# encoding: UTF-8
require 'object_builder'
require 'mauve/notification'
require 'mauve/configuration_builder'
require 'mauve/alert_group'
require 'mauve/notification'

module Mauve
  module ConfigurationBuilders
    #
    # This corresponds to a new "notify" clause an the alert_group config.
    #
    class Notification < ObjectBuilder

      # Sets up the notification
      # 
      # @param [String] who Username or people_list to notify
      # @raise [ArgumentError] if a username doesn't exist.
      #
      # @return [Mauve::Notification] New notification instance.
      def builder_setup(who)
        who = if who.is_a?(Mauve::Person) or who.is_a?(Mauve::PeopleList)
          who

        elsif @context.people[who]
          @context.people[who]

        elsif @context.people_lists[who]
          @context.people_lists[who]

        else
          raise ArgumentError.new("You have not declared who #{who} is")

        end

        @result = Mauve::Notification.new(who)
      end
      
      is_attribute "every"
      is_block_attribute "during"
    end

    # This corresponds to a new alert_group clause
    #
    class AlertGroup < ObjectBuilder

      # Sets up the alert group, and sets the last_alert_group context.
      # 
      # @param [String] name Name of the new alert group
      #
      # @return [Mauve::AlertGroup] New alert group instance
      def builder_setup(name="anonymous_name")
        @result = Mauve::AlertGroup.new(name)
      end

      is_block_attribute "includes"
      is_attribute "acknowledgement_time"
      is_attribute "level"
      is_builder "notify", Mauve::ConfigurationBuilders::Notification

      # Method called after the notify clause has been sorted.  Adds new
      # notification clause to the result.
      #
      # @param [Mauve::Notification] notification
      #
      def created_notify(notification)
        @result.notifications ||= []

        if notification.during.nil? and notification.every.nil?
          @result.notifications += notification.person.notifications.collect do |n|
            #
            # Set up a new notification for each one defined for this person.
            #
            new_notification = Mauve::Notification.new(notification.person)
            new_notification.level  = @result.level
            new_notification.every  = n.every
            new_notification.during = n.during
            new_notification
          end
        else
          #
          # Set the level for this notification
          #
          notification.level    = @result.level
          @result.notifications << notification
        end
      end

    end

  end

  # These constants define the levels available for alert groups.
  #
  # This should live in AlertGroup but can't due to
  # http://briancarper.net/blog/ruby-instance_eval_constant_scoping_broken
  #
  module AlertGroupConstants
    # Urgent level
    URGENT = :urgent
    # Normal level
    NORMAL = :normal
    # Low level
    LOW    = :low
  end


  class ConfigurationBuilder < ObjectBuilder

    include AlertGroupConstants

    is_builder "alert_group", ConfigurationBuilders::AlertGroup

    # Called after an alert group is created.  Checks to make sure that no more than one alert group shares a name.
    #
    # @param [Mauve::AlertGroup] alert_group The new AlertGroup
    # @raise [ArgumentError] if an AlertGroup with the same name already exists.
    #
    def created_alert_group(alert_group)
      name = alert_group.name
      raise ArgumentError.new("Duplicate alert_group '#{name}'") unless @result.alert_groups.select { |g| g.name == name }.empty?
      @result.alert_groups << alert_group
    end

  end

end