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

namespace VideoGameQuotes.Web.Services {
	public interface ISystemService {
		IEnumerable<GamingSystem> FindByNameOrAbbreviation(string name, string abbreviation);
		GamingSystem Save(GamingSystem system);
		GamingSystem FindById(int id);
		void Delete(int id);
		IEnumerable<Game> GetGamesForSystem(GamingSystem system);
	}

	public class SystemService : ISystemService {
		private readonly IRepository<GamingSystem> repository;
		private readonly IRepository<Game> gameRepository;

		public SystemService(IRepository<GamingSystem> repository, IRepository<Game> gameRepository) {
			this.repository = repository;
			this.gameRepository = gameRepository;
		}

		[UnitOfWork]
		public IEnumerable<GamingSystem> FindByNameOrAbbreviation(string name, string abbreviation) {
			return repository
				.Records
				.Where(system => system.Abbreviation == abbreviation || system.Name == name);
		}

		[UnitOfWork]
		public GamingSystem Save(GamingSystem system) {
			return repository.Save(system);
		}

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

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

		public IEnumerable<Game> GetGamesForSystem(GamingSystem system) {
			return gameRepository
				.Records
				.Where(game => game.Systems.Contains(system));
		}
	}
}