import { ref, onMounted, onUnmounted, onShow } from 'vue'
import { 
  useInit, 
  useGlobalEvent, 
  updateActivePageOnShow,
  cleanupOnPageUnload 
} from '@/utils/useBarcodeModule.js'

/**
 * Vue3 Composable - 条码扫描
 * @param {Object} options 配置选项
 * @param {Function} options.onScan 扫描成功回调
 * @param {Function} options.onError 扫描失败回调
 * @param {boolean} options.autoInit 是否自动初始化
 */
export function useBarcode(options = {}) {
  const {
    onScan,
    onError,
    autoInit = false
  } = options

  // 响应式状态
  const isScanning = ref(false)
  const isInitialized = ref(false)
  const scanResult = ref(null)
  const scanHistory = ref([])
  const error = ref(null)

  // 内部状态
  let removeListener = null

  /**
   * 初始化扫描器
   */
  const init = async () => {
    try {
      if (isInitialized.value) {
        console.warn('扫描器已经初始化')
        return true
      }

      useInit()
      isInitialized.value = true
      error.value = null
      
      console.log('扫描器初始化成功')
      return true
    } catch (err) {
      error.value = err
      if (onError) {
        onError(err)
      }
      console.error('扫描器初始化失败:', err)
      return false
    }
  }

  /**
   * 开始扫描
   */
  const startScan = async () => {
    try {
      // 确保扫描器已初始化
      if (!isInitialized.value) {
        const success = await init()
        if (!success) return false
      }

      if (isScanning.value) {
        console.warn('扫描器已经在运行中')
        return true
      }

      // 注册扫描事件监听
      removeListener = useGlobalEvent(handleScanResult)
      isScanning.value = true
      error.value = null

      console.log('开始扫描监听')
      return true
    } catch (err) {
      error.value = err
      if (onError) {
        onError(err)
      }
      console.error('开始扫描失败:', err)
      return false
    }
  }

  /**
   * 停止扫描
   */
  const stopScan = () => {
    try {
      if (removeListener) {
        removeListener()
        removeListener = null
      }
      
      isScanning.value = false
      console.log('停止扫描监听')
      return true
    } catch (err) {
      error.value = err
      if (onError) {
        onError(err)
      }
      console.error('停止扫描失败:', err)
      return false
    }
  }

  /**
   * 处理扫描结果
   */
  const handleScanResult = (result) => {
    try {
      console.log('收到扫描结果:', result)
      
      // 解析扫描结果
      const barcode = result.barcode || result.data || result.code || String(result)
      const timestamp = new Date().toLocaleString()
      
      const scanData = {
        barcode,
        timestamp,
        rawData: result
      }
      
      // 更新状态
      scanResult.value = scanData
      
      // 添加到历史记录
      scanHistory.value.unshift(scanData)
      
      // 限制历史记录数量
      if (scanHistory.value.length > 100) {
        scanHistory.value = scanHistory.value.slice(0, 100)
      }
      
      // 执行回调
      if (onScan) {
        onScan(scanData)
      }
      
      error.value = null
      
    } catch (err) {
      error.value = err
      if (onError) {
        onError(err)
      }
      console.error('处理扫描结果失败:', err)
    }
  }

  /**
   * 清空扫描历史
   */
  const clearHistory = () => {
    scanHistory.value = []
    scanResult.value = null
  }

  /**
   * 清理资源
   */
  const cleanup = () => {
    stopScan()
    cleanupOnPageUnload()
  }

  // 生命周期钩子
  onMounted(() => {
    if (autoInit) {
      init()
    }
  })

  onShow(() => {
    // 页面显示时更新活跃页面
    updateActivePageOnShow()
  })

  onUnmounted(() => {
    cleanup()
  })

  // 返回API
  return {
    // 状态
    isScanning,
    isInitialized,
    scanResult,
    scanHistory,
    error,
    
    // 方法
    init,
    startScan,
    stopScan,
    clearHistory,
    cleanup
  }
}