using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using PARR.DAL.Models;
using PARR.DAL.Services.Interfaces;
using PARR.EsppApi.Models;

namespace PARR.EsppOrderLoader.Services
{
    internal class OrderItemService : IOrderItemService
    {
        private readonly ILogger<OrderItemService> logger;
        private readonly IOrderService orderService;
        private readonly ITemplateService templateService;
        private readonly IOrderStatusService orderStatusService;

        public OrderItemService(
            ILogger<OrderItemService> logger,
            IOrderService orderService,
            ITemplateService templateService,
            IOrderStatusService orderStatusService
            )
        {
            this.orderService = orderService;
            this.templateService = templateService;
            this.orderStatusService = orderStatusService;
            this.logger = logger;
        }


        public async Task WriteOrderAsync(EsppOrder esppOrder)
        {
            var existOrder = await orderService.Get().FirstOrDefaultAsync(t => t.Number.ToLower() == esppOrder.Number.ToLower());
            if (existOrder != null)
            {
                logger.LogInformation($"Наряд {esppOrder.Number} уже есть в БД. Пропускаю.");
                return;
            }

            var template = await templateService.Get()
                                .Include(t => t.ApplicationsInWork)
                                .FirstOrDefaultAsync(t => t.Name.ToLower() == esppOrder.TemplateName.ToLower());

            if (template == null)
                logger.LogWarning($"Не найден шаблон для наряда {esppOrder.Number}, краткое описание наряда: {esppOrder.ShortName}. {esppOrder.WorkGroup}");

            var newOrder = new Order
            {
                Id = Guid.NewGuid(),
                Number = esppOrder.Number,
                WorkGroup = esppOrder.WorkGroup,
                ShortName = esppOrder.ShortName,
                TemplateId = template?.Id,
                StatusCode = (int)orderStatusService.GetOrderStatusByName(esppOrder.Status),
                GenerateDate = template == null ?
                                                null
                                                : CalcGenerationDate(esppOrder.ExpirationDateUTC, template.ApplicationsInWork!.TemplateDuration)
            };

            if (!await orderService.CreateAsync(newOrder) || !await orderService.CommitAsync())
                logger.LogError($"Ошибка при добавлении новой записи наряда в БД. {esppOrder.Number}, {esppOrder.WorkGroup}, {esppOrder.ShortName}");
            else
                logger.LogInformation($"Добавлен наряд в БД: {esppOrder.Number}, {esppOrder.ShortName}");
        }


        private DateTimeOffset? CalcGenerationDate(DateTimeOffset expirationDateUTC, string templateDuration)
        {
            TimeSpan duration;

            try
            {
                //ЕСПП кривоногие, они почему-то таймспан пишут так "7 00:00:00", а правильно так: "7:00:00:00"
                var durationWithTimeSpanFormat = templateDuration.Replace(" ", ":");
                duration = TimeSpan.Parse(durationWithTimeSpanFormat);
            }
            catch (Exception e)
            {
                logger.LogError(e, $"Ошибка при конвертации templateDuration в TimeSpan, исходное значение: {templateDuration}");
                return null;
            }

            return expirationDateUTC.Add(-duration);
        }

    }
}