using FlowerShopContracts.BindingModels;
using FlowerShopContracts.BusinessLogicsContracts;
using FlowerShopContracts.SearchModels;
using FlowerShopContracts.StoragesContracts;
using FlowerShopContracts.ViewModels;
using FlowerShopDataModels.Enums;
using Microsoft.Extensions.Logging;

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

            _logger.LogInformation("ReadElement. Id:{ Id}", 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 bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);

            if (model.Status != OrderStatus.Неизвестен)
            {
                _logger.LogWarning("Invalid order status");
                return false;
            }

            model.Status = OrderStatus.Принят;

            if (_orderStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }

            return true;
        }

        public bool TakeOrderInWork(OrderBindingModel model)
        {
            CheckModel(model, false);

            if (_orderStorage.GetElement(new OrderSearchModel { Id=model.Id })?.Status != OrderStatus.Принят)
            {
                _logger.LogWarning("Invalid order status");
                return false;
            }

            model.Status = OrderStatus.Выполняется;

            if (!model.ImplementerId.HasValue)
            {
                _logger.LogWarning("There must be implementer to take order in work");
                return false;
            }

            if (_orderStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
            }

            return true;
        }
        public bool FinishOrder(OrderBindingModel model)
        {
            CheckModel(model, false);

            if (_orderStorage.GetElement(new OrderSearchModel { Id = model.Id })?.Status != OrderStatus.Выполняется)
            {
                _logger.LogWarning("Invalid order status");
                return false;
            }

            model.Status = OrderStatus.Готов;
            model.DateImplement = DateTime.Now;

            if (_orderStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
            }

            return true;
        }

        public bool DeliveryOrder(OrderBindingModel model)
        {
            CheckModel(model, false);

            var order = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });

            if (order?.Status != OrderStatus.Готов)
            {
                _logger.LogWarning("Invalid order status");
                return false;
            }

            model.Status = OrderStatus.Выдан;
            model.DateImplement = order.DateImplement;

            if (_orderStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
            }

            return true;
        }

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

            if (!withParams)
            {
                return;
            }

            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Стоимость должна быть больше 0", nameof(model.Sum));
            }

            _logger.LogInformation("Order. Id: {Id}. Sum: {Sum}. BouquetId: {BouquetId}", model.Id, model.Sum, model.BouquetId);

            var element = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
            if (element != null && element.Id == model.Id)
            {
                throw new InvalidOperationException("Заказ с таким идентификатором уже есть");
            }
        }
    }
}