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

namespace GiftShopBusinessLogic.BusinessLogics
{
    public class GiftLogic: IGiftLogic
    {
        private readonly ILogger _logger;

        private readonly IGiftStorage _giftStorage;

        public GiftLogic(ILogger<GiftLogic> logger, IGiftStorage giftStorage)
        {
            _logger = logger;
            _giftStorage = giftStorage;
        }

        public bool Create(GiftBindingModel model)
        {
            CheckModel(model);

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

            return true;
        }

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

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

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

            return true;
        }

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

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

            var element = _giftStorage.GetElement(model);

            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }

            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);

            return element;
        }

        public List<GiftViewModel>? ReadList(GiftSearchModel? model)
        {
            _logger.LogInformation("ReadList. GiftName:{GiftName}.Id:{ Id}", model?.GiftName, model?.Id);

            var list = model == null ? _giftStorage.GetFullList() : _giftStorage.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(GiftBindingModel model)
        {
            CheckModel(model);

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

            return true;
        }

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

            if (!withParams)
            {
                return;
            }

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

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

            _logger.LogInformation("Gift. GiftName:{GiftName}.Price:{ Cost}. Id: { Id}", model.GiftName, model.Price, model.Id);

            var element = _giftStorage.GetElement(new GiftSearchModel
            {
                GiftName = model.GiftName
            });

            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Изделие с таким названием уже есть");
            }
        }
    }
}