Chatwoot/app/services/contacts/contactable_inboxes_service.rb

class Contacts::ContactableInboxesService
  pattr_initialize [:contact!]

  def get
    account = contact.account
    account.inboxes.filter_map { |inbox| get_contactable_inbox(inbox) }
  end

  private

  def get_contactable_inbox(inbox)
    case inbox.channel_type
    when 'Channel::TwilioSms'
      twilio_contactable_inbox(inbox)
    when 'Channel::Whatsapp'
      whatsapp_contactable_inbox(inbox)
    when 'Channel::Email'
      email_contactable_inbox(inbox)
    when 'Channel::Api'
      api_contactable_inbox(inbox)
    when 'Channel::WebWidget'
      website_contactable_inbox(inbox)
    end
  end

  def website_contactable_inbox(inbox)
    latest_contact_inbox = inbox.contact_inboxes.where(contact: @contact).last
    return unless latest_contact_inbox
    # FIXME : change this when multiple conversations comes in
    return if latest_contact_inbox.conversations.present?

    { source_id: latest_contact_inbox.source_id, inbox: inbox }
  end

  def api_contactable_inbox(inbox)
    latest_contact_inbox = inbox.contact_inboxes.where(contact: @contact).last
    source_id = latest_contact_inbox&.source_id || SecureRandom.uuid

    { source_id: source_id, inbox: inbox }
  end

  def email_contactable_inbox(inbox)
    return unless @contact.email

    { source_id: @contact.email, inbox: inbox }
  end

  def whatsapp_contactable_inbox(inbox)
    return unless @contact.phone_number

    # Remove the plus since thats the format 360 dialog uses
    { source_id: @contact.phone_number.delete('+'), inbox: inbox }
  end

  def twilio_contactable_inbox(inbox)
    return if @contact.phone_number.blank?

    case inbox.channel.medium
    when 'sms'
      { source_id: @contact.phone_number, inbox: inbox }
    when 'whatsapp'
      { source_id: "whatsapp:#{@contact.phone_number}", inbox: inbox }
    end
  end
end