using GameHandler.Exceptions;
using GameModel.Contract;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace GameHandler.Extensions
{
    public static class GameServiceExtension
    {
        public static IGameHandler GetGameHandler(this GameService gameService, string gameName)
        {
            var handlers = gameService.GetGameHandler();
            if (!handlers.ContainsKey(gameName))
            {
                throw new InvaildGameNameException($"not handler found for {gameName}");
            }
            var type =  handlers[gameName];
            var res = (IGameHandler)Activator.CreateInstance(type);
            return res;
        }

        public static Dictionary<string, Type> GetGameHandler(this GameService gameService)
        {
            var res = new Dictionary<string, Type>();
            var type = typeof(IGameHandler);
            var types = AppDomain.CurrentDomain.GetAssemblies()
                .SelectMany(s => s.GetTypes())
                .Where(p => type.IsAssignableFrom(p) && (!p.IsInterface));

            foreach (var item in types)
            {                
                MethodInfo staticMethodInfo = item.GetMethod("GameName");
                string returnValue = Convert.ToString(staticMethodInfo.Invoke(null, Array.Empty<object>()));

                res.Add(returnValue, item);
            }

            return res;
        }
    }
}