// Mock BLE Manager для iOS Simulator (Bluetooth недоступен)

import {
  IBLEManager,
  WPDevice,
  WiFiNetwork,
  WiFiStatus,
  BLEConnectionState,
  BLEDeviceConnection,
  BLEEventListener,
  BLEConnectionEvent,
  SensorHealthMetrics,
  SensorHealthStatus,
  WiFiSignalQuality,
  CommunicationHealth,
  BulkOperationResult,
  BulkWiFiResult,
} from './types';

const delay = (ms: number) => new Promise(resolve => setTimeout(resolve, ms));

export class MockBLEManager implements IBLEManager {
  private connectedDevices = new Set<string>();
  private connectionStates = new Map<string, BLEDeviceConnection>();
  private eventListeners: BLEEventListener[] = [];
  private connectingDevices = new Set<string>(); // Track devices currently being connected

  // Health monitoring state (mock)
  private sensorHealthMetrics = new Map<string, SensorHealthMetrics>();
  private communicationStats = new Map<string, CommunicationHealth>();
  private mockDevices: WPDevice[] = [
    {
      id: 'mock-743',
      name: 'WP_497_81a14c',
      mac: '142B2F81A14C',
      rssi: -55,
      wellId: 497,
    },
    {
      id: 'mock-769',
      name: 'WP_523_81aad4',
      mac: '142B2F81AAD4',
      rssi: -67,
      wellId: 523,
    },
  ];

  /**
   * Update connection state and notify listeners
   */
  private updateConnectionState(
    deviceId: string,
    state: BLEConnectionState,
    deviceName?: string,
    error?: string
  ): void {
    const existing = this.connectionStates.get(deviceId);
    const now = Date.now();

    const connection: BLEDeviceConnection = {
      deviceId,
      deviceName: deviceName || existing?.deviceName || deviceId,
      state,
      error,
      connectedAt: state === BLEConnectionState.CONNECTED ? now : existing?.connectedAt,
      lastActivity: now,
    };

    this.connectionStates.set(deviceId, connection);
    this.emitEvent(deviceId, 'state_changed', { state, error });
  }

  /**
   * Emit event to all registered listeners
   */
  private emitEvent(deviceId: string, event: BLEConnectionEvent, data?: any): void {
    this.eventListeners.forEach((listener) => {
      try {
        listener(deviceId, event, data);
      } catch {
        // Listener error should not crash the app
      }
    });
  }

  /**
   * Get current connection state for a device
   */
  getConnectionState(deviceId: string): BLEConnectionState {
    const connection = this.connectionStates.get(deviceId);
    return connection?.state || BLEConnectionState.DISCONNECTED;
  }

  /**
   * Get all active connections
   */
  getAllConnections(): Map<string, BLEDeviceConnection> {
    return new Map(this.connectionStates);
  }

  /**
   * Add event listener
   */
  addEventListener(listener: BLEEventListener): void {
    if (!this.eventListeners.includes(listener)) {
      this.eventListeners.push(listener);
    }
  }

  /**
   * Remove event listener
   */
  removeEventListener(listener: BLEEventListener): void {
    const index = this.eventListeners.indexOf(listener);
    if (index > -1) {
      this.eventListeners.splice(index, 1);
    }
  }

  async scanDevices(): Promise<WPDevice[]> {
    await delay(2000); // Simulate scan delay
    return this.mockDevices;
  }

  stopScan(): void {
  }

  async connectDevice(deviceId: string): Promise<boolean> {
    try {
      // Check if connection is already in progress
      if (this.connectingDevices.has(deviceId)) {
        throw new Error('Connection already in progress for this device');
      }

      // Check if already connected
      if (this.connectedDevices.has(deviceId)) {
        this.updateConnectionState(deviceId, BLEConnectionState.READY);
        this.emitEvent(deviceId, 'ready');
        return true;
      }

      // Mark device as connecting
      this.connectingDevices.add(deviceId);

      this.updateConnectionState(deviceId, BLEConnectionState.CONNECTING);
      await delay(500);

      this.updateConnectionState(deviceId, BLEConnectionState.CONNECTED);
      await delay(300);

      this.updateConnectionState(deviceId, BLEConnectionState.DISCOVERING);
      await delay(200);

      this.connectedDevices.add(deviceId);
      this.updateConnectionState(deviceId, BLEConnectionState.READY);
      this.emitEvent(deviceId, 'ready');

      return true;
    } catch (error: any) {
      const errorMessage = error?.message || 'Connection failed';
      this.updateConnectionState(deviceId, BLEConnectionState.ERROR, undefined, errorMessage);
      this.emitEvent(deviceId, 'connection_failed', { error: errorMessage });
      return false;
    } finally {
      // Always remove from connecting set when done (success or failure)
      this.connectingDevices.delete(deviceId);
    }
  }

  async disconnectDevice(deviceId: string): Promise<void> {
    this.updateConnectionState(deviceId, BLEConnectionState.DISCONNECTING);
    await delay(500);
    this.connectedDevices.delete(deviceId);
    this.updateConnectionState(deviceId, BLEConnectionState.DISCONNECTED);
    this.emitEvent(deviceId, 'disconnected');
  }

  isDeviceConnected(deviceId: string): boolean {
    return this.connectedDevices.has(deviceId);
  }

  async sendCommand(deviceId: string, command: string): Promise<string> {
    await delay(500);

    // Simulate responses
    if (command === 'pin|7856') {
      return 'pin|ok';
    }
    if (command === 'w') {
      return 'mac,142b2f81a14c|w|3|FrontierTower,-55|HomeNetwork,-67|TP-Link_5G,-75';
    }
    if (command === 'a') {
      return 'mac,142b2f81a14c|a|FrontierTower,-67';
    }
    if (command.startsWith('W|')) {
      return 'mac,142b2f81a14c|W|ok';
    }

    return 'ok';
  }

  async getWiFiList(deviceId: string): Promise<WiFiNetwork[]> {
    await delay(1500);

    return [
      { ssid: 'FrontierTower', rssi: -55 },
      { ssid: 'HomeNetwork', rssi: -67 },
      { ssid: 'TP-Link_5G', rssi: -75 },
      { ssid: 'Office-WiFi', rssi: -80 },
    ];
  }

  async setWiFi(
    deviceId: string,
    ssid: string,
    password: string
  ): Promise<boolean> {
    await delay(2000);
    return true;
  }

  async getCurrentWiFi(deviceId: string): Promise<WiFiStatus | null> {
    await delay(1000);

    return {
      ssid: 'FrontierTower',
      rssi: -67,
      connected: true,
    };
  }

  async rebootDevice(deviceId: string): Promise<void> {
    await delay(500);
    this.connectedDevices.delete(deviceId);
  }

  /**
   * Get sensor health metrics (mock implementation)
   */
  async getSensorHealth(wellId: number, mac: string): Promise<SensorHealthMetrics | null> {
    await delay(1000);

    const deviceKey = `WP_${wellId}_${mac.slice(-6).toLowerCase()}`;

    // Generate mock health metrics
    const now = Date.now();
    const mockMetrics: SensorHealthMetrics = {
      deviceId: `mock-${wellId}`,
      deviceName: deviceKey,
      overallHealth: SensorHealthStatus.GOOD,
      connectionStatus: 'online',
      lastSeen: new Date(),
      lastSeenMinutesAgo: 2,
      wifiSignalQuality: WiFiSignalQuality.GOOD,
      wifiRssi: -60,
      wifiSsid: 'FrontierTower',
      wifiConnected: true,
      communication: {
        successfulCommands: 45,
        failedCommands: 2,
        averageResponseTime: 350,
        lastSuccessfulCommand: now - 120000, // 2 minutes ago
        lastFailedCommand: now - 3600000, // 1 hour ago
      },
      bleRssi: -55,
      bleConnectionAttempts: 10,
      bleConnectionFailures: 1,
      lastHealthCheck: now,
      lastBleConnection: now - 120000,
    };

    this.sensorHealthMetrics.set(deviceKey, mockMetrics);
    return mockMetrics;
  }

  /**
   * Get all cached sensor health metrics (mock)
   */
  getAllSensorHealth(): Map<string, SensorHealthMetrics> {
    return new Map(this.sensorHealthMetrics);
  }

  /**
   * Cleanup all BLE connections and state
   * Should be called on app logout to properly release resources
   */
  async cleanup(): Promise<void> {

    // Disconnect all connected devices
    const deviceIds = Array.from(this.connectedDevices);
    for (const deviceId of deviceIds) {
      await this.disconnectDevice(deviceId);
    }

    this.connectedDevices.clear();
    this.connectionStates.clear();
    this.connectingDevices.clear();

    // Clear health monitoring data
    this.sensorHealthMetrics.clear();
    this.communicationStats.clear();

    this.eventListeners = [];
  }

  /**
   * Bulk disconnect multiple devices (mock)
   */
  async bulkDisconnect(deviceIds: string[]): Promise<BulkOperationResult[]> {
    const results: BulkOperationResult[] = [];

    for (const deviceId of deviceIds) {
      await delay(100); // Simulate disconnect time

      const mockDevice = this.mockDevices.find(d => d.id === deviceId);
      const deviceName = mockDevice?.name || deviceId;

      try {
        await this.disconnectDevice(deviceId);
        results.push({
          deviceId,
          deviceName,
          success: true,
        });
      } catch (error: any) {
        results.push({
          deviceId,
          deviceName,
          success: false,
          error: error?.message || 'Disconnect failed',
        });
      }
    }

    return results;
  }

  /**
   * Bulk reboot multiple devices (mock)
   */
  async bulkReboot(deviceIds: string[]): Promise<BulkOperationResult[]> {
    const results: BulkOperationResult[] = [];

    for (const deviceId of deviceIds) {
      await delay(500); // Simulate reboot time

      const mockDevice = this.mockDevices.find(d => d.id === deviceId);
      const deviceName = mockDevice?.name || deviceId;

      try {
        // Mock reboot success
        await this.rebootDevice(deviceId);
        results.push({
          deviceId,
          deviceName,
          success: true,
        });
      } catch (error: any) {
        results.push({
          deviceId,
          deviceName,
          success: false,
          error: error?.message || 'Reboot failed',
        });
      }
    }

    return results;
  }

  /**
   * Bulk WiFi configuration for multiple devices (mock)
   */
  async bulkSetWiFi(
    devices: Array<{ id: string; name: string }>,
    ssid: string,
    password: string,
    onProgress?: (deviceId: string, status: 'connecting' | 'configuring' | 'rebooting' | 'success' | 'error', error?: string) => void
  ): Promise<BulkWiFiResult[]> {
    const results: BulkWiFiResult[] = [];

    for (const device of devices) {
      const { id: deviceId, name: deviceName } = device;

      try {
        // Step 1: Connect (mock)
        onProgress?.(deviceId, 'connecting');
        await delay(800);
        await this.connectDevice(deviceId);

        // Step 2: Set WiFi (mock)
        onProgress?.(deviceId, 'configuring');
        await delay(1200);
        await this.setWiFi(deviceId, ssid, password);

        // Step 3: Reboot (mock)
        onProgress?.(deviceId, 'rebooting');
        await delay(600);
        await this.rebootDevice(deviceId);

        // Success
        onProgress?.(deviceId, 'success');
        results.push({
          deviceId,
          deviceName,
          success: true,
        });
      } catch (error: any) {
        const errorMessage = error?.message || 'WiFi configuration failed';
        onProgress?.(deviceId, 'error', errorMessage);
        results.push({
          deviceId,
          deviceName,
          success: false,
          error: errorMessage,
        });
      }
    }

    return results;
  }
}