using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Serialization;

namespace ZXL.Scripts.UI
{
    public class ZMouse : MonoBehaviour
    {
        private static ZMouse instance;
        public static ZMouse Instance => instance;

        public bool isMouseDown0 = false;
        public bool isMouseUp0 = false;
        public bool isMouseDown1 = false;
        public bool isMouseUp1 = false;
        public bool isDragging0 = false;
        public GameObject downData;
        public GameObject upData;
        public Vector2 startPosition;
        public Vector2 endPosition;
        public Vector2 delta;
        public Vector2 deltaUI;

        public Action<object> MouseDown0;
        public Action<object, object> MouseUp0;
        public Action<object, object> MouseDragEnd0;

        public Action<object> MouseDown1;
        public Action<object, object> MouseUp1;
        public Action<object, object> MouseDragEnd1;

        private void Awake()
        {
            instance = this;
        }

        private void Update()
        {
            delta = Input.mousePosition;
            
            Vector2 screenpos = Input.mousePosition;
            deltaUI.x = screenpos.x - (Screen.width / 2);
            deltaUI.y = screenpos.y - (Screen.height / 2);

            if (Input.GetMouseButtonDown(0))
            {
                isMouseDown0 = true;
                isMouseUp0 = false;
                var obj = GetObj();
                downData = obj;
                MouseDown0?.Invoke(downData);
                startPosition = Input.mousePosition;
            }
            else if (Input.GetMouseButtonUp(0))
            {
                isMouseDown0 = false;
                isMouseUp0 = true;
                var obj = GetObj();
                upData = obj;
                MouseUp0?.Invoke(downData, upData);
                if (isDragging0)
                    MouseDragEnd0?.Invoke(downData, upData);

                endPosition = Input.mousePosition;
            }
            else if (Input.GetMouseButton(0))
            {
                isMouseDown0 = true;
                isMouseUp0 = false;
                if (delta != startPosition)
                {
                    isDragging0 = true;
                }
            }
            else
            {
                downData = null;
                upData = null;
                isMouseDown0 = false;
                isMouseUp0 = false;
                isDragging0 = false;
            }

            if (Input.GetMouseButtonDown(1))
            {
                isMouseDown1 = true;
                isMouseUp1 = false;
                var obj = GetObj();
                downData = obj;
                MouseDown1?.Invoke(obj);
            }
            else if (Input.GetMouseButtonUp(1))
            {
                isMouseDown1 = false;
                isMouseUp1 = true;
                var obj = GetObj();
                upData = obj;
                MouseUp1?.Invoke(downData, upData);
            }
            else if (Input.GetMouseButton(1))
            {
                isMouseDown1 = true;
                isMouseUp1 = false;
            }
            else
            {
                isMouseDown1 = false;
                isMouseUp1 = false;
            }
        }

        GameObject GetObj()
        {
            Ray2D ray = new Ray2D(Input.mousePosition, Vector2.right);
            var hit2D = Physics2D.Raycast(ray.origin, ray.direction);
            if (hit2D.collider != null)
            {
                UnityEngine.Debug.Log(hit2D.collider.gameObject.name);
                return hit2D.collider.gameObject;
            }

            return null;
        }
    }
}