YYHome/packages/cs_plugin_basic/lib/dialog/verify_code_view_model.dart

import 'dart:convert';
import 'dart:io';

import 'package:domain/repository/auth_repository.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:plugin_platform/engine/directory/directory_util.dart';
import 'package:plugin_platform/engine/toast/toast_engine.dart';
import 'package:plugin_platform/http/dio/dio_cancelable_mixin.dart';
import 'package:shared/utils/log_utils.dart';

import 'verify_code_state.dart';

class VerifyCodeViewModel extends AutoDisposeNotifier<verifyCodeState> with DioCancelableMixin {
  late final AuthRepository authRepository;

  @override
  verifyCodeState build() {
    authRepository = ref.read(authRepositoryProvider);

    final state = verifyCodeState();

    registerCancellation(callback: () {
      _clearCachedImage();
    });
    return state;
  }

  ///获取验证码
  void fetchCode() async {
    final result = await authRepository.fetchCaptchaImage(cancelToken: cancelToken);

    //Base64转为本地图片缓存
    final bytes = base64.decode(result.data?.img?.replaceFirst('data:image/png;base64,', '') ?? '');
    final tempDir = DirectoryUtil.getTempPath();
    final file = File('$tempDir/verify${DateTime.now().millisecondsSinceEpoch}.png');
    await file.writeAsBytes(bytes);
    Log.d('存入的File路径为：${file.path}');

    if (result.isSuccess) {
      state = state.copyWith(key: result.data?.key, imgFilePath: file.path);
    } else {
      ToastEngine.show(result.errorMsg ?? "UnKnow Error");
    }
  }

  // 清除缓存的verify验证图形码的缓存文件
  Future<void> _clearCachedImage() async {
    final cacheDir = await DirectoryUtil.initTempDir();
    if (cacheDir != null) {
      if (await cacheDir.exists()) {
        //遍历删除 Cache 目录下面的全部文件或文件夹
        for (final entity in cacheDir.listSync()) {
          // 如果是指定的文件直接删除
          if (entity is File && entity.path.split('/').last.startsWith("verify")) {
            await entity.delete();
          }
        }
      }
    }
  }
}

final verifyCodeProvider = NotifierProvider.autoDispose<VerifyCodeViewModel, verifyCodeState>(VerifyCodeViewModel.new);