using Microsoft.Extensions.Logging.Abstractions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using System.Text;
using System.Threading.Tasks;

namespace Plugin
{
 /// <summary> 
 /// 插件帮助类 
 /// </summary> 
 public static class PluginHelper
 {
 /// <summary> 
 /// 获取插件加载的信息 
 /// </summary> 
 /// <param name="rootPath"></param> 
 /// <returns></returns> 
 /// <exception cref="ArgumentException"></exception> 
 public static List<IPlugin> GetPlugins(string rootPath)
 {
 var plugins = new List<IPlugin>();
 Directory.CreateDirectory(Path.Combine(rootPath, "Plugins"));
 var pluginsDir = Path.Combine(rootPath, "Plugins");
 foreach (var dir in Directory.GetDirectories(pluginsDir))
 {
 var dirName = Path.GetFileName(dir);
 var pluginName = dirName + ".dll";
 var pluginDll = Path.Combine(dir, pluginName);
 if (!File.Exists(pluginDll))
 {
 continue;
 }
 var loader = new AssemblyLoader(dir);
 var types = loader.Load(pluginName);
 var instances = types.Where(t => typeof(IPlugin).IsAssignableFrom(t) && !t.IsAbstract)
 .Select(x => Activator.CreateInstance(x) as IPlugin);
 foreach (var i in instances)
 {
 if (string.IsNullOrEmpty(i.Info().Name)) i.Info().Name = pluginName;
 if (string.IsNullOrEmpty(i.Info().DisplayName)) i.Info().DisplayName = pluginName;
 i.Info().Path = dir;
 var assembly = i.GetType().Assembly;
 i.Info().AssemblyName = assembly.GetName().Name;
 i.Info().Version = assembly.GetName().Version?.ToString();
 i.Info().Assembly = assembly; 
 plugins.Add(i);
 }
 }
 return plugins;
 }
 }
}