using System.Collections.Generic;
using AibisDream.Kit;
using UnityEngine;

namespace AibisDream.Framework
{
    public class EventSystemEx : Singleton<EventSystemEx>
    {
        #region 状态

        public bool isLocked;

        #endregion

        private List<GameObject> pointerOverObjList;
        private List<GameObject> draggingObjList;
        private List<GameObject> holdingObjList;

        #region 事件触发中转

        public void OnPointerEnter(IInteraction interaction)
        {
            if (!pointerOverObjList.Contains(interaction.GetGameObject()))
            {
                pointerOverObjList.Add(interaction.GetGameObject());
            }
        }

        public void OnPointerExit(IInteraction interaction)
        {
            pointerOverObjList.Remove(interaction.GetGameObject());
        }

        public void OnPointerDown(IInteraction interaction)
        {
            if (!holdingObjList.Contains(interaction.GetGameObject()))
            {
                holdingObjList.Add(interaction.GetGameObject());
            }
        }

        public void OnPointerUp(IInteraction interaction)
        {
            holdingObjList.Remove(interaction.GetGameObject());
        }

        public void OnDrag(IInteraction interaction)
        {
            if (!draggingObjList.Contains(interaction.GetGameObject()))
            {
                draggingObjList.Add(interaction.GetGameObject());
            }
        }

        public void OnEndDrag(IInteraction interaction)
        {
            draggingObjList.Remove(interaction.GetGameObject());
        }

        public void OnBeginDrag(IInteraction interaction)
        {
            if (!draggingObjList.Contains(interaction.GetGameObject()))
            {
                draggingObjList.Add(interaction.GetGameObject());
            }
        }

        public TriggerEnum GetPointerState()
        {
            if (holdingObjList.Count > 0 || draggingObjList.Count > 0)
            {
                Debug.Log($"Dragging: {draggingObjList.Count}");
                Debug.Log($"Holding: {holdingObjList.Count}");
                return TriggerEnum.Dragging;
            }
            else if (pointerOverObjList.Count > 0)
            {
                Debug.Log($"PointerOver: {pointerOverObjList.Count}");
                return TriggerEnum.PointerOver;
            }
            else
            {
                return TriggerEnum.None;
            }
        }

        #endregion

        #region 单例必须的代码

        public override void OnSingletonInit()
        {
            pointerOverObjList = new List<GameObject>();
            draggingObjList = new List<GameObject>();
            holdingObjList = new List<GameObject>();

            EnumEventSystem.Global.Register(GameLoopEnum.GameStart, ClearAll);
            EnumEventSystem.Global.Register(GameLoopEnum.GameQuit, ClearAll);
        }

        private void ClearAll()
        {
            pointerOverObjList.Clear();
            draggingObjList.Clear();
            holdingObjList.Clear();
        }

        public override void OnSingletonDestroy()
        {
            EnumEventSystem.Global.UnRegister(GameLoopEnum.GameStart, ClearAll);
            EnumEventSystem.Global.UnRegister(GameLoopEnum.GameQuit, ClearAll);
        }

        #endregion
    }

    public enum TriggerEnum
    {
        None,
        Dragging,
        PointerOver
    }
}