feature-next-arch/lib/features/home/presentation/widgets/map/test_amap_page.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong2/latlong.dart';
import 'package:geolocator/geolocator.dart';
import 'package:permission_handler/permission_handler.dart';

import 'CoordTransform/coord_transform.dart';

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

  @override
  State<AmapFlutterMapPage> createState() => _AmapFlutterMapPageState();
}

class _AmapFlutterMapPageState extends State<AmapFlutterMapPage> {
  final MapController _mapController = MapController();
  static const String amapKey = "bbb1f0f20eed6bf679eddf2625630aba";

  LatLng _currentCenter = const LatLng(39.908823, 116.397470);
  bool _isLoading = true;
  // 新增：标记页面是否已销毁，防止异步操作访问已释放的控制器
  bool _isDisposed = false;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _checkAndGetLocation();
    });
  }

  // 新增：页面销毁时标记状态
  @override
  void dispose() {
    _isDisposed = true; // 先标记销毁状态
    // _mapController.dispose(); // 再销毁控制器
    super.dispose();
  }

  Future<void> _checkAndGetLocation() async {
    var status = await Permission.location.status;
    if (status.isDenied) {
      status = await Permission.location.request();
      if (status.isDenied) {
        if (!_isDisposed) { // 防护：页面没销毁才弹提示
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('定位权限被拒绝，无法获取当前位置')),
          );
          setState(() { _isLoading = false; });
        }
        return;
      }
    }

    if (status.isPermanentlyDenied) {
      if (!_isDisposed) { // 防护：页面没销毁才弹提示
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('定位权限被永久拒绝，请去设置开启'),
            action: SnackBarAction(label: '去设置', onPressed: openAppSettings),
          ),
        );
        setState(() { _isLoading = false; });
      }
      return;
    }

    await _getCurrentLocation();
  }

  Future<void> _getCurrentLocation() async {
    if (_isDisposed) return;

    setState(() { _isLoading = true; });
    print('📍 开始定位...');

    bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
    if (!serviceEnabled) {
      if (!_isDisposed) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('定位服务未启用，请开启定位服务')),
        );
        setState(() { _isLoading = false; });
      }
      return;
    }

    try {
      final position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.bestForNavigation,
        forceAndroidLocationManager: true,
        timeLimit: const Duration(seconds: 8),
      );

      if (_isDisposed) return;

      // ⭐⭐⭐ 关键修复点：WGS84 → GCJ02 ⭐⭐⭐
      final gcjPoint = CoordTransform.wgs84ToGcj02(
        position.latitude,
        position.longitude,
      );

      setState(() {
        _currentCenter = gcjPoint;
        _isLoading = false;
      });

      if (!_isDisposed) {
        _mapController.move(gcjPoint, 15.0);
      }

      print('✅ 定位成功(GCJ02): ${gcjPoint.latitude}, ${gcjPoint.longitude}');
    } catch (e) {
      if (!_isDisposed) {
        setState(() { _isLoading = false; });
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('定位失败: $e'),
            action: SnackBarAction(
              label: '重试',
              onPressed: _checkAndGetLocation,
            ),
          ),
        );
      }
    }
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('路径规划'),
        actions: [
          IconButton(
            icon: const Icon(Icons.my_location),
            onPressed: _checkAndGetLocation,
            tooltip: '定位到我的位置',
          ),
        ],
      ),
      body: _isLoading
          ? const Center(child: CircularProgressIndicator())
          : FlutterMap(
        mapController: _mapController,
        options: MapOptions(
          center: _currentCenter,
          zoom: 15.0,
          minZoom: 3.0,
          maxZoom: 18.0,
          interactiveFlags: InteractiveFlag.all,
        ),
        children: [
          TileLayer(
            urlTemplate:
            "https://webrd0{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}&key=$amapKey",
            subdomains: const ['1', '2', '3', '4'],
            tileProvider: NetworkTileProvider(),
          ),
          MarkerLayer(
            markers: [
              Marker(
                point: _currentCenter,
                width: 40,
                height: 40,
                child: const Icon(Icons.location_on, color: Colors.red, size: 40),
              ),
            ],
          ),
        ],
      ),
    );
  }
}