import 'dart:io';

import 'package:appframe/services/dispatcher.dart';
import 'package:dio/dio.dart';
import 'package:path/path.dart' as path;
import 'package:path_provider/path_provider.dart';

class DownloadFileHandler extends MessageHandler {
  @override
  Future<dynamic> handleMessage(params) async {
    if (params is! Map<String, dynamic>) {
      throw Exception('参数错误');
    }

    final url = params['url'] as String;

    // 获取后缀名
    String ext = path.extension(url);
    // 获取应用文档目录路径
    final Directory tempDir = await getApplicationDocumentsDirectory();

    final targetPath = path.join(tempDir.path, '${DateTime.now().millisecondsSinceEpoch}$ext');
    final resp = await Dio().download(url, targetPath);
    if (resp.statusCode != 200) {
      throw Exception('文件下载失败');
    }

    return {'tempFilePath': '/temp$targetPath'};
  }
}