using Microsoft.Extensions.Options;
using RabbitMQ.Client;
using RabbitMQ.Client.Exceptions;

public static class RabbitMqTestHelper
{
    public static void PurgeNotificationQueues(IOptions<RabbitMqOptions> opts)
    {
        var o = opts.Value;
        var factory = new ConnectionFactory
        {
            HostName = o.Host,
            Port = o.Port,
            UserName = o.Username,
            Password = o.Password,
        };

        using var connection = factory.CreateConnection("test-queue-purge");
        using var channel = connection.CreateModel();

        // x-message-ttl is immutable once the queue exists. A concurrently running dev API
        // (300000 ms) can recreate the DLQ after the test host provisions 5000 ms, leaving
        // escalation stuck until the 5-minute TTL expires — far beyond the test poll window.
        RecreatePagingDlq(channel, o.PagingAckTimeoutMs);

        foreach (var queue in new[] { "alerts.paging.queue", "alerts.escalation.queue" })
        {
            try
            {
                channel.QueuePurge(queue);
            }
            catch (OperationInterruptedException)
            {
                // Queue may not exist yet on a cold broker.
            }
        }
    }

    private static void RecreatePagingDlq(IModel channel, int pagingAckTimeoutMs)
    {
        const string dlq = "alerts.paging.dlq";

        try
        {
            channel.QueueDelete(dlq, ifUnused: false, ifEmpty: false);
        }
        catch (OperationInterruptedException)
        {
            // Queue may not exist yet on a cold broker.
        }

        channel.ExchangeDeclare(
            RabbitMqTopologyProvisioner.Exchange,
            ExchangeType.Direct,
            durable: true);

        channel.QueueDeclare(
            queue: dlq,
            durable: true,
            exclusive: false,
            autoDelete: false,
            arguments: new Dictionary<string, object>
            {
                ["x-message-ttl"] = pagingAckTimeoutMs,
                ["x-dead-letter-exchange"] = RabbitMqTopologyProvisioner.Exchange,
                ["x-dead-letter-routing-key"] = RabbitMqTopologyProvisioner.EscalKey,
            });
    }
}