flutterApp/lib/features/remote_control/presentation/pages/remote_control_page.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';
import 'package:maibu_satabot_v2/core/consts/tcp_consts.dart';

import '../../../../core/app/app_user_cubit.dart';
import '../../../devices/presentation/bloc/devices_cubit.dart';
import '../bloc/remote_control_cubit.dart';
import '../bloc/remote_control_state.dart';
import '../widgets/center_control_area.dart';
import '../widgets/emergency_overlay.dart';
import '../widgets/left_joystick_area.dart';
import '../widgets/my_video_player.dart';
import '../widgets/right_joystick_area.dart';
import '../widgets/top_status_bar.dart';

class RemoteControlPage extends StatefulWidget {
  const RemoteControlPage({super.key});

  @override
  State<RemoteControlPage> createState() => _RemoteControlPageState();
}

class _RemoteControlPageState extends State<RemoteControlPage> {
  @override
  void initState() {
    super.initState();
    // 1. 锁定横屏
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.landscapeRight,
    ]);
    // 2. 隐藏状态栏和虚拟按键
    SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky);
  }

  @override
  void dispose() {
    SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
    SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    // 监听全局状态（这些通常不随摇杆频繁变化）
    final userState = context.watch<AppUserCubit>().state;
    final deviceState = context.watch<DevicesCubit>().state;
    final currentDevice = deviceState.selectedDevice;

    if (currentDevice == null) {
      return _buildOfflineScaffold();
    }

    return Scaffold(
      backgroundColor: Colors.black,
      body: Stack(
        children: [
          // 【优化层 1】底层视频：传入固定参数，加上 RepaintBoundary
          Positioned.fill(
            child: MyVideoPlayer(
              deviceIp: TCPConsts.TCP_IP,
              device: currentDevice,
              user: userState.user!,
            ),
          ),

          // 【优化层 2】中层：急停效果（只在 isEmergency 变化时才触发显示/隐藏）
          BlocBuilder<RemoteControlCubit, RemoteControlState>(
            buildWhen: (p, c) => p.isEmergency != c.isEmergency,
            builder: (context, state) {
              return state.isEmergency ? const Positioned.fill(child: EmergencyOverlay()) : const SizedBox.shrink();
            },
          ),

          // 【优化层 3】顶层：UI 控制层
          SafeArea(
            child: Column(
              children: [
                const TopStatusBar(),
                Expanded(
                  child: LayoutBuilder(
                    builder: (context, constraints) {
                      final double sideAreaWidth = constraints.maxWidth * 0.25;
                      final double centerAreaWidth = constraints.maxWidth * 0.5;

                      // 关键：使用 BlocBuilder 局部刷新摇杆，不要 watch 整个 Page
                      return BlocBuilder<RemoteControlCubit, RemoteControlState>(
                        // 只有 isLocked 改变时才重构摇杆区域，摇杆坐标改变由内部处理
                        buildWhen: (p, c) => p.isLocked != c.isLocked,
                        builder: (context, remoteState) {
                          return Padding(
                            padding: const EdgeInsets.symmetric(vertical: 10),
                            child: Row(
                              mainAxisAlignment: MainAxisAlignment.end,
                              crossAxisAlignment: CrossAxisAlignment.end,
                              children: [
                                // 左摇杆
                                SizedBox(
                                  width: sideAreaWidth,
                                  child: Align(
                                    alignment: Alignment.bottomCenter,
                                    child: LeftJoystickArea(
                                      isLocked: remoteState.isLocked,
                                      width: sideAreaWidth * 0.5 * 0.7,
                                    ),
                                  ),
                                ),

                                // 中间区
                                SizedBox(
                                  width: centerAreaWidth,
                                  child: Align(
                                    alignment: Alignment.bottomCenter,
                                    child: CenterControlArea(totalWidth: centerAreaWidth),
                                  ),
                                ),

                                // 右摇杆
                                SizedBox(
                                  width: sideAreaWidth,
                                  child: Align(
                                    alignment: Alignment.bottomCenter,
                                    child: RightJoystickArea(
                                      isLocked: remoteState.isLocked,
                                      width: sideAreaWidth * 0.5 * 0.7,
                                    ),
                                  ),
                                ),
                              ],
                            ),
                          );
                        },
                      );
                    },
                  ),
                ),
              ],
            ),
          ),

          // 权限弹窗
          BlocBuilder<RemoteControlCubit, RemoteControlState>(
            buildWhen: (p, c) => p.showPermissionRequestDialog != c.showPermissionRequestDialog,
            builder: (context, state) {
              if (state.showPermissionRequestDialog) {
                return _buildPermissionDialog(context, state);
              }
              return const SizedBox.shrink();
            },
          ),
        ],
      ),
    );
  }

  Widget _buildOfflineScaffold() {
    return Scaffold(
      backgroundColor: Colors.black,
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.signal_wifi_off, color: Colors.white, size: 60),
            const SizedBox(height: 20),
            const Text(
              "设备已断开连接",
              style: TextStyle(color: Colors.white, fontSize: 18),
            ),
            const SizedBox(height: 20),
            ElevatedButton(
              onPressed: () => context.pop(),
              child: const Text("返回"),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildPermissionDialog(
    BuildContext context,
    RemoteControlState state,
  ) {
    return Container(
      color: Colors.black54,
      child: AlertDialog(
        title: const Text("权限变更"),
        content: Text("${state.permissionPlatform}端正请求控制权，同意释放吗？"),
        actions: [
          TextButton(
            onPressed: () =>
                context.read<RemoteControlCubit>().respondPermission(false),
            child: const Text("拒绝"),
          ),
          TextButton(
            onPressed: () =>
                context.read<RemoteControlCubit>().respondPermission(true),
            child: const Text("同意"),
          ),
        ],
      ),
    );
  }
}