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

namespace BuildSystem {
    public class MouseClick : MonoBehaviour
    {
        
        public Transform ground;
        public Camera camera;
        RaycastHit raycastHit;

        /// <summary>
        /// 返回鼠标在地图上的坐标
        /// </summary>
        /// <returns></returns>
        public Vector3Int MouseInGrid() {
            Vector3 groundPos = camera.WorldToScreenPoint(ground.transform.position);
            Vector3 mousePos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, groundPos.z);
            Vector3 worldMousePos = camera.ScreenToWorldPoint(mousePos);
            Ray ray = new Ray(camera.transform.position, worldMousePos - camera.transform.position);
            //Debug.DrawRay(camera.transform.position, worldMousePos - camera.transform.position,Color.blue);
            int layerMask = (1 << 8) | (1 << 10);
            layerMask = ~layerMask; //取消obj层防止遮挡
            if (Physics.Raycast(ray, out raycastHit,1000f ,layerMask))
            {
                if (raycastHit.collider.tag == "Map")
                {
                    //Debug.Log(WorldInGrid(raycastHit.point));
                    return WorldInGrid(raycastHit.point);
                }
            }
            return new Vector3Int(-1,-1,-1);
        }

        /// <summary>
        /// 给定一个世界坐标，判断坐标位于哪个grid
        /// </summary>
        /// <param name="pos"></param>
        /// <returns></returns>
        Vector3Int WorldInGrid(Vector3 pos)
        {
            Vector3 gridSpace = pos - BuildSystemManager.Instance.startPos;
            int x = (int)(gridSpace.x / BuildSystemManager.Instance.gridSize);
            int z = (int)(gridSpace.z / BuildSystemManager.Instance.gridSize);
            return new Vector3Int(x,0,z);
        }
    }
}