namespace Aaru.Tests.Issues;

using System;
using System.Collections.Generic;
using System.IO;
using Aaru.Checksums;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.CommonTypes.Structs;
using Aaru.Core;
using NUnit.Framework;

/// <summary>This class will test an issue that happens when reading an image completely, from start to end, crashes.</summary>
public abstract class OpticalImageReadIssueTest
{
    const           uint   SECTORS_TO_READ = 256;
    public abstract string DataFolder { get; }
    public abstract string TestFile   { get; }

    [Test]
    public void Test()
    {
        Environment.CurrentDirectory = DataFolder;

        bool exists = File.Exists(TestFile);
        Assert.True(exists, "Test file not found");

        var     filtersList = new FiltersList();
        IFilter inputFilter = filtersList.GetFilter(TestFile);

        Assert.IsNotNull(inputFilter, "Filter for test file is not detected");

        var image = ImageFormat.Detect(inputFilter) as IMediaImage;

        Assert.IsNotNull(image, "Image format for test file is not detected");

        Assert.AreEqual(ErrorNumber.NoError, image.Open(inputFilter), "Cannot open image for test file");

        var opticalInput = image as IOpticalMediaImage;

        Assert.IsNotNull(opticalInput, "Image format for test file is not for an optical disc");

        var ctx = new Crc32Context();

        ulong previousTrackEnd = 0;

        List<Track> inputTracks = opticalInput.Tracks;

        foreach(Track currentTrack in inputTracks)
        {
            ulong sectors     = currentTrack.EndSector - currentTrack.StartSector + 1;
            ulong doneSectors = 0;

            while(doneSectors < sectors)
            {
                byte[] sector;

                ErrorNumber errno;

                if(sectors - doneSectors >= SECTORS_TO_READ)
                {
                    errno = opticalInput.ReadSectors(doneSectors, SECTORS_TO_READ, currentTrack.Sequence, out sector);

                    doneSectors += SECTORS_TO_READ;
                }
                else
                {
                    errno = opticalInput.ReadSectors(doneSectors, (uint)(sectors - doneSectors), currentTrack.Sequence,
                                                     out sector);

                    doneSectors += sectors - doneSectors;
                }

                Assert.AreEqual(ErrorNumber.NoError, errno);

                ctx.Update(sector);
            }
        }
    }
}