using CanteenContracts.BindingModels;
using CanteenContracts.BusinessLogicsContracts;
using CanteenContracts.SearchModel;
using CanteenContracts.StoragesContracts;
using CanteenContracts.View;
using CanteenDataModels.Models;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace CanteenBusinessLogic.BusinessLogics
{
    public class DishLogic : IDishLogic
    {
        private readonly ILogger _logger;
        private readonly IDishStorage _dishStorage;

        public DishLogic(ILogger<DishLogic> logger, IDishStorage dishStorage)
        {
            _logger = logger;
            _dishStorage = dishStorage;
        }

        public List<DishViewModel>? ReadList(DishSearchModel? model)
        {
            _logger.LogInformation("ReadList. DishName: {DishName}. Id: {Id}", model?.DishName, model?.Id);

            var list = model == null ? _dishStorage.GetFullList() : _dishStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }

            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

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

            _logger.LogInformation("ReadElement. DishName: {DishName}. Id: {Id}", model.DishName, model.Id);

            var element = _dishStorage.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 Create(DishBindingModel model)
        {
            CheckModel(model);

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

            return true;
        }

        public bool Update(DishBindingModel model)
        {
            CheckModel(model);

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

            return true;
        }

        public bool Delete(DishBindingModel model)
        {
            CheckModel(model, false);

            _logger.LogInformation("Delete. Id: {Id}", model.Id);
            if (_dishStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }

            return true;
        }

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

            if (!withParams)
            {
                return;
            }

            if (string.IsNullOrEmpty(model.DishName))
            {
                throw new ArgumentNullException("Нет названия блюда", nameof(model.DishName));
            }

            if (model.ManagerId <= 0)
            {
                throw new ArgumentNullException("id менеджера должен быть больше 0", nameof(model.ManagerId));
            }

            _logger.LogInformation("Dish. DishName: {DishName}. Price: {Price}. ManagerId: {ManagerId}. Id: {Id}", model.DishName, model.Price, model.ManagerId, model.Id);

            var element = _dishStorage.GetElement(new DishSearchModel { DishName = model.DishName });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Блюдо с таким названием уже есть");
            }
        }

        public bool AddProductsToDish(DishBindingModel model, IProductModel product, int count)
        {
            var dish = _dishStorage.GetElement(new DishSearchModel { Id = model.Id});
            dish.DishProducts[product.Id] = (product, count);
            double allSum = 0;
            foreach (var dishProduct in dish.DishProducts)
            {
                IProductModel _product = dishProduct.Value.Item1;
                int _count = dishProduct.Value.Item2;
                allSum += _product.Price * _count;
            }
            if (_dishStorage.Update(new()
            {
                Id = dish.Id,
                DishName = dish.DishName,
                ManagerId = dish.ManagerId,
                DishProducts = dish.DishProducts,
                Price = allSum

            }) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }

            return true;
        }
    }
}