/* Most of the code here, I do not own, Just thought, I'd share with you all out there.*/

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;

using System.Diagnostics.Contracts;
using System.Diagnostics;

namespace Blizzeta5
{
    public interface IPlugin : IProvider
    {
    }

    public interface ILoader
    {
        IProvider RequestProvider(string providerType);
    }

    public interface IConsumer
    {
        void Initialize(PluginLoader loader);
        string Name { get; }
        string Author { get; }
        string Description { get; }
        string Version { get; }
    }

    public interface ICommand
    {
        string Name { get; }
        string Version { get; }
        string Help { get; }
        string Usage { get; }
        string More { get; }
        bool IsPublic { get; }
        Permissions GetPermission();
    }

    public interface IProvider
    {
        void Load(LightScriptEngine.ScriptContext Context);
    }

    public class PluginLoader : ILoader
    {
        private List<Type> _providers = new List<Type>();
        
        private string PluginSearchPath;
        
        public PluginLoader(string PluginPath)
        {
            PluginSearchPath = PluginPath;
            LoadProviders();
            LoadConsumers();
        }

        public IProvider RequestProvider(string providerType)
        {
            string pType = "BlizzetaAPI." + providerType;
            try
            {
                foreach (Type t in _providers)
                {
                    if (t.FullName == pType)
                    {
                        return ((Activator.CreateInstance(t)) as IProvider);
                    }
                }
            }
            catch (Exception mme)
            {
                Server.pc(mme.Message, ConsoleColor.Red);
                Console.ReadKey(true);
            }
            return null;
        }

        private void LoadProviders()
        {
            DirectoryInfo di = new DirectoryInfo(PluginSearchPath);
            FileInfo[] assemblies = di.GetFiles("*.dll");
            //Console.WriteLine("Loading Modules...");
            foreach (FileInfo assembly in assemblies)
            {
                Assembly a = Assembly.LoadFrom(assembly.FullName);

                Type[] tarr = a.GetTypes();

                foreach (Type type in tarr)
                {
                    Type[] interfaces = type.GetInterfaces();

                    if (interfaces.Contains(typeof(IPlugin)))
                    {
                        Server.pc("{0} is a valid command!", ConsoleColor.Green, type.FullName);
                        _providers.Add(type);
                    }
                }
            }
        }

        private void LoadConsumers()
        {
            DirectoryInfo di = new DirectoryInfo(PluginSearchPath);
            FileInfo[] assemblies = di.GetFiles("*.dll");
            //Console.WriteLine("Loading Consumers...");
            foreach (FileInfo assembly in assemblies)
            {
                Assembly a = Assembly.LoadFrom(assembly.FullName);
                try
                {

                    foreach (Type type in a.GetTypes())
                    {
                        if (type.GetInterfaces().Contains(typeof(IConsumer)))
                        {
                            IConsumer consumer = (IConsumer)Activator.CreateInstance(type);
                            Server.pc("Loaded {0} by {1} - Version {2}; \"{3}\"", ConsoleColor.Gray, consumer.Name, consumer.Author, consumer.Version, consumer.Description);
                            Console.WriteLine("Initializing {0}...", type);
                            consumer.Initialize(this);

                        }
                    }
                }
                catch (Exception ex)
                {
                    System.Diagnostics.Debug.WriteLine(ex.Message);
                }
            }
        }

        public void ReloadPlugin()
        {
            _providers = null;
            LoadProviders();
            LoadConsumers();
        }
    }
}