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using System;
using System.Threading.Tasks;
using AutoMapper;
using DevHive.Data.Models;
using DevHive.Data.Repositories;
using DevHive.Services.Models.Identity.User;
using DevHive.Services.Options;
namespace DevHive.Services.Services
{
public class FriendsService
{
private readonly FriendsRepository _friendsRepository;
private readonly IMapper _friendsMapper;
public FriendsService(FriendsRepository friendsRepository, IMapper mapper)
{
this._friendsRepository = friendsRepository;
this._friendsMapper = mapper;
}
//Create
public async Task<bool> AddFriend(Guid userId, Guid friendId)
{
User user = await this._friendsRepository.GetByIdAsync(userId);
User friend = await this._friendsRepository.GetByIdAsync(friendId);
if (DoesUserHaveThisFriend(user, friend))
throw new ArgumentException("Friend already exists in your friends list.");
return user != default(User) && friend != default(User) ?
await this._friendsRepository.AddFriendAsync(user, friend) :
throw new ArgumentException("Invalid user!");
}
//Read
public async Task<UserServiceModel> GetFriendById(Guid friendId)
{
if(!_friendsRepository.DoesUserExist(friendId))
throw new ArgumentException("User does not exist!");
User friend = await this._friendsRepository.GetByIdAsync(friendId);
return this._friendsMapper.Map<UserServiceModel>(friend);
}
public async Task<bool> RemoveFriend(Guid userId, Guid friendId)
{
if(!this._friendsRepository.DoesUserExist(userId) &&
!this._friendsRepository.DoesUserExist(friendId))
throw new ArgumentException("Invalid user!");
User user = await this._friendsRepository.GetByIdAsync(userId);
User friend = await this._friendsRepository.GetByIdAsync(friendId);
if(!this.DoesUserHaveFriends(user))
throw new ArgumentException("User does not have any friends.");
if (!DoesUserHaveThisFriend(user, friend))
throw new ArgumentException("This ain't your friend, amigo.");
return await this.RemoveFriend(user.Id, friendId);
}
//Validation
private bool DoesUserHaveThisFriend(User user, User friend)
{
return user.Friends.Contains(friend);
}
private bool DoesUserHaveFriends(User user)
{
return user.Friends.Count >= 1;
}
}
}
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