// 设备管理相关：扫描、连接、断开、重连
import { BleDevice, BLE_CONNECTION_STATE } from '../interface.uts';
import type { BleConnectOptionsExt } from '../interface.uts';

export class DeviceManager {
  private devices = {};
  private servers = {};
  private connectionStates = {};
  private allowedServices = {};
  private reconnectAttempts: number = 0;
  private maxReconnectAttempts: number = 5;
  private reconnectDelay: number = 2000;
  private reconnectTimeoutId: number = 0;
  private autoReconnect: boolean = false;
  private connectionStateChangeListeners: Function[] = [];

  private deviceFoundListeners: ((device: BleDevice) => void)[] = [];
  private scanFinishedListeners: (() => void)[] = [];

  onDeviceFound(listener: (device: BleDevice) => void) {
    this.deviceFoundListeners.push(listener);
  }
  onScanFinished(listener: () => void) {
    this.scanFinishedListeners.push(listener);
  }
  private emitDeviceFound(device: BleDevice) {
    for (const listener of this.deviceFoundListeners) {
      try { listener(device); } catch (e) {}
    }
  }
  private emitScanFinished() {
    for (const listener of this.scanFinishedListeners) {
      try { listener(); } catch (e) {}
    }
  }

  async startScan(options?: { optionalServices?: string[] } ): Promise<void> {
    if (!navigator.bluetooth) throw new Error('Web Bluetooth API not supported');
    try {
      const scanOptions: any = { acceptAllDevices: true };
      // allow callers to request optionalServices (required by Web Bluetooth to access custom services)
      if (options && Array.isArray(options.optionalServices) && options.optionalServices.length > 0) {
        scanOptions.optionalServices = options.optionalServices;
      }
      // Log the exact options passed to requestDevice for debugging optionalServices propagation
      try {
        console.log('[DeviceManager] requestDevice options:', JSON.stringify(scanOptions));
      } catch (e) {
        console.log('[DeviceManager] requestDevice options (raw):', scanOptions);
      }
      const device = await navigator.bluetooth.requestDevice(scanOptions);
      try {
        console.log('[DeviceManager] requestDevice result:', device);
      } catch (e) {
        console.log('[DeviceManager] requestDevice result (raw):', device);
      }
      if (device) {
        console.log(device)
        // 格式化 deviceId 为 MAC 地址格式
        const formatDeviceId = (id: string): string => {
          // 如果是12位16进制字符串（如 'AABBCCDDEEFF'），转为 'AA:BB:CC:DD:EE:FF'
          if (/^[0-9A-Fa-f]{12}$/.test(id)) {
            return id.match(/.{1,2}/g)!.join(":").toUpperCase();
          }
          // 如果是base64，无法直接转MAC，保留原样
          // 你可以根据实际情况扩展此处
          return id;
        };
        const isConnected = !!this.servers[device.id];
        const formattedId = formatDeviceId(device.id);
        const bleDevice = { deviceId: formattedId, name: device.name, connected: isConnected };
        this.devices[formattedId] = device;
        this.emitDeviceFound(bleDevice);
      }
      this.emitScanFinished();
    } catch (e) {
      this.emitScanFinished();
      throw e;
    }
  }

  onConnectionStateChange(listener: (deviceId: string, state: string) => void) {
    this.connectionStateChangeListeners.push(listener);
  }
  private emitConnectionStateChange(deviceId: string, state: string) {
    for (const listener of this.connectionStateChangeListeners) {
      try {
        listener(deviceId, state);
      } catch (e) {
        // 忽略单个回调异常
      }
    }
  }

  async connectDevice(deviceId: string, options?: BleConnectOptionsExt): Promise<boolean> {
    this.autoReconnect = options?.autoReconnect ?? false;
    try {
      const device = this.devices[deviceId];
      if (!device) throw new Error('设备未找到');
      const server = await device.gatt.connect();
      this.servers[deviceId] = server;
      this.connectionStates[deviceId] = BLE_CONNECTION_STATE.CONNECTED;
      this.reconnectAttempts = 0;
      this.emitConnectionStateChange(deviceId, 'connected');
      // 监听物理断开
      if (device.gatt) {
        device.gatt.onconnectionstatechanged = null;
        device.gatt.onconnectionstatechanged = () => {
          if (!device.gatt.connected) {
            this.emitConnectionStateChange(deviceId, 'disconnected');
          }
        };
      }
      return true;
    } catch (error) {
      if (this.autoReconnect && this.reconnectAttempts < this.maxReconnectAttempts) {
        return this.scheduleReconnect(deviceId);
      }
      throw error;
    }
  }

  async disconnectDevice(deviceId: string): Promise<void> {
    const device = this.devices[deviceId];
    if (!device) throw new Error('设备未找到');
    try {
      if (device.gatt && device.gatt.connected) {
        device.gatt.disconnect();
      }
      delete this.servers[deviceId];
      this.connectionStates[deviceId] = BLE_CONNECTION_STATE.DISCONNECTED;
      this.emitConnectionStateChange(deviceId, 'disconnected');
    } catch (e) {
      throw e;
    }
  }

  getConnectedDevices(): BleDevice[] {
    const connectedDevices: BleDevice[] = [];
    for (const deviceId in this.servers) {
      const device = this.devices[deviceId];
      if (device) {
        connectedDevices.push({ deviceId: device.id, name: device.name || '未知设备', connected: true });
      }
    }
    return connectedDevices;
  }

  handleDisconnect(deviceId: string) {
    this.connectionStates[deviceId] = BLE_CONNECTION_STATE.DISCONNECTED;
    this.emitConnectionStateChange(deviceId, 'disconnected');
    if (this.autoReconnect && this.reconnectAttempts < this.maxReconnectAttempts) {
      this.scheduleReconnect(deviceId);
    }
  }

  private scheduleReconnect(deviceId: string): Promise<boolean> {
    this.reconnectAttempts++;
    return new Promise((resolve, reject) => {
      this.reconnectTimeoutId = setTimeout(() => {
        this.connectDevice(deviceId, { autoReconnect: true })
          .then(resolve)
          .catch(reject);
      }, this.reconnectDelay);
    });
  }

  cancelReconnect() {
    if (this.reconnectTimeoutId) {
      clearTimeout(this.reconnectTimeoutId);
      this.reconnectTimeoutId = 0;
    }
    this.autoReconnect = false;
    this.reconnectAttempts = 0;
  }

  setMaxReconnectAttempts(attempts: number) {
    this.maxReconnectAttempts = attempts;
  }

  setReconnectDelay(delay: number) {
    this.reconnectDelay = delay;
  }

  isDeviceConnected(deviceId: string): boolean {
    return !!this.servers[deviceId];
  }
}