using ConsoleApp2.Services;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace ConsoleApp2.HostedServices;

public class VoidOutputService : BackgroundService
{
    private readonly ILogger _logger;
    private readonly DataRecordQueue _consumerQueue;
    private readonly ProcessContext _context;

    public VoidOutputService([FromKeyedServices(ProcessStep.Consumer)] DataRecordQueue consumerQueue,
        ProcessContext context, ILogger<VoidOutputService> logger)
    {
        _consumerQueue = consumerQueue;
        _context = context;
        _logger = logger;
    }

    protected override Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogInformation("***** Void output service started, thread id: {ThreadId} *****", Environment.CurrentManagedThreadId);
        while (!_context.IsTransformCompleted || _consumerQueue.Count > 0)
        {
            if (_consumerQueue.TryDequeue(out var record))
                _context.AddOutput();
        }

        _context.CompleteOutput();
        _logger.LogInformation("***** Void output service completed *****");
        return Task.CompletedTask;
    }
}