class ContestingProject < ActiveRecord::Base
  attr_accessible :contest_id, :description, :project_id, :user_id, :reward
  
  belongs_to :contest
  belongs_to :project
  belongs_to :user
  
  DESCRIPTION_LENGTH_LIMIT = 500
  validates :description, length: {maximum:DESCRIPTION_LENGTH_LIMIT }
  validates :user_id,      presence: true
  validates :contest_id,  presence: true, uniqueness: {scope: :project_id}
  validates :project_id,  presence: true

  validate :validate_user
  validate :validate_contest
  validate :validate_project
  
  def self.create_contesting(contest_id, project_id, description = nil)
    self.create(:user_id => User.current.id, :contest_id => contest_id,
                    :project_id => project_id, :description => description)
  end
   
  
  def update_reward(which)
    self.update_attribute(:reward,which)
  end
  
  def get_reward
    self.reward
  end
  
  def cancel_contesting
    unless self.nil?
      if User.current.id == self.user_id
        self.destroy  
      end   
    end   
  end
  
  private
  
  def validate_user
    errors.add :user_id, :invalid if user.nil? || !user.active?
  end
  
  def validate_contest
    errors.add :contest_id, :invalid if contest.nil?
  end
  
  def validate_project
    errors.add :project_id, :invalid if project.nil?
  end
end