using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
namespace BuildSystem
{
    public class BuildSystemManager : MonoSingleton<BuildSystemManager>
    {
        [NonSerialized]
        public MouseClick mouseClick;
        public BuildTip buildTip;
        [Header("地图大小")]
        public Vector2Int mapSize;
        [Header("grid大小")]
        public int gridSize;
        [Header("起始位置")]
        public Vector3 startPos;
        [Header("是否可以放置")]
        public bool isCanPlace;
        Grid[][] gridMap;
        private PlaceObject_SO placeObject_SO;
        [NonSerialized]
        public PlaceObject placeObj;

        public Material green;
        public Material red;

        [Header("用于初始化地图")]
        public PlaceObject_SO t2up;
        public PlaceObject_SO t2down;
        public PlaceObject_SO h2;

        public PlaceObject_SO t2left;
        public PlaceObject_SO t2right;
        public PlaceObject_SO v2;

        public PlaceObject_SO[] w;

        protected override void Awake()
        {
            base.Awake();
            mouseClick = GetComponent<MouseClick>();
            CreateTerrain();

            CreatePlace(w[0], 0, 0);
            CreatePlace(h2, 1, 0);
            CreatePlace(h2, 2, 0);
            CreatePlace(t2up, 3, 0);
            CreatePlace(h2, 4, 0);
            CreatePlace(h2, 5, 0);
            CreatePlace(h2, 6, 0);
            CreatePlace(h2, 7, 0);
            CreatePlace(h2, 8, 0);
            CreatePlace(h2, 9, 0);
            CreatePlace(t2up, 10, 0);
            CreatePlace(h2, 11, 0);
            CreatePlace(h2, 12, 0);
            CreatePlace(w[3], 13, 0);

            CreatePlace(h2, 1, 7);
            CreatePlace(h2, 2, 7);
            CreatePlace(t2down, 3, 7);
            CreatePlace(h2, 4, 7);
            CreatePlace(h2, 5, 7);
            CreatePlace(h2, 6, 7);
            CreatePlace(h2, 7, 7);
            CreatePlace(h2, 8, 7);
            CreatePlace(h2, 9, 7);
            CreatePlace(t2down, 10, 7);
            CreatePlace(h2, 11, 7);
            CreatePlace(h2, 12, 7);



            CreatePlace(v2, 0, 1);
            CreatePlace(t2right, 0, 2);
            CreatePlace(v2, 0, 3);
            CreatePlace(v2, 0, 4);
            CreatePlace(t2left, 0, 5);
            CreatePlace(v2, 0, 6);
            CreatePlace(w[1], 0, 7);

            CreatePlace(v2, 13, 1);
            CreatePlace(t2left, 13, 2);
            CreatePlace(v2, 13, 3);
            CreatePlace(v2, 13, 4);
            CreatePlace(t2right, 13, 5);
            CreatePlace(v2, 13, 6);
            CreatePlace(w[2], 13, 7);

            gridMap[1][3].isPlace = true;
            gridMap[7][5].isPlace = true;
            gridMap[7][2].isPlace = true;
            gridMap[8][2].isPlace = true;
            gridMap[11][4].isPlace = true;
        }

        /// <summary>
        /// 创建地形
        /// </summary>
        void CreateTerrain() {
            //创建地图
            gridMap = new Grid[mapSize.x][];
            for (int i=0;i<mapSize.x;i++) {
                gridMap[i] = new Grid[mapSize.y];
                for (int j=0;j<mapSize.y;j++) {
                    Grid grid = new Grid(i,0,j);
                    gridMap[i][j] = grid;
                    if (i > 0) {
                        grid.BindLeftAndThis(gridMap[i - 1][j]);
                    }
                    if (j>0) {
                        grid.BindDownAndThis(gridMap[i][j - 1]);
                    }
                    CreateFlag();
                }
            }
        }

        /// <summary>
        /// 创建一个当前选择的物体,用于指示器的更换
        /// </summary>
        /// <returns></returns>
        PlaceObject CreatePlaceObject() {
            Transform trans = Instantiate(placeObject_SO.prefab, transform);
            PlaceObject obj = trans.gameObject.AddComponent<PlaceObject>();
            obj.Init(placeObject_SO.nameString,
                placeObject_SO.width, placeObject_SO.height, placeObject_SO.type,placeObject_SO.ishave);
            obj.SetPosition(GetGridPos(mouseClick.MouseInGrid()));
            return obj;
        }

        /// <summary>
        /// 创建一个物体
        /// </summary>
        /// <param name="place"></param>
        /// <param name="x"></param>
        /// <param name="y"></param>
        void CreatePlace(PlaceObject_SO place,int x,int y) {
            Transform trans = Instantiate(place.prefab, transform);
            PlaceObject obj = trans.gameObject.AddComponent<PlaceObject>();
            obj.Init(place.nameString,
                place.width, place.height, place.type, place.ishave);
            obj.SetPosition(GetGridPos(new Vector3Int(x,0,y)));

            gridMap[x][y].isPlace = true;
            gridMap[x][y].type = place.type;
            gridMap[x][y].isHaves = place.ishave;
        }


        /// <summary>
        /// 创建grid标识
        /// </summary>
        void CreateFlag() {
            
        }
        /// <summary>
        /// 改变当前的选择
        /// </summary>
        public void ChangeChoose(PlaceObject_SO placeObject_SO) {
            this.placeObject_SO = placeObject_SO;
            if (placeObj)
            {
                Destroy(placeObj.gameObject);
            }
            placeObj = CreatePlaceObject();
        }

        /// <summary>
        /// 是否可以创建
        /// </summary>
        public bool isCanCreate()
        {
            //将自身大小记录
            bool isCreateSuccess = true;
            Vector3Int start = mouseClick.MouseInGrid();

            if (start == new Vector3Int(-1, -1, -1) || gridMap[start.x][start.z].isPlace)
            {
                isCreateSuccess = false;
            }
            if (!isCreateSuccess)
            {
                buildTip.ShowTip("放置失败");
                return false;
            }

            //判断类型是否可以放置
            if (isCreateSuccess)
            {
                if (!gridMap[start.x][start.z].IsCanPlace(placeObj))
                {
                    buildTip.ShowTip("周围放置类型不对");
                    return false;
                }
            }
            return true;
        }

        /// <summary>
        /// 判断是否可以创建，用于提示
        /// </summary>
        /// <returns></returns>
        public bool isCanCreateToTip()
        {
            //将自身大小记录
            bool isCreateSuccess = true;
            Vector3Int start = mouseClick.MouseInGrid();

            if (start == new Vector3Int(-1, -1, -1) || gridMap[start.x][start.z].isPlace)
            {
                isCreateSuccess = false;
            }
            if (!isCreateSuccess)
            {
                return false;
            }

            //判断类型是否可以放置
            if (isCreateSuccess)
            {
                if (!gridMap[start.x][start.z].IsCanPlace(placeObj))
                {
                    return false;
                }
            }
            return true;
        }

        public Grid GetGrid(Vector3Int pos) {
            return gridMap[pos.x][pos.z];
        }

        public Vector3 GetGridPos(Vector3Int pos) {
            if (pos == new Vector3Int(-1, -1, -1)) {
                return Vector3Int.zero;
            }
            return gridMap[pos.x][pos.z].pos;
        }

        private void Update()
        {
            //物体跟随鼠标
            if (placeObj && isCanPlace) {
                if (mouseClick.MouseInGrid() != new Vector3Int(-1,-1,-1))
                {
                    placeObj.SetPosition(GetGridPos(mouseClick.MouseInGrid()));
                }
            }

            ////创建物体
            if (Input.GetMouseButtonDown(0) && placeObj && isCanPlace && isCanCreate())
            {
                CreatePlace(placeObject_SO, mouseClick.MouseInGrid().x, mouseClick.MouseInGrid().z);
            }

            if (placeObj) {
                Material[] materials = placeObj.GetComponent<MeshRenderer>().materials;

                if (isCanCreateToTip())
                {
                    placeObj.GetComponent<MeshRenderer>().materials = new Material[5] {
                        materials[0],
                        materials[1],
                        materials[2],
                        materials[3],
                        green
                    };
                }
                else {
                    placeObj.GetComponent<MeshRenderer>().materials = new Material[5] {
                        materials[0],
                        materials[1],
                        materials[2],
                        materials[3],
                        red
                    };
                }
            }

        }

       
    }
}