using ExportMap.db;
using ExportMap.Models;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;

namespace ExportMap.cs
{
    public class TerrainUtils
    {
        private static int terrainMaxLevel = 0;

        private const string EPSG4326 = "EPSG:4326";

        /// <summary>
        /// 地形最大级别
        /// </summary>
        public static int TERRAIN_MAX_LEVEL
        {
            get
            {
                if (0 == terrainMaxLevel)
                {
                    string str = Tools.GetSetting("terrainMaxLevel");
                    if (!int.TryParse(str, out terrainMaxLevel))
                    {
                        terrainMaxLevel = 14;
                    }
                }

                return terrainMaxLevel;
            }
        }

        /// <summary>
        /// 默认最大文件大小：5GB
        /// </summary>
        public static long DEFAULT_MAX_SIZE = 5L * 1024 * 1024 * 1024;

        /// <summary>
        /// 获取发布地址
        /// </summary>
        public static string GetReleaseUrl(string dircode)
        {
            return "http://{host}/LFData/3d/terrain/" + dircode;
        }

        /// <summary>
        /// 获取地形路径
        /// </summary>
        public static string GetTerrainPath(string dircode)
        {
            return Path.Combine(SGUtils.LFData, "3d\\terrain", dircode);
        }

        /// <summary>
        /// 生成
        /// </summary>
        /// <param name="args">XYZ参数</param>
        /// <param name="err">错误信息</param>
        /// <returns>数据发布ID集合</returns>
        public static List<int> Generate(XYZArgs args, ref string err)
        {
            try
            {
                List<SysMeta> metas = XYZUtils.SelectMetas(args.ids, "and type in ('tif', 'tiff', 'dem')");
                if (null == metas || metas.Count == 0) return PrintInfo("找不到元数据");

                string dirPath = GetTerrainPath(args.dircode);
                //if (Directory.Exists(dirPath)) Tools.DelPath(dirPath); // 已存在的，删除
                if (!Directory.Exists(dirPath)) Directory.CreateDirectory(dirPath);
                string subPath = Path.Combine(dirPath, "subs");
                if (!Directory.Exists(subPath)) Directory.CreateDirectory(subPath);

                int pubid = PubDBHelper.GetPushlishId(args.dircode, "DEM");
                List<int> metsIds = PubDBHelper.GetPublishMetaId(pubid);

                List<string> files = new List<string>();
                string uploadFolder = Tools.GetSetting("uploadFolder");
                foreach (SysMeta meta in metas)
                {
                    if (metsIds.Contains(meta.id))
                    {
                        PrintInfo("元数据[" + meta.id + "] 已发布。");
                        continue;
                    }
                    string sourceFile = Path.Combine(uploadFolder, meta.path);
                    if (!File.Exists(sourceFile))
                    {
                        PrintInfo("元数据[" + meta.id + "] 不存在。");
                        continue;
                    }

                    string targetFile = Path.Combine(subPath, meta.path.Split(new string[] { "\\", "//" }, StringSplitOptions.None)[1]);
                    ConvertRaster(sourceFile, targetFile);
                    if (File.Exists(targetFile))
                    {
                        files.Add(targetFile);
                        CreateTerrain(args, targetFile, ref err);
                    }
                }

                CreateLayerJson(args, files, ref err);
                string json = Path.Combine(dirPath, "layer.json");
                if (!File.Exists(json)) return PrintInfo("找不到layer.json文件");

                Complement(args);
                pubid = InsertToDB(metas, args);

                return new List<int> { pubid };
            }
            catch (Exception ex)
            {
                LogOut.Error(ex.Message + "\r\n" + ex.StackTrace);
                err = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 打印信息
        /// </summary>
        private static List<int> PrintInfo(string info)
        {
            LogOut.Info("TerrainUtils：" + info);
            return null;
        }

        /// <summary>
        /// 转换栅格文件
        /// </summary>
        private static void ConvertRaster(string sourceFile, string targetFile)
        {
            if (File.Exists(targetFile)) return;

            string epsg = Tools.GetEPSG(sourceFile);
            if (epsg == EPSG4326)
            {
                File.Copy(sourceFile, targetFile);
                return;
            }

            Reproject(sourceFile, targetFile, epsg, EPSG4326);
        }

        /// <summary>
        /// 创建高程切片
        /// </summary>
        private static void CreateTerrain(XYZArgs args, string tifFile, ref string err)
        {
            string ctbPath = Tools.GetSetting("ctbJL");
            string dirPath = GetTerrainPath(args.dircode);
            //int maxLevel =  GetTerrainMaxLevel(args, tifFile);

            string gdal_data = string.Format("set GDAL_DATA={0}\\data", ctbPath);
            // -N 顶点法线, -C 强制创建缺失根瓦片, -R 不覆盖现有文件，-f Mesh
            string createMesh = string.Format("{0}\\ctb-tile.exe -s {1} -o \"{2}\" \"{3}\"", ctbPath, TERRAIN_MAX_LEVEL, dirPath, tifFile);

            List<string> list = new List<string>() { gdal_data, createMesh };
            SysTask task = TaskDBHelper.CreateTask(args, "DEM", "高程数据(DEM)");
            err = Tools.ExecCmd(task, list);
        }

        /// <summary>
        /// 创建layer.json
        /// </summary>
        private static string CreateLayerJson(XYZArgs args, List<string> files, ref string err)
        {
            string dirPath = GetTerrainPath(args.dircode);
            string vrt = Path.Combine(dirPath, "subs", "dem.vrt");
            CreateVrt(files, vrt);
            if (!File.Exists(vrt)) return null;

            string ctbPath = Tools.GetSetting("ctbJL");
            string gdal_data = string.Format("set GDAL_DATA={0}\\data", ctbPath);
            string createLayer = string.Format("{0}\\ctb-tile.exe -l -s {1} -o \"{2}\" \"{3}\"", ctbPath, TERRAIN_MAX_LEVEL, dirPath, vrt);
            Tools.ExecCmd(new List<string>() { gdal_data, createLayer });

            return vrt;
        }

        /// <summary>
        /// 创建VRT
        /// </summary>
        private static void CreateVrt(List<string> files, string vrt)
        {
            string str = string.Join("\r\n", files);
            string filelist = vrt.Replace("dem.vrt", "list.txt");
            File.WriteAllText(filelist, str);

            string gdalPath = Tools.GetSetting("gdalPath");
            string cmd = string.Format("\"{0}\\gdalbuildvrt.exe\" -input_file_list \"{1}\" \"{2}\" -overwrite", gdalPath, filelist, vrt);
            Tools.ExecCmd(new List<string> { cmd });
        }

        /// <summary>
        /// 获取地形最大级别
        /// </summary>
        private static int GetTerrainMaxLevel(XYZArgs args, string tifFile)
        {
            FileInfo fi = new FileInfo(tifFile);
            if (fi.Length > DEFAULT_MAX_SIZE) return TERRAIN_MAX_LEVEL;

            string ctbPath = Tools.GetSetting("ctbJL");
            string dirPath = GetTerrainPath(args.dircode);
            string subPath = Path.Combine(dirPath, "subs");

            string gdal_data = string.Format("set GDAL_DATA={0}\\data", ctbPath);
            string createLayer = string.Format("{0}\\ctb-tile.exe -l -o \"{1}\" \"{2}\"", ctbPath, subPath, tifFile);

            Tools.ExecCmd(new List<string>() { gdal_data, createLayer });

            string layerJson = Path.Combine(subPath, "layer.json");
            if (!File.Exists(layerJson)) return TERRAIN_MAX_LEVEL;

            string[] lines = File.ReadAllLines(layerJson, Encoding.UTF8);

            int level = -1;
            foreach (string line in lines)
            {
                if (line.IndexOf("startX") > -1) level++;
            }
            if (File.Exists(layerJson)) File.Delete(layerJson);

            return level > TERRAIN_MAX_LEVEL ? TERRAIN_MAX_LEVEL : level;
        }

        /// <summary>
        /// 补充文件
        /// </summary>
        private static void Complement(XYZArgs args)
        {
            string dirPath = GetTerrainPath(args.dircode);
            string p_0_0 = Path.Combine(dirPath, "0", "0");
            if (!Directory.Exists(p_0_0)) Directory.CreateDirectory(p_0_0);

            string p_0_1 = Path.Combine(dirPath, "0", "1");
            if (!Directory.Exists(p_0_1)) Directory.CreateDirectory(p_0_1);

            string s_0_0_0 = Path.Combine(SGUtils.LFData, "dem", "0", "0", "0.terrain");
            string d_0_0_0 = Path.Combine(dirPath, "0", "0", "0.terrain");
            if (!File.Exists(d_0_0_0)) File.Copy(s_0_0_0, d_0_0_0, true);

            string s_0_1_0 = Path.Combine(SGUtils.LFData, "dem", "0", "1", "0.terrain");
            string d_0_1_0 = Path.Combine(dirPath, "0", "1", "0.terrain");
            if (!File.Exists(d_0_1_0)) File.Copy(s_0_1_0, d_0_1_0, true);

            string layerJson = Path.Combine(dirPath, "layer.json");
            string[] lines = File.ReadAllLines(layerJson, Encoding.UTF8);
            //lines[12] = "    [ { \"startX\": 0, \"startY\": 0, \"endX\": 1, \"endY\": 0 } ]";
            for (int i = 0, c = lines.Length; i < c; i++)
            {
                if (lines[i].IndexOf("startX") > -1)
                {
                    lines[i] = "    [ { \"startX\": 0, \"startY\": 0, \"endX\": 1, \"endY\": 0 } ]";
                    break;
                }
            }

            File.WriteAllLines(layerJson, lines, Encoding.UTF8);
        }

        /// <summary>
        /// 插入数据库
        /// </summary>
        private static int InsertToDB(List<SysMeta> metas, XYZArgs args)
        {
            //if (PubDBHelper.IsPublish(args.dircode, "DEM")) return 1;
            int pubid = PubDBHelper.GetPushlishId(args.dircode, "DEM");
            if (pubid > 0) // 更新发布
            {
                List<int> ids = PubDBHelper.GetPublishMetaId(pubid);
                foreach (SysMeta m in metas)
                {
                    if (!ids.Contains(m.id)) PubDBHelper.InsertMetaPub(m.id, pubid, args.userId);
                }
                string geom = GetPointZ(args);
                int rows = PubDBHelper.UpdatePublish(pubid, args.name, args.userId, geom);

                return pubid;
            }

            SysMeta meta = metas[0];
            meta.type = "DEM";
            meta.name = args.name;
            meta.dircode = args.dircode;

            SysPublish sys = Tools.NewPublish(meta, args, GetReleaseUrl(args.dircode), "3d\\terrain\\" + args.dircode);
            sys.geom = GetPointZ(args);

            pubid = PubDBHelper.InsertPublish(sys);
            if (pubid > 0)
            {
                sys.id = pubid;
                PubDBHelper.InsertLayer(sys, new SysMeta()
                {
                    name = args.name,
                    type = meta.type,
                    dirname = meta.dirname
                });
                foreach (SysMeta m in metas)
                {
                    PubDBHelper.InsertMetaPub(m.id, pubid, args.userId);
                }
            }

            return pubid;
        }

        /// <summary>
        /// 获取中心点
        /// </summary>
        public static string GetPointZ(XYZArgs args)
        {
            string dirPath = GetTerrainPath(args.dircode);
            string vrt = Path.Combine(dirPath, "subs", "dem.vrt");
            if (!File.Exists(vrt)) return null;

            string gdalPath = Tools.GetSetting("gdalPath");
            string cmd = string.Format("\"{0}\\gdalinfo.exe\" \"{1}\"", gdalPath, vrt);

            string rs = null;
            Tools.ExecCmd(new List<string> { cmd }, ref rs);
            string center = GetCenter(rs);
            if (string.IsNullOrEmpty(rs)) return null;

            string[] strs = center.Split(new string[] { "," }, StringSplitOptions.None);
            double x = double.Parse(strs[0]);
            double y = double.Parse(strs[1]);

            return string.Format("ST_GeomFromText('POINT Z ({0} {1} {2})')", x, y, 12);
        }

        /// <summary>
        /// 获取中心坐标
        /// </summary>
        private static string GetCenter(string rs)
        {
            if (string.IsNullOrEmpty(rs)) return null;

            string[] strs = rs.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
            foreach (string str in strs)
            {
                if (str.StartsWith("Center "))
                {
                    int start = str.IndexOf("(");
                    int end = str.IndexOf(")");

                    return str.Substring(start + 1, end - start - 1).Replace(" ", "");
                }
            }

            return null;
        }

        /// <summary>
        /// 重投影
        /// </summary>
        public static void Reproject(string sourceFile, string targetFile, string sourceSrs, string targetSrs)
        {
            string gdalPath = Tools.GetSetting("gdalPath");
            string cmd = string.Format("\"{0}\\gdalwarp.exe\" -s_srs {1} -t_srs {2} -r near -of GTiff \"{3}\" \"{4}\"", gdalPath, sourceSrs, targetSrs, sourceFile, targetFile);

            Tools.ExecCmd(new List<string> { cmd });
        }

        /// <summary>
        /// 指定投影 *
        /// </summary>
        public static void Project(string sourceFile, string targetSrs)
        {
            List<string> list = new List<string>();
            list.Add("cd \"C:\\Program Files\\QGIS 3.16\\apps\\Python37\"");
            //list.Add("set GDAL_DATA=\"C:\\Program Files\\QGIS 3.16\\share\\gdal\"");
            //list.Add("set PROJ_LIB=\"C:\\Program Files\\QGIS 3.16\\share\\proj\"");
            list.Add("\"C:\\Program Files\\QGIS 3.16\\bin\\qgis_process-qgis-ltr.bat\"");

            string cmd = string.Format("python \"C:\\Program Files\\QGIS 3.16\\apps\\Python37\\Scripts\\gdal_edit.py\" -a_srs {0} {1}", targetSrs, sourceFile);
            list.Add(cmd);

            string rs = "";
            string err = Tools.ExecCmd(new List<string> { cmd }, ref rs);
        }
    }
}