PluginManager/Loaders/CommandsLoader.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+
+using PluginManager.Interfaces;
+
+namespace PluginManager.Loaders
+{
+    internal class CommandsLoader
+    {
+        private readonly string CMDPath;
+        private readonly string CMDExtension;
+
+
+        internal delegate void onCommandLoaded(string name, bool success, DBCommand? command = null, Exception? exception = null);
+        internal delegate void onCommandFileLoaded(string path);
+
+        /// <summary>
+        /// Event fired when a command is loaded
+        /// </summary>
+        internal onCommandLoaded? OnCommandLoaded;
+
+        /// <summary>
+        /// Event fired when the file is loaded
+        /// </summary>
+        internal onCommandFileLoaded? OnCommandFileLoaded;
+
+        /// <summary>
+        /// Command Loader contructor
+        /// </summary>
+        /// <param name="CommandPath">The path to the commands</param>
+        /// <param name="CommandExtension">The extension to search for in the <paramref name="CommandPath"/></param>
+        internal CommandsLoader(string CommandPath, string CommandExtension)
+        {
+            CMDPath = CommandPath;
+            CMDExtension = CommandExtension;
+        }
+
+        /// <summary>
+        /// The method that loads all commands
+        /// </summary>
+        /// <returns></returns>
+        internal List<DBCommand>? LoadCommands()
+        {
+            if (!Directory.Exists(CMDPath))
+            {
+                Directory.CreateDirectory(CMDPath);
+                return null;
+            }
+            string[] files = Directory.GetFiles(CMDPath, $"*{CMDExtension}", SearchOption.AllDirectories);
+
+            foreach (var file in files)
+            {
+                Assembly.LoadFile(Path.GetFullPath(file));
+                if (OnCommandFileLoaded != null)
+                    OnCommandFileLoaded.Invoke(file);
+            }
+
+            List<DBCommand> plugins = new List<DBCommand>();
+
+            try
+            {
+                Type interfaceType = typeof(DBCommand);
+                Type[] types = AppDomain.CurrentDomain.GetAssemblies()
+                                        .SelectMany(a => a.GetTypes())
+                                        .Where(p => interfaceType.IsAssignableFrom(p) && p.IsClass)
+                                        .ToArray();
+                foreach (Type type in types)
+                {
+                    try
+                    {
+                        DBCommand plugin = (DBCommand)Activator.CreateInstance(type)!;
+                        plugins.Add(plugin);
+
+                        if (OnCommandLoaded != null)
+                            OnCommandLoaded.Invoke(type.FullName!, true, plugin);
+                    }
+                    catch (Exception e)
+                    {
+                        if (OnCommandLoaded != null)
+                            OnCommandLoaded.Invoke(type.FullName!, false, null, e);
+                    }
+
+                }
+
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+                return null;
+            }
+
+            return plugins;
+
+        }
+    }
+}