import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:im_flutter_sdk/im_flutter_sdk.dart';

import '../../generated/assets.dart';

/// 通话类型
enum CallType {
  voice, // 语音通话
  video, // 视频通话
}

/// 通话状态
enum CallStatus {
  calling, // 通话中（显示时长）
  missed, // 未接听
  cancelled, // 已取消
  rejected, // 已拒绝
}

class CallItem extends StatelessWidget {
  final EMMessage message;
  final bool isSentByMe;
  final bool showTime;
  final String formattedTime;
  final VoidCallback? onResend;

  const CallItem({
    required this.message,
    required this.isSentByMe,
    required this.showTime,
    required this.formattedTime,
    this.onResend,
    super.key,
  });

  /// 从消息内容中解析通话信息（使用特殊的JSON格式）
  Map<String, dynamic>? _parseCallInfo() {
    try {
      if (message.body.type == MessageType.TXT) {
        final textBody = message.body as EMTextMessageBody;
        final content = textBody.content;
        
        // 检查是否是通话消息（以 [CALL:] 开头）
        if (content != null && content.startsWith('[CALL:]')) {
          final jsonStr = content.substring(7); // 移除 '[CALL:]' 前缀
          return jsonDecode(jsonStr) as Map<String, dynamic>;
        }
      }
    } catch (e) {
      print('解析通话信息失败: $e');
    }
    return null;
  }

  /// 从消息中解析通话类型
  CallType? _getCallType() {
    final callInfo = _parseCallInfo();
    if (callInfo != null) {
      final callTypeStr = callInfo['callType'] as String?;
      if (callTypeStr == 'voice') {
        return CallType.voice;
      } else if (callTypeStr == 'video') {
        return CallType.video;
      }
    }
    return null;
  }

  /// 从消息中解析通话状态
  CallStatus? _getCallStatus() {
    final callInfo = _parseCallInfo();
    if (callInfo != null) {
      final statusStr = callInfo['callStatus'] as String?;
      if (statusStr == 'calling') {
        return CallStatus.calling;
      } else if (statusStr == 'missed') {
        return CallStatus.missed;
      } else if (statusStr == 'cancelled') {
        return CallStatus.cancelled;
      } else if (statusStr == 'rejected') {
        return CallStatus.rejected;
      }
    }
    return CallStatus.missed; // 默认未接听
  }

  /// 获取通话时长（秒）
  int? _getCallDuration() {
    final callInfo = _parseCallInfo();
    if (callInfo != null) {
      return callInfo['callDuration'] as int?;
    }
    return null;
  }

  /// 格式化通话时长
  String _formatDuration(int seconds) {
    final minutes = seconds ~/ 60;
    final secs = seconds % 60;
    if (minutes > 0) {
      return '${minutes}:${secs.toString().padLeft(2, '0')}';
    } else {
      return '${secs}秒';
    }
  }

  /// 获取图标资源
  String _getIconAsset() {
    final callType = _getCallType();
    final callStatus = _getCallStatus();

    if (isSentByMe) {
      // 自己发起的通话
      if (callType == CallType.video) {
        return Assets.imagesSendVideoCall;
      } else {
        return Assets.imagesSendCall;
      }
    } else {
      // 别人发起的通话
      if (callStatus == CallStatus.rejected) {
        return Assets.imagesRejectCall;
      } else {
        return Assets.imagesAcceptCall;
      }
    }
  }

  /// 获取状态文本
  String _getStatusText() {
    final callType = _getCallType();
    final callStatus = _getCallStatus();
    final duration = _getCallDuration();

    if (callStatus == CallStatus.calling && duration != null) {
      // 通话中，显示时长
      return _formatDuration(duration);
    } else if (callStatus == CallStatus.missed) {
      return callType == CallType.video ? '未接听视频通话' : '未接听语音通话';
    } else if (callStatus == CallStatus.cancelled) {
      return callType == CallType.video ? '已取消视频通话' : '已取消语音通话';
    } else if (callStatus == CallStatus.rejected) {
      return callType == CallType.video ? '已拒绝视频通话' : '已拒绝语音通话';
    } else {
      return callType == CallType.video ? '视频通话' : '语音通话';
    }
  }

  @override
  Widget build(BuildContext context) {
    final callType = _getCallType();
    if (callType == null) {
      // 如果解析失败，显示默认文本消息
      return SizedBox.shrink();
    }

    final iconAsset = _getIconAsset();
    final statusText = _getStatusText();
    final callStatus = _getCallStatus();
    final isCalling = callStatus == CallStatus.calling;

    return Column(
      children: [
        // 显示时间
        if (showTime) _buildTimeLabel(),
        Container(
          padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
          child: Row(
            mainAxisAlignment:
                isSentByMe ? MainAxisAlignment.end : MainAxisAlignment.start,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              if (!isSentByMe) _buildAvatar(),
              if (!isSentByMe) SizedBox(width: 8.w),
              // 发送消息时，状态在左侧
              if (isSentByMe)
                Align(
                  alignment: Alignment.center,
                  child: Container(
                    margin: EdgeInsets.only(top: 10.h),
                    child: _buildMessageStatus(),
                  ),
                ),
              if (isSentByMe) SizedBox(width: 10.w),
              // 通话消息容器
              Container(
                constraints: BoxConstraints(maxWidth: 200.w),
                margin: EdgeInsets.only(top: 10.h),
                padding: EdgeInsets.symmetric(
                  horizontal: 16.w,
                  vertical: 12.h,
                ),
                decoration: BoxDecoration(
                  color: isSentByMe ? Color(0xff8E7BF6) : Colors.white,
                  borderRadius: BorderRadius.only(
                    topLeft:
                        isSentByMe ? Radius.circular(12.w) : Radius.circular(0),
                    topRight:
                        isSentByMe ? Radius.circular(0) : Radius.circular(12.w),
                    bottomLeft: Radius.circular(12.w),
                    bottomRight: Radius.circular(12.w),
                  ),
                ),
                child: Row(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    // 图标
                    Image.asset(
                      iconAsset,
                      width: 24.w,
                      height: 24.w,
                      fit: BoxFit.contain,
                    ),
                    SizedBox(width: 8.w),
                    // 状态文本
                    Flexible(
                      child: Text(
                        statusText,
                        style: TextStyle(
                          fontSize: 14.sp,
                          color: isSentByMe ? Colors.white : Colors.black87,
                          fontWeight: isCalling ? FontWeight.w500 : FontWeight.normal,
                        ),
                        maxLines: 2,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ),
                  ],
                ),
              ),
              if (isSentByMe) SizedBox(width: 8.w),
              if (isSentByMe) _buildAvatar(),
            ],
          ),
        ),
      ],
    );
  }

  // 构建时间标签
  Widget _buildTimeLabel() {
    return Container(
      alignment: Alignment.center,
      padding: EdgeInsets.symmetric(horizontal: 16.w),
      child: Container(
        padding: EdgeInsets.symmetric(horizontal: 12.w),
        child: Text(
          formattedTime,
          style: TextStyle(fontSize: 12.sp, color: Colors.grey),
        ),
      ),
    );
  }

  // 构建头像
  Widget _buildAvatar() {
    return Container(
      width: 40.w,
      height: 40.w,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(20.w),
        image: DecorationImage(
          image: AssetImage(Assets.imagesAvatarsExample),
          fit: BoxFit.cover,
        ),
      ),
    );
  }

  // 构建消息状态（发送中、已发送、失败重发）
  Widget _buildMessageStatus() {
    if (!isSentByMe) {
      return SizedBox.shrink();
    }

    final status = message.status;

    if (status == MessageStatus.FAIL) {
      // 发送失败，显示重发按钮
      return GestureDetector(
        onTap: onResend,
        child: Container(
          width: 20.w,
          height: 20.w,
          decoration: BoxDecoration(
            color: Colors.red.withOpacity(0.1),
            shape: BoxShape.circle,
          ),
          child: Icon(
            Icons.refresh,
            size: 14.w,
            color: Colors.red,
          ),
        ),
      );
    } else if (status == MessageStatus.PROGRESS) {
      // 发送中，显示加载动画
      return Container(
        width: 16.w,
        height: 16.w,
        child: CircularProgressIndicator(
          strokeWidth: 2,
          valueColor: AlwaysStoppedAnimation<Color>(Colors.grey),
        ),
      );
    } else {
      // 发送成功，不显示任何状态
      return SizedBox.shrink();
    }
  }
}