# Schedule model is the application representation of Bacula's Schedule.
# It has references to a host and multiple schedule run in order to provide
# the desired Bacula configuration
class Schedule < ActiveRecord::Base
  has_many :schedule_runs

  belongs_to :host
  has_many :job_templates

  validates :name, presence: true
  validates :name, uniqueness: { scope: :host }
  validates_with NameValidator

  accepts_nested_attributes_for :schedule_runs, allow_destroy: true

  # Constructs an array where each element is a line for the Schedule's bacula config
  #
  # @return [Array]
  def to_bacula_config_array
    ['Schedule {'] +
      ["  Name = \"#{name_for_config}\""] +
      schedule_runs.map {|r| "  Run = #{r.schedule_line}" } +
      ['}']
  end

  # Generates a name that will be used for the configuration file.
  # It is the name that will be sent to Bacula through the configuration
  # files.
  #
  # @return [String]
  def name_for_config
    [host.name, name].join(' ')
  end

  # Returns the hosts that have enabled jobs that use this schedule
  #
  # @return [ActiveRecord::Colletion] the participating hosts
  def participating_hosts
    Host.joins(:job_templates).where(job_templates: { enabled: true, schedule_id: id }).uniq
  end
end