using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

using HXX.Scanner.Common;

namespace HXX.Scanner.Biz
{
    /// <summary>
    /// 磁盘相关业务
    /// </summary>
    public class biz_disk
    {
        /// <summary>
        /// 获取磁盘剩余空间
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static string getDataDirLeftSpace(string path)
        {
            string result = string.Empty;

            try
            {
                if (path != null && path.Length > 2)
                {
                    var s = GetHardDiskFreeSpace(path.Substring(0, 1));

                    if (s > 10)
                    {
                        result = (int)s + "G";
                    }
                    else if (s < 1)
                    {
                        result = (int)(s * 1000) + "M";
                    }
                    else
                    {
                        result = s.ToString("0.0") + "G";
                    }
                }
            }
            catch (Exception ee)
            {
                result = "--G";
                LogManager.WriteLog(path + Environment.NewLine + ee.Message);
            }

            return result;
        }

        /// <summary>
        /// 获取磁盘剩余空间
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static double getDataDirLeftSpace_double(string path)
        {
            return GetHardDiskFreeSpace(path.Substring(0, 1));
        }

        /// <summary>  
        /// 获取指定驱动器的剩余空间总大小(单位为GB)  
        /// </summary>  
        /// <param name="str_HardDiskName">只需输入代表驱动器的字母即可 </param>  
        private static double GetHardDiskFreeSpace(string str_HardDiskName)
        {
            double freeSpace = 0;
            str_HardDiskName = str_HardDiskName + ":\\";

            foreach (var drive in DriveInfo.GetDrives())
            {
                if (drive.Name == str_HardDiskName.ToUpper())
                {
                    freeSpace = drive.TotalFreeSpace * 1.0 / (1024 * 1024 * 1024);
                    break;
                }
            }

            return freeSpace;
        }

        /// <summary>
        /// 获取当前磁盘使用状态
        /// </summary>
        /// <returns></returns>
        public static ResponseEntity check_disk_status()
        {
            ResponseEntity result = new ResponseEntity();

            try
            {
                var dir = config_manager.Get("dataDir");

                if (string.IsNullOrEmpty(dir))
                {
                    result.Status = 520;
                    result.Message = "请先设置数据存放位置";
                }
                else
                {
                    var vol = getDataDirLeftSpace_double(dir);

                    if (vol < 0.5)
                    {
                        result.Status = 509;
                        result.Message = "磁盘剩余空间较少";
                    }
                    else if (vol < 5)
                    {
                        result.Status = 510;
                        result.Message = "磁盘剩余空间较少";
                    }
                    else
                    {
                        result.Status = 200;
                        result.Message = "ok";
                    }
                }
            }
            catch (Exception ee)
            {
                LogManager.WriteLog(ee);

                result.Status = 509;
                result.Message = ee.Message;
            }

            return result;
        }
    }
}