epri-vtn_custom/app/models/ven.rb

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# == Schema Information
#
# Table name: vens
#
#  id                          :integer          not null, primary key
#  name                        :string(255)
#  email                       :string(255)
#  address                     :string(255)
#  state                       :string(255)
#  zip                         :string(255)
#  geospatial_location         :string(255)
#  grid_electrical_coordinates :string(255)
#  shed_capability             :float
#  ramp_period                 :integer
#  recovery_period             :integer
#  account_id                  :integer
#  created_at                  :datetime         not null
#  updated_at                  :datetime         not null
#  registration_id             :integer
#  ven_id                      :string(255)
#  common_name                 :string(255)
#  distribute_event_payload    :text
#  profile_id                  :integer
#  http_push                   :boolean
#  transport_address           :string(255)
#  last_comm_at                :datetime
#  time_zone                   :string(255)      default("UTC")
#  ven_interface_name          :string(255)
#  address_label               :string(255)
#  address_extra               :string(255)
#  city                        :string(255)
#

class Ven < ActiveRecord::Base

  attr_accessible :email, :geospatial_location, :grid_electrical_coordinates, :name, :ramp_period,
    :recovery_period, :shed_capability, :common_name, :profile_id, :transport_address,
    :address_label, :address, :address_extra, :city, :state, :zip,
    :http_push, :ven_id, :time_zone, :ven_interface_name

  attr_accessor :status

  scope :online, -> { where("last_comm_at >= ?", Time.now - 5.minutes) } 
  scope :offline, -> { where("last_comm_at < ? OR last_comm_at IS NULL", Time.now - 5.minutes) }

  before_create :generate_id

  belongs_to :account
  has_many :resources, :dependent => :destroy

  belongs_to :registration
  has_many :registrations, :dependent => :destroy

  belongs_to :profile

  has_many :ven_messages, :dependent => :destroy, order: 'created_at asc'

  has_many :reports, :dependent => :destroy
  has_many :report_interval_descriptions, through: :reports
  has_many :report_intervals, through: :reports

  has_many :opt_schedules, :dependent => :destroy

  has_many :create_reports, :dependent => :destroy

  

  validates :name, :presence => true, uniqueness: { case_sensitive: false }

  validates_uniqueness_of :common_name, :allow_nil => false, :allow_blank => false

  validates_presence_of :common_name

  validates_uniqueness_of :ven_id, :allow_nil => false, :allow_blank => false, :message => " ID already taken"

  validates_presence_of :ven_id, :on => :update

  # `:time_zone` database column has a default value of "UTC"
  validates :time_zone,
    presence: true,
    inclusion: { in: ActiveSupport::TimeZone.zones_map }

  validates :account_id, presence: true

  validates :distribute_event_payload, presence: true

  has_many :market_context_subscriptions, :dependent => :destroy
  has_many :market_contexts, through: :market_context_subscriptions

  has_many :ven_polls, order: "created_at DESC"

  has_many :event_vens

  # # # # # # # # # # # # # # # #
  # This method run `before_destroy` which depends on associated `:ven_targets` records
  # must be listed above `has_many :ven_targets, dependent: :destroy` to work properly
  before_destroy :destroy_associated_target_of_type_venid

  has_many :ven_targets, dependent: :destroy
  has_many :targets, through: :ven_targets

  has_many :events, conditions: "template = false or template is null", through: :targets, uniq: true

  after_create :create_and_associate_target_of_type_venid
  # The above method run `after_create` which depends on `:targets` association
  # must be listed below `has_many :targets, through: :ven_targets` to work properly
  # # # # # # # # # # # # # # # #

  # event assigned directly to a VEN
  has_many :ven_events, :dependent => :destroy, through: :event_vens, source: :event

  # all vens that have the given resource
  has_many :resource_events, through: :resources, source: :events, uniq: true

  # all vens for accounts in the group
  has_many :group_events, through: :account, source: :target_events, uniq: true
  # has_many :group_events, through: :account, source: :events, uniq: true

  # all vens with the specific party ID
  has_many :party_events, through: :market_context_subscriptions, source: :events, uniq: true

  before_validation :handle_distribute_event_payload_value

  # If additional strings are added to this array, be sure to add a
  # corresponding scope (relied upon in `Ven.search` method below)
  ACCEPTABLE_STATUS_STRINGS = ['online', 'offline']

  #####################################################################

  #after_initialize do |event|
  #  event.status = status
  #end

  #####################################################################

  def self.fields
    VENFields.new.fields
  end

  #####################################################################

  def sorted_events
    self.events.sort { |e1, e2| Event.compare(e1, e2) }
  end

  #####################################################################

  def generate_id
    self.ven_id = SecureRandom.hex(10)
  end

  #####################################################################

  def subscriptions
    MarketContext.select("market_contexts.name as name, market_context_subscriptions.party_name as party_name, market_contexts.id as market_context_id").joins("left join market_context_subscriptions on market_context_subscriptions.market_context_id = market_contexts.id and market_context_subscriptions.ven_id = #{self.id}")
  end

  #####################################################################

  def status
    last_poll = self.last_comm_at

    return "offline" if last_poll.nil?

    return "online" if (Time.now - last_poll) / 60 < 5

    "offline"
  end

  #####################################################################

  def view_registration_id
     return '(not registered)' if self.registration.nil?

     self.registration.registration_id
  end

  #####################################################################

  def queue_oadr_message(xml, service_type_name, replace)

    # don't queue messages for unregistered VENs
    return if self.registration.nil? and (self.http_push.nil? or self.http_push == false)

    service_type = ServiceType.find_by_name(service_type_name)

    if replace
      ven_message = self.ven_messages.find_by_service_type_id(service_type.id)
    end

    ven_message = self.ven_messages.new if ven_message.nil?
    ven_message.oadr_message = xml

    ven_message.service_type = service_type
    ven_message.save

  end

  #####################################################################

  def cancel_registration

    self.ven_messages.delete_all
    RegisterPartyService.new.queue_cancel_registration(self, self.registration)

  end

  #####################################################################

  def clear_registration

    self.ven_messages.delete_all
    self.registration = nil

    self.save
  end

    #####################################################################

  def reregister
    RegisterPartyService.new.queue_reregistration(self)
  end

  #####################################################################

  def self.find_by_ven_id_case_sensitive(ven_id)
    ven = Ven.find_by_ven_id(ven_id)

    return nil if ven.nil?

    return nil if ven.ven_id != ven_id

    ven
  end

  #####################################################################

  def self.search(search_params)

    strip_empty_values_and_params(search_params)

    if search_params.empty?
      return Ven.all
    end

    if search_params[:target_ids]
      target_ids = search_params[:target_ids].map(&:to_i)
    end

    if search_params[:search_string]
      search_string = search_params[:search_string]
    end

    if search_params[:status]
      status = search_params[:status]
    end

    collected_vens = []

    if target_ids.present?
      vens_by_target_ids = Ven.joins(:targets).where(targets: { id: target_ids })
      if collected_vens == []
        collected_vens += vens_by_target_ids
      else
        collected_vens &= vens_by_target_ids
      end
    end

    # Block skipped if non-acceptable status string is passed in
    if status.present? && ACCEPTABLE_STATUS_STRINGS.include?(status)

      vens_by_status = Ven.public_send(status)

      if collected_vens == []
        collected_vens += vens_by_status
      else
        collected_vens &= vens_by_status
      end
    end

    if search_string.present?
      vens_by_search_string = Ven.where(
        "address_label ILIKE ? OR address ILIKE ? OR address_extra ILIKE ? OR city ILIKE ? OR state ILIKE ? OR zip ILIKE ?",
        "%#{ search_string }%", "%#{ search_string }%", "%#{ search_string }%", "%#{ search_string }%", "%#{ search_string }%", "%#{ search_string }%"
      )
      if collected_vens == []
        collected_vens += vens_by_search_string
      else
        collected_vens &= vens_by_search_string
      end
    end

    return collected_vens
  end

  #####################################################################

  def self.strip_empty_values_and_params(search_params)
    # TODO: Improve this method with a bit of recursion (currently only "clears" one level of nesting)
    # TODO: Account for nested hashes (clearing of nested values only works for params with array values)
    search_params.each do |key, value|
      if value.class == Array
        # Remove any empty values ('' or []) from nested arrays
        value.reject! { |item| item.to_s.empty? } # Mutate array by removing empty elements
      end
    end

    # Remove any params whose values are empty ('' or [])
    search_params.delete_if { |key, value| value.empty? }
  end

  #####################################################################

  # queue up a distribute_event message if there are cancelled unacknowledged events
  def check_cancelled_events
    always = ResponseRequiredType.find_by_name('always')
    cancelled = EventStatus.find_by_name('cancelled')

    self.events.each do |event|
      if event.response_required_type_id == always.id and event.opt_state_name(self.id).nil? and event.event_status_id == cancelled.id

        EventService.new.queue_distribute_event([self])

        return true
      end
    end

    false
  end

  #####################################################################

  def generate_distribute_event_payload_value
    
    vtn_parameters = VtnParameter.first

    if profile_id == nil || profile_id == Profile.find_by_name('2.0b').id
      self.distribute_event_payload = CreateDistributeEvent.create_distribute_event_b(self, vtn_parameters)
    else
      self.distribute_event_payload = CreateDistributeEvent.create_distribute_event_a(self, vtn_parameters)
    end
  end

  #####################################################################
  private
  #####################################################################

  def create_and_associate_target_of_type_venid

    # Create a new `Target` record, and add it to `self.targets` collection.
    # Also creates requisite `VenTarget` record (based on `has_many: :through` association with :targets).
    created_target = targets.create(name: "VEN:#{ id }", type: Target::VEN_ID, tag: 'ven')
  end

  #####################################################################

  def destroy_associated_target_of_type_venid

    if !targets.empty?
      # Find associated `Target` object of type `venID`, and store it as a variable for later use
      vens_target_of_type_venid = targets.find_by_type(Target::VEN_ID)

      if vens_target_of_type_venid
        vens_target_id = vens_target_of_type_venid.id

        # Use `has_many :ven_targets` association to narrow search, then find correct `VenTarget`
        # record by its `:target_id`, which is validated unique within that scope
        targets_ven_target = ven_targets.find_by_target_id(vens_target_id)

        targets_ven_target.destroy
        # Reload the Target instance, since the in-memory version isn't "aware" that the formerly associated
        # Ven instance is no longer associated (VenTarget linking them was independently destroyed)
        vens_target_of_type_venid.reload
        vens_target_of_type_venid.destroy
      end
    end
  end

  #####################################################################

  def handle_distribute_event_payload_value

    # `.my_attribute_changed?` method is from `ActiveModel::Dirty` module, and returns
    # `true` if that attribute's value is changed (but not yet saved)
    if distribute_event_payload.nil? || profile_id_changed?
      generate_distribute_event_payload_value
    end
  end
end