using ConfectioneryBusinessLogic.MailWorker;
using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.BussinessLogicsContracts;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContracts;
using ConfectioneryContracts.ViewModels;
using ConfectioneryDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConfectioneryBusinessLogic
{
    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();

        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. OrderId:{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));
            }
            _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)
                return false;
            model.Status = OrderStatus.Принят;
            var resultIn = _orderStorage.Insert(model);
            if (resultIn == null)
            {
                model.Status = OrderStatus.Неизвестен;
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            SendOrderStatusMail(resultIn.ClientId, $"Новый заказ создан. Номер заказа #{resultIn.Id}", $"Заказ #{resultIn.Id} от {resultIn.DateCreate} на сумму {resultIn.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 bool ChangeStatus(OrderBindingModel model, OrderStatus requiredStatus)
        {
            CheckModel(model, false);
            var order = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
            if (order == null)
            {
                _logger.LogWarning("Change status operation failed. Order not found");
                return false;
            }
            if (order.Status + 1 != requiredStatus)
            {
                _logger.LogWarning("Change status operation failed. Incorrect new status: {newStatus}. Current status: {currStatus}",
                    requiredStatus, order.Status);
                return false;
            }
            model.Status = requiredStatus;
            if (order.ImplementerId.HasValue)
            {
                model.ImplementerId = order.ImplementerId;
            }
            if (model.Status == OrderStatus.Готов)
            {
                model.DateImplement = DateTime.Now;
            }
            else
            {
                model.DateImplement = order.DateImplement;
            }
            var resultUp = _orderStorage.Update(model);
            if (resultUp == null)
            {
                _logger.LogWarning("Change status operation failed");
                return false;
            }
            SendOrderStatusMail(resultUp.ClientId, $"Изменен статус заказа #{resultUp.Id}", $"Заказ #{model.Id} изменен статус на {resultUp.Status}");
            return true;
        }

        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.ClientId <= 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор клиента", nameof(model.ClientId));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Количество изделий должно быть больше 0", nameof(model.Count));
            }
            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Цена заказа должна быть больше 0", nameof(model.Sum));
            }
            if (model.DateImplement.HasValue && model.DateImplement < model.DateCreate)
            {
                throw new ArithmeticException($"Дата выдачи заказа {model.DateImplement} должна быть позже даты его создания {model.DateCreate}");
            }
            _logger.LogInformation("Pastry. PastryId:{PastryId}.Count:{Count}.Sum:{Sum}Id:{Id}", model.PastryId, model.Count, 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;
        }
    }
}