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

namespace VideoGameQuotes.Web.Services {
	public interface IGameService {
		[CanBeNull]
		Game FindByNameAndSystems(string name, IEnumerable<int> systemIds);
		Game Save(Game game);
		Game FindById(int id);
		void Delete(int id);
		int GetQuotesForGame(Game game);
	}

	public class GameService : IGameService {
		private readonly IRepository<Game> repository;
		private readonly IRepository<Quote> quoteRepository;

		public GameService(IRepository<Game> repository, IRepository<Quote> quoteRepository) {
			this.repository = repository;
			this.quoteRepository = quoteRepository;
		}

		[UnitOfWork]
		public Game FindByNameAndSystems(string name, IEnumerable<int> systemIds) {
			return repository
				.Records
				.FirstOrDefault(game => game.Name == name && game.Systems.Any(system => systemIds.Contains(system.Id)));
		}

		[UnitOfWork]
		public Game Save(Game game) {
			return repository.Save(game);
		}

		[UnitOfWork]
		public Game FindById(int id) {
			return repository.FindById(id);
		}

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

		[UnitOfWork]
		public int GetQuotesForGame(Game game) {
			return quoteRepository
				.Records
				.Where(quote => quote.Game == game)
				.Count();
		}
	}
}