using System.Diagnostics.Metrics;

namespace StellaOps.Scanner.Queue;

internal static class QueueMetrics
{
    private const string TransportTagName = "transport";

    private static readonly Meter Meter = new("StellaOps.Scanner.Queue");
    private static readonly Counter<long> EnqueuedCounter = Meter.CreateCounter<long>("scanner_queue_enqueued_total");
    private static readonly Counter<long> DeduplicatedCounter = Meter.CreateCounter<long>("scanner_queue_deduplicated_total");
    private static readonly Counter<long> AckCounter = Meter.CreateCounter<long>("scanner_queue_ack_total");
    private static readonly Counter<long> RetryCounter = Meter.CreateCounter<long>("scanner_queue_retry_total");
    private static readonly Counter<long> DeadLetterCounter = Meter.CreateCounter<long>("scanner_queue_deadletter_total");

    public static void RecordEnqueued(string transport) => EnqueuedCounter.Add(1, BuildTags(transport));

    public static void RecordDeduplicated(string transport) => DeduplicatedCounter.Add(1, BuildTags(transport));

    public static void RecordAck(string transport) => AckCounter.Add(1, BuildTags(transport));

    public static void RecordRetry(string transport) => RetryCounter.Add(1, BuildTags(transport));

    public static void RecordDeadLetter(string transport) => DeadLetterCounter.Add(1, BuildTags(transport));

    private static KeyValuePair<string, object?>[] BuildTags(string transport)
        => new[] { new KeyValuePair<string, object?>(TransportTagName, transport) };
}