using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using RomCheater.PluginFramework.Interfaces;
using RomCheater.Logging;
using System.IO;
using System.Reflection;

namespace RomCheater.PluginFramework.Core
{
    public class PluginLoader : IPluginLoader
    {
        public PluginLoader()
        {
            LoadedConfigPlugins = new List<IConfigPlugin>();
            LoadedInputPlugins = new List<IInputPlugin>();
            LoadedWindowPlugins = new List<IWindowPlugin>();
        }
        #region IPluginLoader Members

        public void LoadPlugins()
        {
            try
            {
                logger.Info.WriteLine("Loading Plugins...");

                string PluginPath = string.Format(@"{0}\Plugins", typeof(PluginLoader).Assembly.Location.Replace(@"\RomCheater.PluginFramework.dll", ""));
                logger.Debug.WriteLine("Plugins Path: {0}", PluginPath);
                List<string> dlls = new List<string>(Directory.GetFiles(PluginPath, "*.dll"));
                logger.Debug.WriteLine("  Found: {0} plugin dlls", dlls.Count);
                foreach (string dll in dlls)
                {
                    FileInfo fi = new FileInfo(dll);
                    logger.Debug.WriteLine("    plugin[{0}]: {1}", dlls.IndexOf(dll), fi.Name);
                    GetConfigPluginsFromDll(fi);
                    GetInputPluginsFromDll(fi);
                    GetWindowPluginsFromDll(fi);
                }

                logger.Info.WriteLine("  Loaded {0} config plugins", LoadedConfigPlugins.Count);
                logger.Info.WriteLine("  Loaded {0} input plugins", LoadedInputPlugins.Count);
                logger.Info.WriteLine("  Loaded {0} window plugins", LoadedWindowPlugins.Count);

                logger.Info.WriteLine("Plugins Loaded.");
            }
            catch (ReflectionTypeLoadException ex)
            {
                StringBuilder builder = new StringBuilder();
                if (ex.LoaderExceptions.Count() > 0)
                {
                    foreach (Exception c in ex.LoaderExceptions)
                    {
                        builder.AppendLine(c.ToString());
                    }
                }
                logger.Error.WriteLine("Failed to load one or more plugins{0}Possible Reason:{0}{1}", System.Environment.NewLine, builder.ToString());
            }
            catch (Exception ex)
            {
                logger.Error.WriteLine("Failed to load one or more plugins{0}Possible Reason:{0}{1}", System.Environment.NewLine, ex.ToString());
            }
        }
        public List<IConfigPlugin> LoadedConfigPlugins { get; private set; }
        public List<IInputPlugin> LoadedInputPlugins { get; private set; }
        public List<IWindowPlugin> LoadedWindowPlugins { get; private set; }

        public IConfigPlugin GetConfigPlugin(string t)
        {
            foreach (IConfigPlugin c in LoadedConfigPlugins) { if (c.ToString().ToLower() == t.ToLower()) { return c; } }
            return null;
        }
        public IInputPlugin GetInputPlugin(string t)
        {
            foreach (IInputPlugin c in LoadedInputPlugins) { if (c.ToString().ToLower() == t.ToLower()) { return c; } }
            return null;
        }
        public IWindowPlugin GetWindowPlugin(string t)
        {
            foreach (IWindowPlugin c in LoadedWindowPlugins) { if (c.ToString().ToLower() == t.ToLower()) { return c; } }
            return null;
        }

        #endregion

        private void GetConfigPluginsFromDll(FileInfo dll)
        {
            logger.Debug.WriteLine("  Getting Config plugins contained in {0}", dll.Name);
            Assembly asm = Assembly.LoadFile(dll.FullName);
            List<Type> types = new List<Type>(asm.GetTypes());
            foreach (Type type in types)
            {
                if (type.BaseType == typeof(ConfigPlugin))
                {
                    ConstructorInfo ci = null;
                    ci = type.GetConstructor(new Type[] {});
                    if (ci == null)
                    {
                        throw new NullReferenceException(string.Format("Unable to bind to constructor for type: {0}", type.Name));
                    }
                    else
                    {
                        object o = ci.Invoke(new object[] { });
                        IConfigPlugin c = (IConfigPlugin)o;
                        if (c == null)
                        {
                            throw new NullReferenceException(string.Format("Failed to cast type {0} to IConfigPlugin", type.Name));
                        }
                        else
                        {
                            logger.Debug.WriteLine("    Loaded Config Plugin [name={0}] from {1}", c.Name, dll.Name);
                            LoadedConfigPlugins.Add(c);
                        }
                    }
                }
            }
        }
        private void GetInputPluginsFromDll(FileInfo dll)
        {
            logger.Debug.WriteLine("  Getting Input plugins contained in {0}", dll.Name);
            Assembly asm = Assembly.LoadFile(dll.FullName);
            List<Type> types = new List<Type>(asm.GetTypes());
            foreach (Type type in types)
            {
                if (type.BaseType == typeof(InputPlugin))
                {
                    ConstructorInfo ci = null;
                    ci = type.GetConstructor(new Type[] { });
                    if (ci == null)
                    {
                        throw new NullReferenceException(string.Format("Unable to bind to constructor for type: {0}", type.Name));
                    }
                    else
                    {
                        object o = ci.Invoke(new object[] { });
                        IInputPlugin c = (IInputPlugin)o;
                        if (c == null)
                        {
                            throw new NullReferenceException(string.Format("Failed to cast type {0} to IConfigPlugin", type.Name));
                        }
                        else
                        {
                            logger.Debug.WriteLine("    Loaded Input Plugin [name={0}] from {1}", c.Name, dll.Name);
                            LoadedInputPlugins.Add(c);
                        }
                    }
                }
            }
        }
        private void GetWindowPluginsFromDll(FileInfo dll)
        {
            logger.Debug.WriteLine("  Getting Window plugins contained in {0}", dll.Name);
            Assembly asm = Assembly.LoadFile(dll.FullName);
            List<Type> types = new List<Type>(asm.GetTypes());
            foreach (Type type in types)
            {
                if (type.BaseType == typeof(WindowPlugin))
                {
                    ConstructorInfo ci = null;
                    ci = type.GetConstructor(new Type[] { });
                    if (ci == null)
                    {
                        throw new NullReferenceException(string.Format("Unable to bind to constructor for type: {0}", type.Name));
                    }
                    else
                    {
                        object o = ci.Invoke(new object[] { });
                        IWindowPlugin c = (IWindowPlugin)o;
                        if (c == null)
                        {
                            throw new NullReferenceException(string.Format("Failed to cast type {0} to IConfigPlugin", type.Name));
                        }
                        else
                        {
                            logger.Debug.WriteLine("    Loaded Window Plugin [name={0}] from {1}", c.Name, dll.Name);
                            LoadedWindowPlugins.Add(c);
                        }
                    }
                }
            }
        }
    }
}