/******************************************************************************
// RomRepoMgr - ROM repository manager
// ----------------------------------------------------------------------------
//
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// --[ 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 © 2020-2024 Natalia Portillo
*******************************************************************************/

using System.IO;
using System.Threading.Tasks;
using Avalonia.Threading;
using ReactiveUI;
using RomRepoMgr.Core;
using RomRepoMgr.Database;
using RomRepoMgr.Database.Models;
using RomRepoMgr.Resources;
using RomRepoMgr.Views;

namespace RomRepoMgr.ViewModels;

public sealed class RemoveDatViewModel(RemoveDat view, long romSetId) : ViewModelBase
{
    string _statusMessage;

    public string StatusMessage
    {
        get => _statusMessage;
        set => this.RaiseAndSetIfChanged(ref _statusMessage, value);
    }

    internal void OnOpened()
    {
        _ = Task.Run(() =>
        {
            using var ctx = Context.Create(Settings.Settings.Current.DatabasePath);

            Dispatcher.UIThread.Post(() => StatusMessage = Localization.RetrievingRomSetFromDatabase);

            RomSet romSet = ctx.RomSets.Find(romSetId);

            if(romSet == null) return;

            Dispatcher.UIThread.Post(() => StatusMessage = Localization.RemovingRomSetFromDatabase);

            ctx.RomSets.Remove(romSet);

            Dispatcher.UIThread.Post(() => StatusMessage = Localization.SavingChangesToDatabase);

            ctx.SaveChanges();

            Dispatcher.UIThread.Post(() => StatusMessage = Localization.RemovingDatFileFromRepo);

            var    sha384Bytes = new byte[48];
            string sha384      = romSet.Sha384;

            for(var i = 0; i < 48; i++)
            {
                if(sha384[i * 2] >= 0x30 && sha384[i * 2] <= 0x39)
                    sha384Bytes[i] = (byte)((sha384[i * 2] - 0x30) * 0x10);
                else if(sha384[i * 2] >= 0x41 && sha384[i * 2] <= 0x46)
                    sha384Bytes[i] = (byte)((sha384[i * 2] - 0x37) * 0x10);
                else if(sha384[i * 2] >= 0x61 && sha384[i * 2] <= 0x66)
                    sha384Bytes[i] = (byte)((sha384[i * 2] - 0x57) * 0x10);

                if(sha384[i * 2 + 1] >= 0x30 && sha384[i * 2 + 1] <= 0x39)
                    sha384Bytes[i] += (byte)(sha384[i * 2 + 1] - 0x30);
                else if(sha384[i * 2 + 1] >= 0x41 && sha384[i * 2 + 1] <= 0x46)
                    sha384Bytes[i] += (byte)(sha384[i * 2 + 1] - 0x37);
                else if(sha384[i * 2 + 1] >= 0x61 && sha384[i * 2 + 1] <= 0x66)
                    sha384Bytes[i] += (byte)(sha384[i * 2 + 1] - 0x57);
            }

            string datHash32         = Base32.ToBase32String(sha384Bytes);
            string datFilesPath      = Path.Combine(Settings.Settings.Current.RepositoryPath, "datfiles");
            string compressedDatPath = Path.Combine(datFilesPath,                             datHash32 + ".lz");

            if(File.Exists(compressedDatPath)) File.Delete(compressedDatPath);

            Dispatcher.UIThread.Post(view.Close);
        });
    }
}