using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.Windows.Forms;

namespace SafeMobileLib
{
    public class DBbackup
    {
        private string dbServer, dbPort,dbUser, dbDbname;
        public DBbackup(string dbUser, string dbName,string dbServ)
        {
            this.dbUser = dbUser; this.dbDbname = dbName; this.dbServer = dbServ;
        }

        public bool performBackupPostgres(string path, string postgresPath)
        {
            try
            {
                if (path == "")
                {
                    path = "backups";
                }
                DateTime backupTime = DateTime.Now;
                string bTime = backupTime.ToString("yyyy_MM_dd_HH_mm");

                String tmestr = "";
                if (!Directory.Exists("backups"))
                    Directory.CreateDirectory("backups");
                tmestr = path + "\\" +bTime+ ".tar";
                Console.WriteLine("Backup db to:" + tmestr);
                ProcessStartInfo proc = new ProcessStartInfo();
                string cmd = string.Format("--username={0} --file=\"{1}\" --format=c --create --host={2} {3} ",
                        dbUser, tmestr,dbServer, dbDbname);
                Console.WriteLine("backup command:" + cmd);
                try
                {
                    postgresPath += "pgsql\\bin\\";
                    proc.FileName = postgresPath + "pg_dump.exe";
                    proc.RedirectStandardInput = false;
                    proc.RedirectStandardOutput = false;
                    proc.Arguments = cmd;
                    proc.UseShellExecute = false;
                    
                    Process p = Process.Start(proc);
                    p.WaitForExit();
                }
                catch (Exception e)
                {
                    Console.WriteLine("Error: " + e.ToString());
                    return false;
                }
                return true;
            }
            catch (IOException ex)
            {
                SM.Debug("Disk full or other IO error , unable to backup!" + ex.ToString());
                return false;
            }
        }

        public bool performRestorePostgres(string filepath, string postgresPath)
        {
            try
            {
                Console.WriteLine("restore db from:" + filepath);
                ProcessStartInfo proc = new ProcessStartInfo();
                string cmd = string.Format("-c --dbname={0} --username={1} --host={2} \"{3}\"",
                        dbDbname, dbUser,dbServer, filepath);
                Console.WriteLine("restore command:"+cmd);
                try
                {
                    postgresPath += "pgsql\\bin\\";
                    proc.FileName = postgresPath + "pg_restore.exe";
                    proc.RedirectStandardInput = false;
                    proc.RedirectStandardOutput = false;
                    proc.Arguments = cmd;
                    proc.UseShellExecute = false;
                    
                    Process p = Process.Start(proc);
                    
                    p.WaitForExit();
                }
                catch (Exception e)
                {
                    Console.WriteLine("Error: " + e.ToString());
                    return false;
                }
                return true;
            }
            catch (IOException)
            {
                return false;
            }
        }

    }
}