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

import {
  IBLEManager,
  WPDevice,
  WiFiNetwork,
  WiFiStatus,
  BLEConnectionState,
  BLEDeviceConnection,
  BLEEventListener,
  BLEConnectionEvent,
} 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
  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);
  }

  /**
   * 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();
    this.eventListeners = [];
  }
}