// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : SHA384.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Aaru unit testing.
//
// --[ 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 © 2011-2026 Natalia Portillo
// ****************************************************************************/

using System.IO;
using Aaru.Checksums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;
using FluentAssertions;
using NUnit.Framework;

namespace Aaru.Tests.Checksums;

[TestFixture]
public class Sha384
{
    static readonly byte[] _expectedEmpty =
    [
        0x31, 0x64, 0x67, 0x3a, 0x8a, 0xc2, 0x75, 0x76, 0xab, 0x5f, 0xc0, 0x6b, 0x9a, 0xdc, 0x4c, 0xe0, 0xac, 0xa5,
        0xbd, 0x30, 0x25, 0x38, 0x4b, 0x1c, 0xf2, 0x12, 0x8a, 0x87, 0x95, 0xe7, 0x47, 0xc4, 0x31, 0xe8, 0x82, 0x78,
        0x5a, 0x0b, 0xf8, 0xdc, 0x70, 0xb4, 0x29, 0x95, 0xdb, 0x38, 0x85, 0x75
    ];
    static readonly byte[] _expectedRandom =
    [
        0xdb, 0x53, 0x0e, 0x17, 0x9b, 0x81, 0xfe, 0x5f, 0x6d, 0x20, 0x41, 0x04, 0x6e, 0x77, 0xd9, 0x85, 0xf2, 0x85,
        0x8a, 0x66, 0xca, 0xd3, 0x8d, 0x1a, 0xd5, 0xac, 0x67, 0xa9, 0x74, 0xe1, 0xef, 0x3f, 0x4d, 0xdf, 0x94, 0x15,
        0x2e, 0xac, 0x2e, 0xfe, 0x16, 0x95, 0x81, 0x54, 0xdc, 0x59, 0xd4, 0xc3
    ];

    [Test]
    public void EmptyData()
    {
        var data = new byte[1048576];

        var fs = new FileStream(Path.Combine(Consts.TestFilesRoot, "Checksum test files", "empty"),
                                FileMode.Open,
                                FileAccess.Read);

        fs.EnsureRead(data, 0, 1048576);
        fs.Close();
        fs.Dispose();
        Sha384Context.Data(data, out byte[] result);
        result.Should().BeEquivalentTo(_expectedEmpty);
    }

    [Test]
    public void EmptyFile()
    {
        byte[] result = Sha384Context.File(Path.Combine(Consts.TestFilesRoot, "Checksum test files", "empty"));
        result.Should().BeEquivalentTo(_expectedEmpty);
    }

    [Test]
    public void EmptyInstance()
    {
        var data = new byte[1048576];

        var fs = new FileStream(Path.Combine(Consts.TestFilesRoot, "Checksum test files", "empty"),
                                FileMode.Open,
                                FileAccess.Read);

        fs.EnsureRead(data, 0, 1048576);
        fs.Close();
        fs.Dispose();
        IChecksum ctx = new Sha384Context();
        ctx.Update(data);
        byte[] result = ctx.Final();
        result.Should().BeEquivalentTo(_expectedEmpty);
    }

    [Test]
    public void RandomData()
    {
        var data = new byte[1048576];

        var fs = new FileStream(Path.Combine(Consts.TestFilesRoot, "Checksum test files", "random"),
                                FileMode.Open,
                                FileAccess.Read);

        fs.EnsureRead(data, 0, 1048576);
        fs.Close();
        fs.Dispose();
        Sha384Context.Data(data, out byte[] result);
        result.Should().BeEquivalentTo(_expectedRandom);
    }

    [Test]
    public void RandomFile()
    {
        byte[] result = Sha384Context.File(Path.Combine(Consts.TestFilesRoot, "Checksum test files", "random"));
        result.Should().BeEquivalentTo(_expectedRandom);
    }

    [Test]
    public void RandomInstance()
    {
        var data = new byte[1048576];

        var fs = new FileStream(Path.Combine(Consts.TestFilesRoot, "Checksum test files", "random"),
                                FileMode.Open,
                                FileAccess.Read);

        fs.EnsureRead(data, 0, 1048576);
        fs.Close();
        fs.Dispose();
        IChecksum ctx = new Sha384Context();
        ctx.Update(data);
        byte[] result = ctx.Final();
        result.Should().BeEquivalentTo(_expectedRandom);
    }
}