using Npgsql;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.Common;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices.ComTypes;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace DataLoader.Model
{
    public class Tool
    {
        public static MainWindow Owner = null;

        public static readonly string BaseDir = AppDomain.CurrentDomain.BaseDirectory;

        public static int UserId = 0;

        public static string Uname = "";

        public static string Token = "";

        public static char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

        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]);
        }

        public static string GetSetting(string key)
        {
            if (!ConfigurationManager.AppSettings.AllKeys.Contains(key))
            {
                return null;
            }

            return ConfigurationManager.AppSettings[key];
        }

        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;
        }

        /*//2a0befb05146cd30213ee4b95038aca0
        public static String getFileMd5(String filePath)
        {
            FileStream fis = null;
            try
            {
                MessageDigest md = MessageDigest.getInstance("MD5");

                fis = new FileStream(new File(filePath));
                FileChannel fChannel = fis.getChannel();
                Byte[] buffer =new Byte[1024 * 1024];

                while (fChannel.read(buffer) != -1)
                {
                    buffer.flip();
                    md.update(buffer);
                    buffer.compact();
                }
                byte[] b = md.digest();

                return byteToHexString(b);
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {
                try
                {
                    if (null != fis)
                    {
                        fis.Dispose();
                    }
                }
                catch (Exception ex)
                {
                    //
                }
            }
        }

        public static String byteToHexString(byte[] tmp)
        {
            // 每个字节用 16 进制表示的话，使用两个字符，
            char[] str = new char[16 * 2];

            int k = 0;
            for (int i = 0; i < 16; i++)
            {
                // 转换成 16 进制字符的转换
                byte byte0 = tmp[i];

                // 取字节中高 4 位的数字转换
                str[k++] = HEX_DIGITS[byte0 >> 4 & 0xf];

                // >>> 为逻辑右移，将符号位一起右移， 取字节中低 4 位的数字转换
                str[k++] = HEX_DIGITS[byte0 & 0xf];
            }

            return new String(str);
        }*/
    }
}