import 'package:agora_rtc_engine/agora_rtc_engine.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:dating_touchme_app/controller/message/call_controller.dart';
import 'package:dating_touchme_app/extension/ex_widget.dart';
import 'package:dating_touchme_app/generated/assets.dart';
import 'package:dating_touchme_app/pages/message/video_call_page.dart';
import 'package:dating_touchme_app/rtc/rtc_manager.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';
import 'package:im_flutter_sdk/im_flutter_sdk.dart';

/// 视频通话小窗组件
class VideoCallOverlayWidget extends StatefulWidget {
  final VoidCallback? onClose;
  final String targetUserId;
  final String? targetUserName;
  final String? targetAvatarUrl;
  final EMMessage? message;

  const VideoCallOverlayWidget({
    super.key,
    this.onClose,
    required this.targetUserId,
    this.targetUserName,
    this.targetAvatarUrl,
    this.message,
  });

  @override
  State<VideoCallOverlayWidget> createState() => _VideoCallOverlayWidgetState();
}

class _VideoCallOverlayWidgetState extends State<VideoCallOverlayWidget> {
  Offset _position = Offset.zero;
  bool _isDragging = false;
  final CallController _callController = CallController.instance;
  final RTCManager _rtcManager = RTCManager.instance;

  @override
  void initState() {
    super.initState();
    // 初始位置设置为右上角
    WidgetsBinding.instance.addPostFrameCallback((_) {
      final size = MediaQuery.of(context).size;
      setState(() {
        _position = Offset(
          size.width - 100.w,
          100,
        );
      });
    });
  }

  /// 吸附到边缘
  void _snapToEdge(double screenWidth) {
    final centerX = screenWidth / 2;
    final targetX = _position.dx < centerX
        ? 0.0
        : screenWidth - 100.w;

    setState(() {
      _position = Offset(targetX, _position.dy);
      _isDragging = false;
    });
  }

  /// 构建背景（视频或头像）
  Widget _buildBackground() {
    return Obx(() {
      // 在 Obx 中访问响应式变量，确保建立监听关系
      final callSession = _callController.currentCall.value;
      final isVideoCall = callSession != null && callSession.callType == CallType.video;
      final isConnected = callSession != null && _callController.callDurationSeconds.value > 0;
      final remoteUid = _callController.remoteUid.value;
      final remoteUsers = _rtcManager.remoteUsersNotifier.value;
      
      // 如果是视频通话且已接通，显示远端视频
      if (isVideoCall && isConnected && remoteUid != null) {
        final engine = _rtcManager.engine;
        if (engine != null) {
          final remoteVideoViewController = VideoViewController(
            rtcEngine: engine,
            canvas: VideoCanvas(uid: remoteUid),
          );
          return SizedBox(
            width: 100.w,
            height: 100.w,
            child: AgoraVideoView(
              controller: remoteVideoViewController,
            ),
          );
        }
      }
      
      // 如果 remoteUid 为空，尝试从 RTCManager 的远端用户列表中获取
      if (isVideoCall && isConnected && remoteUid == null && remoteUsers.isNotEmpty) {
        final firstRemoteUid = remoteUsers.first;
        final engine = _rtcManager.engine;
        if (engine != null) {
          _callController.remoteUid.value = firstRemoteUid;
          final remoteVideoViewController = VideoViewController(
            rtcEngine: engine,
            canvas: VideoCanvas(uid: firstRemoteUid),
          );
          return SizedBox(
            width: 100.w,
            height: 100.w,
            child: AgoraVideoView(
              controller: remoteVideoViewController,
            ),
          );
        }
      }
      
      // 默认显示头像
      return Container(
        width: 100.w,
        height: 100.w,
        color: Colors.black,
        child: widget.targetAvatarUrl != null && widget.targetAvatarUrl!.isNotEmpty
            ? CachedNetworkImage(
                imageUrl: widget.targetAvatarUrl!,
                fit: BoxFit.cover,
                errorWidget: (context, url, error) => Image.asset(
                  Assets.imagesUserAvatar,
                  fit: BoxFit.cover,
                ),
              )
            : Image.asset(
                Assets.imagesUserAvatar,
                fit: BoxFit.cover,
              ),
      );
    });
  }

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

  @override
  Widget build(BuildContext context) {
    final screenSize = MediaQuery.of(context).size;

    return AnimatedPositioned(
      duration: _isDragging
          ? const Duration(milliseconds: 50)
          : const Duration(milliseconds: 300),
      curve: _isDragging ? Curves.linear : Curves.easeOut,
      left: _position.dx,
      top: _position.dy,
      child: _buildContent(screenSize),
    );
  }

  Widget _buildContent(Size screenSize) {
    return GestureDetector(
      onPanStart: (details) {
        setState(() {
          _isDragging = true;
        });
      },
      onPanUpdate: (details) {
        setState(() {
          _position += details.delta;
          _position = Offset(
            _position.dx.clamp(0.0, screenSize.width - 100.w),
            _position.dy.clamp(0.0, screenSize.height - 100.w),
          );
        });
      },
      onPanEnd: (details) {
        _snapToEdge(screenSize.width);
      },
      child: Obx(() {
        final callSession = _callController.currentCall.value;
        final isConnected = callSession != null && _callController.callDurationSeconds.value > 0;
        final callDuration = _callController.callDurationSeconds.value;

        return Container(
          width: 100.w,
          height: 100.w,
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(8.w),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withOpacity(0.3),
                blurRadius: 8,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: ClipRRect(
            borderRadius: BorderRadius.circular(8.w),
            child: Stack(
              children: [
                // 背景：视频通话接通时显示远端视频，否则显示头像
                _buildBackground(),
                // 半透明遮罩
                Container(
                  color: Colors.black.withOpacity(0.4),
                ),
                // 内容：昵称和状态
                Positioned(
                  bottom: 8.w,
                  left: 4.w,
                  right: 4.w,
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      // 昵称
                      Text(
                        widget.targetUserName ?? widget.targetUserId,
                        style: TextStyle(
                          color: Colors.white,
                          fontSize: 10.sp,
                          fontWeight: FontWeight.w600,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                      SizedBox(height: 2.h),
                      // 通话状态
                      Text(
                        isConnected ? _formatDuration(callDuration) : '通话中',
                        style: TextStyle(
                          color: Colors.white.withOpacity(0.9),
                          fontSize: 8.sp,
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ).onTap(() {
          Get.log("点击小窗${widget.message}");
          // 点击小窗，返回视频通话页面
          Get.to(() => VideoCallPage(
            targetUserId: widget.targetUserId,
            callMessage: widget.message,
            isInitiator: callSession?.isInitiator ?? CallController.instance.callRole == CallRole.caller ? true : false,
          ));
          widget.onClose?.call();
        });
      }),
    );
  }
}