using ComputerStoreContracts.BindingModels;
using ComputerStoreContracts.BusinessLogicContracts;
using ComputerStoreContracts.SearchModels;
using ComputerStoreContracts.StorageContracts;
using ComputerStoreContracts.ViewModels;
using ComputerStoreDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputerStoreBusinessLogic.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);
            if (model.Status != OrderStatus.Unknown)
            {
                _logger.LogWarning("Insert operation failed. Order status incorrect.");
                return false;
            }
            model.Status = OrderStatus.Accepted;
            if (_orderStorage.Insert(model) == null)
            {
                model.Status = OrderStatus.Unknown;
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

        public bool DeleteOrder (OrderBindingModel model)
        {
			CheckModel(model, false);
			_logger.LogInformation("Delete. ID:{ID}", model.ID);
			if (_orderStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}

        public bool UpdateOrder (OrderBindingModel model)
        {
            CheckModel(model);
			if (_orderStorage.Update(model) == null)
            {
				_logger.LogWarning("Update operation failed");
				return false;
			}
            return true;
		}

        public bool StatusUpdate(OrderBindingModel rawModel, OrderStatus newStatus)
        {
            var viewModel = _orderStorage.GetElement(new OrderSearchModel
            {
                ID = rawModel.ID
            });

            if (viewModel == null)
            {
                _logger.LogWarning("Order model not found");
                return false;
            }

            OrderBindingModel model = new OrderBindingModel
            {
                ID = viewModel.ID,
                Status = viewModel.Status,
                DateCreate = viewModel.DateCreate,
                DateImplement = viewModel.DateImplement,
                Price = viewModel.Price,
                SellerID = viewModel.SellerID,
                OrderConsignments = viewModel.OrderConsignments,
                OrderRequests = viewModel.OrderRequests
            };

            CheckModel(model, false);
            if (model.Status + 1 != newStatus)
            {
                _logger.LogWarning("Status update to " + newStatus.ToString() + " operation failed. Order status incorrect.");
                return false;
            }
            model.Status = newStatus;
            if (model.Status == OrderStatus.Given) model.DateImplement = DateTime.Now;
            if (_orderStorage.Update(model) == null)
            {
                model.Status--;
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        public bool TakeOrderInProcess(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.InProcess);
        }

        public bool TakeOrderReady(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Ready);
        }

        public bool TakeOrderGiven(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Given);
        }

		public OrderViewModel? ReadElement(OrderSearchModel model)
        {
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			_logger.LogInformation("ReadElement. Order ID:{ OrderID}", 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("Order. 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.Price <= 0)
            {
                throw new ArgumentNullException("Incorrect Price", nameof(model.Price));
            }
            if (string.IsNullOrEmpty(model.SellerID.ToString()) && model.SellerID < 0)
            {
                throw new ArgumentNullException("Incorrect seller ID", nameof(model.SellerID));
            }
            _logger.LogInformation("Order. OrderID:{ ID}. SellerID: { SellerID}", model.ID, model.SellerID);
        }
    }
}