using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using SharpDlt.Payloads;
using Shouldly;
using Xunit;

namespace SharpDlt.Tests;

/// <summary>Parses a real world DLT file recorded by a target.</summary>
public class DltFileTests
{
    private static string DataPath(string fileName) => Path.Combine(AppContext.BaseDirectory, "Data", fileName);

    [Fact]
    public void ReadMessages_Issue24File_ReducesTruncatedNumericArgument()
    {
        // The last numeric argument of the payload does not have enough bytes for its
        // declared type, so it is reduced to the next smaller type, like DLT Viewer does.
        var messages = DltReader.ReadMessages(DataPath("issue24.dlt")).ToList();

        var message = messages.ShouldHaveSingleItem();
        message.IsVerbose.ShouldBeTrue();
        var arguments = message.VerbosePayload.ShouldNotBeNull().Arguments;
        arguments.Count.ShouldBe(2);
        arguments[0].ShouldBe(new DltStringArgument("HIST: SCU_RSTSTAT:", DltStringCoding.Ascii));
        arguments[1].ShouldBe(new DltUnsignedArgument(65536, DltIntegerWidth.Bits32));
    }

    [Fact]
    public async Task ReadMessagesAsync_Issue24File_YieldsTheSameMessages()
    {
        var sync = DltReader.ReadMessages(DataPath("issue24.dlt")).ToList();
        var async = await DltReader.ReadMessagesAsync(DataPath("issue24.dlt")).ToListAsync();

        async.ShouldBe(sync);
    }
}