using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using PARR.BLL.Services.Interfaces;
using PARR.DAL.Services.Interfaces;
using PARR.DAL.TransformServices;
using PARR.NextRun.Settings;

namespace PARR.NextRun
{
    internal class NextRunManager : INextRunManager
    {
        private readonly WorkerSettings workerSettings;
        private readonly ILogger<NextRunManager> logger;
        private readonly IIntervalService intervalService;
        private readonly IServiceProvider serviceProvider;

        public NextRunManager(
            WorkerSettings workerSettings,
            ILogger<NextRunManager> logger,
            IIntervalService intervalService,
            IServiceProvider serviceProvider
            )
        {
            this.workerSettings = workerSettings;
            this.logger = logger;
            this.intervalService = intervalService;
            this.serviceProvider = serviceProvider;
        }

        public async Task StartAsync()
        {
            logger.LogInformation("Запуск сервиса рассчета времени следующего создания наряда (nextRun)");

            await intervalService.IntervalInitAsync(async () =>
            {
                using (var scope = serviceProvider.CreateScope())
                {
                    var appInWorkService = scope.ServiceProvider.GetService<IApplicationsInWorkService>();
                    var esppSchService = scope.ServiceProvider.GetService<IEsppScheduleTransformService>();

                    if (appInWorkService == null || esppSchService == null)
                        throw new Exception("Не смог получить серивс IApplicationsInWorkService или IEsppScheduleTransformService");

                    await HandlerAsync(appInWorkService, esppSchService);
                }
            }, workerSettings.RepeatEvery);
        }


        /// <summary>
        /// Рассчет следующей даты срабатываения
        /// </summary>
        /// <returns></returns>
        private async Task HandlerAsync(IApplicationsInWorkService applicationsInWorkService, IEsppScheduleTransformService esppScheduleTransformService)
        {
            var objs = await applicationsInWorkService.Get().Where(t => t.NextRun < DateTimeOffset.UtcNow).ToListAsync();

            logger.LogDebug($"Объектов для обновления: {objs.Count()} шт.");

            int errorsCount = 0;

            foreach (var obj in objs)
            {
                var nextRun = await esppScheduleTransformService.GetNextDateAsync(obj.Id, obj.NextRun);
                obj.NextRun = nextRun;

                if (await applicationsInWorkService.CommitAsync())
                    logger.LogDebug($"Обновлено значение поле NextRun {obj.NextRun} для строки {obj.Id}");
                else
                {
                    logger.LogError($"Ошибка при обновлении значения поля NextRun {obj.NextRun} для строки {obj.Id}");
                    errorsCount++;
                }
            }

            logger.LogInformation($"Завершено обновление полей NextRun. Полей в задании: {objs.Count()}, обновлено: {objs.Count() - errorsCount}, ошибок: {errorsCount}");
        }
    }
}