ArticleService.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using ScientificReport.BLL.Interfaces;
using ScientificReport.DAL.DbContext;
using ScientificReport.DAL.Entities.Publications;
using ScientificReport.DAL.Entities.UserProfile;
using ScientificReport.DAL.Repositories;

namespace ScientificReport.BLL.Services
{
    public class ArticleService : IArticleService
    {
        private readonly ArticleRepository _articleRepository;

        public ArticleService(ScientificReportDbContext context)
        {
            _articleRepository = new ArticleRepository(context);
        }

        public virtual IEnumerable<Article> GetPage(int page, int count)
        {
            return _articleRepository.All().Skip((page - 1) * count).Take(count).ToList();
        }

        public virtual int GetCount()
        {
            return _articleRepository.All().Count();
        }

        public virtual IEnumerable<Article> GetAll()
        {
            return _articleRepository.All();
        }

        public virtual IEnumerable<Article> GetAllWhere(Func<Article, bool> predicate)
        {
            return GetAll().Where(predicate);
        }

        public virtual Article GetById(Guid id)
        {
            return _articleRepository.Get(id);
        }

        public virtual Article Get(Func<Article, bool> predicate)
        {
            return _articleRepository.Get(predicate);
        }

        public virtual void CreateItem(Article article)
        {
            _articleRepository.Create(article);
        }

        public virtual void UpdateItem(Article article)
        {
            _articleRepository.Update(article);
        }

        public virtual void DeleteById(Guid id)
        {
            _articleRepository.Delete(id);
        }

        public virtual bool Exists(Guid id)
        {
            return _articleRepository.Get(id) != null;
        }

        public virtual void AddAuthor(Article article, UserProfile user)
        {
            article.UserProfilesArticles.Add(new UserProfilesArticles
            {
                Article = article,
                Author = user,
                ArticleId = article.Id,
                AuthorId = user.Id
            });
            _articleRepository.Update(article);
        }
        
        public virtual void RemoveAuthor(Article article, UserProfile user)
        {
            article.UserProfilesArticles.Remove(article.UserProfilesArticles.First(up => up.Author.Id == user.Id));
            _articleRepository.Update(article);
        }
        
        public virtual IEnumerable<UserProfile> GetAuthors(Guid id)
        {
            var article = _articleRepository.Get(id);
            IEnumerable<UserProfile> authors = null;
            if (article != null)
            {
                authors = article.UserProfilesArticles.Select(u => u.Author);
            }

            return authors;
        }
    }
}