ProjectLib/ProjectLibrary/Repositores/Implementations/ReaderRepository.cs

using ProjectLibrary.Entites;
using ProjectLibrary.Entities;
using ProjectLibrary.Repositories;
using System.Collections.Generic;
using System.Linq;

namespace ProjectLibrary.Repositories.Implementations
{
    public class ReaderRepository : IReaderRepository
    {
        private readonly List<Reader> _readers = new List<Reader>();

        public void CreateReader(Reader reader)
        {
            _readers.Add(reader);
        }

        public void DeleteReader(int id)
        {
            var reader = _readers.FirstOrDefault(r => r.Id == id);
            if (reader != null)
            {
                _readers.Remove(reader);
            }
        }

        public Reader ReadReaderById(int id)
        {
            return _readers.FirstOrDefault(r => r.Id == id) ?? Reader.CreateEntity(id, "Unknown Reader", 0, DateTime.Now);
        }

        public IEnumerable<Reader> ReadReaders()
        {
            return _readers;
        }

        public void UpdateReader(Reader reader)
        {
            var existingReader = _readers.FirstOrDefault(r => r.Id == reader.Id);
            if (existingReader != null)
            {
                _readers.Remove(existingReader);
                _readers.Add(reader);
            }
        }
    }
}