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

namespace Aaru.Tests.Issues
{
    /// <summary>This class will test an issue that happens when reading an image completely, from start to end, crashes.</summary>
    public abstract class ImageReadIssueTest
    {
        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");

            IMediaImage image = ImageFormat.Detect(inputFilter);

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

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

            ulong       doneSectors = 0;
            var         ctx         = new Crc32Context();
            ErrorNumber errno;

            while(doneSectors < image.Info.Sectors)
            {
                byte[] sector;

                if(image.Info.Sectors - doneSectors >= SECTORS_TO_READ)
                {
                    errno       =  image.ReadSectors(doneSectors, SECTORS_TO_READ, out sector);
                    doneSectors += SECTORS_TO_READ;
                }
                else
                {
                    errno       =  image.ReadSectors(doneSectors, (uint)(image.Info.Sectors - doneSectors), out sector);
                    doneSectors += image.Info.Sectors - doneSectors;
                }

                Assert.AreEqual(ErrorNumber.NoError, errno);

                ctx.Update(sector);
            }
        }
    }
}