using System;

namespace StellaOps.Notify.Worker;

public sealed class NotifyWorkerOptions
{
    /// <summary>
    /// Worker identifier prefix; defaults to machine name.
    /// </summary>
    public string? WorkerId { get; set; }

    /// <summary>
    /// Number of messages to lease per iteration.
    /// </summary>
    public int LeaseBatchSize { get; set; } = 16;

    /// <summary>
    /// Duration a lease remains active before it becomes eligible for claim.
    /// </summary>
    public TimeSpan LeaseDuration { get; set; } = TimeSpan.FromSeconds(30);

    /// <summary>
    /// Delay applied when no work is available.
    /// </summary>
    public TimeSpan IdleDelay { get; set; } = TimeSpan.FromMilliseconds(250);

    /// <summary>
    /// Maximum number of event leases processed concurrently.
    /// </summary>
    public int MaxConcurrency { get; set; } = 4;

    /// <summary>
    /// Maximum number of consecutive failures before the worker delays.
    /// </summary>
    public int FailureBackoffThreshold { get; set; } = 3;

    /// <summary>
    /// Delay applied when the failure threshold is reached.
    /// </summary>
    public TimeSpan FailureBackoffDelay { get; set; } = TimeSpan.FromSeconds(5);

    internal string ResolveWorkerId()
    {
        if (!string.IsNullOrWhiteSpace(WorkerId))
        {
            return WorkerId!;
        }

        var host = Environment.MachineName;
        return $"{host}-{Guid.NewGuid():n}";
    }
}