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>
        /// 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;

            int id = list[0].id;
            string tifFile = Path.Combine(Tool.TempDir, ExportUtil.DateStr + ".txt");
            string xyzPath = Path.Combine(SGUtils.LFData, "2d\\tiles", id.ToString());
            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");

            return File.Exists(viewFile) ? id : 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;
        }
    }
}