using CarRepairShopContracts.BindingModels;
using CarRepairShopContracts.BusinessLogicsContracts;
using CarRepairShopContracts.SearchModels;
using CarRepairShopContracts.StoragesContracts;
using CarRepairShopContracts.ViewModels;
using CarRepairShopDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CarRepairShopBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;

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

        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);
            model.Status = OrderStatus.Принят;
            if (_orderStorage.Insert(model) == null)
            {
                _logger.LogInformation("Create 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 bool TakeOrderInWork(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Выполняется);
        }

        private bool StatusUpdate(OrderBindingModel model, OrderStatus newStatus)
        {
            CheckModel(model);

            if(model.Status + 1 != newStatus)
            {
                _logger.LogInformation("Status update operation failed. Incorrect order status");
                return false;
            }
            model.Status = newStatus;
            if(model.Status == OrderStatus.Выдан)
            {
                model.DateImplement = DateTime.Now;
            }
            if(_orderStorage.Update(model) == null)
            {
                model.Status--;
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(OrderBindingModel model)
        {
            if(model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if(model.Id < 0)
            {
                throw new ArgumentNullException("Некорректный номер заказа", nameof(model.Id));
            }
            if (model.Count < 1)
            {
                throw new ArgumentNullException("Количество изделий в заказе должно быть больше 0", nameof(model.Count));
            }
            if(model.Sum < 1)
            {
                throw new ArgumentNullException("Сумма заказа должна быть больше 0", nameof(model.Sum));
            }
            _logger.LogInformation("Order. Id:{Id}. Sum:{Sum}. Count:{Count}", model.Id, model.Sum, model.Count);
        }
    }
}