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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Tango.Core;
using Tango.Core.DI;
using Tango.Explorer;
using Tango.PPC.Common.Application;
using Tango.PPC.Common.Threading;
namespace Tango.PPC.Common.Storage
{
/// <summary>
/// Represents the default <see cref="IStorageProvider"/>.
/// </summary>
/// <seealso cref="Tango.Core.ExtendedObject" />
/// <seealso cref="Tango.PPC.Common.Storage.IStorageProvider" />
public class DefaultStorageProvider : ExtendedObject, IStorageProvider
{
private Thread _scanThread;
private Dictionary<String, Action<List<ExplorerFileItem>>> _fileHandlers;
/// <summary>
/// Occurs when a new storage drive has been inserted.
/// </summary>
public event EventHandler<DriveInfo> StorageConnected;
/// <summary>
/// Occurs when a storage drive has been removed.
/// </summary>
public event EventHandler<DriveInfo> StorageDisconnected;
private bool _isConnected;
/// <summary>
/// Gets a value indicating whether a storage drive is currently inserted.
/// </summary>
public bool IsConnected
{
get { return _isConnected; }
set { _isConnected = value; RaisePropertyChangedAuto(); }
}
private DriveInfo _drive;
/// <summary>
/// Gets the inserted storage drive information.
/// </summary>
public DriveInfo Drive
{
get { return _drive; }
set { _drive = value; RaisePropertyChangedAuto(); }
}
/// <summary>
/// Initializes a new instance of the <see cref="DefaultStorageProvider"/> class.
/// </summary>
public DefaultStorageProvider(IPPCApplicationManager applicationManager)
{
_fileHandlers = new Dictionary<string, Action<List<ExplorerFileItem>>>();
var drives = DriveInfo.GetDrives().Where(x => x.DriveType == DriveType.Removable).ToList();
if (drives.Count > 0)
{
IsConnected = true;
Drive = drives.FirstOrDefault();
}
applicationManager.ApplicationReady += ApplicationManager_ApplicationReady;
}
/// <summary>
/// Handles the ApplicationReady event of the ApplicationManager.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
private void ApplicationManager_ApplicationReady(object sender, EventArgs e)
{
Initialize();
}
/// <summary>
/// Registers a method for handling a file selection.
/// </summary>
/// <param name="extension">The file extension.</param>
/// <param name="handler">The handler.</param>
/// <exception cref="System.InvalidOperationException">Cannot register multiple file handlers for the same extension.</exception>
public void RegisterFileHandler(string extension, Action<List<ExplorerFileItem>> handler)
{
if (_fileHandlers.ContainsKey(extension))
{
throw new InvalidOperationException("Cannot register multiple file handlers for the same extension.");
}
_fileHandlers.Add(extension, handler);
}
/// <summary>
/// Unregisters the file handler.
/// </summary>
/// <param name="handler">The handler.</param>
public void UnregisterFileHandler(Action<List<ExplorerFileItem>> handler)
{
var h = _fileHandlers.SingleOrDefault(x => x.Value == handler);
if (h.Key != null)
{
_fileHandlers.Remove(h.Key);
}
}
/// <summary>
/// Submits a file selection.
/// </summary>
/// <param name="fileItems">The file item.</param>
public void SubmitFileSelection(List<ExplorerFileItem> fileItems)
{
if (fileItems != null && fileItems.Count > 0)
{
String extension = Path.GetExtension(fileItems.First().Path);
if (_fileHandlers.ContainsKey(extension))
{
_fileHandlers[extension].Invoke(fileItems);
}
}
}
private void Initialize()
{
_scanThread = new Thread(ScanThreadMethod);
_scanThread.IsBackground = true;
_scanThread.Start();
}
private void ScanThreadMethod()
{
while (true)
{
var drives = DriveInfo.GetDrives().Where(x => x.DriveType == DriveType.Removable).ToList();
if (IsConnected && !drives.Exists(x => x.RootDirectory.FullName == Drive.RootDirectory.FullName))
{
StorageDisconnected?.Invoke(this, Drive);
Drive = null;
IsConnected = false;
}
if (!IsConnected && drives.Count > 0)
{
Drive = drives.FirstOrDefault();
IsConnected = true;
StorageConnected?.Invoke(this, Drive);
}
Thread.Sleep(5000);
}
}
}
}
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