class Twilio::OneoffSmsCampaignService
  pattr_initialize [:campaign!]

  def perform
    raise "Invalid campaign #{campaign.id}" if campaign.inbox.inbox_type != 'Twilio SMS' || !campaign.one_off?
    raise 'Completed Campaign' if campaign.completed?

    # marks campaign completed so that other jobs won't pick it up
    campaign.completed!

    audience_label_ids = campaign.audience.select { |audience| audience['type'] == 'Label' }.pluck('id')
    audience_labels = campaign.account.labels.where(id: audience_label_ids).pluck(:title)
    process_audience(audience_labels)
  end

  private

  delegate :inbox, to: :campaign
  delegate :channel, to: :inbox

  def process_audience(audience_labels)
    campaign.account.contacts.tagged_with(audience_labels, any: true).each do |contact|
      next if contact.phone_number.blank?

      send_message(to: contact.phone_number, from: channel.phone_number, content: campaign.message)
    end
  end

  def send_message(to:, from:, content:)
    client.messages.create(body: content, from: from, to: to)
  end

  def client
    ::Twilio::REST::Client.new(channel.account_sid, channel.auth_token)
  end
end