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

namespace ElectronicsShopBusinessLogic.BusinessLogic
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _storage;

        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage storage) { 
            _logger = logger;
            _storage = storage;
        }
        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            model.Status = OrderStatus.Принят;
            if (_storage.Insert(model) == null) {
                _logger.LogInformation("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 bool TakeOrderInWork(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Выполняется);
        }

        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            _logger.LogInformation($"ReadList:ID:{model?.ID}");
            var list = model ==  null ? _storage.GetFullList() : _storage.GetFilteredList(model); ;
            if (list == null) {
                _logger.LogWarning("ReadList return null list");
                return null;    
            }
            _logger.LogInformation($"ReadList.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 (string.IsNullOrEmpty((model.ID).ToString())) { 
                throw new ArgumentNullException("Нет ID заказа", nameof(model.ID));
            }
            if (model.Sum <= 0) {
                throw new ArgumentNullException("Цена зака должна быть больше 0", nameof(model.Sum));
            }
            _logger.LogInformation($"Order. ID:{model.ID}.Sum:{model.Sum}.Status:{model.Status}.PaymeantOption:{model.PaymeantOption}." +
                                    $"DateCreate:{model.DateCreate}.DataImplement:{model.DateImplement}");
        }
        private bool StatusUpdate(OrderBindingModel model, OrderStatus newOrderStatus)
        {
            CheckModel(model, false);
            var viewModel = _storage.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 (_storage.Update(model) == null) {
                _logger.LogWarning("Update operarion failed");
                return false;
            }
            return true;
        }
    }
}