using System.Threading;
using System;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using AyaNova.Biz;
using AyaNova.Util;

namespace AyaNova.Generator
{
    //Implemented from a example here
    //https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/multi-container-microservice-net-applications/background-tasks-with-ihostedservice

    /*
    LOOKAT: Generator tasks that should happen:
    - Periodically erase any temp files written to userfiles root (attachments temp files) that are older than a day
        - These files should be normally erased within seconds after uploading and processing into their permanent folder but shit will go wrong
     */

    public class GeneratorService : BackgroundService
    {
        private readonly ILogger<GeneratorService> log;
        // private const int MAXIMUM_MS_ALLOWED_FOR_PROCESSING_ALL_JOBS = 1 * 60 * 1000;//1 minutes TEST TEST TEST #####
// #if (DEBUG)
//         private const int GENERATE_SECONDS = 1;
// #else
//         private const int GENERATE_SECONDS = 20;
// #endif




        public GeneratorService(ILogger<GeneratorService> logger)
        {
            log = logger;
        }


        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {

            log.LogInformation($"GeneratorService is starting.");

            stoppingToken.Register(() =>
                    log.LogDebug($" GeneratorService background task is stopping."));


            while (!stoppingToken.IsCancellationRequested)
            {
                if (!ServerGlobalOpsSettingsCache.BOOTING)
                {
                   // log.LogTrace($"GeneratorService running jobs");

                    //=================================================================
                    try
                    {
                        await JobsBiz.ProcessJobsAsync();
                    }
                    catch (Exception ex)
                    {
                        log.LogError(ex, "Generate::ProcessJobs result in exception error ");
                    }
                    //=================================================================
                }
              //There *MUST* be a delay here or the server will come to a standstill
              //ideally need to move on from this method of generation to something external or more reasonable but
              //this does work, we need to get to release, for our projected use load this should be fine and it's
              //a documented by MS method to do asp.net core job processing 
              //https://docs.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?view=aspnetcore-6.0&tabs=visual-studio
               await Task.Delay(1000);
            }
            log.LogInformation($"GeneratorService is stopping");
        }

        public override Task StopAsync(CancellationToken stoppingToken)
        {
            log.LogDebug($"GeneratorService StopAsync triggered");
            return Task.FromResult(0);
            // Run any needed clean-up actions
        }
    }//eoc
}//eons