/**
 * WebSocket client for real-time domain updates
 */

class PeerDirectoryWebSocket {
  constructor() {
    this.ws = null;
    this.reconnectAttempts = 0;
    this.maxReconnectAttempts = 10;
    this.reconnectDelay = 1000;
    this.listeners = new Map();
    this.isConnected = false;
    this.reconnectTimeout = null;
  }

  /**
   * Connect to WebSocket server
   */
  connect() {
    const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
    const wsUrl = `${protocol}//${window.location.host}/ws`;

    try {
      this.ws = new WebSocket(wsUrl);

      this.ws.onopen = () => {
        this.isConnected = true;
        this.reconnectAttempts = 0;
        this.emit('connected');
        this.updateStatus(true);
      };

      this.ws.onmessage = (event) => {
        try {
          const message = JSON.parse(event.data);
          this.handleMessage(message);
        } catch (err) {
          console.error('Error parsing WebSocket message:', err);
        }
      };

      this.ws.onerror = (error) => {
        console.error('WebSocket error:', error);
        this.emit('error', error);
      };

      this.ws.onclose = () => {
        this.isConnected = false;
        this.updateStatus(false);
        this.emit('disconnected');
        this.attemptReconnect();
      };
    } catch (err) {
      console.error('Error connecting to WebSocket:', err);
      this.attemptReconnect();
    }
  }

  /**
   * Handle incoming messages
   */
  handleMessage(message) {
    const { type, data } = message;

    switch (type) {
      case 'init':
        this.emit('init', data);
        break;
      case 'update':
        this.emit('update', data);
        break;
      case 'domain-added':
        this.emit('domain-added', data);
        break;
      case 'domain-removed':
        this.emit('domain-removed', data);
        break;
      default:
        // Silently ignore unknown message types from other plugins
        // This is normal - the WebSocket server broadcasts to all clients
    }
  }

  /**
   * Send message to server
   */
  send(type, data = {}) {
    if (this.ws && this.ws.readyState === WebSocket.OPEN) {
      this.ws.send(JSON.stringify({ type, ...data }));
    }
  }

  /**
   * Request initial domain data from server
   */
  requestDomains() {
    this.send('request-domains');
  }

  /**
   * Attempt to reconnect
   */
  attemptReconnect() {
    if (this.reconnectAttempts >= this.maxReconnectAttempts) {
      console.error('Max reconnection attempts reached');
      this.emit('reconnect-failed');
      return;
    }

    if (this.reconnectTimeout) {
      clearTimeout(this.reconnectTimeout);
    }

    this.reconnectAttempts++;
    const delay = Math.min(this.reconnectDelay * Math.pow(2, this.reconnectAttempts - 1), 30000);

    this.reconnectTimeout = setTimeout(() => {
      console.log(`Attempting to reconnect (${this.reconnectAttempts}/${this.maxReconnectAttempts})...`);
      this.emit('reconnecting');
      this.connect();
    }, delay);
  }

  /**
   * Update connection status indicator
   */
  updateStatus(connected) {
    const indicator = document.getElementById('statusIndicator');
    const statusText = document.getElementById('statusText');

    if (indicator && statusText) {
      if (connected) {
        indicator.classList.remove('disconnected');
        statusText.textContent = 'Connected';
      } else {
        indicator.classList.add('disconnected');
        statusText.textContent = 'Disconnected - Reconnecting...';
      }
    }
  }

  /**
   * Add event listener
   */
  on(event, callback) {
    if (!this.listeners.has(event)) {
      this.listeners.set(event, []);
    }
    this.listeners.get(event).push(callback);
  }

  /**
   * Remove event listener
   */
  off(event, callback) {
    if (this.listeners.has(event)) {
      const callbacks = this.listeners.get(event);
      const index = callbacks.indexOf(callback);
      if (index > -1) {
        callbacks.splice(index, 1);
      }
    }
  }

  /**
   * Emit event to listeners
   */
  emit(event, data) {
    if (this.listeners.has(event)) {
      this.listeners.get(event).forEach(callback => {
        try {
          callback(data);
        } catch (err) {
          console.error(`Error in WebSocket event listener for ${event}:`, err);
        }
      });
    }
  }

  /**
   * Disconnect
   */
  disconnect() {
    if (this.reconnectTimeout) {
      clearTimeout(this.reconnectTimeout);
      this.reconnectTimeout = null;
    }

    if (this.ws) {
      this.ws.close();
      this.ws = null;
    }

    this.isConnected = false;
    this.listeners.clear();
  }
}

// Create singleton instance
window.wsClient = new PeerDirectoryWebSocket();