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

namespace ExportMap.cs
{
    public class XYZUtils
    {
        private static string pyFile;

        /// <summary>
        /// 获取Python文件
        /// </summary>
        public static string PyFile
        {
            get
            {
                if (string.IsNullOrWhiteSpace(pyFile))
                {
                    pyFile = Path.Combine(ExportUtil.SourcesPath, "xyz.py");
                }

                return pyFile;
            }
        }

        /// <summary>
        /// QGIS工程
        /// </summary>
        public static string Qgz
        {
            get
            {
                //return Path.Combine(ExportUtil.SourcesPath, "xyz.qgz");
                return "xyz.qgz";
            }
        }

        /// <summary>
        /// 获取发布地址
        /// </summary>
        public static string GetReleaseUrl(string dircode)
        {
            return "http://{host}/LFData/2d/tiles/" + dircode + "/{z}/{x}/{y}.png";
        }

        /// <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</returns>
        public static int Generate(XYZArgs args, ref string err)
        {
            List<SysMeta> list = selectMetas(args.ids, "and type in ('tif', 'tiff', 'img')");
            if (null == list || list.Count == 0) return 0;

            string tifFile = Path.Combine(Tool.TempDir, ExportUtil.DateStr + ".txt");
            string xyzPath = Path.Combine(SGUtils.LFData, "2d\\tiles", args.dircode);
            if (!Directory.Exists(xyzPath)) Directory.CreateDirectory(xyzPath);

            WriteText(tifFile, list);

            string cmd = string.Format("python \"{0}\" -qgz {1} -file \"{2}\" -out \"{3}\" -min {4} -max {5}", PyFile, Qgz, tifFile, xyzPath, args.min, args.max);

            //string pyText = File.ReadAllText(PyFile);
            //pyText = pyText
            //    .Replace(@"E:\terrait\TianJin\ExportMap\ExportMap\Sources\xyz.qgz", Qgz)
            //    .Replace(@"D:\xyz\zy.txt", tifFile)
            //    .Replace(@"D:\xyz\tiles\zy", xyzPath)
            //    .Replace("=12,", "=" + args.min + ",")
            //    .Replace("=15,", "=" + args.max + ",");

            //string newPy = tifFile.Replace(".txt", ".py").Replace("\\", "\\\\");
            //File.WriteAllText(newPy, pyText);
            //string cmd = string.Format("exec(open('{0}', 'r', encoding='utf-8').read()) & exit()", newPy);

            err = ExecCmd(cmd);

            if (File.Exists(tifFile)) File.Delete(tifFile);
            string viewFile = Path.Combine(xyzPath, "view.html");
            if (File.Exists(viewFile))
            {
                string path = "2d\\tiles" + "\\" + args.dircode;
                InsertToDB(list, args, path);
                return 1;
            }

            return 0;
        }

        /// <summary>
        /// 查询元数据
        /// </summary>
        public static List<SysMeta> selectMetas(List<int> ids, string types = "")
        {
            string sql = string.Format("select * from lf.sys_meta where id in ({0}) {1} order by id", string.Join(",", ids), types);
            DataTable dt = Tool.DBHelper.GetDataTable(sql);
            List<SysMeta> list = ModelHandler.FillModel<SysMeta>(dt);

            return list;
        }

        /// <summary>
        /// 写文本文件
        /// </summary>
        private static void WriteText(string file, List<SysMeta> list)
        {
            string uploadFolder = Tool.GetSetting("uploadFolder");

            List<string> files = new List<string>();
            foreach (SysMeta meta in list)
            {
                string filePath = Path.Combine(uploadFolder, meta.path);
                if (File.Exists(filePath)) files.Add(filePath);
            }
            string str = string.Join("\n", files);

            File.WriteAllText(file, str);
        }

        /// <summary>
        /// 执行CMD
        /// </summary>
        /// <param name="cmd">命令行</param>
        /// <returns>执行结果或出错信息</returns>
        public static String ExecCmd(string cmd)
        {
            string str = null;
            try
            {
                Process p = new Process();
                p.StartInfo.FileName = "cmd.exe";
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.CreateNoWindow = true;
                p.StartInfo.RedirectStandardInput = true;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.RedirectStandardError = true;
                p.Start();

                StreamWriter si = p.StandardInput; // 标准输入流 
                StreamReader so = p.StandardOutput; // 标准输出流 
                StreamReader se = p.StandardError; // 标准错误流

                LogOut.Info("cmd = " + cmd);
                si.AutoFlush = true;
                si.WriteLine("cd \"C:\\Program Files\\QGIS 3.16\\apps\\Python37\"");
                si.WriteLine("\"C:\\Program Files\\QGIS 3.16\\bin\\qgis_process-qgis-ltr.bat\"");
                //si.WriteLine("\"C:\\Program Files\\QGIS 3.16\\bin\\python-qgis-ltr.bat\"");
                //si.WriteLine("exit()");
                si.WriteLine(cmd);
                si.WriteLine("exit");

                string info = so.ReadToEnd();
                str = se.ReadToEnd();

                if (!string.IsNullOrEmpty(info)) LogOut.Debug(info);
                if (!string.IsNullOrEmpty(str)) LogOut.Error(str);
                if (p.HasExited == false) p.Kill();

                se.Close();
                so.Close();
                si.Close();
                p.Close();
            }
            catch (Exception ex)
            {
                LogOut.Error(ex.StackTrace);
                str = ex.Message;
            }

            return str;
        }

        /// <summary>
        /// 插入数据库
        /// </summary>
        private static void InsertToDB(List<SysMeta> metas, XYZArgs args, string path)
        {
            if (PubDBHelper.IsPublish(args.dircode)) return;

            SysPublish sys = NewPublish(metas[0], args);
            sys.path = path;

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

        /// <summary>
        /// 创建数据发布类
        /// </summary>
        private static SysPublish NewPublish(SysMeta meta, XYZArgs args)
        {
            SysPublish sp = new SysPublish();
            sp.name = args.name;
            sp.url = GetReleaseUrl(args.dircode);
            sp.type = "DOM";
            sp.status = 3;
            sp.dirid = args.dircode;
            sp.depid = args.depcode;
            sp.min = args.min;
            sp.max = args.max;
            sp.json = null;
            sp.create_user = args.userId;
            sp.geom = GetPointZ(args);
            sp.bak = null;

            return sp;
        }

        /// <summary>
        /// 获取中心点
        /// </summary>
        private static string GetPointZ(XYZArgs args)
        {
            string viewFile = Path.Combine(SGUtils.LFData, "2d\\tiles", args.dircode, "view.html");
            if (!File.Exists(viewFile)) return null;

            string str = File.ReadAllText(viewFile);
            int start = str.IndexOf(".setView([") + ".setView([".Length;
            int end = str.IndexOf(");", start);

            string coords = str.Substring(start, end - start).Replace("]", "").Replace(" ", "");
            string[] strs = coords.Split(new char[] { ',' });

            return string.Format("ST_GeomFromText('POINT Z ({0} {1} {2})')", strs[0], strs[1], strs[2]);
        }
    }
}