require 'digest/md5'

class Key < ActiveRecord::Base
  belongs_to :user
  belongs_to :project

  attr_protected :user_id

  validates :title,
            presence: true,
            length: { within: 0..255 }

  validates :key,
            presence: true,
            format: { :with => /ssh-.{3} / },
            length: { within: 0..5000 }

  before_save :set_identifier
  before_validation :strip_white_space
  delegate :name, :email, to: :user, prefix: true
  validate :unique_key

  def strip_white_space
    self.key = self.key.strip unless self.key.blank?
  end

  def unique_key
    query = Key.where(key: key)
    query = query.where('(project_id IS NULL OR project_id = ?)', project_id) if project_id
    if (query.count > 0)
      errors.add :key, 'already exist.'
    end
  end

  def set_identifier
    if is_deploy_key
      self.identifier = "deploy_" + Digest::MD5.hexdigest(key)
    else
      self.identifier = "#{user.identifier}_#{Time.now.to_i}"
    end
  end

  def is_deploy_key
    true if project_id
  end

  # projects that has this key
  def projects
    if is_deploy_key
      [project]
    else
      user.projects
    end
  end

  def last_deploy?
    Key.where(identifier: identifier).count == 0
  end
end
# == Schema Information
#
# Table name: keys
#
#  id         :integer(4)      not null, primary key
#  user_id    :integer(4)
#  created_at :datetime        not null
#  updated_at :datetime        not null
#  key        :text
#  title      :string(255)
#  identifier :string(255)
#  project_id :integer(4)
#