class Decidim::Meetings::Admin::UpdateAgenda

def call
  return broadcast(:invalid) if @form.invalid?
  transaction do
    update_agenda!
    update_agenda_items
  end
  broadcast(:ok, @agenda)
end

def initialize(form, agenda)
  @form = form
  @agenda = agenda
end

def update_agenda!
  Decidim.traceability.update!(
    @agenda,
    form.current_user,
    title: form.title,
    visible: form.visible
  )
end

def update_agenda_item(form_agenda_item)
  agenda_item_attributes = {
    title: form_agenda_item.title,
    description: form_agenda_item.description,
    position: form_agenda_item.position,
    duration: form_agenda_item.duration,
    parent_id: form_agenda_item.parent_id
  }
  update_nested_model(form_agenda_item, agenda_item_attributes, @agenda.agenda_items) do |agenda_item|
    form_agenda_item.agenda_item_children.each do |form_agenda_item_child|
      agenda_item_child_attributes = {
        title: form_agenda_item_child.title,
        description: form_agenda_item_child.description,
        position: form_agenda_item_child.position,
        duration: form_agenda_item_child.duration,
        parent_id: agenda_item.id,
        agenda: @agenda
      }
      update_nested_model(form_agenda_item_child, agenda_item_child_attributes, agenda_item.agenda_item_children)
    end
  end
end

def update_agenda_items
  @form.agenda_items.each do |form_agenda_item|
    update_agenda_item(form_agenda_item)
  end
end

def update_nested_model(form, attributes, agenda_item_children)
  record = agenda_item_children.find_by(id: form.id) || agenda_item_children.build(attributes)
  yield record if block_given?
  if record.persisted?
    if form.deleted?
      record.destroy!
    else
      record.update!(attributes)
    end
  else
    record.save!
  end
end