This is a boilerplate for using Algolia in WooCommerce

search-by-algolia-for-woocommerce.php

<?php

/**
 * @wordpress-plugin
 * Plugin Name: Search by Algolia for WooCommerce - Instant & Relevant results 
 */


/**
 * If Algolia is not active, let users know.
 **/
if ( ! in_array( 'algolia/algolia.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
	add_action( 'admin_notices', function() {
		echo '<div class="error notice">
			  	<p>' . esc_html__( 'Algolia Search for WooCommerce: Algolia Search plugin should be enabled.', 'algolia-woocommerce' ) . '</p>
		  	  </div>';
	} );
}

/**
 * If WooCommerce is not active, let users know.
 **/
if ( ! in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
	add_action( 'admin_notices', function() {
		echo '<div class="error notice">
			  	<p>' . esc_html__( 'Algolia Search for WooCommerce: WooCommerce plugin should be enabled.', 'algolia-woocommerce' ) . '</p>
		  	  </div>';
	} );
}

/**
 * @param array   $attributes
 * @param WP_Post $post
 *
 * @return array
 */
function aw_product_shared_attributes( array $attributes, WP_Post $post ) {
	$product = wc_get_product( $post );

	$attributes['product_type'] = (string) $product->get_type();
	$attributes['display_price'] = (float) $product->get_display_price();
	$attributes['price'] = (float) $product->get_price();
	$attributes['price_excluding_tax'] = (float) $product->get_price_excluding_tax();
	$attributes['regular_price'] = (float) $product->get_regular_price();
	$attributes['sale_price'] = (float) $product->get_sale_price();
	$attributes['sale_price'] = (float) $product->get_price();
	$attributes['average_rating'] = (float) $product->get_average_rating();
	$attributes['rating_count'] = (int) $product->get_rating_count();
	$attributes['attributes'] = (array) $product->get_attributes();
	$attributes['width'] = (string) $product->get_width();
	$attributes['height'] = (string) $product->get_height();
	$attributes['weight'] = (string) $product->get_weight();
	$attributes['length'] = (string) $product->get_length();
	$attributes['review_count'] = (int) $product->get_review_count();
	$attributes['dimensions'] = (string) $product->get_dimensions();
	$attributes['total_sales'] = (int) get_post_meta( $post->ID, 'total_sales', true );

	return $attributes;
}

add_filter( 'algolia_post_product_shared_attributes', 'aw_product_shared_attributes', 10, 2 );
add_filter( 'algolia_searchable_post_product_shared_attributes', 'aw_product_shared_attributes', 10, 2 );

/**
 * @param bool    $should_index
 * @param WP_Post $post
 *
 * @return bool
 */
function aw_should_index_post( $should_index, WP_Post $post ) {
	// Only alter decision making if we are dealing with a product.
	if ( 'product' !== $post->post_type ) {
		return $should_index;
	}

	// This is required as `is_visible` method also checks for user_cap.
	if( 'publish' !== $post->post_status ) {
		return false;
	}

	$product = wc_get_product( $post );
	// We extracted this check because `is_visible` will not detect searchable products if not in a loop.
	if ( 'search' === $product->visibility ) {
		return true;
	}

	return $product->is_visible();
}

add_filter( 'algolia_should_index_post', 'aw_should_index_post', 10, 2 );
add_filter( 'algolia_should_index_searchable_post', 'aw_should_index_post', 10, 2 );