Yaroze.NET/tests/Yaroze.Tests/CDROM/CdRomDeviceTests.cs

using System.IO;
using Xunit;
using Yaroze.Core.CDROM;
using Yaroze.Core.Interrupts;

namespace Yaroze.Tests.CDROM;

public class CdRomDeviceTests
{
    [Fact]
    public void CdRomDevice_ContainsCorrectAddressRange()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        // Act & Assert
        Assert.True(cdrom.Contains(0x1F801800));
        Assert.True(cdrom.Contains(0x1F801801));
        Assert.True(cdrom.Contains(0x1F801802));
        Assert.True(cdrom.Contains(0x1F801803));
        Assert.False(cdrom.Contains(0x1F801804));
        Assert.False(cdrom.Contains(0x1F8017FF));
    }

    [Fact]
    public void CdRomDevice_ReadsStatus()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        // Act
        byte status = cdrom.Read8(0x1F801800);

        // Assert
        // Initial status should have index 0, empty FIFOs
        Assert.Equal(0, status & 0x03); // Index = 0
        Assert.Equal(0, status & 0x20); // Response FIFO empty
    }

    [Fact]
    public void CdRomDevice_WritesIndexRegister()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        // Act
        cdrom.Write8(0x1F801800, 0x01); // Set index to 1
        byte status = cdrom.Read8(0x1F801800);

        // Assert
        Assert.Equal(0x01, status & 0x03); // Index should be 1
    }

    [Fact]
    public void CdRomDevice_ExecutesGetStatCommand()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        // Act
        cdrom.Write8(0x1F801800, 0x00); // Set index to 0
        cdrom.Write8(0x1F801801, 0x01); // Execute GetStat command

        // Read response
        byte response = cdrom.Read8(0x1F801801);

        // Assert
        Assert.Equal(0x02, response); // Motor on status
    }

    [Fact]
    public void CdRomDevice_HandlesSetLocCommand()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        // Act
        cdrom.Write8(0x1F801800, 0x00); // Set index to 0

        // Send SetLoc parameters (MM, SS, FF in BCD)
        cdrom.Write8(0x1F801802, 0x00); // 00 minutes
        cdrom.Write8(0x1F801802, 0x02); // 02 seconds
        cdrom.Write8(0x1F801802, 0x00); // 00 frames

        // Execute SetLoc command
        cdrom.Write8(0x1F801801, 0x02);

        // Read response
        byte response = cdrom.Read8(0x1F801801);

        // Assert
        Assert.Equal(0x02, response); // Motor on status
    }

    [Fact]
    public void CdRomDevice_LoadsDisc()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        var binPath = CreateTempBinFile(2352 * 100);

        try
        {
            // Act
            cdrom.LoadDisc(binPath);

            // Assert - no exception should be thrown
            // Device should be ready to read sectors
            Assert.True(true);
        }
        finally
        {
            File.Delete(binPath);
        }
    }

    [Fact]
    public void CdRomDevice_ResetClearsState()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        // Set some state
        cdrom.Write8(0x1F801800, 0x02); // Set index to 2
        cdrom.Write8(0x1F801802, 0xFF); // Write parameter

        // Act
        cdrom.Reset();

        // Assert
        byte status = cdrom.Read8(0x1F801800);
        Assert.Equal(0, status & 0x03); // Index should be 0
        Assert.Equal(0, status & 0x08); // Parameter FIFO should be empty
    }

    [Fact]
    public void CdRomDevice_ReadsDmaWord()
    {
        // Arrange
        var interrupts = new InterruptController();
        var cdrom = new CdRomDevice(interrupts);

        // Act
        uint word = cdrom.ReadDmaWord();

        // Assert - Should return 0 when no data is loaded
        // (actual behavior depends on implementation)
        Assert.True(true); // Just verify no exception
    }

    private string CreateTempBinFile(int size)
    {
        var tempPath = Path.Combine(Path.GetTempPath(), $"test_{System.Guid.NewGuid()}.bin");
        var data = new byte[size];
        File.WriteAllBytes(tempPath, data);
        return tempPath;
    }
}