using BuildFlow.Infrastructure.AI;
using Xunit;

namespace BuildFlow.Rag.Tests;

/// <summary>
/// OpenAI 兼容流式响应解析测试。覆盖 LM Studio 返回的 content 与 reasoning_content 分离场景。
/// </summary>
public class OpenAiCompatibleChatStreamParserTests
{
    [Fact]
    public void ReadContentDeltaShouldReturnOnlyVisibleContent()
    {
        const string data = """
            {"choices":[{"delta":{"content":"你好"}}]}
            """;

        var chunk = OpenAiCompatibleChatStreamParser.ReadContentDelta(data);

        Assert.Equal("你好", chunk);
    }

    [Fact]
    public void ReadContentDeltaShouldIgnoreReasoningContent()
    {
        const string data = """
            {"choices":[{"delta":{"reasoning_content":"这里是推理过程"}}]}
            """;

        var chunk = OpenAiCompatibleChatStreamParser.ReadContentDelta(data);

        Assert.Null(chunk);
    }

    [Fact]
    public void ReadContentDeltaShouldIgnoreDoneSentinel()
    {
        var chunk = OpenAiCompatibleChatStreamParser.ReadContentDelta("[DONE]");

        Assert.Null(chunk);
    }
}