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

namespace VideoGameQuotes.Web.Services {
	public interface IAdministrationService {
		User SaveUser(User user);
		IEnumerable<Quote> GetFlaggedQuotes();
		User GetUser(int id);
		IEnumerable<User> GetAllUsers();
		IEnumerable<User> GetPagedUsers(int start, int end);
	}

	public class AdministrationService : IAdministrationService {
		private readonly IRepository<User> userRepository;
		private readonly IRepository<Quote> quoteRepository;

		public AdministrationService(IRepository<User> userRepository, IRepository<Quote> quoteRepository) {
			this.userRepository = userRepository;
			this.quoteRepository = quoteRepository;
		}

		[UnitOfWork]
		public User SaveUser(User user) {
			return userRepository.Save(user);
		}

		[UnitOfWork]
		public IEnumerable<Quote> GetFlaggedQuotes() {
			return quoteRepository.Records
				.Where(quote => quote.Flags.Any())
				.ToArray()
				.OrderByDescending(quote => quote.Flags.Count());
		}

		[UnitOfWork]
		public User GetUser(int id) {
			return userRepository.FindById(id);
		}

		[UnitOfWork]
		public IEnumerable<User> GetAllUsers() {
			return userRepository.Records;
		}

		[UnitOfWork]
		public IEnumerable<User> GetPagedUsers(int start, int end) {
			return userRepository
				.Records
				.OrderBy(user => user.Username)
				.ThenBy(user => user.IpAddress)
				.Skip(start - 1)
				.Take(end - start + 1);
		}
	}
}