using DinerContracts.BindingModels;
using DinerContracts.BusinessLogicsContacts;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
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 SnackLogic : ISnackLogic
    {
        private readonly ILogger _logger;
        private readonly ISnackStorage _productStorage;

        public SnackLogic(ILogger<SnackLogic> logger, ISnackStorage productStorage) { 
            _logger = logger;
            _productStorage = productStorage;
        }

        public bool Create(SnackBindingModel model)
        {
            CheckModel(model);
            if (_productStorage.Insert(model) == null) {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

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

        public SnackViewModel? ReadElement(SnackSearchModel model)
        {
            if (model == null) throw new ArgumentNullException(nameof(model));
            _logger.LogInformation("ReadElement. ProductName:{ProductName}. ID:{ID}", model.ProductName, model.ID);
            var element = _productStorage.GetElement(model);
            if (element == null) {
                _logger.LogWarning("ReadElement. elementn not found");
                return null;
            }
            _logger.LogInformation("ReadElement find. ID:{ID}", element.ID);
            return element;
        }

        public List<SnackViewModel>? ReadList(SnackSearchModel? model)
        {
            _logger.LogInformation("ReadList. ProductName:{ProductName}. ID:{ID}", model?.ProductName, model?.ID);
            var list = model == null ? _productStorage.GetFullList() : _productStorage.GetFilteredList(model);
            if (list == null) {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

        public bool Update(SnackBindingModel model)
        {
            CheckModel(model);
            if (_productStorage.Update(model) == null) {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        
        private void CheckModel(SnackBindingModel model, bool withParams = true) { 
            if (model == null) throw new ArgumentNullException(nameof(model));
            if (!withParams) return;
            if (string.IsNullOrEmpty(model.ProductName))
                throw new ArgumentNullException("Нет названия продукта", nameof(model.ProductName));
            if (model.Price <= 0)
                throw new ArgumentNullException("Цена продукта должна быть больше 0", nameof(model.Price));
            _logger.LogInformation("Product. ProductName:{ProductName}. Price:{Price}. ID:{ID}",
                                    model.ProductName, model.Price, model.Price);
            var element = _productStorage.GetElement(new SnackSearchModel { ProductName = model.ProductName });
            if (element != null && element.ID != model.ID)
                throw new InvalidOperationException("Продукт с таким названием уже есть");
        }
    }
}