using GeoVLog.Core.Parsers;
using System;
using Xunit;

namespace GeoVLog.Tests.Parsers;

public class RadarAltParserTests
{
    [Fact]
    [Trait("Category", "Core")]
    public void ParsesValidFrame()
    {
        byte[] msg = { 0x10, 0xDF, 0x03, 0x03, 0xE8, 0x00, 0x33, 0x10, 0x03 };
        var ts = new DateTime(2025, 1, 1, 0, 0, 0, DateTimeKind.Utc);

        bool ok = RadarAltParser.TryParse(msg, ts, out var parsed);

        Assert.True(ok);
        Assert.Equal(ts, parsed.TimestampUtc);
        Assert.Equal<ushort>(1000, parsed.AltitudeFt!.Value);
        Assert.Equal((byte)0x00, parsed.StatusByte!.Value);
    }

    [Fact]
    [Trait("Category", "Core")]
    public void RejectsInvalidChecksum()
    {
        byte[] msg = { 0x10, 0xDF, 0x03, 0x03, 0xE8, 0x00, 0x00, 0x10, 0x03 };
        Assert.False(RadarAltParser.TryParse(msg, DateTime.UtcNow, out _));
    }

    [Fact]
    [Trait("Category", "Core")]
    public void HandlesDleStuffing()
    {
        // altitude 0x0110 ft with LSB 0x10 stuffed
        byte[] msg = { 0x10, 0xDF, 0x03, 0x01, 0x10, 0x10, 0x00, 0x0D, 0x10, 0x03 };
        bool ok = RadarAltParser.TryParse(msg, DateTime.UtcNow, out var parsed);

        Assert.True(ok);
        Assert.Equal<ushort>(0x0110, parsed.AltitudeFt!.Value);
    }
}