/**
 * 微信开放标签封装组件
 * 用于在微信内 H5 跳转小程序
 */
import React, { useState, useEffect, useCallback, useRef } from 'react';
import { Box, Spinner, Text, Button as ChakraButton } from '@chakra-ui/react';
import { getJsSdkConfig } from '@services/miniprogramService';

// 小程序原始 ID
const MINIPROGRAM_ORIGINAL_ID = 'gh_fd2fd8dd2fb5';

/**
 * 微信开放标签组件
 * @param {Object} props
 * @param {string} [props.path] - 小程序页面路径
 * @param {string} [props.query] - 页面参数
 * @param {React.ReactNode} props.children - 按钮内容
 * @param {Function} [props.onLaunch] - 跳转成功回调
 * @param {Function} [props.onError] - 跳转失败回调
 * @param {Object} [props.buttonStyle] - 按钮样式
 */
const WxOpenLaunchWeapp = ({
  path = '',
  query = '',
  children,
  onLaunch,
  onError,
  buttonStyle = {},
}) => {
  const [ready, setReady] = useState(false);
  const [error, setError] = useState(null);
  const [loading, setLoading] = useState(true);
  const launchBtnRef = useRef(null);

  // 初始化微信 JS-SDK
  const initWxSdk = useCallback(async () => {
    try {
      setLoading(true);
      setError(null);

      // 获取当前页面 URL（不含 hash）
      const currentUrl = window.location.href.split('#')[0];

      // 获取签名配置
      const config = await getJsSdkConfig(currentUrl);

      if (!config) {
        throw new Error('获取签名配置失败');
      }

      // 检查 wx 对象是否存在
      if (typeof wx === 'undefined') {
        throw new Error('微信 JS-SDK 未加载');
      }

      // 配置 wx
      wx.config({
        debug: false,
        appId: config.appId,
        timestamp: config.timestamp,
        nonceStr: config.nonceStr,
        signature: config.signature,
        jsApiList: config.jsApiList || [],
        openTagList: config.openTagList || ['wx-open-launch-weapp'],
      });

      // 监听 ready 事件
      wx.ready(() => {
        console.log('[WxOpenLaunchWeapp] wx.ready');
        setReady(true);
        setLoading(false);
      });

      // 监听 error 事件
      wx.error((err) => {
        console.error('[WxOpenLaunchWeapp] wx.error:', err);
        setError(err.errMsg || '初始化失败');
        setLoading(false);
      });

    } catch (err) {
      console.error('[WxOpenLaunchWeapp] initWxSdk error:', err);
      setError(err.message || '初始化失败');
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    initWxSdk();
  }, [initWxSdk]);

  // 监听开放标签事件
  useEffect(() => {
    const btn = launchBtnRef.current;
    if (!btn) return;

    const handleLaunch = (e) => {
      console.log('[WxOpenLaunchWeapp] launch success:', e.detail);
      onLaunch?.(e.detail);
    };

    const handleError = (e) => {
      console.error('[WxOpenLaunchWeapp] launch error:', e.detail);
      onError?.(e.detail);
    };

    btn.addEventListener('launch', handleLaunch);
    btn.addEventListener('error', handleError);

    return () => {
      btn.removeEventListener('launch', handleLaunch);
      btn.removeEventListener('error', handleError);
    };
  }, [ready, onLaunch, onError]);

  // 构建小程序路径
  const mpPath = query ? `${path}?${query}` : path;

  // 默认按钮样式
  const defaultButtonStyle = {
    display: 'flex',
    alignItems: 'center',
    justifyContent: 'center',
    padding: '12px 24px',
    backgroundColor: '#07c160',
    color: '#ffffff',
    fontSize: '16px',
    fontWeight: '500',
    borderRadius: '8px',
    border: 'none',
    cursor: 'pointer',
    width: '100%',
    ...buttonStyle,
  };

  // 加载中状态
  if (loading) {
    return (
      <Box display="flex" alignItems="center" justifyContent="center" py={3}>
        <Spinner size="sm" mr={2} />
        <Text fontSize="sm" color="gray.500">正在初始化...</Text>
      </Box>
    );
  }

  // 错误状态
  if (error) {
    return (
      <ChakraButton
        colorScheme="gray"
        isDisabled
        width="100%"
        py={3}
      >
        {error}
      </ChakraButton>
    );
  }

  // 渲染开放标签
  if (ready) {
    // 微信开放标签需要使用纯 HTML 字符串，不支持 JSX
    const buttonText = typeof children === 'string' ? children : '打开小程序';
    const htmlContent = `
      <style>
        .wx-launch-btn {
          display: flex;
          align-items: center;
          justify-content: center;
          padding: ${defaultButtonStyle.padding};
          background-color: ${defaultButtonStyle.backgroundColor};
          color: ${defaultButtonStyle.color};
          font-size: ${defaultButtonStyle.fontSize};
          font-weight: ${defaultButtonStyle.fontWeight};
          border-radius: ${defaultButtonStyle.borderRadius};
          border: none;
          cursor: pointer;
          width: 100%;
          box-sizing: border-box;
        }
      </style>
      <button class="wx-launch-btn">${buttonText}</button>
    `;

    return (
      <Box position="relative">
        <wx-open-launch-weapp
          ref={launchBtnRef}
          id="launch-btn"
          username={MINIPROGRAM_ORIGINAL_ID}
          path={mpPath}
          style={{ display: 'block', width: '100%' }}
        >
          <script type="text/wxtag-template" dangerouslySetInnerHTML={{ __html: htmlContent }} />
        </wx-open-launch-weapp>
      </Box>
    );
  }

  return null;
};

export default WxOpenLaunchWeapp;