using Bitget_Server.Application.Services;

namespace Bitget_Server.Application.BackgroundServices;

/// <summary>
/// 기존 MainForm.Signalnfo → IndicatorProcess.calProcess 무한 루프 이식.
/// SignalProcessService.ProcessOnceAsync 를 짧은 주기로 반복 호출한다.
/// </summary>
public class SignalProcessBackgroundService : BackgroundService
{
    private readonly SignalProcessService _signalProcess;
    private readonly ILogger<SignalProcessBackgroundService> _logger;

    /// <summary>신호 검색 루프 1회 처리 후 대기 시간 (기존 while 루프는 Thread.Sleep 없이 반복되었으나 CPU 과점유 방지를 위해 200ms 부여).</summary>
    private static readonly TimeSpan LoopInterval = TimeSpan.FromMilliseconds(200);

    public SignalProcessBackgroundService(
        SignalProcessService signalProcess,
        ILogger<SignalProcessBackgroundService> logger)
    {
        _signalProcess = signalProcess;
        _logger = logger;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogInformation("SignalProcessBackgroundService 시작 (Interval={Ms}ms)", LoopInterval.TotalMilliseconds);

        while (!stoppingToken.IsCancellationRequested)
        {
            try
            {
                await _signalProcess.ProcessOnceAsync(stoppingToken).ConfigureAwait(false);
            }
            catch (OperationCanceledException) { /* shutdown */ }
            catch (Exception ex)
            {
                _logger.LogWarning(ex, "SignalProcess 1회 처리 오류");
            }

            try
            {
                await Task.Delay(LoopInterval, stoppingToken).ConfigureAwait(false);
            }
            catch (OperationCanceledException) { /* shutdown */ }
        }

        _logger.LogInformation("SignalProcessBackgroundService 종료");
    }
}