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

namespace BookShopBusinessLogic.BusinessLogics
{
    public class BookLogic : IBookLogic
    {
        private readonly ILogger _logger;
        private readonly IBookStorage _bookStorage;
        public BookLogic(ILogger<BookLogic> logger, IBookStorage bookStorage)
        {
            _logger = logger;
            _bookStorage = bookStorage;
        }
        public bool Create(BookBindingModel model)
        {
            CheckModel(model);
            if (_bookStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

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

        public BookViewModel? ReadElement(BookSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. BookName: {BookName}. Id: {Id}.", model.BookName, model.Id);
            var element = _bookStorage.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<BookViewModel>? ReadList(BookSearchModel? model)
        {
            _logger.LogInformation("ReadList. BookName: {BookName}. Id: {Id}.", model?.BookName, model?.Id);
            var list = model == null ? _bookStorage.GetFullList() : _bookStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

        public string TestInsertList(int num)
        {
            throw new NotImplementedException();
        }

        public string TestReadList(int num)
        {
            return _bookStorage.TestReadList(num);
        }
        public bool Update(BookBindingModel model)
        {
            CheckModel(model);
            if (_bookStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(BookBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.BookName))
            {
                throw new ArgumentNullException("Нет названия книги", nameof(model.BookName));
            }
            if (model.Count < 0)
            {
                throw new ArgumentNullException("Количество не может быть меньше 0", nameof(model.BookName));
            }
            if (model.Cost <= 0)
            {
                throw new ArgumentNullException("Стоимость не может быть меньше 0", nameof(model.BookName));
            }
            _logger.LogInformation("Book. BookName: {BookName}. Cost: {Cost}. Id: {Id}.", model.BookName, model.Cost, model.Id);
            var element = _bookStorage.GetElement(new BookSearchModel
            {
                BookName = model.BookName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Книга с таким названием уже есть");
            }
        }
    }
}