[1.3.x] Sample Extension

/**
  * Modifies the global email transaction attributes
  *
  * @param array $attributes
  * @return array
  */
function wc_maileon_modify_transaction_attributes($attributes) {
    $attributes []= new AttributeType(null, 'booking.id', DataType::$STRING, false);
    $attributes []= new AttributeType(null, 'booking.start_date', DataType::$TIMESTAMP, false);
    $attributes []= new AttributeType(null, 'booking.end_date', DataType::$TIMESTAMP, false);

    return $attributes;
}
add_filter('wc_maileon_transaction_attributes', 'wc_maileon_modify_transaction_attributes');

/**
  * Modifies the global email transaction content
  *
  * @param array $content
  * @param \WC_Order $order
  * @return array
  */
function wc_maileon_modify_transaction_content($content, $order) {
    $bookings = \WC_Booking_Data_Store::get_booking_ids_from_order_id( $order->get_id() );

    foreach ( $bookings as $booking_id ) {
        $booking = get_wc_booking( $booking_id );
        $content['booking.id'] = (string)$booking_id;
        $content['booking.start_date'] = $booking->get_start_date();
        $content['booking.end_date'] = $booking->get_end_date();

        // only add the first booking
        break;
    }
    return $content;
}
add_filter('wc_maileon_transaction_content', 'wc_maileon_modify_transaction_content', 10, 2);

function wc_maileon_extend_email_hooks($hooks) {
    $hooks['booking_reminder'] = BookingReminder::class;

    return $hooks;
}
add_filter('wc_maileon_email_hooks', 'wc_maileon_extend_email_hooks');

class BookingReminder extends \Maileon\WooCommerce\Emails\OrderStatusChanged {
    /**
     * Trigger a transaction based on the given object
     *
     * @param mixed $object
     * @param string $to          The email address to send message.
	 * @param string       $subject     Optional. Email subject
	 * @param string       $message     Optional. Message contents
	 * @param string|array $headers     Optional. Additional headers.
	 * @param string|array $attachments Optional. Files to attach.
	 * @return bool Whether the email contents were sent successfully.
     */
    public function trigger($object, $to, $subject = '', $message = '', $headers = '', $attachments = array()) {
        $booking = get_wc_booking($object);

        if (is_a($booking, \WC_Booking::class)) {
            $content = $this->map_maileon_booking_transaction_content($booking);

            $order = $booking->get_order();
            if(!is_object($order)) {
                return;
            }

            $customer_id = $order->get_customer_id();

            return $this->trigger_maileon_transaction($to, $content, $customer_id, $object, $this->id);
        } else {
            throw new \Exception("Booking not found for id: " . $object);
        }
    }

    /**
     * Sets the default value for the Maileon transaction name
     *
     * @return void
     */
    public function init_form_fields()
    {
        parent::init_form_fields();
        $this->form_fields['maileon_transaction_name']['default'] = 'wc_booking_reminder';
    }

    /**
     * Returns the maileon transaction type definition
     *
     * @return array
     */
    public function get_transaction_attributes() {
        return [
            new AttributeType(null, 'booking.id', DataType::$STRING, false),
            new AttributeType(null, 'booking.start_date', DataType::$TIMESTAMP, false),
            new AttributeType(null, 'booking.end_date', DataType::$TIMESTAMP, false),
            new AttributeType(null, 'booking.zoom.link', DataType::$STRING, false),
        ];
    }

    /**
     * Maps the underlying booking to the transaction
     *
     * @param \WC_Booking $booking
     * @return array
     */
    public function map_maileon_booking_transaction_content($booking) {
        return [
            'booking.id' => (string)$booking->get_id(),
            'booking.start_date' => $booking->get_start_date(),
            'booking.end_date' => $booking->get_end_date(),
            'booking.zoom.link' => WC_Bookings_Maileon()->get_zoom_browser_join_link($booking->get_id())
        ];
    }
}