using YD_TrainingCompetition_Api.Competition;

namespace YD_TrainingCompetition_Api.Services;

// 单独的倒计时后台服务，每秒推动一次比赛会话状态。
// 这样即使设备端没有持续上报时间，前端也能稳定看到倒计时变化。
public sealed class CompetitionCountdownWorker : BackgroundService
{
    private readonly ICompetitionSessionService _competition;

    public CompetitionCountdownWorker(ICompetitionSessionService competition)
    {
        _competition = competition;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        using var timer = new PeriodicTimer(TimeSpan.FromSeconds(1));
        while (await timer.WaitForNextTickAsync(stoppingToken))
        {
            await _competition.TickAsync(stoppingToken);
        }
    }
}