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

namespace ExportMap.cs
{
    public class PyLasUtils
    {
        /// <summary>
        /// 获取路径
        /// </summary>
        public static string GetPath(int id)
        {
            return Path.Combine(SGUtils.LFData, "3d\\3dtiles\\las", id.ToString());
        }

        /// <summary>
        /// 获取发布地址
        /// </summary>
        public static string GetReleaseUrl(string path)
        {
            return "{host}/LFData/" + path.Replace("\\", "/");
        }

        /// <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> list = XYZUtils.SelectMetas(args.ids, "and type in ('las', 'laz')");
                if (null == list || list.Count == 0) return null;

                string pyPath = Tools.GetSetting("pythonFolder");
                string uploadFolder = Tools.GetSetting("uploadFolder");

                List<int> ids = new List<int>();
                foreach (SysMeta meta in list)
                {
                    string lasPath = Path.Combine(uploadFolder, meta.path);
                    if (!File.Exists(lasPath)) continue;

                    string outPath = GetPath(meta.id);
                    if (Directory.Exists(outPath)) Tools.DelPath(outPath);
                    if (!Directory.Exists(outPath)) Directory.CreateDirectory(outPath);

                    //int idx = args.ids.IndexOf(meta.id); // args.srids[idx], args.zs[idx])
                    List<string> cmds = new List<string>();
                    cmds.Add(string.Format("set PYTHONHOME={0}", pyPath));
                    cmds.Add(string.Format("{0}\\Scripts\\py3dtiles.exe convert --overwrite {1} --out {2}", pyPath, lasPath, outPath));

                    SysTask task = TaskDBHelper.CreateTask(args, meta, "LAS", "点云数据(LAS)");
                    err = Tools.ExecCmd(task, cmds, false);
                    err = null;

                    string jsonFile = Path.Combine(outPath, "tileset.json");
                    if (File.Exists(jsonFile))
                    {
                        string path = jsonFile.Replace(Tools.GetSetting("lfData") + "\\", "");
                        int pubid = InsertToDB(meta, args, path);
                        if (pubid > 0) ids.Add(pubid);
                    }
                }

                return ids;
            }
            catch (Exception ex)
            {
                LogOut.Error(ex.Message + "\r\n" + ex.StackTrace);
                err = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 插入数据库
        /// </summary>
        private static int InsertToDB(SysMeta meta, XYZArgs args, string path)
        {
            //if (PubDBHelper.IsPublish(meta.id)) return 1;
            int pubid = PubDBHelper.GetPushlishId(meta.id);
            if (pubid > 0)
            {
                PubDBHelper.UpdatePublish(pubid, meta.name, args.userId, null);
                return pubid;
            }

            SysPublish sys = Tools.NewPublish(meta, args, GetReleaseUrl(path), path);
            sys.json = GetLasGeomJSON(Path.Combine(Tools.GetSetting("uploadFolder"), meta.path), meta.id);

            pubid = PubDBHelper.InsertPublish(sys);
            if (pubid > 0)
            {
                sys.id = pubid;
                PubDBHelper.InsertLayer(sys, meta);
                PubDBHelper.InsertMetaPub(meta.id, pubid, args.userId);
            }

            return pubid;
        }

        /// <summary>
        /// 坐标转换 *
        /// </summary>
        public static void CsTransform(string epsg, double x, double y, double z = 0)
        {
            List<string> cmds = new List<string>();

            string gdalPath = Tools.GetSetting("gdalPath");
            cmds.Add(string.Format("\"{0}\\gdaltransform.exe\" -s_srs EPSG:{1} -t_srs EPSG:4326", gdalPath, epsg.Replace("EPSG:", "")));
            cmds.Add(string.Format("echo {0} {1} {2}", x, y, z));

            string rs = null;
            string str = Tools.ExecCmd(cmds, ref rs);

            //return rs;
        }

        /// <summary>
        /// 获取las坐标JSON
        /// </summary>
        public static string GetLasGeomJSON(string lasFile, int id)
        {
            try
            {
                string cmd = string.Format("\"{0}\\lasinfo.exe\" \"{1}\"", Tools.GetSetting("tilerPath"), lasFile);
                string rs = Tools.ExecCmd(new List<string> { cmd });
                if (string.IsNullOrEmpty(rs)) return null;

                string[] strs = rs.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
                string epsg = GetEpsgFromStrs(strs);
                string minStr = GetCoordFromStrs(strs, "min x y z:");
                string maxStr = GetCoordFromStrs(strs, "max x y z:");
                string scaleStr = GetCoordFromStrs(strs, "scale factor x y z:");
                if (string.IsNullOrEmpty(epsg) || string.IsNullOrEmpty(minStr) || string.IsNullOrEmpty(maxStr) || string.IsNullOrEmpty(scaleStr)) return null;

                string[] minXYZ = minStr.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                string[] maxXYZ = maxStr.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                string[] scales = scaleStr.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                double minX = double.Parse(minXYZ[0]), minY = double.Parse(minXYZ[1]), minZ = double.Parse(minXYZ[2]);
                double maxX = double.Parse(maxXYZ[0]), maxY = double.Parse(maxXYZ[1]), maxZ = double.Parse(maxXYZ[2]);
                double x = (minX + maxX) / 2, y = (minY + maxY) / 2, z = maxZ, scale = Math.Round(1 / double.Parse(scales[0]), 2) / 10;

                string url = ExportUtil.LFServer + "/publish/selectCsTransform?token=" + Tools.Token + "&x=" + x + "&y=" + y + "&epsg=" + epsg;
                rs = ExportUtil.GetData(url);
                if (string.IsNullOrEmpty(rs)) return null;

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

                return string.Format("{{\"lon\":{0},\"lat\":{1},\"height\":{2},\"yaw\":0,\"alpha\":1,\"modelid\":\"DbId\",\"scale\":{3},\"lasId\":{4}}}", x, y, z, scale, id);
            }
            catch (Exception ex)
            {
                LogOut.Error(ex.StackTrace);
                return null;
            }
        }

        /// <summary>
        /// 从字符串数组中获取EPSG
        /// </summary>
        private static string GetEpsgFromStrs(string[] strs)
        {
            foreach (string str in strs)
            {
                if (str.Contains("key 3072 "))
                {
                    int start = str.IndexOf("value_offset") + 12;
                    int end = str.IndexOf("-", start);

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

            return null;
        }

        /// <summary>
        /// 从字符串数组中获取坐标
        /// </summary>
        private static string GetCoordFromStrs(string[] strs, string key)
        {
            foreach (string str in strs)
            {
                if (str.Contains(key))
                {
                    return str.Replace(key, "");
                }
            }

            return null;
        }
    }
}