using System.Diagnostics.Metrics;

namespace StellaOps.Scanner.Cache;

public static class ScannerCacheMetrics
{
    public const string MeterName = "StellaOps.Scanner.Cache";

    private static readonly Meter Meter = new(MeterName, "1.0.0");

    private static readonly Counter<long> LayerHits = Meter.CreateCounter<long>("scanner.layer_cache_hits_total");
    private static readonly Counter<long> LayerMisses = Meter.CreateCounter<long>("scanner.layer_cache_misses_total");
    private static readonly Counter<long> LayerEvictions = Meter.CreateCounter<long>("scanner.layer_cache_evictions_total");
    private static readonly Histogram<long> LayerBytes = Meter.CreateHistogram<long>("scanner.layer_cache_bytes");
    private static readonly Counter<long> FileCasHits = Meter.CreateCounter<long>("scanner.file_cas_hits_total");
    private static readonly Counter<long> FileCasMisses = Meter.CreateCounter<long>("scanner.file_cas_misses_total");
    private static readonly Counter<long> FileCasEvictions = Meter.CreateCounter<long>("scanner.file_cas_evictions_total");
    private static readonly Histogram<long> FileCasBytes = Meter.CreateHistogram<long>("scanner.file_cas_bytes");

    public static void RecordLayerHit(string layerDigest)
        => LayerHits.Add(1, new KeyValuePair<string, object?>("layer", layerDigest));

    public static void RecordLayerMiss(string layerDigest)
        => LayerMisses.Add(1, new KeyValuePair<string, object?>("layer", layerDigest));

    public static void RecordLayerEviction(string layerDigest)
        => LayerEvictions.Add(1, new KeyValuePair<string, object?>("layer", layerDigest));

    public static void RecordLayerBytes(long bytes)
        => LayerBytes.Record(bytes);

    public static void RecordFileCasHit(string sha256)
        => FileCasHits.Add(1, new KeyValuePair<string, object?>("sha256", sha256));

    public static void RecordFileCasMiss(string sha256)
        => FileCasMisses.Add(1, new KeyValuePair<string, object?>("sha256", sha256));

    public static void RecordFileCasEviction(string sha256)
        => FileCasEvictions.Add(1, new KeyValuePair<string, object?>("sha256", sha256));

    public static void RecordFileCasBytes(long bytes)
        => FileCasBytes.Record(bytes);
}