/******************************************************************************
// MARECHAI: Master repository of computing history artifacts information
// ----------------------------------------------------------------------------
//
// Filename       : ComputersService.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// --[ Description ] ----------------------------------------------------------
//
//     Computers service
//
// --[ License ] --------------------------------------------------------------
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as
//     published by the Free Software Foundation, either version 3 of the
//     License, or (at your option) any later version.
//
//     This program is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2003-2020 Natalia Portillo
*******************************************************************************/

using System.Linq;
using System.Threading.Tasks;
using Marechai.Database;
using Marechai.Database.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Localization;

namespace Marechai.Services
{
    public class ComputersService
    {
        readonly MarechaiContext                    _context;
        readonly IStringLocalizer<ComputersService> _l;

        public ComputersService(MarechaiContext context, IStringLocalizer<ComputersService> localizer)
        {
            _context = context;
            _l       = localizer;
        }

        public async Task<int> GetComputersCountAsync() =>
            await _context.Machines.CountAsync(c => c.Type == MachineType.Computer);

        public Task<int> GetMinimumYearAsync() => _context.
                                                  Machines.Where(t => t.Type == MachineType.Computer &&
                                                                      t.Introduced.HasValue          &&
                                                                      t.Introduced.Value.Year > 1000).
                                                  MinAsync(t => t.Introduced.Value.Year);

        public Task<int> GetMaximumYearAsync() => _context.
                                                  Machines.Where(t => t.Type == MachineType.Computer &&
                                                                      t.Introduced.HasValue          &&
                                                                      t.Introduced.Value.Year > 1000).
                                                  MaxAsync(t => t.Introduced.Value.Year);
    }
}