/**
 * Site Crawler Utility
 * Crawls the site discovering links and capturing errors
 */

import { Page, BrowserContext } from '@playwright/test';

export interface CrawlError {
  url: string;
  type: 'console' | 'network' | 'broken-link' | 'page-error';
  message: string;
  details?: string;
  timestamp: Date;
}

export interface CrawlResult {
  url: string;
  status: 'success' | 'error' | 'skipped';
  title?: string;
  errors: CrawlError[];
  linksFound: string[];
  duration: number;
}

export interface CrawlReport {
  startTime: Date;
  endTime: Date;
  totalPages: number;
  totalErrors: number;
  results: CrawlResult[];
  summary: {
    consoleErrors: number;
    networkErrors: number;
    brokenLinks: number;
    pageErrors: number;
  };
}

export interface CrawlerOptions {
  maxPages?: number;
  timeout?: number;
  excludePatterns?: RegExp[];
  includeExternalLinks?: boolean;
  waitForNetworkIdle?: boolean;
  screenshotOnError?: boolean;
  screenshotDir?: string;
  verbose?: boolean;
}

const DEFAULT_OPTIONS: CrawlerOptions = {
  maxPages: 0,  // 0 = unlimited
  timeout: 30000,
  excludePatterns: [
    /\.(pdf|zip|tar|gz|exe|dmg|pkg)$/i,
    /^mailto:/i,
    /^tel:/i,
    /^javascript:/i,
    /logout/i,
    /sign-out/i,
  ],
  includeExternalLinks: false,
  waitForNetworkIdle: true,
  screenshotOnError: false,
  screenshotDir: 'test-results/crawler-screenshots',
  verbose: false,
};

export class SiteCrawler {
  private page: Page;
  private context: BrowserContext;
  private options: CrawlerOptions;
  private visited: Set<string> = new Set();
  private queue: string[] = [];
  private results: CrawlResult[] = [];
  private baseUrl: string = '';
  private baseDomain: string = '';

  constructor(page: Page, context: BrowserContext, options: Partial<CrawlerOptions> = {}) {
    this.page = page;
    this.context = context;
    this.options = { ...DEFAULT_OPTIONS, ...options };
  }

  private log(message: string, ...args: unknown[]) {
    if (this.options.verbose) {
      console.log(`[Crawler] ${message}`, ...args);
    }
  }

  private normalizeUrl(url: string): string {
    try {
      const parsed = new URL(url, this.baseUrl);
      // Remove hash and trailing slash for comparison
      parsed.hash = '';
      let normalized = parsed.href;
      if (normalized.endsWith('/') && normalized !== parsed.origin + '/') {
        normalized = normalized.slice(0, -1);
      }
      return normalized;
    } catch {
      return url;
    }
  }

  private isInternalUrl(url: string): boolean {
    try {
      const parsed = new URL(url, this.baseUrl);
      // Check if it's on the same domain or a subdomain of lvh.me
      return parsed.hostname.endsWith('lvh.me') ||
             parsed.hostname === 'localhost' ||
             parsed.hostname === '127.0.0.1';
    } catch {
      return false;
    }
  }

  private shouldCrawl(url: string): boolean {
    // Skip if already visited
    if (this.visited.has(url)) {
      return false;
    }

    // Skip if matches exclude patterns
    for (const pattern of this.options.excludePatterns || []) {
      if (pattern.test(url)) {
        this.log(`Skipping excluded URL: ${url}`);
        return false;
      }
    }

    // Skip external links unless explicitly included
    if (!this.options.includeExternalLinks && !this.isInternalUrl(url)) {
      this.log(`Skipping external URL: ${url}`);
      return false;
    }

    return true;
  }

  private async extractLinks(): Promise<string[]> {
    const links = await this.page.evaluate(() => {
      const anchors = document.querySelectorAll('a[href]');
      const hrefs: string[] = [];
      anchors.forEach(anchor => {
        const href = anchor.getAttribute('href');
        if (href) {
          hrefs.push(href);
        }
      });
      return hrefs;
    });

    // Normalize and filter links
    const normalizedLinks: string[] = [];
    for (const link of links) {
      try {
        const normalized = this.normalizeUrl(link);
        if (this.shouldCrawl(normalized)) {
          normalizedLinks.push(normalized);
        }
      } catch {
        // Invalid URL, skip
      }
    }

    return [...new Set(normalizedLinks)];
  }

  private async crawlPage(url: string): Promise<CrawlResult> {
    const startTime = Date.now();
    const errors: CrawlError[] = [];
    const linksFound: string[] = [];

    this.log(`Crawling: ${url}`);

    // Set up error listeners
    const consoleHandler = (msg: { type: () => string; text: () => string; location: () => { url: string; lineNumber: number } }) => {
      const type = msg.type();
      if (type === 'error' || type === 'warning') {
        const text = msg.text();
        // Filter out non-critical warnings
        if (text.includes('width(-1) and height(-1) of chart')) return; // Recharts initial render warning
        if (text.includes('WebSocket')) return; // WebSocket connection issues in dev
        if (text.includes('Cross-Origin-Opener-Policy')) return; // COOP header in dev environment
        if (text.includes('must use HTTPS') && text.includes('Stripe')) return; // Stripe dev mode warning
        // Show all backend errors (403, 404, 500) for debugging

        errors.push({
          url,
          type: 'console',
          message: text,
          details: `${type.toUpperCase()} at ${msg.location().url}:${msg.location().lineNumber}`,
          timestamp: new Date(),
        });
      }
    };

    const pageErrorHandler = (error: Error) => {
      errors.push({
        url,
        type: 'page-error',
        message: error.message,
        details: error.stack,
        timestamp: new Date(),
      });
    };

    const requestFailedHandler = (request: { url: () => string; failure: () => { errorText: string } | null }) => {
      const failedUrl = request.url();
      // Ignore some common non-critical failures
      if (failedUrl.includes('favicon.ico') || failedUrl.includes('hot-update')) {
        return;
      }
      // Ignore Stripe external requests (tracking/monitoring that gets cancelled)
      if (failedUrl.includes('stripe.com') || failedUrl.includes('stripe.network')) {
        return;
      }
      // Show all API failures for debugging
      errors.push({
        url,
        type: 'network',
        message: `Request failed: ${failedUrl}`,
        details: request.failure()?.errorText || 'Unknown error',
        timestamp: new Date(),
      });
    };

    const responseHandler = (response: { url: () => string; status: () => number }) => {
      const status = response.status();
      const responseUrl = response.url();
      // Track 4xx and 5xx responses (excluding some common benign ones)
      if (status >= 400 && !responseUrl.includes('favicon.ico')) {
        // Show all API errors (403, 404, 500) for debugging

        errors.push({
          url,
          type: 'network',
          message: `HTTP ${status}: ${responseUrl}`,
          details: `Response status ${status}`,
          timestamp: new Date(),
        });
      }
    };

    this.page.on('console', consoleHandler);
    this.page.on('pageerror', pageErrorHandler);
    this.page.on('requestfailed', requestFailedHandler);
    this.page.on('response', responseHandler);

    try {
      // Navigate to the page
      const response = await this.page.goto(url, {
        timeout: this.options.timeout,
        waitUntil: this.options.waitForNetworkIdle ? 'networkidle' : 'domcontentloaded',
      });

      if (!response) {
        errors.push({
          url,
          type: 'network',
          message: 'No response received',
          timestamp: new Date(),
        });
        return {
          url,
          status: 'error',
          errors,
          linksFound,
          duration: Date.now() - startTime,
        };
      }

      const status = response.status();
      if (status >= 400) {
        errors.push({
          url,
          type: 'broken-link',
          message: `HTTP ${status}`,
          timestamp: new Date(),
        });
      }

      // Wait a bit for React to render and any async operations
      await this.page.waitForTimeout(500);

      // Get page title
      const title = await this.page.title();

      // Extract links
      const links = await this.extractLinks();
      linksFound.push(...links);

      // Add new links to queue
      for (const link of links) {
        if (!this.visited.has(link) && !this.queue.includes(link)) {
          this.queue.push(link);
        }
      }

      // Screenshot on error if enabled
      if (errors.length > 0 && this.options.screenshotOnError) {
        const filename = url.replace(/[^a-zA-Z0-9]/g, '_').substring(0, 100);
        await this.page.screenshot({
          path: `${this.options.screenshotDir}/${filename}.png`,
          fullPage: true,
        });
      }

      return {
        url,
        status: errors.length > 0 ? 'error' : 'success',
        title,
        errors,
        linksFound,
        duration: Date.now() - startTime,
      };
    } catch (error) {
      errors.push({
        url,
        type: 'page-error',
        message: error instanceof Error ? error.message : String(error),
        timestamp: new Date(),
      });

      return {
        url,
        status: 'error',
        errors,
        linksFound,
        duration: Date.now() - startTime,
      };
    } finally {
      // Remove listeners
      this.page.off('console', consoleHandler);
      this.page.off('pageerror', pageErrorHandler);
      this.page.off('requestfailed', requestFailedHandler);
      this.page.off('response', responseHandler);
    }
  }

  async crawl(startUrl: string): Promise<CrawlReport> {
    const startTime = new Date();
    this.baseUrl = startUrl;
    this.baseDomain = new URL(startUrl).hostname;
    this.queue = [this.normalizeUrl(startUrl)];
    this.visited.clear();
    this.results = [];

    console.log(`\n🕷️  Starting crawl from: ${startUrl}`);
    console.log(`   Max pages: ${this.options.maxPages || 'unlimited'}`);
    console.log('');

    const maxPages = this.options.maxPages || 0;  // 0 = unlimited
    while (this.queue.length > 0 && (maxPages === 0 || this.results.length < maxPages)) {
      const url = this.queue.shift()!;

      if (this.visited.has(url)) {
        continue;
      }

      this.visited.add(url);
      const result = await this.crawlPage(url);
      this.results.push(result);

      // Progress indicator
      const errorCount = result.errors.length;
      const statusIcon = result.status === 'success' ? '✓' : '✗';
      const errorInfo = errorCount > 0 ? ` (${errorCount} error${errorCount > 1 ? 's' : ''})` : '';
      const maxDisplay = maxPages === 0 ? '∞' : maxPages;
      console.log(`  ${statusIcon} [${this.results.length}/${maxDisplay}] ${url}${errorInfo}`);
    }

    const endTime = new Date();

    // Calculate summary
    const summary = {
      consoleErrors: 0,
      networkErrors: 0,
      brokenLinks: 0,
      pageErrors: 0,
    };

    for (const result of this.results) {
      for (const error of result.errors) {
        switch (error.type) {
          case 'console':
            summary.consoleErrors++;
            break;
          case 'network':
            summary.networkErrors++;
            break;
          case 'broken-link':
            summary.brokenLinks++;
            break;
          case 'page-error':
            summary.pageErrors++;
            break;
        }
      }
    }

    return {
      startTime,
      endTime,
      totalPages: this.results.length,
      totalErrors: summary.consoleErrors + summary.networkErrors + summary.brokenLinks + summary.pageErrors,
      results: this.results,
      summary,
    };
  }
}

export function formatReport(report: CrawlReport): string {
  const duration = (report.endTime.getTime() - report.startTime.getTime()) / 1000;

  let output = '\n';
  output += '═'.repeat(60) + '\n';
  output += '                    CRAWL REPORT\n';
  output += '═'.repeat(60) + '\n\n';

  output += `📊 Summary\n`;
  output += `   Pages crawled: ${report.totalPages}\n`;
  output += `   Total errors:  ${report.totalErrors}\n`;
  output += `   Duration:      ${duration.toFixed(1)}s\n\n`;

  output += `📋 Error Breakdown\n`;
  output += `   Console errors:  ${report.summary.consoleErrors}\n`;
  output += `   Network errors:  ${report.summary.networkErrors}\n`;
  output += `   Broken links:    ${report.summary.brokenLinks}\n`;
  output += `   Page errors:     ${report.summary.pageErrors}\n\n`;

  // List pages with errors
  const pagesWithErrors = report.results.filter(r => r.errors.length > 0);
  if (pagesWithErrors.length > 0) {
    output += '─'.repeat(60) + '\n';
    output += '                    ERROR DETAILS\n';
    output += '─'.repeat(60) + '\n\n';

    for (const result of pagesWithErrors) {
      output += `🔗 ${result.url}\n`;
      output += `   Title: ${result.title || 'N/A'}\n`;

      for (const error of result.errors) {
        const icon = error.type === 'console' ? '⚠️' :
                     error.type === 'network' ? '🌐' :
                     error.type === 'broken-link' ? '🔴' : '💥';
        output += `   ${icon} [${error.type.toUpperCase()}] ${error.message}\n`;
        if (error.details) {
          output += `      Details: ${error.details.substring(0, 200)}\n`;
        }
      }
      output += '\n';
    }
  } else {
    output += '✅ No errors found!\n\n';
  }

  output += '═'.repeat(60) + '\n';

  return output;
}

// Authentication helpers for different user types
export interface UserCredentials {
  username: string;
  password: string;
  loginUrl: string;
  description: string;
}

export const TEST_USERS: Record<string, UserCredentials> = {
  platformSuperuser: {
    username: 'poduck@gmail.com',
    password: 'starry12',
    loginUrl: 'http://platform.lvh.me:5173/platform/login',
    description: 'Platform Superuser',
  },
  businessOwner: {
    username: 'owner@demo.com',
    password: 'password123',
    loginUrl: 'http://demo.lvh.me:5173/login',
    description: 'Business Owner',
  },
  businessManager: {
    username: 'manager@demo.com',
    password: 'password123',
    loginUrl: 'http://demo.lvh.me:5173/login',
    description: 'Business Manager',
  },
  businessStaff: {
    username: 'staff@demo.com',
    password: 'password123',
    loginUrl: 'http://demo.lvh.me:5173/login',
    description: 'Staff Member',
  },
  customer: {
    username: 'customer@demo.com',
    password: 'password123',
    loginUrl: 'http://demo.lvh.me:5173/login',
    description: 'Customer',
  },
};

export async function loginAsUser(page: Page, user: UserCredentials): Promise<boolean> {
  console.log(`\n🔐 Logging in as ${user.description}...`);
  console.log(`   Login URL: ${user.loginUrl}`);

  try {
    await page.goto(user.loginUrl);
    await page.waitForLoadState('networkidle');
    await page.waitForTimeout(1000);

    // Check if already logged in (dashboard visible)
    const isDashboard = page.url().includes('/dashboard') ||
      await page.getByRole('heading', { name: /dashboard/i }).isVisible().catch(() => false);

    if (isDashboard) {
      console.log(`   ✓ Already logged in. Current URL: ${page.url()}`);
      return true;
    }

    // Try quick login buttons first (dev mode)
    const quickLoginButton = page.getByRole('button', { name: new RegExp(user.description, 'i') });
    const hasQuickLogin = await quickLoginButton.isVisible().catch(() => false);

    if (hasQuickLogin) {
      console.log(`   Using quick login button for ${user.description}...`);
      await quickLoginButton.click();
    } else {
      // Fall back to form login
      let emailInput = page.locator('#email');
      let passwordInput = page.locator('#password');

      const formFound = await emailInput.waitFor({ timeout: 10000 }).then(() => true).catch(() => false);

      if (!formFound) {
        emailInput = page.getByPlaceholder(/enter your email/i);
        passwordInput = page.getByPlaceholder(/password/i);
        await emailInput.waitFor({ timeout: 5000 });
      }

      await emailInput.fill(user.username);
      await passwordInput.fill(user.password);
      await page.getByRole('button', { name: /^sign in$/i }).click();
    }

    // Wait for navigation after login
    await page.waitForLoadState('networkidle');
    await page.waitForTimeout(2000);

    // Verify we're logged in (not on login page anymore)
    const currentUrl = page.url();
    const isLoggedIn = !currentUrl.includes('/login') &&
                       !currentUrl.endsWith(':5173/') &&
                       !currentUrl.endsWith(':5173');

    if (isLoggedIn) {
      console.log(`   ✓ Logged in successfully. Current URL: ${currentUrl}`);
    } else {
      console.log(`   ✗ Login may have failed. Current URL: ${currentUrl}`);
    }

    return isLoggedIn;
  } catch (error) {
    console.error(`   ✗ Login failed:`, error);
    return false;
  }
}