using System.Collections.Generic;

namespace StellaOps.Provcache;

/// <summary>
/// Result of a batch cache lookup.
/// </summary>
public sealed record ProvcacheBatchLookupResult
{
    /// <summary>
    /// Entries found in cache, keyed by VeriKey.
    /// </summary>
    public required IReadOnlyDictionary<string, ProvcacheEntry> Hits { get; init; }

    /// <summary>
    /// VeriKeys that were not found in cache.
    /// </summary>
    public required IReadOnlyList<string> Misses { get; init; }

    /// <summary>
    /// Time taken for the lookup in milliseconds.
    /// </summary>
    public double ElapsedMs { get; init; }

    /// <summary>
    /// Cache hit rate for this batch (0.0 - 1.0).
    /// </summary>
    public double HitRate => Hits.Count == 0 && Misses.Count == 0
        ? 0.0
        : (double)Hits.Count / (Hits.Count + Misses.Count);
}