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

namespace FlowerShopBusinessLogic.BusinessLogic
{
    public class FlowerLogic : IFlowerLogic
    {
        private readonly ILogger _logger;
        private readonly IFlowerStorage _flowerStorage;
        public FlowerLogic(ILogger<FlowerLogic> logger, IFlowerStorage flowerStorage)
        {
            _logger = logger;
            _flowerStorage = flowerStorage;
        }
        public List<FlowerViewModel>? ReadList(FlowerSearchModel? model)
        {
            _logger.LogInformation("ReadList. FlowerName:{FlowerName}.Id:{ Id}", model?.FlowerName, model?.Id);
            var list = model == null ? _flowerStorage.GetFullList() : _flowerStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }
        public FlowerViewModel? ReadElement(FlowerSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. FlowerName:{FlowerName}.Id:{ Id}", model.FlowerName, model.Id);
            var element = _flowerStorage.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(FlowerBindingModel model)
        {
            CheckModel(model);
            if (_flowerStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(FlowerBindingModel model)
        {
            CheckModel(model);
            if (_flowerStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Delete(FlowerBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id:{Id}", model.Id);
            if (_flowerStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }
        private void CheckModel(FlowerBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.FlowerName))
            {
                throw new ArgumentNullException("Нет названия цветка", nameof(model.FlowerName));
            }
            if (model.Price <= 0)
            {
                throw new ArgumentNullException("Цена цветка должна быть больше 0", nameof(model.Price));
            }
            _logger.LogInformation("Flower. FlowerName:{FlowerName}.Cost:{ Cost}. Id: { Id}", model.FlowerName, model.Price, model.Id);
            var element = _flowerStorage.GetElement(new FlowerSearchModel
            {
                FlowerName = model.FlowerName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Компонент с таким названием уже есть");
            }
        }
    }
}