import { useState, useCallback, useRef, useEffect } from 'react';
import Taro from '@tarojs/taro';
import {
  confirmWechatQRLogin,
  parseQRContent,
  type ConfirmLoginResult
} from '@/api/qr-login';

/**
 * 扫码登录状态
 */
export enum ScanLoginState {
  IDLE = 'idle',           // 空闲状态
  SCANNING = 'scanning',   // 正在扫码
  CONFIRMING = 'confirming', // 正在确认登录
  SUCCESS = 'success',     // 登录成功
  ERROR = 'error'          // 登录失败
}

/**
 * 扫码登录Hook
 */
export function useQRLogin() {
  const [state, setState] = useState<ScanLoginState>(ScanLoginState.IDLE);
  const [error, setError] = useState<string>('');
  const [result, setResult] = useState<ConfirmLoginResult | null>(null);
  const [isLoading, setIsLoading] = useState(false);

  // 用于取消操作的引用
  const cancelRef = useRef<boolean>(false);

  /**
   * 重置状态
   */
  const reset = useCallback(() => {
    setState(ScanLoginState.IDLE);
    setError('');
    setResult(null);
    setIsLoading(false);
    cancelRef.current = false;
  }, []);

  /**
   * 开始扫码登录
   */
  const startScan = useCallback(async () => {
    try {
      reset();
      setState(ScanLoginState.SCANNING);

      // 检查用户是否已登录
      const userId = Taro.getStorageSync('UserId');
      if (!userId) {
        throw new Error('请先登录小程序');
      }

      // 调用扫码API
      const scanResult = await new Promise<string>((resolve, reject) => {
        Taro.scanCode({
          onlyFromCamera: true,
          scanType: ['qrCode'],
          success: (res) => {
            if (res.result) {
              resolve(res.result);
            } else {
              reject(new Error('扫码结果为空'));
            }
          },
          fail: (err) => {
            reject(new Error(err.errMsg || '扫码失败'));
          }
        });
      });

      // 检查是否被取消
      if (cancelRef.current) {
        return;
      }

      // 解析二维码内容
      const token = parseQRContent(scanResult);
      console.log('解析二维码内容2:',token)
      if (!token) {
        throw new Error('无效的登录二维码');
      }

      // 确认登录
      setState(ScanLoginState.CONFIRMING);
      setIsLoading(true);

      const confirmResult = await confirmWechatQRLogin(token, parseInt(userId));
      console.log(confirmResult,'confirmResult>>>>')
      if (cancelRef.current) {
        return;
      }

      if (confirmResult.success) {
        setState(ScanLoginState.SUCCESS);
        setResult(confirmResult);

        // 显示成功提示
        Taro.showToast({
          title: '登录确认成功',
          icon: 'success',
          duration: 2000
        });
      } else {
        throw new Error(confirmResult.message || '登录确认失败');
      }

    } catch (err: any) {
      if (!cancelRef.current) {
        setState(ScanLoginState.ERROR);
        const errorMessage = err.message || '扫码登录失败';
        setError(errorMessage);

        // 显示错误提示
        Taro.showToast({
          title: errorMessage,
          icon: 'error',
          duration: 3000
        });
      }
    } finally {
      setIsLoading(false);
    }
  }, [reset]);

  /**
   * 取消扫码登录
   */
  const cancel = useCallback(() => {
    cancelRef.current = true;
    reset();
  }, [reset]);

  /**
   * 处理扫码结果（用于已有扫码结果的情况）
   */
  const handleScanResult = useCallback(async (qrContent: string) => {
    try {
      reset();
      setState(ScanLoginState.CONFIRMING);
      setIsLoading(true);

      // 检查用户是否已登录
      const userId = Taro.getStorageSync('UserId');
      if (!userId) {
        throw new Error('请先登录小程序');
      }

      // 解析二维码内容
      const token = parseQRContent(qrContent);
      if (!token) {
        throw new Error('无效的登录二维码');
      }

      // 确认登录
      const confirmResult = await confirmWechatQRLogin(token, parseInt(userId));

      if (confirmResult.success) {
        setState(ScanLoginState.SUCCESS);
        setResult(confirmResult);

        // 显示成功提示
        Taro.showToast({
          title: '登录确认成功',
          icon: 'success',
          duration: 2000
        });
      } else {
        throw new Error(confirmResult.message || '登录确认失败');
      }

    } catch (err: any) {
      setState(ScanLoginState.ERROR);
      const errorMessage = err.message || '登录确认失败';
      setError(errorMessage);

      // 显示错误提示
      Taro.showToast({
        title: errorMessage,
        icon: 'error',
        duration: 3000
      });
    } finally {
      setIsLoading(false);
    }
  }, [reset]);

  /**
   * 检查是否可以进行扫码登录
   */
  const canScan = useCallback(() => {
    const userId = Taro.getStorageSync('UserId');
    const accessToken = Taro.getStorageSync('access_token');
    return !!(userId && accessToken);
  }, []);

  // 组件卸载时取消操作
  useEffect(() => {
    return () => {
      cancelRef.current = true;
    };
  }, []);

  return {
    // 状态
    state,
    error,
    result,
    isLoading,

    // 方法
    startScan,
    cancel,
    reset,
    handleScanResult,
    canScan,

    // 便捷状态判断
    isIdle: state === ScanLoginState.IDLE,
    isScanning: state === ScanLoginState.SCANNING,
    isConfirming: state === ScanLoginState.CONFIRMING,
    isSuccess: state === ScanLoginState.SUCCESS,
    isError: state === ScanLoginState.ERROR
  };
}