using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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using System.Net;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Input;
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using System.Security.Cryptography;
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namespace MauiApp1.Utils
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{
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public enum DownloadState
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{
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cancelled = 0, // 取消
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inprogres = 1, //进行中
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completed = 2, //完成
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error = 3, //错误
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existed = 4,//已存在
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noexisted = 5,//已存在
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}
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public delegate void DelegateDone(int progress, DownloadState downloadState,string filename, string msg = "");
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internal class DownloadHelper : INotifyPropertyChanged
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{
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private DelegateDone _callback;
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private bool _isDownloading = false;
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private int _progress;
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private string _fileName;
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private object _lockobj = new object();
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private WebClient _webClient;
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private ICommand DownloadCommand { get; set; }
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public bool IsDownloading
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{
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get => _isDownloading;
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set
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{
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if (value != _isDownloading)
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{
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_isDownloading = value;
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NotifyPropertyChanged("IsDownloading");
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}
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}
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}
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public string FileName
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{
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get => _fileName;
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set
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{
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if (value != _fileName)
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{
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_fileName = value;
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NotifyPropertyChanged("FileName");
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}
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}
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}
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public event PropertyChangedEventHandler? PropertyChanged;
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protected void NotifyPropertyChanged(string property)
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{
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if (PropertyChanged != null)
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{
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PropertyChanged(this, new PropertyChangedEventArgs(property));
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}
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}
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public DownloadHelper()
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{
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}
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public DownloadHelper(DelegateDone callback)
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{
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_callback = callback;
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}
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public void DownloadCreate(string downloadUrl, string fileName, string rootFolderName, string subFolderName)
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{
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lock (_lockobj)
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{
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//IsDownloading = true;
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FileName = fileName;
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var downloadFolder = Path.Combine(SysConf.ApplicationBase, rootFolderName);
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var modelFolder = Path.Combine(downloadFolder, subFolderName);
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Directory.CreateDirectory(downloadFolder);
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Directory.CreateDirectory(modelFolder);
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string fileFullname = Path.Combine(modelFolder, fileName);
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if (!File.Exists(fileFullname))
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{
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_webClient = new WebClient();
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_webClient.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36");
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_webClient.DownloadFileCompleted += OnDownloadCompleted;
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_webClient.DownloadProgressChanged += OnDownloadProgressChanged;
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DownloadCommand = new Command(() =>
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{
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if (!IsDownloading)
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{
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IsDownloading = true;
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_webClient.DownloadFileAsync(new Uri(downloadUrl), fileFullname);
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}
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});
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}
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else
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{
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DownloadCommand = null;
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if (_callback != null)
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{
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_callback(100, DownloadState.existed, FileName);
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}
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}
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}
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}
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public void DownloadStart()
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{
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if (DownloadCommand != null && DownloadCommand.CanExecute(null))
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{
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DownloadCommand.Execute(null);
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}
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}
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public void DownloadCancel()
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{
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if (_webClient != null)
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{
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_webClient.CancelAsync();
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}
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}
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public bool GetDownloadState(string[] fileNames, string rootFolderName, string subFolderName, string[] md5Strs)
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{
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bool state=true;
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var downloadFolder = Path.Combine(SysConf.ApplicationBase, rootFolderName);
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var modelFolder = Path.Combine(downloadFolder, subFolderName);
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Directory.CreateDirectory(downloadFolder);
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Directory.CreateDirectory(modelFolder);
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for (int i = 0; i < fileNames.Length; i++)
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{
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string fileFullname = Path.Combine(modelFolder, fileNames[i]);
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if (File.Exists(fileFullname))
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{
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FileInfo fileInfo = new FileInfo(fileFullname);
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if (fileInfo.Length == 0)
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{
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state = state && false;
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}
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else
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{
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string md5str = GetMD5Hash(fileFullname);
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if (!md5str.Equals(md5Strs[i]))
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{
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state = state && false;
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}
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}
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}
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else
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{
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state = state && false;
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}
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}
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return state;
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}
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public void DownloadCheck(string fileName, string rootFolderName, string subFolderName,string md5Str)
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{
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var downloadFolder = Path.Combine(SysConf.ApplicationBase, rootFolderName);
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var modelFolder = Path.Combine(downloadFolder, subFolderName);
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Directory.CreateDirectory(downloadFolder);
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Directory.CreateDirectory(modelFolder);
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string fileFullname = Path.Combine(modelFolder, fileName);
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if (File.Exists(fileFullname))
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{
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FileInfo fileInfo = new FileInfo(fileFullname);
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if (fileInfo.Length == 0)
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{
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File.Delete(fileFullname);
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string filename = fileInfo.Name;
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_callback(0, DownloadState.noexisted, filename);
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}
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else
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{
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string md5str = GetMD5Hash(fileFullname);
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if (!md5str.Equals(md5Str))
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{
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File.Delete(fileFullname);
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string filename = fileInfo.Name;
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_callback(0, DownloadState.noexisted, filename);
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}
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}
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}
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else
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{
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string filename = fileName;
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_callback(0, DownloadState.noexisted, filename);
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}
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}
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private void OnDownloadProgressChanged(object? sender, DownloadProgressChangedEventArgs e)
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{
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string filename = FileName;
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_progress = (int)(e.BytesReceived * 100 / e.TotalBytesToReceive);
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if (_callback != null)
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{
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_callback(_progress, DownloadState.inprogres, filename);
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}
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}
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private void OnDownloadCompleted(object? sender, AsyncCompletedEventArgs e)
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{
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string filename = FileName;
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IsDownloading = false;
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if (_callback != null)
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{
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if (e.Cancelled)
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{
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_callback(_progress, DownloadState.cancelled, filename);
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}
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else if (e.Error != null)
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{
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_callback(_progress, DownloadState.error,filename, msg: e.Error.Message);
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}
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else
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{
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_callback(_progress, DownloadState.completed, filename);
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}
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}
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}
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public string GetMD5Hash(string path)
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{
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using (FileStream fs = new FileStream(path, FileMode.Open))
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{
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StringBuilder sb = new StringBuilder();
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MD5 md5 = MD5.Create();
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byte[] array = md5.ComputeHash(fs);
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fs.Close();
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for (int i = 0; i < array.Length; i++)
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{
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sb.Append(array[i].ToString("x2"));
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}
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return sb.ToString();
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}
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}
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}
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}
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