import 'dart:convert';
import 'dart:typed_data';

import 'package:appframe/config/constant.dart';
import 'package:appframe/config/locator.dart';
import 'package:appframe/data/repositories/user_auth_repository.dart';
import 'package:appframe/data/repositories/wechat_auth_repository.dart';
import 'package:appframe/utils/login_util.dart';
import 'package:crypto/crypto.dart';
import 'package:flutter/material.dart';
import 'package:fluwx/fluwx.dart';
import 'package:shared_preferences/shared_preferences.dart';

///
/// 微信二维码绑定弹窗
/// 内部自管理二维码生成、扫码回调、绑定请求等完整流程
///
class WechatQrBindDialog extends StatefulWidget {
  @override
  State<WechatQrBindDialog> createState() => _WechatQrBindDialogState();
}

class _WechatQrBindDialogState extends State<WechatQrBindDialog> {
  // 0: 加载中  1: 显示二维码  2: 已扫码待确认  3: 用户取消  4: 过期/错误  5: 绑定成功
  int _status = 0;
  String _tip = '正在生成二维码...';
  Uint8List? _qrImage;

  late final Fluwx _fluwx;
  late final FluwxCancelable _fluwxCancelable;
  late final WechatAuthRepository _wechatAuthRepository;
  late final UserAuthRepository _userAuthRepository;

  @override
  void initState() {
    super.initState();
    _fluwx = getIt.get<Fluwx>();
    _wechatAuthRepository = getIt.get<WechatAuthRepository>();
    _userAuthRepository = getIt.get<UserAuthRepository>();
    _fluwxCancelable = _fluwx.addSubscriber(_responseListener);
    _initQrCode();
  }

  Future<void> _initQrCode() async {
    try {
      var resultData = await _wechatAuthRepository.getTicket() as Map<String, dynamic>?;
      if (resultData == null) {
        _setError('生成二维码失败');
        return;
      }
      if (resultData['resultCode'] != '001') {
        _setError('生成二维码状态错误');
        return;
      }

      var sdkTicket = resultData['data'];
      var timestamp = DateTime.now().millisecondsSinceEpoch;
      var signature = _sig(Constant.wxAppId, '$timestamp', sdkTicket, '$timestamp');

      var authResult = await _fluwx.authBy(
        which: QRCode(
          appId: Constant.wxAppId,
          scope: 'snsapi_userinfo',
          nonceStr: '$timestamp',
          timestamp: '$timestamp',
          signature: signature,
        ),
      );

      if (!authResult) {
        _setError('请求微信失败');
      }
    } catch (e) {
      debugPrint('wechatQrBind initQrCode error: $e');
      _setError('生成二维码异常');
    }
  }

  void _responseListener(WeChatResponse response) async {
    if (response is WeChatAuthGotQRCodeResponse) {
      int? errCode = response.errCode;
      if (errCode != null && errCode == 0) {
        if (!mounted) return;
        setState(() {
          _status = 1;
          _qrImage = response.qrCode;
          _tip = '打开微信，扫描二维码绑定';
        });
      } else {
        _setError('错误 $errCode');
      }
    } else if (response is WeChatQRCodeScannedResponse) {
      int? errCode = response.errCode;
      if (errCode != null && errCode == 0) {
        if (!mounted) return;
        setState(() {
          _status = 2;
          _tip = '在微信中轻触允许即可绑定';
        });
      } else {
        _setError('错误 $errCode');
      }
    } else if (response is WeChatAuthByQRCodeFinishedResponse) {
      int? errCode = response.errCode;
      if (errCode != null && errCode == 0) {
        await _doBind(response.authCode!);
      } else if (errCode == -4) {
        if (!mounted) return;
        setState(() {
          _status = 3;
          _tip = '你已取消此次绑定';
        });
      } else {
        if (!mounted) return;
        setState(() {
          _status = 4;
          _tip = '请刷新二维码，重新绑定';
        });
      }
    }
  }

  Future<void> _doBind(String code) async {
    try {
      var resultData = await _wechatAuthRepository.codeToSk(code) as Map<String, dynamic>?;
      if (resultData == null) {
        _setError('绑定请求处理失败');
        return;
      }
      if (resultData['resultCode'] != '001') {
        _setError('绑定请求状态失败');
        return;
      }

      var data = resultData['data'] as Map<String, dynamic>;
      var wechatUserCode = data['userCode'] as String;

      var sharedPreferences = getIt.get<SharedPreferences>();
      var visitorId = sharedPreferences.getString('auth_visitor_id') ?? '';
      var visitorType = sharedPreferences.getString('auth_visitor_type') ?? '';

      if (visitorId.isEmpty || visitorType.isEmpty) {
        _setError('用户信息获取失败，请重新登录');
        return;
      }

      if (visitorType != 'apple' && visitorType != 'phone') {
        _setError('用户信息错误，请重新登录');
        return;
      }

      var bindResult = await _userAuthRepository.newBinding(
        visitorId,
        wechatUserCode,
        visitorType,
      ) as Map<String, dynamic>?;

      if (!mounted) return;
      if (bindResult != null && bindResult['code'] == 0) {
        setState(() {
          _status = 5;
          _tip = '微信绑定成功';
        });
        // 延迟关闭弹窗
        Future.delayed(const Duration(milliseconds: 1200), () {
          if (mounted) Navigator.of(context).pop();
        });

        LoginUtil.handleLoginSuccess(data, 0, 'reload');

      } else {
        var errorMsg = bindResult?['error'] ?? '微信绑定失败';
        _setError(errorMsg);
      }
    } catch (e) {
      debugPrint('wechatQrBind doBind error: $e');
      _setError('微信绑定异常');
    }
  }

  void _setError(String tip) {
    if (!mounted) return;
    setState(() {
      _status = 4;
      _tip = tip;
    });
  }

  Future<void> _refresh() async {
    setState(() {
      _status = 0;
      _tip = '正在重新生成二维码...';
      _qrImage = null;
    });
    try {
      _fluwx.stopAuthByQRCode();
    } catch (e) {
      debugPrint('stopAuthByQRCode error: $e');
    }
    await _initQrCode();
  }

  String _sig(String appId, String nonceStr, String sdkTicket, String timestamp) {
    String str = 'appid=$appId&noncestr=$nonceStr&sdk_ticket=$sdkTicket&timestamp=$timestamp';
    return sha1.convert(utf8.encode(str)).toString();
  }

  @override
  void dispose() {
    _fluwxCancelable.cancel();
    try {
      _fluwx.stopAuthByQRCode();
    } catch (e) {
      debugPrint('stopAuthByQRCode error: $e');
    }
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Dialog(
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(16),
      ),
      child: Container(
        width: 300,
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 28),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(
              '微信扫码绑定',
              style: TextStyle(
                fontSize: 17,
                fontWeight: FontWeight.bold,
                color: Color(0xFF333333),
              ),
            ),
            const SizedBox(height: 20),
            SizedBox(
              height: 230,
              child: _buildContent(),
            ),
            const SizedBox(height: 16),
            // 底部按钮区域
            _buildBottomActions(),
          ],
        ),
      ),
    );
  }

  Widget _buildContent() {
    if (_status == 0) {
      // 加载中
      return Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const SizedBox(
            width: 48,
            height: 48,
            child: CircularProgressIndicator(
              color: Color(0xFF7691FA),
              strokeWidth: 3,
            ),
          ),
          const SizedBox(height: 16),
          Text(
            _tip,
            style: TextStyle(fontSize: 14, color: Color(0xFF666666)),
            textAlign: TextAlign.center,
          ),
        ],
      );
    } else if (_status == 1) {
      // 显示二维码
      return Column(
        children: [
          Container(
            width: 190,
            height: 190,
            decoration: BoxDecoration(
              border: Border.all(color: Color(0x29265ECF), width: 0.5),
              borderRadius: BorderRadius.circular(12),
            ),
            child: ClipRRect(
              borderRadius: BorderRadius.circular(12),
              child: Image.memory(_qrImage!, width: 190, height: 190),
            ),
          ),
          const SizedBox(height: 8),
          Text(
            _tip,
            style: TextStyle(fontSize: 14, color: Color(0xFF333333)),
            textAlign: TextAlign.center,
          ),
        ],
      );
    } else if (_status == 2) {
      // 已扫码，等待确认
      return Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(Icons.check_circle, color: Color(0xFF07C160), size: 64),
          const SizedBox(height: 12),
          Text(
            '已扫码',
            style: TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.bold,
              color: Color(0xFF333333),
            ),
          ),
          const SizedBox(height: 8),
          Text(
            _tip,
            style: TextStyle(fontSize: 14, color: Color(0xFF666666)),
            textAlign: TextAlign.center,
          ),
        ],
      );
    } else if (_status == 3) {
      // 用户取消
      return Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(Icons.cancel, color: Color(0xFFE64340), size: 64),
          const SizedBox(height: 12),
          Text(
            '已取消绑定',
            style: TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.bold,
              color: Color(0xFF333333),
            ),
          ),
          const SizedBox(height: 8),
          Text(
            _tip,
            style: TextStyle(fontSize: 14, color: Color(0xFF666666)),
            textAlign: TextAlign.center,
          ),
        ],
      );
    } else if (_status == 4) {
      // 错误/过期
      return Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(Icons.error_outline, color: Color(0xFFE64340), size: 64),
          const SizedBox(height: 12),
          Text(
            '绑定失败',
            style: TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.bold,
              color: Color(0xFF333333),
            ),
          ),
          const SizedBox(height: 8),
          Text(
            _tip,
            style: TextStyle(fontSize: 14, color: Color(0xFF666666)),
            textAlign: TextAlign.center,
          ),
        ],
      );
    } else if (_status == 5) {
      // 绑定成功
      return Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(Icons.check_circle, color: Color(0xFF07C160), size: 64),
          const SizedBox(height: 12),
          Text(
            _tip,
            style: TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.bold,
              color: Color(0xFF07C160),
            ),
          ),
        ],
      );
    }
    return SizedBox.shrink();
  }

  Widget _buildBottomActions() {
    if (_status == 1 || _status == 2) {
      // 二维码显示中，提供关闭按钮
      return TextButton(
        onPressed: () => Navigator.of(context).pop(),
        child: Text(
          '取消',
          style: TextStyle(fontSize: 15, color: Color(0xFF999999)),
        ),
      );
    } else if (_status == 3 || _status == 4) {
      // 取消或错误，提供重试和关闭按钮
      return Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          TextButton(
            onPressed: _refresh,
            child: Text(
              '重试',
              style: TextStyle(fontSize: 15, color: Color(0xFF7691FA)),
            ),
          ),
          const SizedBox(width: 16),
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: Text(
              '关闭',
              style: TextStyle(fontSize: 15, color: Color(0xFF999999)),
            ),
          ),
        ],
      );
    }
    return SizedBox.shrink();
  }
}