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

using UnityEngine;

namespace PMaker.DependencyInjection
{
    public static class IoC
    {
        private static IoCContainer _container = new IoCContainer();

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
        static void Init()
        {
            _container = new IoCContainer();
#if UNITY_EDITOR
            var obj = new GameObject("IoCContainer");
            obj.AddComponent<IoCContainer.Mono>().container = _container;
            GameObject.DontDestroyOnLoad(obj);
#endif
        }

        #region singleton
        public static void AddSingleton<T>(T instance) where T : class
        {
            _container.AddSingleton(instance);
        }
        public static void AddSingleton(Type type, object instance)
        {
            _container.AddSingleton(type, instance);
        }

        public static void RemoveSingleton<T>() where T : class
        {
            _container.RemoveSingleton<T>();
        }

        public static void RemoveSingleton(Type type)
        {
            _container.RemoveSingleton(type);
        }

        public static T GetSingleton<T>() where T : class
        {
            return _container.GetSingleton<T>();
        }

        public static void ClearSingleton()
        {
            _container.ClearSingletons();
        }
        #endregion

        #region instance
        public static void AddInstance<T>(T instance) where T : class
        {
            _container.AddInstance(instance);
        }

        public static void RemoveInstance<T>(T instance) where T : class
        {
            _container.RemoveInstance(instance);
        }

        public static void RemoveInstance(Type type, object instance)
        {
            _container.RemoveInstance(type, instance);
        }

        public static void RemoveInstances<T>() where T : class
        {
            _container.RemoveInstances<T>();
        }

        public static void RemoveInstances(Type type)
        {
            _container.RemoveInstances(type);
        }

        public static IEnumerable<T> GetInstance<T>() where T : class
        {
            return _container.GetInstances<T>();
        }

        public static void ClearAllInstances()
        {
            _container.ClearAllInstances();
        }
        #endregion

        public static bool TryGetSingleton<T>(out T instance) where T : class
        {
            instance = _container.GetSingleton<T>();
            return instance != null;
        }
    }

    public interface ISingletonCollection
    {
        void AddSingleton<T>(T instance) where T : class;

        void AddSingleton(Type type, object instance);

        void RemoveSingleton<T>() where T : class;

        void RemoveSingleton(Type type);

        void ClearSingletons();

        T GetSingleton<T>() where T : class;
    }

    public interface IInstanceCollection
    {
        void AddInstance<T>(T instance) where T : class;

        void AddInstance(Type type, object instance);

        void RemoveInstance<T>(T instance) where T : class;

        void RemoveInstance(Type type, object instance);

        void RemoveInstances<T>() where T : class;

        void RemoveInstances(Type type);

        void ClearAllInstances();

        IEnumerable<T> GetInstances<T>() where T : class;
    }

    public partial class IoCContainer : ISingletonCollection, IInstanceCollection
    {
        private Dictionary<Type, object> _singletonMapper;
        private Dictionary<Type, HashSet<object>> _instanceMapper;
        public IoCContainer()
        {
            this._singletonMapper = new Dictionary<Type, object>();
            this._instanceMapper = new Dictionary<Type, HashSet<object>>();
        }

        #region singleton

        public void RemoveSingleton(Type type)
        {
            this._singletonMapper.Remove(type);
        }

        public void AddSingleton(Type type, object instance)
        {
            this._singletonMapper.Add(type, instance);
        }

        public void AddSingleton<T>(T instance) where T : class
        {
            this._singletonMapper.Add(typeof(T), instance);
        }

        public void RemoveSingleton<T>() where T : class
        {
            this._singletonMapper.Remove(typeof(T));
        }

        public T GetSingleton<T>() where T : class
        {
            this._singletonMapper.TryGetValue(typeof(T), out var instance);
            return instance as T;
        }

        public void ClearSingletons()
        {
            this._singletonMapper.Clear();
        }
        #endregion

        #region instance
        public void AddInstance<T>(T instance) where T : class
        {
            var type = instance.GetType();
            if (this._instanceMapper.TryGetValue(type, out var set))
            {
                set.Add(instance);
            }
            else
            {
                this._instanceMapper.Add(type, new HashSet<object>() { instance });
            }
        }

        public void AddInstance(Type type, object instance)
        {
            if (this._instanceMapper.TryGetValue(type, out var set))
            {
                set.Add(instance);
            }
            else
            {
                this._instanceMapper.Add(type, new HashSet<object>() { instance });
            }
        }

        public void RemoveInstance<T>(T instance) where T : class
        {
            this.RemoveInstance(typeof(T), instance);
        }

        public void RemoveInstance(Type type, object instance)
        {
            if (this._instanceMapper.TryGetValue(type, out var set))
            {
                set.Remove(instance);
            }
            else
            {

            }
        }

        public IEnumerable<T> GetInstances<T>() where T : class
        {
            var type = typeof(T);
            if (this._instanceMapper.TryGetValue(type, out var set))
            {
                return set.Select(_ => _ as T);
            }
            return null;
        }

        public void RemoveInstances<T>() where T : class
        {
            var type = typeof(T);
            if (this._instanceMapper.TryGetValue(type, out var set))
            {
                set.Clear();
            }
        }

        public void RemoveInstances(Type type)
        {
            if (this._instanceMapper.TryGetValue(type, out var set))
            {
                set.Clear();
            }
        }

        public void ClearAllInstances()
        {
            this._instanceMapper.Clear();
        }
        #endregion
    }

#if UNITY_EDITOR
    public partial class IoCContainer
    {
        public class Mono : BaseBehaviour
        {
            [SerializeField]
            [Sirenix.OdinInspector.ReadOnly]
            public Dictionary<Type, object> SingletonMapper { get => container._singletonMapper; set => container._singletonMapper = value; }
            [SerializeField]
            [Sirenix.OdinInspector.ReadOnly]
            public Dictionary<Type, HashSet<object>> InstanceMapper { get => container._instanceMapper; set => container._instanceMapper = value; }
            public IoCContainer container;
        }
    }
#endif
}