using System.Linq;
using JetBrains.Annotations;
using Portoa.Persistence;
using VideoGameQuotes.Api;

namespace VideoGameQuotes.Web.Services {
	public interface ICategoryService {
		[CanBeNull]
		Category FindByName(string name);
		Category Save(Category category);
		Category FindById(int id);
		void Delete(int id);
		int GetQuotesForCategory(Category category);
	}

	public class CategoryService : ICategoryService {
		private readonly IRepository<Category> categoryRepository;
		private readonly IRepository<Quote> quoteRepository;

		public CategoryService(IRepository<Category> categoryRepository, IRepository<Quote> quoteRepository) {
			this.categoryRepository = categoryRepository;
			this.quoteRepository = quoteRepository;
		}

		[UnitOfWork]
		public Category FindByName(string name) {
			return categoryRepository.Records.FirstOrDefault(category => category.Name == name);
		}

		[UnitOfWork]
		public Category Save(Category category) {
			return categoryRepository.Save(category);
		}

		[UnitOfWork]
		public Category FindById(int id) {
			return categoryRepository.FindById(id);
		}

		[UnitOfWork]
		public void Delete(int id) {
			categoryRepository.Delete(id);
		}

		[UnitOfWork]
		public int GetQuotesForCategory(Category category) {
			return quoteRepository
				.Records
				.Where(quote => quote.Categories.Contains(category))
				.Count();
		}
	}
}