using Microsoft.Extensions.DependencyInjection;
using NCrontab;
using YLErp.Modules.AppModule;
using YLErp.Modules.SwapModule;

namespace YLErp.Web.App
{
    public class SendKafkaTask : IHostedService, IDisposable
    {
        private readonly IYcLogger _logger;
        private readonly CancellationTokenSource _cts = new CancellationTokenSource();
        private readonly string _cronExpression = "";
        private CrontabSchedule _schedule; // cron 表达式解析后的时间表
        public SendKafkaTask(IConfiguration configuration)
        {
            _logger = LogFactory.GetLogger("SendKafkaTask");
            _cronExpression = configuration.GetValue<string>("SendKafakaCron");
            _schedule = CrontabSchedule.Parse(_cronExpression);
        }
        public Task StartAsync(CancellationToken cancellationToken)
        {
            _logger.Info("SendKafkaTask task is starting.");
            Task.Run(() => ExecuteTask(_cts.Token), _cts.Token);
            return Task.CompletedTask;
        }
        public async Task StopAsync(CancellationToken cancellationToken)
        {
            _logger.Info("SendKafkaTask task is stopping.");
            _cts.Cancel();
            await Task.CompletedTask;
        }
        public void Dispose()
        {
            _cts.Dispose();
        }
        private async Task ExecuteTask(CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested)
            {
                var now = DateTime.Now;
                var nextOccurrence = _schedule.GetNextOccurrence(now);
                var delay = nextOccurrence - now;
                if (delay.TotalMilliseconds > 0)
                {
                    _logger.Info($"Waiting  SendKafkaTask {delay.TotalMilliseconds} ms until {nextOccurrence}");
                    await Task.Delay(delay, cancellationToken);
                }
                // 执行任务
                await Task.Run(async () => {
                    new SwapRateService(OptUserInfo.SystemUser).SendAllSwapRateToKafka();
                    new EtradingRuleService(OptUserInfo.SystemUser).SendAllEtradingRuleToKafka();
                }, cancellationToken);
            }
        }
    }
}