using UnityEngine;
using System.IO;
using UnityEditor;
using System;

//[ExecuteAlways]
public partial class MapManager : MonoBehaviour
{
    public Material gridMat;
    //public ComputeShader computeShader;
    public LineRenderer line;
    public Map map { get; private set; }

    public event Action onMapCreated;

    public CellType cellType;
    public Map GenerateMap(float width, float height, float sideWidth, float sideHeight)
    {
        ClearMapGrid();
        map = new Map(width, height, sideWidth, sideHeight);
        map.SetMapId(1000);
        //默认设置半透明0.3
        map.ChangeGridAlpha(0.4f);
        onMapCreated?.Invoke();
        return map;
    }
    public void ClearMapGrid()
    {
        if (map != null)
        {
            map.Release();
            map = null;
        }
    }

    public void HideMapGrid()
    { 
        if(map != null && map.mapGrid != null)
            map.mapGrid.gameObject.SetActive(false);
    }
    public void ShowMapGrid()
    {
        if (map != null && map.mapGrid != null)
            map.mapGrid.gameObject.SetActive(true);
    }
    public void ChangeGridAlpha(float alpha)
    {
        if (map == null)
        {
            return;
        }
        map.ChangeGridAlpha(alpha);
    }
    public void ChangeGridHeight(float height)
    {
        if (map == null)
        {
            return;
        }
        int spaceHight = (int)Math.Ceiling(height * 100); //4米为一档
        map.ChangeGridHight(spaceHight);
    }
   
    public void ShowOrHideGrid()
    {
        if (map == null)
            return;
        map.mapGrid.gameObject.SetActive(!map.mapGrid.activeInHierarchy);
    }
    
    
    /// <summary>
    /// 获取地图位置的高度
    /// </summary>
    /// <param name="pos"></param>
    /// <returns></returns>
    public int GetMapY(Vector3 pos)
    {
        int posIndex = Mathf.FloorToInt(pos.x  + Mathf.FloorToInt(pos.z) * map.horizontalNumber);
        return map.selector.GetGridData()[posIndex].barrier;
    }
}
public partial class Map
{
    public GameObject mapGrid;
    public GridSelector selector;
    public int mapId { get; private set; }
    public float width { get; private set; }
    public float height { get; private set; }

    public float sideLength { get; private set; }
    public float sideWidth { get; private set; }
    public float sideHeight { get; private set; }
    public int horizontalNumber { get { return (int)(width / sideWidth); } }
    public int verticalNumber { get { return (int)(height / sideHeight); } }

    public Map(float width, float height, float sideWidth,float sideHeight)
    {
        this.width = width;
        this.height = height;
        this.sideLength = sideLength;
       
        this.sideWidth = sideWidth;
        this.sideHeight = sideHeight;
        mapGrid = CreateMapGrid();
        selector = mapGrid.AddComponent<GridSelector>();
        selector.OnMapCreated(this);
        mapGrid.transform.parent = MapManager.Instance.transform;
        mapGrid.transform.localPosition = Vector3.zero;
        mapGrid.transform.localEulerAngles = new Vector3(-90,0,0);
        //创建地图的时候需要赋值一下当前类型
        selector.CellType = MapManager.Instance.cellType;
    }

    private GameObject CreateMapGrid()
    {
        Mesh mesh = new Mesh();
        Vector3[] vertices = new Vector3[4];
        vertices[0] = new Vector3(0f, 0f, 0f);
        vertices[1] = new Vector3(0f, 0f, height);
        vertices[2] = new Vector3(width, 0f, height);
        vertices[3] = new Vector3(width, 0f, 0f);
        mesh.vertices = vertices;

        Vector2[] uv = new Vector2[4];
        uv[0] = new Vector2(0, 0);
        uv[1] = new Vector2(0, 1);
        uv[2] = new Vector2(1, 1);
        uv[3] = new Vector2(1, 0);
        mesh.uv = uv;

        int[] triangles = new int[6] { 0, 1, 2, 0, 2, 3 };
        mesh.triangles = triangles;

        Vector3[] normals = new Vector3[4] { Vector3.up, Vector3.up, Vector3.up, Vector3.up };
        mesh.normals = normals;

        GameObject go = new GameObject("Grid");
        go.AddComponent<MeshFilter>().mesh = mesh;
        go.AddComponent<MeshRenderer>().sharedMaterial = MapManager.Instance.gridMat;
        go.AddComponent<MeshCollider>().sharedMesh = mesh;
        return go;
    }

    public void SetMapId(int mapId)
    {
        this.mapId = mapId;
    }
    public void ChangeGridAlpha(float alpha)
    {
        mapGrid.GetComponent<MeshRenderer>().material.SetFloat("_Alpha", alpha);
    }
    public void ChangeGridHight(int height)
    {
        mapGrid.transform.position = new Vector3(0, height,0);
    }
    public void Release()
    {
        GameObject.Destroy(mapGrid);
        mapGrid = null;
    }

    public static void Serialize(Map map, BinaryWriter bw)
    {
        int width = map.selector.horizontalNumber;
        int height = map.selector.verticalNumber;
        int sideLength = (int)(map.sideLength * 100);
        bw.Write(map.mapId);
        bw.Write(width);
        bw.Write(height);
        bw.Write(sideLength);
        GridSelector.RenderData[] data = map.selector.GetGridData();
        for (int i = 0, length = data.Length; i < length; i++)
        {
            bw.Write(data[i].barrier);
        }
        Debug.Log("地图保存成功");
    }
    public static Map Deserialize(BinaryReader br)
    {
        int mapId = br.ReadInt32();
        int horizontalNumber = br.ReadInt32();
        int verticalNumber = br.ReadInt32();
        //服务器那边是用的边长的100倍的int
        float sideWidth = br.ReadInt32() / 100f;
        float sideHeight = br.ReadInt32() / 100f;
        var map = MapManager.Instance.GenerateMap((int)(horizontalNumber * sideWidth), (int)(verticalNumber * sideHeight), sideWidth, sideHeight);
        map.SetMapId(mapId);
        GridSelector.RenderData[] data = map.selector.GetGridData();
        for (int i = 0; i < horizontalNumber * verticalNumber; i++) {
            data[i].barrier = br.ReadInt32();
        } 
        map.selector.RefreshPlaneRender();
        return map;
    }
}