using System;
using AAIntegration.SimmonsBank.API.Configs;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using AAIntegration.SimmonsBank.API.Processes;
using AAIntegration.SimmonsBank.API.Services;

namespace AAIntegration.SimmonsBank.API.Workers;

public class EnvelopeFundWorker : BackgroundService
{
   private readonly EnvelopeFundConfig _config;
   private readonly IEnvelopeFundingProcess _envelopeFundingProcess;
   private readonly ILogger<EnvelopeFundWorker> _logger;
   private readonly IServiceScopeFactory _serviceScopeFactory;

   public EnvelopeFundWorker(IOptions<EnvelopeFundConfig> config, IEnvelopeFundingProcess envelopeFundingProcess, ILogger<EnvelopeFundWorker> logger, IServiceScopeFactory serviceScopeFactory)
   {
      _config = config.Value;
      _envelopeFundingProcess = envelopeFundingProcess;
      _logger = logger;
      _serviceScopeFactory = serviceScopeFactory;
   }

   protected override async Task ExecuteAsync(CancellationToken stoppingToken)
   {
      DateTime? lastExecutedOn = null;
      
      using (var scope = _serviceScopeFactory.CreateScope())
      {
         IEnvelopeService envelopeService = scope.ServiceProvider.GetService<IEnvelopeService>();

         // This is how we keep the app running (in the background)
         while (!stoppingToken.IsCancellationRequested)
         {
            if (lastExecutedOn != null)
            {
               int minutesRemaining = _config.CheckIntervalInMinutes - (int)DateTime.UtcNow.Subtract(lastExecutedOn.Value).TotalMinutes;
               await Task.Delay(TimeSpan.FromMinutes(minutesRemaining < 0 ? 0 : minutesRemaining), stoppingToken);
            }

            lastExecutedOn = DateTime.UtcNow;
            _logger.LogInformation("EnvelopeFundWorker running at: {time}", DateTimeOffset.Now);

            await _envelopeFundingProcess.FundEnvelopes(envelopeService);
         }
      }
   }
}