using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Syntriax.Modules.Factory;
using UnityEngine;

namespace Syntriax.Modules.Movement.Config
{
    public class MovementFactory : FactoryBase
    {
        private const int InitialCapacity = 64;

        private Dictionary<string, Type> _types = null;
        public Dictionary<string, Type> Types
        {
            get
            {
                if (_types == null)
                    Initialize();

                return _types;
            }
        }

        private Func<Type, bool> predicate = type => !type.IsAbstract && type.IsSubclassOf(typeof(MonoBehaviour));

        private void Start()
        {
            if (FactorySingleton<MovementFactory>.Instance == this)
                return;

            Destroy(this);
        }

        public override void Initialize()
        {
            if (_types == null)
                _types = new Dictionary<string, Type>(InitialCapacity);

            Reset();

            foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
                AddAssemblyToFactory(assembly);
        }

        public override void Reset() => _types?.Clear();

        public void AddAssemblyToFactory(Assembly assembly)
        {
            foreach (Type type in assembly.GetTypes().Where(predicate))
                Types.Add(type.FullName, type);
        }

        public Component AddToGameObject(GameObject gameObject, string name)
        {
            if (!Types.ContainsKey(name))
                throw new ArgumentException($"The key \"{name}\" does not exists in the current {nameof(MovementFactory)}");

            return gameObject.AddComponent(Types[name]);
        }
    }
}