filter({ hasText: /^(Mon|Tue|Wed|Thu|Fri|Sat|Sun)/ }).first();
    await dateButton.click();
    
    // Should show Available Slots section (use heading to be specific)
    await expect(page.getByRole("heading", { name: /Available Slots for/ })).toBeVisible();
  });

  test("shows no slots or message when no availability", async ({ page }) => {
    await page.goto("/booking");
    
    // Click a date button - pick a date far in the future to avoid any set availability
    const dateButtons = page.locator("button").filter({ hasText: /^(Mon|Tue|Wed|Thu|Fri|Sat|Sun)/ });
    // Click the last date button (30 days out, unlikely to have availability)
    await dateButtons.last().click();
    
    // Wait for the section to appear
    await expect(page.getByRole("heading", { name: /Available Slots for/ })).toBeVisible();
    
    // Should either show no slots message OR show no slot buttons
    // Wait a moment for API to return
    await page.waitForTimeout(1000);
    
    // If no availability is set, we'll see the "No available slots" message
    const noSlotsMessage = page.getByText("No available slots for this date");
    const isNoSlotsVisible = await noSlotsMessage.isVisible().catch(() => false);
    
    if (!isNoSlotsVisible) {
      // There might be some slots from shared state - just verify the section loads
      await expect(page.getByRole("heading", { name: /Available Slots for/ })).toBeVisible();
    }
  });
});

test.describe("Booking Page - With Availability", () => {
  test.beforeEach(async ({ page }) => {
    await clearAuth(page);
    // Login as admin to set availability
    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);
    await setAvailability(page, getTomorrowDateStr());
    await clearAuth(page);
    // Login as regular user
    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);
  });

  test("shows available slots when availability is set", async ({ page }) => {
    await page.goto("/booking");
    
    // Get tomorrow's display name to click the correct button
    const tomorrow = new Date();
    tomorrow.setDate(tomorrow.getDate() + 1);
    const weekday = tomorrow.toLocaleDateString("en-US", { weekday: "short" });
    
    // Click tomorrow's date using the weekday name
    const dateButton = page.locator("button").filter({ hasText: new RegExp(`^${weekday}`) }).first();
    await dateButton.click();
    
    // Wait for "Available Slots" section to appear
    await expect(page.getByRole("heading", { name: /Available Slots for/ })).toBeVisible();
    
    // Wait for loading to finish (no "Loading slots..." text)
    await expect(page.getByText("Loading slots...")).not.toBeVisible({ timeout: 10000 });
    
    // Should see some slot buttons (look for any button with time-like pattern)
    // The format might be "09:00" or "9:00 AM" depending on locale
    const slotButtons = page.locator("button").filter({ hasText: /^\d{1,2}:\d{2}/ });
    await expect(slotButtons.first()).toBeVisible({ timeout: 10000 });
  });

  test("clicking slot shows confirmation form", async ({ page }) => {
    await page.goto("/booking");
    
    // Get tomorrow's display name
    const tomorrow = new Date();
    tomorrow.setDate(tomorrow.getDate() + 1);
    const weekday = tomorrow.toLocaleDateString("en-US", { weekday: "short" });
    
    // Click tomorrow's date
    const dateButton = page.locator("button").filter({ hasText: new RegExp(`^${weekday}`) }).first();
    await dateButton.click();
    
    // Wait for any slot to appear
    await expect(page.getByText("Loading slots...")).not.toBeVisible({ timeout: 10000 });
    const slotButtons = page.locator("button").filter({ hasText: /^\d{1,2}:\d{2}/ });
    await expect(slotButtons.first()).toBeVisible({ timeout: 10000 });
    
    // Click first slot
    await slotButtons.first().click();
    
    // Should show confirmation form
    await expect(page.getByText("Confirm Booking")).toBeVisible();
    await expect(page.getByRole("button", { name: "Book Appointment" })).toBeVisible();
  });

  test("can book an appointment with note", async ({ page }) => {
    await page.goto("/booking");
    
    // Get tomorrow's display name
    const tomorrow = new Date();
    tomorrow.setDate(tomorrow.getDate() + 1);
    const weekday = tomorrow.toLocaleDateString("en-US", { weekday: "short" });
    
    // Click tomorrow's date
    const dateButton = page.locator("button").filter({ hasText: new RegExp(`^${weekday}`) }).first();
    await dateButton.click();
    
    // Wait for slots to load
    await expect(page.getByText("Loading slots...")).not.toBeVisible({ timeout: 10000 });
    const slotButtons = page.locator("button").filter({ hasText: /^\d{1,2}:\d{2}/ });
    await expect(slotButtons.first()).toBeVisible({ timeout: 10000 });
    
    // Click second slot (to avoid booking same slot as other tests)
    await slotButtons.nth(1).click();
    
    // Add a note
    await page.fill("textarea", "Test booking note");
    
    // Book
    await page.getByRole("button", { name: "Book Appointment" }).click();
    
    // Should show success message
    await expect(page.getByText(/Appointment booked/)).toBeVisible();
  });

  test("booked slot disappears from available slots", async ({ page }) => {
    await page.goto("/booking");
    
    // Get tomorrow's display name
    const tomorrow = new Date();
    tomorrow.setDate(tomorrow.getDate() + 1);
    const weekday = tomorrow.toLocaleDateString("en-US", { weekday: "short" });
    
    // Click tomorrow's date
    const dateButton = page.locator("button").filter({ hasText: new RegExp(`^${weekday}`) }).first();
    await dateButton.click();
    
    // Wait for slots to load
    await expect(page.getByText("Loading slots...")).not.toBeVisible({ timeout: 10000 });
    const slotButtons = page.locator("button").filter({ hasText: /^\d{1,2}:\d{2}/ });
    await expect(slotButtons.first()).toBeVisible({ timeout: 10000 });
    
    // Count initial slots
    const initialCount = await slotButtons.count();
    
    // Click any slot (3rd to avoid conflicts)
    const slotToBook = slotButtons.nth(2);
    const slotText = await slotToBook.textContent();
    await slotToBook.click();
    
    // Book it
    await page.getByRole("button", { name: "Book Appointment" }).click();
    
    // Wait for success
    await expect(page.getByText(/Appointment booked/)).toBeVisible();
    
    // Should have one less slot now
    const newCount = await slotButtons.count();
    expect(newCount).toBe(initialCount - 1);
  });
});

test.describe("Booking Page - Access Control", () => {
  test("admin cannot access booking page", async ({ page }) => {
    await clearAuth(page);
    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);
    
    await page.goto("/booking");
    
    // Should be redirected away (to audit or home)
    await expect(page).not.toHaveURL("/booking");
  });

  test("admin does not see Book link", async ({ page }) => {
    await clearAuth(page);
    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);
    
    await page.goto("/audit");
    
    await expect(page.getByRole("link", { name: "Book" })).not.toBeVisible();
  });

  test("unauthenticated user redirected to login", async ({ page }) => {
    await clearAuth(page);
    
    await page.goto("/booking");
    
    await expect(page).toHaveURL("/login");
  });
});

test.describe("Booking API", () => {
  test("regular user can book via API", async ({ page, request }) => {
    await clearAuth(page);
    // Set up availability as admin
    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);
    const dateStr = getTomorrowDateStr();
    await setAvailability(page, dateStr);
    await clearAuth(page);
    
    // Login as regular user
    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);
    
    const cookies = await page.context().cookies();
    const authCookie = cookies.find(c => c.name === "auth_token");
    
    if (authCookie) {
      // Use 11:45 to avoid conflicts with other tests using 10:00
      const response = await request.post(`${API_URL}/api/booking`, {
        headers: {
          Cookie: `auth_token=${authCookie.value}`,
          "Content-Type": "application/json",
        },
        data: {
          slot_start: `${dateStr}T11:45:00Z`,
          note: "API test booking",
        },
      });
      
      expect(response.status()).toBe(200);
      const data = await response.json();
      expect(data.note).toBe("API test booking");
      expect(data.status).toBe("booked");
    }
  });

  test("admin cannot book via API", async ({ page, request }) => {
    await clearAuth(page);
    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);
    const dateStr = getTomorrowDateStr();
    await setAvailability(page, dateStr);
    
    const cookies = await page.context().cookies();
    const authCookie = cookies.find(c => c.name === "auth_token");
    
    if (authCookie) {
      const response = await request.post(`${API_URL}/api/booking`, {
        headers: {
          Cookie: `auth_token=${authCookie.value}`,
          "Content-Type": "application/json",
        },
        data: {
          slot_start: `${dateStr}T10:15:00Z`,
        },
      });
      
      expect(response.status()).toBe(403);
    }
  });
});