Clean/plugins/classify_photo/lib/classify_photo_method_channel.dart

import 'dart:ffi';

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

import 'classify_photo_platform_interface.dart';

/// An implementation of [ClassifyPhotoPlatform] that uses method channels.
class MethodChannelClassifyPhoto extends ClassifyPhotoPlatform {
  /// The method channel used to interact with the native platform.
  @visibleForTesting
  final methodChannel = const MethodChannel('classify_photo');

  @override
  Future<String?> getPlatformVersion() async {
    final version = await methodChannel.invokeMethod<String>('getPlatformVersion');
    return version;
  }

  @override
  Future<bool> checkTrialEligibility() async {
    try {
      // 调用原生方法并处理可能的空值
      final result = await methodChannel.invokeMethod<bool>('checkTrialEligibility');
      return result ?? false; // 如果结果为 null，返回 false
    } on PlatformException catch (e) {
      print('检查试用资格失败: ${e.message}');
      return false; // 发生错误时返回 false
    } catch (e) {
      print('未知错误: $e');
      return false; // 其他错误情况返回 false
    }
  }

  @override
  Future<List<Map<String, dynamic>>?> getPhoto() async {
    try {
      print('Flutter: 调用 getPhoto 方法');
      final List<dynamic>? result = await methodChannel.invokeMethod<List<dynamic>>(
        'getPhoto',
      );

      print('Flutter: 收到原生返回结果: $result');

      if (result == null) {
        print('Flutter: 结果为空');
        return null;
      }

      return result.map((group) => Map<String, dynamic>.from(group)).toList();
    } on PlatformException catch (e) {
      print('Flutter: Platform Exception: ${e.message}');
      rethrow;
    } catch (e) {
      print('Flutter: Error: $e');
      rethrow;
    }
  }

  // 实现获取存储信息的方法
  @override
  Future<Map<String, int>> getStorageInfo() async {
    try {
      final result = await methodChannel.invokeMethod<Map<dynamic, dynamic>>('getStorageInfo');
      if (result == null) {
        return {};
      }

      // 转换返回的数据类型
      return result.map((key, value) => MapEntry(
        key.toString(),
        (value as num).toInt(),
      ));
    } on PlatformException catch (e) {
      debugPrint('获取存储信息失败: ${e.message}');
      return {};
    }
  }

  @override
  Future<Map<String, dynamic>> getPhotoExif(String filePath) async {
    try {
      final result = await methodChannel.invokeMethod<Map<dynamic, dynamic>>(
        'getExifInfo',
        {'filePath': filePath},
      );

      // 转换结果为 Map<String, dynamic>
      return _convertMap(result ?? {});
    } catch (e) {
      print('获取照片 EXIF 信息失败: $e');
      return {};
    }
  }

  /// 转换 Map 类型
  Map<String, dynamic> _convertMap(Map<dynamic, dynamic> map) {
    return map.map((key, value) {
      if (value is Map) {
        return MapEntry(key.toString(), _convertMap(value));
      }
      return MapEntry(key.toString(), value);
    });
  }

  @override
  Future<void> finishTransaction() async {
    print('Flutter: 清除自动订阅记录');
    await methodChannel.invokeMethod<Map<dynamic, dynamic>>('finishTran');
  }
}