starpivot/apps/client/local_plugins/location_service/lib/location_service.dart

import 'package:flutter/services.dart';

class LocationService {
  static final LocationService _instance = LocationService._internal();

  /// 获取单例
  factory LocationService() => _instance;

  // 方法通道
  final MethodChannel _methodChannel = MethodChannel(
    'com.yunqiinnovation.location_service',
  );

  // 内部构造函数
  LocationService._internal();

  /// 检查定位权限
  Future<Map<String, bool>> checkPermission() async {
    try {
      final result = await _methodChannel.invokeMethod<Map>('checkPermission');
      return {
        'hasPermission': result?['hasPermission'] ?? false,
        'hasForegroundPermission': result?['hasForegroundPermission'] ?? false,
        'hasBackgroundPermission': result?['hasBackgroundPermission'] ?? false,
      };
    } catch (e) {
      throw Exception('检查权限失败: $e');
    }
  }

  /// 请求定位权限
  Future<bool> requestPermission() async {
    try {
      final result = await _methodChannel.invokeMethod<Map>(
        'requestPermission',
      );
      return result?['granted'] ?? false;
    } catch (e) {
      throw Exception('请求权限失败: $e');
    }
  }

  /// 检查系统位置服务是否开启
  /// 参数：无
  /// 返回值：true 表示已开启；false 表示未开启或检测失败
  /// 异常：抛出 Exception，表示方法通道调用失败或平台异常
  Future<bool> isLocationServiceEnabled() async {
    try {
      final enabled = await _methodChannel.invokeMethod<bool>(
        'isLocationServiceEnabled',
      );
      return enabled ?? false;
    } catch (e) {
      throw Exception('检查位置服务失败: $e');
    }
  }

  /// 取一次当前位置和省市区（2026-09-25 新增，给百炼 `${location}` 用）。
  ///
  /// **不申请权限**：没权限、超时、定位失败都返回 `{'error': 原因}`，由调用方决定何时申请权限。
  /// 成功返回键：latitude / longitude（double）、province / city / district / street / address
  /// （String，可能为空）。
  Future<Map<String, dynamic>> currentPlace({int timeoutMs = 15000}) async {
    try {
      final r = await _methodChannel.invokeMethod<Map>(
        'getCurrentPlace',
        {'timeoutMs': timeoutMs},
      );
      if (r == null) return {'error': 'empty'};
      return r.map((k, v) => MapEntry('$k', v));
    } on PlatformException catch (e) {
      return {'error': e.message ?? e.code};
    } on MissingPluginException {
      return {'error': 'not_implemented'};
    } catch (e) {
      return {'error': '$e'};
    }
  }

  /// 获取当前位置（按需获取）
  Future<Map<String, dynamic>> location() async {
    try {
      // 先检查权限
      final permissionStatus = await checkPermission();
      if (!permissionStatus['hasPermission']!) {
        // 请求权限
        final granted = await requestPermission();
        if (!granted) {
          throw Exception('用户拒绝了定位权限');
        }
      }

      final result = await _methodChannel.invokeMethod<Map>('location');
      if (result != null) {
        return {
          'latitude': double.tryParse(result['user_lat'] ?? '0.0') ?? 0.0,
          'longitude': double.tryParse(result['user_lng'] ?? '0.0') ?? 0.0,
          'address': result['user_location'] ?? '未知地址',
        };
      }
      throw Exception('获取位置信息失败');
    } catch (e) {
      throw Exception('定位失败: $e');
    }
  }
}