using AircraftPlantBusinessLogic.MailWorker;
using AircraftPlantContracts.BindingModels;
using AircraftPlantContracts.BusinessLogicsContracts;
using AircraftPlantContracts.SearchModels;
using AircraftPlantContracts.StoragesContracts;
using AircraftPlantContracts.ViewModels;
using AircraftPlantDataModels.Enums;
using AircraftPlantDataModels.Models;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AircraftPlantBusinessLogic.BusinessLogics
{
    /// <summary>
    /// Реализация интерфейса бизнес-логики для заказов
    /// </summary>
    public class OrderLogic : IOrderLogic
    {
        /// <summary>
        /// Логгер
        /// </summary>
        private readonly ILogger _logger;

        /// <summary>
        /// Взаимодействие с хранилищем заказов
        /// </summary>
        private readonly IOrderStorage _orderStorage;

        static readonly object locker = new();

        /// <summary>
        /// Взаимодействие с хранилищем клиентов
        /// </summary>
        private readonly IClientStorage _clientStorage;

        /// <summary>
        /// Бизнес-логика для отправки писем
        /// </summary>
        private readonly AbstractMailWorker _mailLogic;

        /// <summary>
        /// Конструктор
        /// </summary>
        /// <param name="logger"></param>
        /// <param name="orderStorage"></param>
        /// <param name="clientStorage"></param>
        /// <param name="mailLogic"></param>
        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IClientStorage clientStorage, AbstractMailWorker mailLogic)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _clientStorage = clientStorage;
            _mailLogic = mailLogic;
        }

        /// <summary>
        /// Получение списка
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            _logger.LogInformation("ReadList. Order.Id:{ Id}", model?.Id);

            var list = model == null ? _orderStorage.GetFullList() : _orderStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }

            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

        /// <summary>
        /// Получение отдельной записи
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentNullException"></exception>
        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;
        }

        /// <summary>
        /// Создание заказа
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            if (model.Status != OrderStatus.Неизвестен)
            {
                _logger.LogWarning("Insert operation failed. Order status incorrect.");
                return false;
            }

            model.Status = OrderStatus.Принят;

            var order = _orderStorage.Insert(model);
            if (order == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }

            SendEmail(order);
            return true;
        }

        /// <summary>
        /// Смена статуса заказа (Выполняется)
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>

        public bool TakeOrderInWork(OrderBindingModel model)
        {
            lock (locker)
            {
                return StatusUpdate(model, OrderStatus.Выполняется);
            }
        }

        /// <summary>
        /// Смена статуса заказа (Выдан)
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public bool FinishOrder(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Выдан);
        }

        /// <summary>
        /// Смена статуса заказа (Готов)
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public bool DeliveryOrder(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Готов);
        }

        /// <summary>
        /// Проверка модели заказа
        /// </summary>
        /// <param name="model"></param>
        /// <param name="withParams"></param>
        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.PlaneId < 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор изделия", nameof(model.PlaneId));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Количество изделий в заказе должно быть больше 0", nameof(model.Count));
            }
            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Сумма заказа должна быть больше 0", nameof(model.Sum));
            }
            _logger.LogInformation("Order. OrderID:{Id}.Sum:{ Sum}. PlaneId: { PlaneId}", model.Id, model.Sum, model.PlaneId);
        }

        /// <summary>
        /// Смена статуса заказа
        /// </summary>
        /// <param name="model"></param>
        /// <param name="newStatus"></param>
        /// <returns></returns>
        private bool StatusUpdate(OrderBindingModel model, OrderStatus newStatus)
        {
            var element = _orderStorage.GetElement(new OrderSearchModel
            {
                Id = model.Id
            });
            if (element == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (element.Status + 1 != newStatus)
            {
                _logger.LogWarning("Change status operation failed");
                return false;
            }

            model.Status = newStatus;

            if (element.ImplementerId.HasValue)
            {
                model.ImplementerId = element.ImplementerId;
            }
            if (model.Status == OrderStatus.Готов)
            {
                model.DateImplement = DateTime.Now;
            }
            else
            {
                model.DateImplement = element.DateImplement;
            }

            CheckModel(model, false);
            var order = _orderStorage.Update(model);
            if (order == null)
            {
                _logger.LogWarning("Change status operation failed");
                return false;
            }

            SendEmail(order);
            return true;
        }

        /// <summary>
        /// Отправить письмо
        /// </summary>
        /// <param name="model"></param>
        public void SendEmail(OrderViewModel order)
        {
            if (order == null)
            {
                return;
            }

            var client = _clientStorage.GetElement(new ClientSearchModel { Id = order.ClientId });
            if (client == null)
            {
                return;
            }

            MailSendInfoBindingModel mailModel;
            if (order.Status == OrderStatus.Принят)
            {
                mailModel = new MailSendInfoBindingModel
                {
                    MailAddress = client.Email,
                    Subject = $"Order №{order.Id}",
                    Text = $"Ваш заказ №{order.Id} от {order.DateCreate} на сумму {order.Sum} был принят!"
                };
            }
            else
            {
                mailModel = new MailSendInfoBindingModel
                {
                    MailAddress = client.Email,
                    Subject = $"Order №{order.Id}",
                    Text = $"Заказ №{order.Id} изменен статус на {order.Status}"
                };
            }

            _mailLogic.MailSendAsync(mailModel);
        }
    }
}