using System.Collections.Generic;
using System.Linq;

using RobocraftX.StateSync;
using Svelto.ECS;
using TechbloxModdingAPI.Engines;

namespace TechbloxModdingAPI.Utility
{
    /// <summary>
    /// Keeps track of custom game-modifying engines
    /// </summary>
    public static class GameEngineManager
    {
        private static Dictionary<string, IApiEngine> _gameEngines = new Dictionary<string, IApiEngine>();

		private static EnginesRoot _lastEngineRoot;

        public static void AddGameEngine(IApiEngine engine)
        {
            _gameEngines[engine.Name] = engine;
			if (_lastEngineRoot != null)
            {
				Logging.MetaDebugLog($"Registering Game IApiEngine {engine.Name}");
                _lastEngineRoot.AddEngine(engine);
				if (engine is IFactoryEngine factoryEngine)
                    factoryEngine.Factory = _lastEngineRoot.GenerateEntityFactory();
                if (engine is IFunEngine funEngine)
                    funEngine.Functions = _lastEngineRoot.GenerateEntityFunctions();
            }
        }

        public static bool ExistsGameEngine(string name)
        {
            return _gameEngines.ContainsKey(name);
        }

        public static bool ExistsGameEngine(IApiEngine engine)
        {
            return ExistsGameEngine(engine.Name);
        }

        public static IApiEngine GetGameEngine(string name)
        {
            return _gameEngines[name];
        }

        public static string[] GetGameEngineNames()
        {
            return _gameEngines.Keys.ToArray();
        }

        public static void RemoveGameEngine(string name)
        {
			if (_gameEngines[name].isRemovable)
			{
				_gameEngines.Remove(name);
			}
        }

        public static void RegisterEngines(StateSyncRegistrationHelper helper)
        {
            var enginesRoot = helper.enginesRoot;
			_lastEngineRoot = enginesRoot;
            IEntityFactory factory = enginesRoot.GenerateEntityFactory();
            IEntityFunctions functions = enginesRoot.GenerateEntityFunctions();
            foreach (var key in _gameEngines.Keys)
            {
                Logging.MetaDebugLog($"Registering Game IApiEngine {_gameEngines[key].Name}");
                if (_gameEngines[key] is IDeterministicEngine detEngine)
                    helper.AddDeterministicEngine(detEngine);
                else
                    enginesRoot.AddEngine(_gameEngines[key]);
                if (_gameEngines[key] is IFactoryEngine factEngine)
                    factEngine.Factory = factory;
                if (_gameEngines[key] is IFunEngine funEngine)
                    funEngine.Functions = functions;
            }
        }
    }
}