using FurnitureAssemblyDataModels.Enums;
using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.BusinessLogicsContracts;
using FurnitureAssemblyContracts.SearchModels;
using FurnitureAssemblyContracts.StoragesContracts;
using FurnitureAssemblyContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using FurnitureAssemblyBusinessLogic.MailWorker;

namespace FurnitureAssemblyBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic 
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly AbstractMailWorker _mailWorker;
        private readonly IClientLogic _clientLogic;
        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IClientLogic clientLogic, AbstractMailWorker abstractMailWorker)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _clientLogic = clientLogic;
            _mailWorker = abstractMailWorker;
        }

        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            if (model.Status != OrderStatus.Неизвестен) return false;
            model.Status = OrderStatus.Принят;  
            var order = _orderStorage.Insert(model);
            if (order == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            SendMail(model.ClientId, $"Создание заказа {order.Id}", $"Заказ под номером {order.Id} создан {model.DateCreate}");
            return true;
        }

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

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

        public bool TakeOrderInWork(OrderBindingModel model)
        {
            return ChangeStatus(model, OrderStatus.Выполняется);
        }

        private bool ChangeStatus(OrderBindingModel model, OrderStatus newStatus)
        {
            var viewModel = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
            if (viewModel == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (viewModel.Status + 1 != newStatus)
            {
                _logger.LogWarning("Change status operation failed");
                throw new InvalidOperationException();
            }
            model.Status = newStatus;
            if (model.Status == OrderStatus.Готов)
            {
                model.DateImplement = DateTime.Now;
            }
            else
            {
                model.DateImplement = viewModel.DateImplement;
            }
            if (viewModel.ImplementerId.HasValue)
            {
                model.ImplementerId = viewModel.ImplementerId.Value;
            }
            CheckModel(model, false);
            var order = _orderStorage.Update(model);
            if (order == null)
            {
                _logger.LogWarning("Change status operation failed");
                return false;
            }
            SendMail(order.ClientId, $"Заказ №{order.Id}", $"Заказ №{order.Id} изменил статус на {order.Status}.");
            return true;
        }

        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;
        }

        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            if (!withParams)
            {
                return;
            }

            if (model.FurnitureId < 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор изделия", nameof(model.FurnitureId));
            }

            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}. PackageId: { PackageId}", model.Id, model.Sum, model.FurnitureId);
        }
        public OrderViewModel? ReadElement(OrderSearchModel? model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Status: {Status}. ImplementerId: {ImplementerId} Id:{ Id}", model.Status, model.ImplementerId, 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;
        }
        private bool SendMail(int clientId, string subject, string text)
        {
            var client = _clientLogic.ReadElement(new() { Id = clientId });
            if (client == null)
            {
                _logger.LogWarning("Email sending failed. Client with id {Id} not found", clientId);
                return false;
            }
            _mailWorker.MailSendAsync(new MailSendInfoBindingModel()
            {
                Subject = subject,
                Text = text,
                MailAddress = client.Email
            });
            return true;
        }
    }
}