using FluentAssertions;
using StellaOps.BinaryIndex.FixIndex.Models;
using StellaOps.BinaryIndex.FixIndex.Parsers;

namespace StellaOps.BinaryIndex.FixIndex.Tests.Parsers;

public sealed class PatchHeaderParserTests
{
    [Fact]
    public void ParsePatches_SkipsHeadersWithInvalidEncoding()
    {
        var options = new FixIndexParserOptions
        {
            PatchHeaderMaxLines = 3,
            PatchHeaderMaxChars = 200,
            PatchHeaderExcerptMaxLength = 120
        };
        var parser = new PatchHeaderParser(options, new FixedTimeProvider(DateTimeOffset.UnixEpoch));

        var patches = new[]
        {
            ("CVE-2024-9999.patch", "Binary\0Content", "sha256")
        };

        var results = parser.ParsePatches(patches, "debian", "bookworm", "pkg", "1.0.0").ToList();

        results.Should().BeEmpty();
    }

    [Fact]
    public void ParsePatches_RespectsLimitsAndUsesFixedTime()
    {
        var line1 = "Description: Fix CVE-2024-3333";
        var line2 = "Origin: upstream";
        var line3 = "Bug: https://example.test";
        var content = string.Join('\n', line1, line2, line3);

        var options = new FixIndexParserOptions
        {
            PatchHeaderMaxLines = 2,
            PatchHeaderMaxChars = 200,
            PatchHeaderExcerptMaxLength = line1.Length,
            PatchHeaderConfidence = 0.88m
        };
        var now = new DateTimeOffset(2025, 12, 30, 15, 0, 0, TimeSpan.Zero);
        var parser = new PatchHeaderParser(options, new FixedTimeProvider(now));

        var patches = new[]
        {
            ("patches/CVE-2024-3333.patch", content, "sha256")
        };

        var results = parser.ParsePatches(patches, "Ubuntu", "Jammy", "pkg", "1.0.0").ToList();

        results.Should().HaveCount(1);
        results[0].Distro.Should().Be("ubuntu");
        results[0].Release.Should().Be("jammy");
        results[0].Confidence.Should().Be(0.88m);
        results[0].CreatedAt.Should().Be(now);

        var evidence = (PatchHeaderEvidence)results[0].Evidence;
        evidence.HeaderExcerpt.Should().Be(line1);
    }
}