using System;
using System.Threading;
using System.Threading.Tasks;

namespace StellaOps.Provcache;

public sealed partial class WriteBehindQueue
{
    /// <inheritdoc />
    public ValueTask EnqueueAsync(ProvcacheEntry entry, CancellationToken cancellationToken = default)
    {
        ArgumentNullException.ThrowIfNull(entry);

        var item = new WriteBehindItem
        {
            Entry = entry,
            EnqueuedAt = _timeProvider.GetUtcNow(),
            RetryCount = 0
        };

        Interlocked.Increment(ref _totalEnqueued);
        Interlocked.Increment(ref _currentQueueDepth);
        ProvcacheTelemetry.SetWriteBehindQueueSize((int)Interlocked.Read(ref _currentQueueDepth));

        return _channel.Writer.WriteAsync(item, cancellationToken);
    }
}