using ComputersShopBusinessLogic.MailWorker;
using ComputersShopContracts.BindingModels;
using ComputersShopContracts.BuisnessLogicsContracts;
using ComputersShopContracts.BusinessLogicsContracts;
using ComputersShopContracts.SearchModels;
using ComputersShopContracts.StoragesContracts;
using ComputersShopContracts.ViewModels;
using ComputersShopDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputersShopBusinessLogic.BusinessLogics
{
    public class OrderLogic: IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        static readonly object locker = new object();
        private readonly AbstractMailWorker _mailWorker;
        private readonly IClientLogic _clientLogic;
        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, AbstractMailWorker mailWorker, IClientLogic clientLogic)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _mailWorker = mailWorker;
            _clientLogic = clientLogic;
        }
        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id:{Id}", model?.Id);
            var list = model == null ? _orderStorage.GetFullList() : _orderStorage.GetFiltredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }
		public OrderViewModel? ReadElement(OrderSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			_logger.LogInformation("ReadElement. Id:{ Id}", model.Id);

			var element = _orderStorage.GetElement(model);
			if (element == null)
			{
				_logger.LogWarning("ReadElement element not found");
				return null;
			}

			_logger.LogInformation("ReadElement find. Id:{Id}", element.Id);

			return element;
		}

		public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            if (model.Status != OrderStatus.Неизвестен)
            {
                _logger.LogWarning("Wrong order status. Insert operation failed");
                return false;
            }
            model.Status = OrderStatus.Принят;
            var order = _orderStorage.Insert(model);
			if (order == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
			SendOrderMessage(order.ClientId, $"DNS, Заказ №{order.Id}", $"Заказ №{order.Id} от {order.DateCreate} на сумму {order.Sum:0.00} принят");
			return true;
        }
        public bool ChangeStatus(OrderBindingModel model, OrderStatus newStatus)
        {
			CheckModel(model, false);
			var element = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
			if (element == null)
			{
				_logger.LogWarning("Read operation failed");
				return false;
			}
			if (element.Status != newStatus - 1)
			{
				_logger.LogWarning("Status change operation failed");
				throw new InvalidOperationException("Текущий статус заказа не может быть переведен в выбранный");
			}
            if (element.ImplementerId.HasValue)
            {
                model.ImplementerId = element.ImplementerId;
            }
			OrderStatus oldStatus = model.Status;
			model.Status = newStatus;
            if (model.Status == OrderStatus.Выдан)
            {
                model.DateImplement = DateTime.Now;
            }
            var order = _orderStorage.Update(model);
			if (order == null)
			{
				model.Status = oldStatus;
				_logger.LogWarning("Update operation failed");
				return false;
			}
			SendOrderMessage(order.ClientId, $"DNS, Заказ №{order.Id}", $"Заказ №{order.Id} от {order.DateCreate} на сумму {order.Sum:0.00} принят");
			return true;
		}
        public bool TakeOrderInWork(OrderBindingModel model)
        {
            lock (locker)
            {
				return ChangeStatus(model, OrderStatus.Выполняется);
			}
        }
        public bool FinishOrder(OrderBindingModel model)
        {
            return ChangeStatus(model, OrderStatus.Готов);
        }
        public bool DeliveryOrder(OrderBindingModel model)
        {
            return ChangeStatus(model, OrderStatus.Выдан);
        }
        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Цена должна быть больше 0", nameof(model.Sum));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Количество изделий должно быть больше 0", nameof(model.Count));
            }
            if (model.DateImplement != null && model.DateImplement < model.DateCreate)
            {
                throw new ArithmeticException("Дата завершения не может быть раньше даты начала");
            }
            _logger.LogInformation("Order. Id:{Id}. Sum:{Sum}. ComputerId:{ComputerId}", model.Id, model.Sum, model.ComputerId);
        }
        private bool SendOrderMessage(int clientId, string subject, string text)
        {
            var client = _clientLogic.ReadElement(new() { Id = clientId });
            if (client == null)
            {
                return false;
            }
            _mailWorker.MailSendAsync(new()
            {
                MailAddress = client.Email,
                Subject = subject,
                Text = text
            });
            return true;
        }
    }
}