/**
 * WebView Utilities
 * Handles WebView management, navigation, and message handling
 */

import { WebViewNavigation } from 'react-native-webview';
import { Linking, Platform } from 'react-native';
import { ALLOWED_DOMAIN } from './constants';

/**
 * Interface for WebView message data
 */
export interface WebViewMessageData {
  type?: string;
  cookies?: string;
  [key: string]: any;
}

/**
 * Interface for WebView navigation state
 */
export interface WebViewNavigationState {
  currentChannel: string | null;
  isNavigating: boolean;
}

/**
 * WebView Handler Class
 */
export class WebViewHandler {
  private webViewRef: React.RefObject<any>;
  private updateWebViewUrl: (url: string) => void;
  private navigationState: WebViewNavigationState;

  constructor(
    webViewRef: React.RefObject<any>,
    updateWebViewUrl: (url: string) => void,
    navigationState: WebViewNavigationState
  ) {
    this.webViewRef = webViewRef;
    this.updateWebViewUrl = updateWebViewUrl;
    this.navigationState = navigationState;
  }

  /**
   * Handle WebView navigation requests
   * @param request - Navigation request from WebView
   * @returns boolean indicating whether to allow navigation
   */
  handleNavigation(request: WebViewNavigation): boolean {
    const { url } = request;
    
    console.log('🧭 Navigation to:', url);
    
    // Validate URL before processing
    try {
      new URL(url);
    } catch (error) {
      console.error("❌ Invalid URL detected:", url, error);
      return false; // Block invalid URLs
    }
    
    // 🧪 Test notification when navigating to specific URL (temporary for testing)
    if (url.includes('test-notification')) {
      console.log('🧪 Test notification triggered via URL');
      // You can trigger test notification here if needed
      return false;
    }

    // ✅ Stay inside Odoo instance
    if (
      url.startsWith(`${ALLOWED_DOMAIN}`) ||
      url.startsWith(`${ALLOWED_DOMAIN}`)
    ) {
      return true;
    }

    // 🌍 Open external links in default browser
    Linking.openURL(url).catch((err) =>
      console.error("Couldn't open external link", err)
    );

    return false; // block WebView from handling it
  }

  /**
   * Handle messages from WebView
   * @param event - Message event from WebView
   * @param setWebViewCookies - Function to set cookies
   */
  handleWebViewMessage(
    event: any,
    setWebViewCookies: (cookies: string | null) => void
  ): void {
    try {
      const messageData = event.nativeEvent.data;
      
      // Try to parse as JSON first
      try {
        const data: WebViewMessageData = JSON.parse(messageData);
        console.log('📨 WebView JSON message received:', data);
        
        // Handle cookie extraction (if needed)
        if (data.type === 'cookies') {
          console.log('🍪 Cookies from WebView:', data.cookies);
          setWebViewCookies(data.cookies || null);
        }
      } catch (jsonError) {
        // If JSON parsing fails, treat as plain text message
        console.log('📨 WebView text message received:', messageData);
        
        // Handle navigation feedback messages
        if (messageData.startsWith('NAVIGATION_RESULT:')) {
          const result = messageData.replace('NAVIGATION_RESULT:', '');
          console.log('🔗 Navigation Result:', result);
        }
        // Handle other plain text messages here if needed
      }
    } catch (error) {
      console.error('❌ Error handling WebView message:', error);
    }
  }

  /**
   * Handle WebView load completion
   * @param currentChannel - Current channel being navigated to
   * @param isNavigating - Whether navigation is in progress
   */
  handleWebViewLoadEnd(currentChannel: string | null, isNavigating: boolean): void {
    console.log('🔗 WebView loaded, current channel:', currentChannel, 'isNavigating:', isNavigating);
    
    // Check if we successfully navigated to the target channel
    if (currentChannel && this.webViewRef.current) {
      console.log('🔗 WebView loaded - checking if navigation was successful');
      
      // Add a simple debug script to check current URL
      const checkScript = `
        (function() {
          try {
            console.log('🔗 WebView loaded - Current URL:', window.location.href);
            console.log('🔗 WebView loaded - Current hash:', window.location.hash);
            
            // Check if we're on the target channel page
            if (window.location.hash.includes('mail.channel_${currentChannel}')) {
              console.log('✅ Successfully navigated to channel ${currentChannel}');
              if (window.ReactNativeWebView) {
                window.ReactNativeWebView.postMessage('NAVIGATION_RESULT:Successfully navigated to channel ${currentChannel}');
              }
            } else {
              console.log('⚠️ Not on target channel page yet');
              console.log('🔗 Expected: mail.channel_${currentChannel}');
              console.log('🔗 Actual hash:', window.location.hash);
            }
            
          } catch (error) {
            console.error('❌ Error in check script:', error);
          }
        })();
        true;
      `;
      
      this.webViewRef.current.injectJavaScript(checkScript);
    }
    
    // If we're navigating and have a current channel, we might need to retry
    if (currentChannel && isNavigating) {
      console.log('🔗 Navigation in progress - checking if retry needed');
      // Don't retry immediately, let the two-step navigation complete
    } else if (currentChannel && !isNavigating) {
      console.log('🔗 Navigation complete - no retry needed');
    } else {
      console.log('🔗 No active navigation');
    }
  }

  /**
   * Inject debug script into WebView
   */
  injectDebugScript(): void {
    if (this.webViewRef.current) {
      const debugScript = `
        (function() {
          console.log('🔍 WebView Debug Info:');
          console.log('  - Current URL:', window.location.href);
          console.log('  - Current hash:', window.location.hash);
          console.log('  - Document ready state:', document.readyState);
          console.log('  - Available chat elements:', document.querySelectorAll('[class*="mail"], [class*="chat"], [data-model*="mail"]').length);
          console.log('  - Available channel elements:', document.querySelectorAll('[data-channel-id], [data-id*="mail.channel"], [data-oe-id*="mail.channel"]').length);
          
          // List all elements with channel-related attributes
          const channelElements = document.querySelectorAll('[data-channel-id], [data-id*="mail.channel"], [data-oe-id*="mail.channel"], a[href*="mail.channel"]');
          console.log('🔍 Channel elements found:', channelElements.length);
          channelElements.forEach((el, index) => {
            console.log(\`  \${index + 1}. \${el.tagName} - \${el.className} - \${el.getAttribute('data-channel-id') || el.getAttribute('data-id') || el.getAttribute('href')}\`);
          });
          
          // Check Odoo availability
          console.log('🔍 Odoo Debug:');
          console.log('  - window.odoo exists:', !!window.odoo);
          console.log('  - odoo.loader exists:', !!(window.odoo && window.odoo.loader));
          console.log('  - odoo.services exists:', !!(window.odoo && window.odoo.services));
          console.log('  - odoo.__DEBUG__ exists:', !!(window.odoo && window.odoo.__DEBUG__));
          
          if (window.odoo && window.odoo.__DEBUG__) {
            const services = Object.keys(window.odoo.__DEBUG__.services || {});
            console.log('  - Available services:', services);
          }
        })();
        true;
      `;
      this.webViewRef.current.injectJavaScript(debugScript);
    }
  }

  /**
   * Get WebView console messages
   * @param event - Console message event
   */
  handleConsoleMessage(event: any): void {
    console.log('🌐 WebView Console:', event.nativeEvent.message);
  }
}

/**
 * Create WebView handler instance
 */
export function createWebViewHandler(
  webViewRef: React.RefObject<any>,
  updateWebViewUrl: (url: string) => void,
  navigationState: WebViewNavigationState
): WebViewHandler {
  return new WebViewHandler(webViewRef, updateWebViewUrl, navigationState);
}