using CarRepairShopBusinessLogic.MailWorker;
using CarRepairShopContracts.BindingModels;
using CarRepairShopContracts.BusinessLogicsContracts;
using CarRepairShopContracts.SearchModels;
using CarRepairShopContracts.StoragesContracts;
using CarRepairShopContracts.ViewModels;
using CarRepairShopDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace CarRepairShopBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly IClientStorage _clientStorage;
        private readonly AbstractMailWorker _mailLogic;
        static readonly object locker = new object();

        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IClientStorage clientStorage, AbstractMailWorker worker)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _clientStorage = clientStorage;
            _mailLogic = worker;
        }

        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            _logger.LogInformation("ReadList. 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;
        }

        public OrderViewModel? ReadElement(OrderSearchModel? model)
        {
            if(model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _orderStorage.GetElement(model);
            if(element == null)
            {
                _logger.LogError("ReadElement. Элемент не найден");
                return null;
            }
            _logger.LogInformation("ReadElement. Id:{id}", element.Id);
            return element;
        }

        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            model.Status = OrderStatus.Принят;
            var order = _orderStorage.Insert(model);
            if (order == null)
            {
                _logger.LogInformation("Create operation failed");
                return false;
            }

            var clientView = _clientStorage.GetElement(new() { Id = order.ClientId });
            SendMail(clientView, order);

            return true;
        }

        public bool DeliveryOrder(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Выдан);
        }

        public bool FinishOrder(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Готов);
        }

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

        private bool StatusUpdate(OrderBindingModel model, OrderStatus newStatus)
        {
            var element = _orderStorage.GetElement(new OrderSearchModel
            {
                Id = model.Id
            });
            if (element == null) return false;
            if (element.ImplementerId.HasValue) model.ImplementerId = element.ImplementerId;
            if (element.Status + 1 != newStatus)
            {
                _logger.LogInformation("Status update operation failed. Incorrect order status");
                return false;
            }
            model.Status = newStatus;
            if (model.Status == OrderStatus.Выдан)
            {
                model.DateImplement = DateTime.Now;
            }
            if (_orderStorage.Update(model) == null)
            {
                model.Status--;
                _logger.LogWarning("Update operation failed");
                return false;
            }

            element.Status = newStatus;

            var clientView = _clientStorage.GetElement(new() { Id = element.ClientId });
            SendMail(clientView, element);

            return true;
        }

        private void CheckModel(OrderBindingModel model)
        {
            if(model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if(model.Id < 0)
            {
                throw new ArgumentNullException("Некорректный номер заказа", nameof(model.Id));
            }
            if (model.Count < 1)
            {
                throw new ArgumentNullException("Количество изделий в заказе должно быть больше 0", nameof(model.Count));
            }
            if(model.Sum < 1)
            {
                throw new ArgumentNullException("Сумма заказа должна быть больше 0", nameof(model.Sum));
            }
            _logger.LogInformation("Order. Id:{Id}. Sum:{Sum}. Count:{Count}", model.Id, model.Sum, model.Count);
        }

        private void SendMail(ClientViewModel clientModel, OrderViewModel orderModel)
        {
            if(clientModel == null || orderModel == null)
            {
                return;
            }

            MailSendInfoBindingModel mailModel;

            if(orderModel.Status == OrderStatus.Принят)
            {
                mailModel = new MailSendInfoBindingModel
                {
                    MailAddress = clientModel.Email,
                    Subject = $"Заказ №{orderModel.Id}",
                    Text = $"Ваш заказ №{orderModel.Id} на сумму {orderModel.Sum} был принят"
                };
            }
            else
            {
                mailModel = new MailSendInfoBindingModel
                {
                    MailAddress = clientModel.Email,
                    Subject = $"Заказ №{orderModel.Id}",
                    Text = $"Статус заказа №{orderModel.Id} был изменен на {orderModel.Status}"
                };
            }
            _mailLogic.MailSendAsync(mailModel);
        }
    }
}