using FluentAssertions;
using Microsoft.Extensions.Logging.Abstractions;
using StellaOps.Replay.Loaders;
using StellaOps.TestKit;
using Xunit;

namespace StellaOps.Replay.Tests;

public sealed class FeedSnapshotLoaderTests
{
    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public async Task LoadByDigestAsync_InvalidDigest_ThrowsFormatException()
    {
        var loader = new FeedSnapshotLoader(new FeedStorageStub(null), NullLogger<FeedSnapshotLoader>.Instance);
        var digest = SnapshotTestData.CreateInvalidDigest('a');

        var action = () => loader.LoadByDigestAsync(digest);

        await action.Should().ThrowAsync<FormatException>();
    }

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public async Task LoadByDigestAsync_ShortDigest_ThrowsFormatException()
    {
        var loader = new FeedSnapshotLoader(new FeedStorageStub(null), NullLogger<FeedSnapshotLoader>.Instance);
        var digest = new string('a', 63);

        var action = () => loader.LoadByDigestAsync(digest);

        await action.Should().ThrowAsync<FormatException>();
    }

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public async Task LoadByDigestAsync_DigestMismatch_ThrowsException()
    {
        var snapshot = SnapshotTestData.CreateFeedSnapshot(SnapshotTestData.CreateValidDigest('b'));
        var actualDigest = SnapshotTestData.ComputeDigest(snapshot);
        var expectedDigest = SnapshotTestData.CreateDifferentDigest(actualDigest);
        var loader = new FeedSnapshotLoader(new FeedStorageStub(snapshot), NullLogger<FeedSnapshotLoader>.Instance);

        var action = () => loader.LoadByDigestAsync(expectedDigest);

        await action.Should().ThrowAsync<DigestMismatchException>();
    }
}