Module: Schedulable::ActsAsSchedulable::ClassMethods

Defined in:
lib/schedulable/acts_as_schedulable.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_schedulable(name, options = {}) ⇒ Object 



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# File 'lib/schedulable/acts_as_schedulable.rb', line 12

def acts_as_schedulable(name, options = {})
  
  name||= :schedule
  attribute = :date
  
  has_one name, as: :schedulable, dependent: :destroy
  accepts_nested_attributes_for name
  
  if options[:occurrences]
    
    # setup association
    if options[:occurrences].is_a?(String) || options[:occurrences].is_a?(Symbol)
      occurrences_association = options[:occurrences].to_sym
      options[:occurrences] = {}
    else
      occurrences_association = options[:occurrences][:name]
      options[:occurrences].delete(:name)
    end
    options[:occurrences][:class_name] = occurrences_association.to_s.classify
    options[:occurrences][:as]||= :schedulable
    options[:occurrences][:dependent]||:destroy
    options[:occurrences][:autosave]||= true
    
    has_many occurrences_association, options[:occurrences]
    
    # table_name
    occurrences_table_name = occurrences_association.to_s.tableize
    
    # remaining
    remaining_occurrences_options = options[:occurrences].clone
    remaining_occurrences_association = ("remaining_" << occurrences_association.to_s).to_sym
    has_many remaining_occurrences_association, -> { where("#{occurrences_table_name}.date >= ?", Time.now).order('date ASC') }, remaining_occurrences_options
    
    # previous
    previous_occurrences_options = options[:occurrences].clone
    previous_occurrences_association = ("previous_" << occurrences_association.to_s).to_sym
    has_many previous_occurrences_association, -> { where("#{occurrences_table_name}.date < ?", Time.now).order('date DESC')}, previous_occurrences_options
    
    ActsAsSchedulable.add_occurrences_association(self, occurrences_association)
    
    after_save "build_#{occurrences_association}"
 
    self.class.instance_eval do
      define_method("build_#{occurrences_association}") do 
        # build occurrences for all events
        # TODO: only invalid events
        schedulables = self.all
        schedulables.each do |schedulable| 
          schedulable.send("build_#{occurrences_association}")
        end
      end
    end
  
    define_method "build_#{occurrences_association}_after_update" do 
      schedule = self.send(name)
      if schedule.changes.any?
        self.send("build_#{occurrences_association}")
      end
    end
  
    define_method "build_#{occurrences_association}" do 
      
      # build occurrences for events
      
      schedule = self.send(name)
      
      now = Time.now
      
      # TODO: Make configurable 
      occurrence_attribute = :date 
      
      schedulable = schedule.schedulable
      terminating = schedule.rule != 'singular' && (schedule.until.present? || schedule.count.present? && schedule.count > 1)
      
      max_period = Schedulable.config.max_build_period || 1.year
      max_date = now + max_period
      
      max_date = terminating ? [max_date, schedule.last.to_time].min : max_date
      
      max_count = Schedulable.config.max_build_count || 100
      max_count = terminating && schedule.remaining_occurrences.any? ? [max_count, schedule.remaining_occurrences.count].min : max_count

      if schedule.rule != 'singular'
        # Get schedule occurrences
        all_occurrences = schedule.occurrences_between(Time.now, max_date.to_time)
        occurrences = []
        # Filter valid dates
        all_occurrences.each_with_index do |occurrence_date, index|
          if occurrence_date.present? && occurrence_date.to_time > now
            if occurrence_date.to_time < max_date && index < max_count
              occurrences << occurrence_date
            else
              max_date = [max_date, occurrence_date].min
            end
          end
        end
      else
        # Get Singular occurrence
        d = schedule.date
        t = schedule.time
        dt = d + t.seconds_since_midnight.seconds   
        singular_date_time = (d + t.seconds_since_midnight.seconds).to_datetime
        occurrences = [singular_date_time]
      end

      # Build occurrences
      update_mode = Schedulable.config.update_mode || :datetime
      
      # Always use index as base for singular events
      if schedule.rule == 'singular'
        update_mode = :index
      end
      
      # Get existing remaining records
      occurrences_records = schedulable.send("remaining_#{occurrences_association}")

      # build occurrences
      existing_record = nil
      occurrences.each_with_index do |occurrence, index|
        
        # Pull an existing record
        if update_mode == :index
          existing_records = [occurrences_records[index]]
        elsif update_mode == :datetime
          existing_records = occurrences_records.select { |record|
            record.date.to_datetime == occurrence.to_datetime
          }
        else
          existing_records = []
        end

        if existing_records.any?
          # Overwrite existing records
          existing_records.each do |existing_record|
            if !occurrences_records.update(existing_record.id, date: occurrence.to_datetime)
              puts 'An error occurred while saving an existing occurrence record'
            end
          end
        else
          # Create new record
          if !occurrences_records.create(date: occurrence.to_datetime)
            puts 'An error occurred while creating an occurrence record'
          end
        end
      end
      
      
      # Clean up unused remaining occurrences 
      occurrences_records = schedulable.send("remaining_#{occurrences_association}")
      record_count = 0
      occurrences_records.each do |occurrence_record|
        if occurrence_record.date > now
          # Destroy occurrence if date or count lies beyond range
          if schedule.rule != 'singular' && (!schedule.occurs_on?(occurrence_record.date.to_date) || !schedule.occurring_at?(occurrence_record.date.to_time) || occurrence_record.date > max_date) || schedule.rule == 'singular' && record_count > 0
            occurrences_records.destroy(occurrence_record)
          end
          record_count = record_count + 1
        end
      end
      
    end
    
  end
end