namespace BuildFlow.Architecture.Tests;

using Xunit;

/// <summary>
/// RAG 知识库 HTTP 校验器的契约测试。确保 Host 入口允许的策略范围与应用层保持一致。
/// </summary>
public class RagKnowledgeBaseValidatorTests
{
    [Theory]
    [InlineData("CreateKnowledgeBaseRequestValidator.cs")]
    [InlineData("UpdateKnowledgeBaseRequestValidator.cs")]
    public void KnowledgeBaseValidatorsShouldAllowAllImplementedChunkingModes(string fileName)
    {
        var repoRoot = FindRepoRoot();
        var validatorPath = Path.Combine(
            repoRoot.FullName,
            "src",
            "BuildFlow.Host",
            "Endpoints",
            "Rag",
            "KnowledgeBase",
            fileName);
        var source = File.ReadAllText(validatorPath);

        Assert.Contains(".InclusiveBetween(0, 5)", source);
        Assert.DoesNotContain(".InclusiveBetween(0, 2).When(x => x.ChunkingMode.HasValue)", source);
        Assert.Contains("0=General,1=Heading,2=ParentChild,3=Separator,4=ByPage,5=Token", source);
    }

    private static DirectoryInfo FindRepoRoot()
    {
        var current = new DirectoryInfo(AppContext.BaseDirectory);
        while (current is not null)
        {
            if (File.Exists(Path.Combine(current.FullName, "BuildFlow.slnx")))
            {
                return current;
            }

            current = current.Parent;
        }

        throw new InvalidOperationException("无法定位 BuildFlow.slnx，无法验证 RAG 知识库校验器。");
    }
}