using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using MindPowerSdk;
using UnityEngine;

namespace MindPowerSdk
{
    [StructLayout(LayoutKind.Sequential, Pack = 4)]
    public struct SceneObjInfo
    {
        public ushort TypeId; // 高2位是type(0: 场景物件, 1: 特效物件), 其余是ID
        public int X; // 相对坐标
        public int Y;

        public short HeightOff;
        public short YawAngle;
        public short Scale; // 保留未使用      

        public short GetTypeId()
        {
            return (short)(TypeId >> 14);
        }

        public short GetID()
        {
            return (short)(TypeId & 0x3FFF);
        }

        public override string ToString()
        {
            return $"type={GetTypeId()},id={GetID()},x={X},y={Y},height_off={HeightOff},yaw_angle={YawAngle},scale={Scale}";
        }
    }

    public class SceneObjFile
    {
        /// <summary>
        /// 文件头
        /// </summary>
        public struct Header
        {
            public string Title; // "HF Object File!" char[16]
            public int Version;
            public int FileSize;

            public int SectionCntX; // 地图的横向区域数
            public int SectionCntY; // 地图的纵向区域数

            public int SectionWidth; // 区域的宽度（单位：Tile）
            public int SectionHeight; // 区域的高度（单位：Tile）
            public int SectionObjNum; // 区域允许的最大物件数
        }

        /// <summary>
        /// 用来索引文件中对象的数据
        /// </summary>
        public struct SSectionIndex
        {
            public int ObjInfoPos;
            public int ObjNum;
        }


        public Header FileHeader { get; private set; }

        SSectionIndex[,] sectionIndex;

        public List<SceneObjInfo>[,] objInfos;

        public unsafe int Load(string obj_file)
        {
            FileStream fs = File.OpenRead(obj_file);
            BinaryReader r = new BinaryReader(fs);

            long size = r.BaseStream.Length;

            Header s = new Header();
            s.Title = Encoding.ASCII.GetString(r.ReadBytes(16));
            s.Version = r.ReadInt32();
            s.FileSize = r.ReadInt32(); // 实际是32位

            s.SectionCntX = r.ReadInt32();
            s.SectionCntY = r.ReadInt32();

            s.SectionWidth = r.ReadInt32();
            s.SectionHeight = r.ReadInt32();
            s.SectionObjNum = r.ReadInt32();

            FileHeader = s;

            Debug.Log(JsonUtility.ToJson(s));

            if (s.FileSize != size)
            {
                Debug.LogWarning($"{obj_file} 文件szie不匹配: {s.FileSize} != {size}");
                return -1;
            }

            if (s.Version != 600)
            {
                Debug.LogWarning($"{obj_file} 版本只支持600: 当前是={s.Version}");
                return -1;
            }

            // 读取索引信息
            sectionIndex = new SSectionIndex[s.SectionCntX, s.SectionCntY];
            for (int y = 0; y < s.SectionCntY; y++)
            {
                for (int x = 0; x < s.SectionCntX; x++)
                {
                    SSectionIndex data = new SSectionIndex();
                    data.ObjInfoPos = r.ReadInt32();
                    data.ObjNum = r.ReadInt32();
                    sectionIndex[x, y] = data;

                    if (data.ObjNum != 0)
                        Debug.Log(JsonUtility.ToJson(data));
                }
            }

            // 读取场景物体
            objInfos = new List<SceneObjInfo>[s.SectionCntX, s.SectionCntY];
            for (int y = 0; y < s.SectionCntY; y++)
            {
                for (int x = 0; x < s.SectionCntX; x++)
                {
                    SSectionIndex idx = sectionIndex[x, y];
                    if (idx.ObjNum == 0)
                        continue;

                    var list = objInfos[x, y] ??= new List<SceneObjInfo>();

                    r.BaseStream.Seek(idx.ObjInfoPos, SeekOrigin.Begin);

                    for (int i = 0; i < idx.ObjNum; i++)
                    {
                        byte[] tmpBytes = r.ReadBytes(sizeof(SceneObjInfo));
                        SceneObjInfo sceneObjInfo = StructReader.ReadStructFromArray<SceneObjInfo>(tmpBytes);

                        // 转成绝对坐标
                        int sectionX = x * s.SectionWidth * 100;
                        int sectionY = y * s.SectionHeight * 100;
                        sceneObjInfo.X += sectionX;
                        sceneObjInfo.Y += sectionY;

                        list.Add(sceneObjInfo);
                        Debug.Log(sceneObjInfo.ToString());
                    }
                }
            }

            return 0;
        }
    }
}