using DinerContracts.BindingModels;
using DinerContracts.BusinessLogicsContacts;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
using DinerDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DineryBusinessLogic.BusinessLogic
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;

        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage) { 
            _logger = logger;
            _orderStorage = orderStorage;
        }

        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            model.Status = OrderStatus.Принят;
            if (_orderStorage.Insert(model) == null) {
                model.Status = OrderStatus.Неизвестен;
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

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

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

        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 TakeOrderInWork(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Выполняется);
        }

        private void CheckModel(OrderBindingModel model, bool withParams = true) { 
            if (model == null) throw new ArgumentNullException(nameof(model));
            if (!withParams) return;
            if (string.IsNullOrEmpty((model.ID).ToString()))
                throw new ArgumentNullException("Нет ID заказа", nameof(model.ID));
            if (model.Sum <= 0)
                throw new ArgumentNullException("Цена заказа должна быть больше 0", nameof(model.Sum));
            _logger.LogInformation("Order. ProductID:{ProductID}. Count:{Count}. Sum:{Sum}. Status:{Status}. " +
                                    "DateCreate:{DateCreate}. DateImplement:{DateImplement}. ID:{ID}",
                                    model.ProductID, model.Count, model.Sum, model.Status, model.DateCreate, model.DateImplement, model.ID);
        }
        private bool StatusUpdate(OrderBindingModel model, OrderStatus newOrderStatus) {
            CheckModel(model, false);
            var viewModel = _orderStorage.GetElement(new OrderSearchModel { ID = model.ID });
            if (viewModel == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (viewModel.Status + 1 != newOrderStatus) {
                _logger.LogWarning("Status update to " + newOrderStatus.ToString() + " operation failed.");
                return false;
            }
            model.Status = newOrderStatus;
            if (model.Status == OrderStatus.Готов) {
                model.DateImplement = DateTime.Now;
            }
            else {
                model.DateImplement = viewModel.DateImplement;
            }
            if (_orderStorage.Update(model) == null) {
                _logger.LogWarning("Update operarion failed");
                return false;
            }
            return true;
        }
    }
}