using System.Text;
using PepLib.Codes;
using PepLib.Models;
using Xunit;

namespace PepLib.Core.Tests.IO;

public class ProgramReaderTests
{
    // ProgramReader reads fixed 200-byte ASCII records (no newlines), matching
    // the raw record format found inside real .pep loop entries.
    private const int RecordSize = 200;

    private static Stream RecordStream(params string[] lines)
    {
        var sb = new StringBuilder();
        foreach (var line in lines)
            sb.Append(line.PadRight(RecordSize));

        return new MemoryStream(Encoding.ASCII.GetBytes(sb.ToString()));
    }

    [Fact]
    public void Load_LinearMoveWithScribeMarker_SetsTypeToScribe()
    {
        using var stream = RecordStream("N50G1X1Y0:SCRIBE");

        var program = Program.Load(stream);

        var move = Assert.IsType<LinearMove>(Assert.Single(program));
        Assert.Equal(EntityType.Scribe, move.Type);
    }

    [Fact]
    public void Load_CircularMoveWithScribeMarker_SetsTypeToScribe()
    {
        using var stream = RecordStream("N50G2X1Y0I0.5J0:SCRIBE");

        var program = Program.Load(stream);

        var move = Assert.IsType<CircularMove>(Assert.Single(program));
        Assert.Equal(EntityType.Scribe, move.Type);
    }
}