using ConfectioneryContracts.BindingModels;
using ConfectioneryBusinessLogic.MailWorker;
using ConfectioneryContracts.BusinessLogicsContracts;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContracts;
using ConfectioneryContracts.ViewModels;
using ConfectioneryDataModels.Enums;
using Microsoft.Extensions.Logging;
namespace ConfectioneryBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly AbstractMailWorker _mailWorker;
        private readonly IClientLogic _clientLogic;
        static readonly object locker = new object();
        public OrderLogic(ILogger<OrderLogic> logger, 
            IOrderStorage orderStorage, AbstractMailWorker mailWorker, 
            IClientLogic clientLogic)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _mailWorker = mailWorker;
            _clientLogic = clientLogic;
        }
        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 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 bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            if (model.Status != OrderStatus.Неизвестен) return false;
            model.Status = OrderStatus.Принят;
            var res = _orderStorage.Insert(model);
            if (res == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            SendOrderStatusMail(model.ClientId, 
                $"Изменен статус заказа #{res.Id}", $"Заказ #{res.Id} " +
                $"изменен статус на {model.Status}");
            return true;
        }
        public bool ChangeStatus(OrderBindingModel model, OrderStatus status)
        {
            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 != status - 1)
            {
                _logger.LogWarning("Status change operation failed");
                throw new InvalidOperationException("Текущий статус заказа" +
                    " не может быть переведен в выбранный");
            }
            model.Status = status;
            if (model.Status == OrderStatus.Выдан) 
                model.DateImplement = DateTime.Now;
            if (element.ImplementerId.HasValue) model.ImplementerId 
                    = element.ImplementerId;
            var result = _orderStorage.Update(model);
            if (result == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            SendOrderStatusMail(result.ClientId, 
                $"Изменен статус заказа #{result.Id}", $"Заказ #{model.Id} " +
                $"изменен статус на {result.Status}");
            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 заказа должна быть больше 0", nameof(model.Sum));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException(
                    "Количество элементов в заказе должно быть больше 0", 
                    nameof(model.Count));
            }
            _logger.LogInformation("Order. Sum:{ Cost}. Id: { Id}",
                model.Sum, model.Id);
        }
        private bool SendOrderStatusMail(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;
        }
    }
}