using System;
using Svrnty.CQRS.Events.Abstractions.Streaming;
using Svrnty.CQRS.Events.Abstractions;

namespace Svrnty.CQRS.Events.Metrics;

/// <summary>
/// No-op implementation of <see cref="IEventStreamMetrics"/> for when metrics are disabled.
/// All methods are empty and have no performance overhead.
/// </summary>
public sealed class NoOpEventStreamMetrics : IEventStreamMetrics
{
    /// <summary>
    /// Singleton instance to avoid allocations.
    /// </summary>
    public static readonly NoOpEventStreamMetrics Instance = new();

    private NoOpEventStreamMetrics()
    {
    }

    /// <inheritdoc />
    public void RecordEventPublished(string streamName, string eventType)
    {
        // No-op
    }

    /// <inheritdoc />
    public void RecordEventConsumed(string streamName, string subscriptionId, string eventType)
    {
        // No-op
    }

    /// <inheritdoc />
    public void RecordProcessingLatency(string streamName, string subscriptionId, TimeSpan latency)
    {
        // No-op
    }

    /// <inheritdoc />
    public void RecordConsumerLag(string streamName, string subscriptionId, long lag)
    {
        // No-op
    }

    /// <inheritdoc />
    public void RecordError(string streamName, string? subscriptionId, string errorType)
    {
        // No-op
    }

    /// <inheritdoc />
    public void RecordRetry(string streamName, string subscriptionId, int attemptNumber)
    {
        // No-op
    }

    /// <inheritdoc />
    public void RecordStreamLength(string streamName, long length)
    {
        // No-op
    }

    /// <inheritdoc />
    public void RecordActiveConsumers(string streamName, string subscriptionId, int consumerCount)
    {
        // No-op
    }
}