using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

namespace Game.RayCast;

public class MouseInput : MonoBehaviour
{
    public RayCastType rayCastType = RayCastType._2D;

    MouseInputData mouseInputData = new MouseInputData();

//    public event MouseInputEventHandle ev;

    private void Update()
    {
        if (this.IsMouseOverUI()) return;

        switch (rayCastType)
        {
            case RayCastType._3D:
                // 3d
                Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                RaycastHit hit;
                if (Physics.Raycast(ray, out hit))
                {
                    if (hit.collider != null)
                    {
                        Debug.Log(hit.collider.name);
                    }
                }

                break;
            case RayCastType._2D:
                //2d
                var point = Camera.main.ScreenToWorldPoint(Input.mousePosition);
                var hit2D = Physics2D.Raycast(point, -Vector2.up);
                if (hit2D.collider != null)
                {
                    if (Input.GetMouseButtonDown(0))
                    {
                        UnityEngine.Debug.Log(hit2D.collider.name);
                        mouseInputData.rayCastType = this.rayCastType;
                        mouseInputData.point = hit2D.point;
                        mouseInputData.isPressDown = true;
                        mouseInputData.go = hit2D.collider.gameObject;
                        EventManager.Instance.FireNow(this, new InputObjectFinishEventArgs(mouseInputData));
                    }
                    else if (Input.GetMouseButtonDown(2))
                    {
//                        Game.bfsManager.Test(hit2D.point);
                    }
                }

                break;
            default:
                throw new ArgumentOutOfRangeException();
        }
    }

    private bool IsMouseOverUI()
    {
        PointerEventData eventData = new PointerEventData(EventSystem.current)
        {
            position = Input.mousePosition
        };

        List<RaycastResult> results = new List<RaycastResult>();
        EventSystem.current.RaycastAll(eventData, results);

        foreach (var result in results)
        {
            // 检查射线检测到的对象是否为UI元素，并且是否属于CanvasGroup
            CanvasGroup canvasGroup = result.gameObject.GetComponentInParent<CanvasGroup>();

            if (canvasGroup != null)
            {
                // 如果CanvasGroup不允许交互或不阻挡射线，我们认为鼠标不是位于UI上
                if (!canvasGroup.interactable || !canvasGroup.blocksRaycasts)
                {
                    continue;
                }
            }

            // 如果找到至少一个允许交互且阻挡射线的UI元素，返回true
            return true;
        }

        // 如果所有射线检测到的UI元素都不允许交互或不阻挡射线，返回false
        return false;
    }
}

public enum RayCastType
{
    _3D,
    _2D,
}

public class MouseInputData
{
    public RayCastType rayCastType;
    public bool isPressDown;
    public Vector3 point;
    public GameObject go;
}