using Confluent.Kafka;

namespace Cloud.Services
{
	public class ConsumerService
	{
		private IConsumer<string, string> _consumer;
		private ConsumerConfig consumerConfig;
		public ConsumerService(IConfiguration configuration)
		{
			consumerConfig = new ConsumerConfig
			{
				BootstrapServers = configuration["Kafka:BootstrapServers"],
				GroupId = configuration["Kafka:GroupId"],
				AutoOffsetReset = AutoOffsetReset.Earliest,
			};
			
			_consumer = new ConsumerBuilder<string, string>(consumerConfig).Build();
		}

		//Consume Method
		public async Task<string>WaitMessage(string topic)
		{
			try
			{
				_consumer.Subscribe(topic);

				var consumeResult = _consumer.Consume(TimeSpan.FromMilliseconds(1000));

				if (consumeResult != null)
				{
					return consumeResult.Message.Value;
				}
				else
				{
					//No message received from Kafka within the specified timeout.
				}
				return "";

			}
			catch (Exception ex)
			{
				return "";
			}
			finally
			{
				_consumer.Close();
			}
		}
	}
}