using System;
using System.IO;
using System.Reflection;

namespace PdmSwPlugin.Common
{
    public class RemoteLoader : MarshalByRefObject
    {
        private Assembly _assembly;

        public void LoadAssembly(string assemblyFile)
        {
            _assembly = Assembly.LoadFrom(assemblyFile);
        }
        public dynamic GetInstance(string typeName)
        {
            if (_assembly == null) return null;
            var type = _assembly.GetType(typeName);
            var obj = Activator.CreateInstance(type);
            return obj;
        }
        public object ExecuteMothod(string typeName, string methodName, object[] parameters)
        {
            if (_assembly == null) return null;
            var type = _assembly.GetType(typeName);
            var obj = Activator.CreateInstance(type);
            // return obj;
            MethodInfo method = type.GetMethod(methodName);
            return method.Invoke(obj, parameters);
        }
    }

    public class PluginLoader
    {
        public AppDomain appDomain { get; set; }
        public RemoteLoader remoteLoader { get; set; }
        public PluginLoader(string pluginName)
        {
            AppDomainSetup setup = new AppDomainSetup();
            setup.ApplicationName = "plugin_" + pluginName;
            setup.ApplicationBase = "C:\\Users\\cheng\\Documents\\Workspace\\PdmSwPlugin.MaterialSelect\\bin\\Debug";// "C:\\Users\\cheng\\Documents\\Workspace\\PdmSw\\bin\\x64\\Debug";
            setup.ConfigurationFile = "C:\\Users\\cheng\\Documents\\Workspace\\PdmSw\\bin\\x64\\Debug\\PdmSwPlugin.Main.dll.config";

                //"C:\\Users\\cheng\\Documents\\Workspace\\WpfUI\\bin\\x64\\Debug\\WpfUI.exe.config";
            setup.CachePath = setup.ApplicationBase;
            //setup.ShadowCopyFiles = "true";
            //setup.ShadowCopyDirectories = setup.ApplicationBase;
            setup.PrivateBinPath = "C:\\Users\\cheng\\Documents\\Workspace\\PdmSwPlugin.MaterialSelect\\bin\\Debug"; // AppDomain.CurrentDomain.BaseDirectory;
            // setup.DynamicBase = "C:\\Work\\dll\\dll"; // AppDomain.CurrentDomain.BaseDirectory;
            appDomain = AppDomain.CreateDomain("plugin_" + pluginName, null, setup);

            AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);

            string name = Assembly.GetAssembly(typeof(RemoteLoader)).GetName().FullName;
            string className = typeof(RemoteLoader).FullName;
            object sb = appDomain.CreateInstanceAndUnwrap(name, className);
            remoteLoader = (RemoteLoader)sb;
            //appDomain.Load("C:\\Users\\cheng\\Documents\\Workspace\\PdmSwPlugin.MaterialSelect\\bin\\Debug\\PdmSwPlugin.MaterialSelect.dll");
            remoteLoader.LoadAssembly("C:\\Users\\cheng\\Documents\\Workspace\\PdmSwPlugin.MaterialSelect\\bin\\Debug\\PdmSwPlugin.MaterialSelect.dll");
        }

        public Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
        {
            try
            {
                Assembly assembly = System.Reflection.Assembly.Load(args.Name);
                if (assembly != null) return assembly;
            }
            catch
            { // ignore load error
            }

            // *** Try to load by filename - split out the filename of the full assembly name
            // *** and append the base path of the original assembly (ie. look in the same dir)
            // *** NOTE: this doesn't account for special search paths but then that never
            //           worked before either.
            string[] Parts = args.Name.Split(',');
            string File = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + "\\" + Parts[0].Trim() + ".dll";
            return System.Reflection.Assembly.LoadFrom(File);
        }
        /// <summary>
        /// 加载程序集
        /// </summary>
        /// <param name="assemblyFile"></param>
        public void LoadAssembly(string assemblyFile)
        {
            remoteLoader.LoadAssembly(assemblyFile);
        }
        /// <summary>
        /// 创建对象实例
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="typeName"></param>
        /// <returns></returns>
        public dynamic GetInstance(string typeName)
        {
            if (remoteLoader == null) return null;
            return remoteLoader.GetInstance(typeName);
        }
        /// <summary>
        /// 执行类型方法
        /// </summary>
        /// <param name="typeName"></param>
        /// <param name="methodName"></param>
        /// <returns></returns>
        public object ExecuteMothod(string typeName, string methodName, object[] parameters)
        {
           return remoteLoader.ExecuteMothod(typeName, methodName, parameters);
        }
        /// <summary>
        /// 卸载应用程序域
        /// </summary>
        public void Unload()
        {
            try
            {
                if (appDomain == null) return;
                AppDomain.Unload(appDomain);
                appDomain = null;
                remoteLoader = null;
            }
            catch (CannotUnloadAppDomainException ex)
            {
                throw ex;
            }
        }
        public Assembly[] GetAssemblies()
        {
            AppDomain a = this.appDomain;
            return a.GetAssemblies();
        }
    }
}