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.Net.Sockets;
using System.Net;
using System.Reflection;

namespace DataLoader.CS
{
    /// <summary>
    /// 工具类
    /// </summary>
    public class Tools
    {
        /// <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();
                }

                return _dbHelper;
            }
        }

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

            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>
        /// 换算为MB
        /// </summary>
        public static double SizeToMb(long size)
        {
            if (size < 1050)
            {
                return 0.001;
            }

            string str = string.Format("{0:F3}", size / 1024.0 / 1024.0);

            return double.Parse(str);
        }

        /// <summary>
        /// 保留3位小数
        /// </summary>
        public static double Round3(double val)
        {
            string str = string.Format("{0:F3}", val);

            return double.Parse(str);
        }

        /// <summary>
        /// 获取设置
        /// </summary>
        public static string GetSetting(string key)
        {
            if (!ConfigurationManager.AppSettings.AllKeys.Contains(key)) return null;

            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>
        /// 执行命令
        /// </summary>
        /// <param name="list">命令集合</param>
        public static string ExecCmd(List<string> list)
        {
            string str = null;
            Process p = null;
            try
            {
                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;
                StreamReader se = p.StandardError;

                LogOut.Info("cmd = " + string.Join("，", list));
                si.AutoFlush = true;
                foreach (string cmd in list)
                {
                    si.WriteLine(cmd);
                }
                si.WriteLine("exit");

                str = se.ReadToEnd();
                se.Close();
                si.Close();
            }
            catch (Exception ex)
            {
                LogOut.Error(ex.Message + "\r\n" + ex.StackTrace);
                str = ex.Message;
            }
            finally
            {
                if (p != null)
                {
                    p.Close();
                    p = null;
                }
            }
            return str;
        }

        /// <summary>
        /// 删除路径
        /// </summary>
        public static string DelPath(string path)
        {
            List<string> list = new List<string>();
            list.Add(string.Format("rd \"{0}\" /s /q", path));

            return ExecCmd(list);
        }

        /// <summary>
        /// 获取本机IP
        /// </summary>
        /// <returns></returns>
        public static string GetLocalIP()
        {
            var host = Dns.GetHostEntry(Dns.GetHostName());
            foreach (var ip in host.AddressList)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                {
                    return ip.ToString();
                }
            }

            return GetSetting("localIP");
        }
    }
}