import {NativeEventEmitter, NativeModules} from 'react-native'

const {BluetoothStateManager: NativeBluetoothStateManager} = NativeModules
const bluetoothEventEmitter = new NativeEventEmitter(NativeBluetoothStateManager)

export type BluetoothState =
  | 'PoweredOn'
  | 'PoweredOff'
  | 'Unauthorized'
  | 'Unsupported'
  | 'Resetting'
  | 'Unknown'

export interface BluetoothStateManagerInterface {
  /**
   * Get current Bluetooth state
   * @returns Promise<BluetoothState> Current Bluetooth state
   */
  getState(): Promise<BluetoothState>

  /**
   * Request to enable Bluetooth
   * - Android: Shows dialog asking user to enable Bluetooth
   * - iOS: Not supported, will throw error
   * @returns Promise<void>
   */
  enable(): Promise<void>

  /**
   * Listen for Bluetooth state changes
   * @param callback Function called when Bluetooth state changes
   * @returns Function to remove listener
   */
  onStateChange(callback: (state: BluetoothState) => void): () => void
}

export const BluetoothStateManager: BluetoothStateManagerInterface = {
  getState: () => NativeBluetoothStateManager.getState(),

  enable: () => NativeBluetoothStateManager.requestToEnable(),

  onStateChange: (callback: (state: BluetoothState) => void) => {
    // Get initial state
    NativeBluetoothStateManager.getState()
      .then((currentState: BluetoothState) => {
        callback(currentState)
      })
      .catch((error: any) => {
        console.error('[JS] BluetoothStateManager.subscribe - ERROR: Failed to get current state:', error)
      })

    // Add event listener
    const subscription = bluetoothEventEmitter.addListener('BluetoothStateChanged', callback)

    // Return cleanup function
    return () => {
      subscription.remove()
    }
  },
}