// SPDX-License-Identifier: BUSL-1.1
// Copyright (c) StellaOps

using StellaOps.Scanner.Core.Epss;

namespace StellaOps.Scanner.Worker.Processing;

/// <summary>
/// Null implementation of IEpssProvider for when EPSS storage is not configured.
/// </summary>
internal sealed class NullEpssProvider : IEpssProvider
{
    public Task<EpssEvidence?> GetCurrentAsync(string cveId, CancellationToken cancellationToken = default)
        => Task.FromResult<EpssEvidence?>(null);

    public Task<EpssBatchResult> GetCurrentBatchAsync(IEnumerable<string> cveIds, CancellationToken cancellationToken = default)
        => Task.FromResult(new EpssBatchResult { Found = [], NotFound = cveIds.ToList(), ModelDate = DateOnly.MinValue });

    public Task<EpssEvidence?> GetAsOfDateAsync(string cveId, DateOnly asOfDate, CancellationToken cancellationToken = default)
        => Task.FromResult<EpssEvidence?>(null);

    public Task<IReadOnlyList<EpssEvidence>> GetHistoryAsync(string cveId, DateOnly startDate, DateOnly endDate, CancellationToken cancellationToken = default)
        => Task.FromResult<IReadOnlyList<EpssEvidence>>([]);

    public Task<DateOnly?> GetLatestModelDateAsync(CancellationToken cancellationToken = default)
        => Task.FromResult<DateOnly?>(null);

    public Task<bool> IsAvailableAsync(CancellationToken cancellationToken = default)
        => Task.FromResult(false);
}