import { Camera } from 'expo-camera'
import { Alert, Linking, Platform } from 'react-native'

/**
 * 检查相机权限
 * @returns Promise<boolean> 是否已授权
 */
export async function hasCameraPermission(): Promise<boolean> {
  if (Platform.OS === 'web') return true
  try {
    const { status } = await Camera.getCameraPermissionsAsync()
    return status === 'granted'
  } catch (e) {
    return false
  }
}

/**
 * 请求相机权限，Promise风格
 * @returns Promise<boolean> 是否已授权
 */
export async function requestCameraPermission(): Promise<boolean> {
  if (Platform.OS === 'web') return true
  try {
    const { status } = await Camera.requestCameraPermissionsAsync()
    return status === 'granted'
  } catch (e) {
    return false
  }
}

/**
 * 如果没有权限则弹窗提示并引导用户去设置
 * @param message 提示内容
 * @returns Promise<boolean> 是否已授权
 */
export async function ensureCameraPermission(message = '需要相机权限，请在设置中开启'): Promise<boolean> {
  const granted = await hasCameraPermission()
  if (granted) return true
  const requested = await requestCameraPermission()
  if (requested) return true
  Alert.alert(
    '权限提示',
    message,
    [
      { text: '取消', style: 'cancel' },
      {
        text: '去设置',
        onPress: () => {
          Linking.openSettings()
        },
      },
    ],
    { cancelable: true },
  )
  return false
}

// 可扩展：请求麦克风、相册等权限