using ClaudeDo.Worker.Runner;

namespace ClaudeDo.Worker.Tests.Runner;

public sealed class MessageParserTests
{
    [Fact]
    public void WellFormed_Result_Line_Extracts_Result()
    {
        var line = """{"type":"result","result":"Hello **world**"}""";
        Assert.True(MessageParser.TryExtractResult(line, out var result));
        Assert.Equal("Hello **world**", result);
    }

    [Fact]
    public void Non_Result_Type_Returns_False()
    {
        var line = """{"type":"assistant","message":"hi"}""";
        Assert.False(MessageParser.TryExtractResult(line, out var result));
        Assert.Null(result);
    }

    [Fact]
    public void Missing_Type_Property_Returns_False()
    {
        var line = """{"result":"data"}""";
        Assert.False(MessageParser.TryExtractResult(line, out var result));
        Assert.Null(result);
    }

    [Fact]
    public void Malformed_Json_Returns_False_No_Throw()
    {
        var line = "this is not json {{{";
        Assert.False(MessageParser.TryExtractResult(line, out var result));
        Assert.Null(result);
    }

    [Fact]
    public void Empty_Line_Returns_False()
    {
        Assert.False(MessageParser.TryExtractResult("", out _));
        Assert.False(MessageParser.TryExtractResult("   ", out _));
    }

    [Fact]
    public void Null_Result_Value_Returns_True_With_Null()
    {
        var line = """{"type":"result","result":null}""";
        Assert.True(MessageParser.TryExtractResult(line, out var result));
        Assert.Null(result);
    }
}