assistant-storefront/app/helpers/api/v1/inboxes_helper.rb

module Api::V1::InboxesHelper
  def inbox_name(channel)
    return channel.try(:bot_name) if channel.is_a?(Channel::Telegram)

    permitted_params[:name]
  end

  def validate_email_channel(attributes)
    channel_data = permitted_params(attributes)[:channel]

    validate_imap(channel_data)
    validate_smtp(channel_data)
  end

  private

  def validate_imap(channel_data)
    return unless channel_data.key?('imap_enabled') && channel_data[:imap_enabled]

    Mail.defaults do
      retriever_method :imap, { address: channel_data[:imap_address],
                                port: channel_data[:imap_port],
                                user_name: channel_data[:imap_login],
                                password: channel_data[:imap_password],
                                enable_ssl: channel_data[:imap_enable_ssl] }
    end

    check_imap_connection(channel_data)
  end

  def validate_smtp(channel_data)
    return unless channel_data.key?('smtp_enabled') && channel_data[:smtp_enabled]

    smtp = Net::SMTP.new(channel_data[:smtp_address], channel_data[:smtp_port])

    set_smtp_encryption(channel_data, smtp)
    check_smtp_connection(channel_data, smtp)
  end

  def check_imap_connection(channel_data)
    Mail.connection {} # rubocop:disable:block
  rescue SocketError => e
    raise StandardError, I18n.t('errors.inboxes.imap.socket_error')
  rescue Net::IMAP::NoResponseError => e
    raise StandardError, I18n.t('errors.inboxes.imap.no_response_error')
  rescue Errno::EHOSTUNREACH => e
    raise StandardError, I18n.t('errors.inboxes.imap.host_unreachable_error')
  rescue Net::OpenTimeout => e
    raise StandardError,
          I18n.t('errors.inboxes.imap.connection_timed_out_error', address: channel_data[:imap_address], port: channel_data[:imap_port])
  rescue Net::IMAP::Error => e
    raise StandardError, I18n.t('errors.inboxes.imap.connection_closed_error')
  rescue StandardError => e
    raise StandardError, e.message
  ensure
    Rails.logger.error "[Api::V1::InboxesHelper] check_imap_connection failed with #{e.message}" if e.present?
  end

  def check_smtp_connection(channel_data, smtp)
    smtp.start(channel_data[:smtp_domain], channel_data[:smtp_login], channel_data[:smtp_password],
               channel_data[:smtp_authentication]&.to_sym || :login)
    smtp.finish
  end

  def set_smtp_encryption(channel_data, smtp)
    if channel_data[:smtp_enable_ssl_tls]
      set_enable_tls(channel_data, smtp)
    elsif channel_data[:smtp_enable_starttls_auto]
      set_enable_starttls_auto(channel_data, smtp)
    end
  end

  def set_enable_starttls_auto(channel_data, smtp)
    return unless smtp.respond_to?(:enable_starttls_auto)

    if channel_data[:smtp_openssl_verify_mode]
      context = enable_openssl_mode(channel_data[:smtp_openssl_verify_mode])
      smtp.enable_starttls_auto(context)
    else
      smtp.enable_starttls_auto
    end
  end

  def set_enable_tls(channel_data, smtp)
    return unless smtp.respond_to?(:enable_tls)

    if channel_data[:smtp_openssl_verify_mode]
      context = enable_openssl_mode(channel_data[:smtp_openssl_verify_mode])
      smtp.enable_tls(context)
    else
      smtp.enable_tls
    end
  end

  def enable_openssl_mode(smtp_openssl_verify_mode)
    openssl_verify_mode = "OpenSSL::SSL::VERIFY_#{smtp_openssl_verify_mode.upcase}".constantize if smtp_openssl_verify_mode.is_a?(String)
    context = Net::SMTP.default_ssl_context
    context.verify_mode = openssl_verify_mode
    context
  end

  def account_channels_method
    {
      'web_widget' => Current.account.web_widgets,
      'api' => Current.account.api_channels,
      'email' => Current.account.email_channels,
      'line' => Current.account.line_channels,
      'telegram' => Current.account.telegram_channels,
      'whatsapp' => Current.account.whatsapp_channels,
      'sms' => Current.account.sms_channels
    }[permitted_params[:channel][:type]]
  end

  def validate_limit
    return unless Current.account.inboxes.count >= Current.account.usage_limits[:inboxes]

    render_payment_required('Account limit exceeded. Upgrade to a higher plan')
  end
end