dotnet-core_mail-server/MailServer/DatabaseHelper.cs

using MailServer.Exceptions;
using SMTPServer;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MailServer
{
    class DatabaseHelper
    {
        MysqlDB DBContext;
        public DatabaseHelper()
        {
            DBContext = new MysqlDB();
            DBContext.Database.EnsureCreatedAsync();
        }

        public Folders GetInboxFromAccount(int accountid) => GetStandardFolderFromAccount(accountid, StandardFolders.INBOX);

        public Folders GetStandardFolderFromAccount(int accountid, StandardFolders folder)
        {
            var res = DBContext.Folders.Where(x => x.AccountId.Equals(accountid) && x.StandardFolder.Equals(folder));
            if (res.Count() < 1) throw new NotFoundException("Folder for specified account not found", Exceptions.Type.FOLDER);
            return res.FirstOrDefault();
        }

        public Accounts GetAccount(string name, string domain) => GetAccount(name, GetDomain(domain).Id);

        public Accounts GetAccount(string name, int domain)
        {
            name = name.ToLower();
            var res = DBContext.Accounts.Where(x => x.Domain.Equals(domain) && x.Name.Equals(name));
            if (res.Count() < 1) throw new NotFoundException("no account found", Exceptions.Type.ACCOUNT);
            return res.FirstOrDefault();
        }

        public Domains GetDomain(string domain)
        {
            domain = domain.ToLower();
            var res = DBContext.Domains.Where(x => x.Domain.Equals(domain));
            if (res.Count() < 1) throw new NotFoundException("no domain found", Exceptions.Type.DOMAIN);
            return res.FirstOrDefault();
        }

        public void AddMail(Mails mail)
        {
            DBContext.Add(mail);
            DBContext.SaveChangesAsync();
        }
    }
}