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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
using Tango.BL.Entities;
using Tango.Logging;
using Tango.PPC.Common.Authentication;
using Tango.PPC.Common.Modules;
using Tango.PPC.Common;
using Tango.PPC.Jobs;
using System.Windows.Data;
using Tango.Core.DI;
namespace Tango.PPC.UI.Modules
{
/// <summary>
/// Represents the default PPC <see cref="IPPCModuleLoader"></see>.
/// </summary>
/// <seealso cref="Tango.Core.ExtendedObject" />
/// <seealso cref="Tango.PPC.Common.Modules.IPPCModuleLoader" />
public class DefaultPPCModuleLoader : ExtendedObject, IPPCModuleLoader
{
private static object _syncObject = new object();
private IAuthenticationProvider _authenticationProvider;
private bool _loaded;
/// <summary>
/// Occurs when the user has logged in and user modules are loaded.
/// </summary>
public event EventHandler ModulesLoaded;
/// <summary>
/// Initializes a new instance of the <see cref="DefaultPPCModuleLoader"/> class.
/// </summary>
/// <param name="authenticationProvider">The authentication provider.</param>
public DefaultPPCModuleLoader(IAuthenticationProvider authenticationProvider)
{
_authenticationProvider = authenticationProvider;
AllModules = new ObservableCollection<IPPCModule>();
UserModules = new ObservableCollection<IPPCModule>();
BindingOperations.EnableCollectionSynchronization(UserModules, _syncObject);
_authenticationProvider.CurrentUserChanged += _authenticationProvider_CurrentUserChanged;
}
/// <summary>
/// Handles the authentication provider user changed event.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The e.</param>
private void _authenticationProvider_CurrentUserChanged(object sender, User e)
{
LoadModules();
}
private ObservableCollection<IPPCModule> _allModules;
/// <summary>
/// Gets all loaded modules.
/// </summary>
public ObservableCollection<IPPCModule> AllModules
{
get { return _allModules; }
private set { _allModules = value; RaisePropertyChangedAuto(); }
}
private ObservableCollection<IPPCModule> _userModules;
/// <summary>
/// Gets all the user permitted modules.
/// </summary>
public ObservableCollection<IPPCModule> UserModules
{
get { return _userModules; }
private set { _userModules = value; RaisePropertyChangedAuto(); }
}
/// <summary>
/// Loads all available PPC modules.
/// </summary>
public void LoadModules()
{
if (!_loaded)
{
//Preloaded
LogManager.Log(String.Format("Loading module '{0}'...", nameof(JobsModule)));
AllModules.Add(new JobsModule());
//Preloaded
AllModules.Clear();
string assemblyFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
foreach (var file in Directory.GetFiles(assemblyFolder, "*.dll").Where(x => x.Contains("Tango.PPC")))
{
try
{
Assembly moduleAssembly = null;
moduleAssembly = Assembly.LoadFrom(file);
if (moduleAssembly != null)
{
foreach (var moduleType in moduleAssembly.GetLoadableTypes().Where(x => !x.IsInterface && typeof(IPPCModule).IsAssignableFrom(x) && !x.IsAbstract))
{
if (!AllModules.ToList().Exists(x => x.GetType() == moduleType))
{
try
{
LogManager.Log(String.Format("Loading module '{0}'...", moduleType.Name));
var module = Activator.CreateInstance(moduleType) as IPPCModule;
AllModules.Add(module);
}
catch (Exception ex)
{
LogManager.Log(ex, "Could not load module " + moduleType.Name);
}
}
}
}
}
catch { }
}
_loaded = true;
}
AllModules = AllModules.OrderBy(x => x.GetType().GetCustomAttribute<PPCModuleAttribute>().Index).ToObservableCollection();
UserModules.Clear();
if (_authenticationProvider.CurrentUser != null)
{
UserModules = AllModules.Where(x => _authenticationProvider.CurrentUser.HasPermission(x.Permission)).ToObservableCollection();
}
ModulesLoaded?.Invoke(this, new EventArgs());
}
/// <summary>
/// Gets the PPC module of type T if loaded.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public T GetPPCModule<T>() where T : IPPCModule
{
return UserModules.OfType<T>().FirstOrDefault();
}
}
}
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