PIbd-31_COP6/BookDatabaseImplement/Implements/HistoryStorage.cs

using BookContract.BindingModels;
using BookContract.StorageContracts;
using BookContract.ViewModels;
using BookDatabaseImplement.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BookDatabaseImplement.Implements
{
    public class HistoryStorage : IHistoryStorage
    {
        private History CreateModel(HistoryBindingModel model, History history)
        {
            history.BookId = model.BookId;
            history.ReaderId = model.ReaderId;
            history.DateBorrowed = model.DateBorrowed;
            return history;
        }

        private HistoryViewModel CreateModel(History history)
        {
            return new HistoryViewModel
            {
                Id = history.Id,
                BookId = history.BookId,
                ReaderId = history.ReaderId,
                DateBorrowed = history.DateBorrowed
            };
        }

        public List<HistoryViewModel> GetFullList()
        {
            using var context = new BookLibraryDatabase();
            return context.Histories.ToList().Select(CreateModel).ToList();
        }

        public List<HistoryViewModel> GetHistoryByBookId(int bookId)
        {
            using var context = new BookLibraryDatabase();
            return context.Histories
                .Where(history => history.BookId == bookId)
                .ToList().Select(CreateModel).ToList();
        }

        public HistoryViewModel? GetElement(HistoryBindingModel model)
        {
            using var context = new BookLibraryDatabase();
            var history = context.Histories.FirstOrDefault(rec => rec.Id == model.Id);
            return history != null ? CreateModel(history) : null;
        }

        public void Insert(HistoryBindingModel model)
        {
            using var context = new BookLibraryDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                context.Histories.Add(CreateModel(model, new History()));
                context.SaveChanges();
                transaction.Commit();
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }

        public void Delete(HistoryBindingModel model)
        {
            using var context = new BookLibraryDatabase();
            var history = context.Histories.FirstOrDefault(rec => rec.Id == model.Id);
            if (history != null)
            {
                context.Histories.Remove(history);
                context.SaveChanges();
            }
            else
            {
                throw new Exception("Запись истории не найдена");
            }
        }
    }
}