using ExportMap.db;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.Common;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security.AccessControl;
using System.Security.Principal;
using System.Web;

namespace ExportMap.cs
{
    public class Tool
    {
        /// <summary>
        /// 基础目录
        /// </summary>
        public static readonly string BaseDir = AppDomain.CurrentDomain.BaseDirectory;

        private static PostgreHelper _dbHelper;

        /// <summary>
        /// DB帮助类
        /// </summary>
        public static PostgreHelper DBHelper
        {
            get
            {
                if (null == _dbHelper)
                {
                    _dbHelper = new PostgreHelper(DbEnum.langfang);
                }

                return _dbHelper;
            }
        }

        /// <summary>
        /// 字节格式化
        /// </summary>
        public static string FormatBytes(long bytes)
        {
            string[] Suffix = { "Byte", "KB", "MB", "GB", "TB" };

            int i = 0;
            double dblSByte = bytes;
            if (bytes > 1024)
                for (i = 0; (bytes / 1024) > 0; i++, bytes /= 1024)
                    dblSByte = bytes / 1024.0;

            return String.Format("{0:0.##}{1}", dblSByte, Suffix[i]);
        }

        /// <summary>
        /// 获取设置
        /// </summary>
        public static string GetSetting(string key)
        {
            return ConfigurationManager.AppSettings[key];
        }

        /// <summary>
        /// 获取Db参数
        /// </summary>
        public static List<DbParameter> GetParams<T>(string sql, T t)
        {
            List<DbParameter> list = new List<DbParameter>();
            Type tType = typeof(T);
            BindingFlags flags = BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance;

            int start = sql.IndexOf("@");
            while (start != -1)
            {
                int end = sql.IndexOf(",", start);
                if (end == -1) end = sql.IndexOf(")", start);
                if (end == -1) end = sql.IndexOf(" ", start);
                if (end == -1) end = sql.Length;

                string name = sql.Substring(start + 1, end - start - 1);
                PropertyInfo pi = tType.GetProperty(name, flags);
                if (pi != null)
                {
                    object value = pi.GetValue(t, null);
                    DbParameter dp = new NpgsqlParameter("@" + name, value);
                    list.Add(dp);
                }

                start = sql.IndexOf("@", end);
            }

            return list;
        }

        /// <summary>
        /// 创建目录
        /// </summary>
        public static void CreateDirectory(string dir)
        {
            WindowsIdentity wi = WindowsIdentity.GetCurrent();

            FileSystemAccessRule rule = new FileSystemAccessRule(wi.User, FileSystemRights.FullControl, AccessControlType.Allow);
            DirectorySecurity ds = new DirectorySecurity();
            ds.AddAccessRule(rule);

            Directory.CreateDirectory(dir, ds);
        }

        /// <summary>
        /// 克隆对象
        /// </summary>
        public static T Clone<T>(T source) where T : new()
        {
            if (!typeof(T).IsSerializable)
            {
                throw new ArgumentException("The type must be serializable.", "source");
            }

            // Don't serialize a null object, simply return the default for that object
            if (Object.ReferenceEquals(source, null))
            {
                return default(T);
            }

            using (Stream stream = new MemoryStream())
            {
                IFormatter formatter = new BinaryFormatter();
                formatter.Serialize(stream, source);
                stream.Seek(0, SeekOrigin.Begin);

                return (T)formatter.Deserialize(stream);
            }
        }

        /// <summary>
        /// 执行Python
        /// </summary>
        /// <param name="cmd">命令行</param>
        /// <returns>执行结果或出错信息</returns>
        public static String ExecPython(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("\"C:\\Program Files\\QGIS 3.16\\bin\\python-qgis-ltr.bat\"");
                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;
        }
    }
}