class Friendship
  include DataMapper::Resource

  property :id, Serial
  property :created_at, DateTime

  belongs_to :source, 'User', :key => true
  belongs_to :target, 'User', :key => true

  validates_presence_of :source
  validates_presence_of :target
end


class User
  include DataMapper::Resource

  property :id, Serial
  property :email, String, :required => true, :format => :email_address, :unique => true
  property :password, BCryptHash, :required => true
  property :avatar_url, String
  property :phone_number, BCryptHash, :unique => true
  property :created_at, DateTime

  has n, :friendships, :child_key => [ :source_id ]
  has n, :friends, self, :through => :friendships, :via => :target
  has n, :votes
  has n, :favorites
  has n, :memberships

  def polls_voted_on
    self.votes.map { |v| v.option.poll }
  end

  def polls_favorited
    self.favorites.map(&:poll)
  end
end

class Qurb < Sinatra::Application
  post '/users/:user_id/friendships' do
    friendship = Friendship.new(:source_id => params[:user_id], :target_id => params[:friend_id])
    if friendship.save
      {friendship: friendship}.to_json
    else
      {errors: friendship.errors.to_h}.to_json
    end
  end

  get '/user/:user_id/friendships' do
    user = User.first(:id => params[:user_id])
    if user
      {friends: user.friendships.to_h}.to_json
    else
      {errors: friendships.errors.to_h}.to_json
    end
  end
end