[WooCommerce] Receiptful + Coupon Campaigns

<?php

/**
 * Automatically assign various coupons to Coupon Campaigns
 *
 * @author dale3h
 * @notes
 *   This was a quick manual hack to get Receiptful coupons assigned to specific coupon campaigns.
 *   It would be better to make a call directly to the WC_Coupon_Campaigns object to register the taxonomy,
 *   but it only instantiates the object when loading as admin.
 */
add_action( 'woocommerce_process_shop_coupon_meta', 'wc_coupon_campaigns_auto_assign' );
add_action( 'woocommerce_api_create_coupon', 'wc_coupon_campaigns_auto_assign' );

function wc_coupon_campaigns_auto_assign( $post_id ) {
    // Define WC Coupon Campaigns taxonomy info
    $wccc_post_type = 'shop_coupon';
    $wccc_tax       = 'coupon_campaign';

    // Define our automatic campaigns
    $campaigns = array(
        'Refer a Friend'        => array( 'referral-coupons' ),
        'Refer a Friend Reward' => array( 'referral-rewards' ),
        "<font>To get you underway, here's a coupon for 10% off your next purchase in the next two weeks.</font>" => array( 'reorder-reminders' ),
    );

    // Get the post object
    $post = get_post( $post_id );

    // Bail out if no post
    if ( ! $post ) {
        return false;
    }

    // Register taxonomy
    if ( ! taxonomy_exists( $wccc_tax ) ) {
        $labels = array(
            'name'              => __( 'Coupon Campaigns' , 'wc_coupon_campaigns' ),
            'singular_name'     => __( 'Campaign', 'wc_coupon_campaigns' ),
            'search_items'      => __( 'Search Campaigns' , 'wc_coupon_campaigns' ),
            'all_items'         => __( 'All Campaigns' , 'wc_coupon_campaigns' ),
            'parent_item'       => __( 'Parent Campaign' , 'wc_coupon_campaigns' ),
            'parent_item_colon' => __( 'Parent Campaign:' , 'wc_coupon_campaigns' ),
            'edit_item'         => __( 'Edit Campaign' , 'wc_coupon_campaigns' ),
            'update_item'       => __( 'Update Campaign' , 'wc_coupon_campaigns' ),
            'add_new_item'      => __( 'Add New Campaign' , 'wc_coupon_campaigns' ),
            'new_item_name'     => __( 'New Term Campaign' , 'wc_coupon_campaigns' ),
            'menu_name'         => __( 'Coupon Campaigns' , 'wc_coupon_campaigns' ),
        );

        $args = array(
            'public'            => true,
            'show_ui'           => true,
            'show_in_nav_menus' => true,
            'hierarchical'      => true,
            'rewrite'           => true,
            'labels'            => $labels,
        );

        register_taxonomy( $wccc_tax, $wccc_post_type, $args );
    }

    // Get the campaigns that we need to assign the coupon to
    $terms = @( $campaigns[ $post->post_excerpt ] ) ?: false;

    // Bail out if no terms
    if ( ! $terms ) {
        return false;
    }

    // Add the coupon to the campaigns
    wp_add_object_terms( $post->ID, $terms, $wccc_tax );
}