<?php
/**
 * WooCommerce specific optimizer.
 */

defined( 'ABSPATH' ) || exit;

class Adbear_Alt_Text_Generator_WooCommerce {
	protected $updater;

	public function __construct( Adbear_Alt_Text_Generator_Updater $updater ) {
		$this->updater = $updater;
	}

	public function is_available() {
		return class_exists( 'WooCommerce' );
	}

	public function optimize_product_images() {
		if ( ! $this->is_available() ) {
			return 0;
		}

		$updated = 0;
		$query   = new WP_Query(
			array(
				'post_type'      => 'product',
				'post_status'    => array( 'publish', 'draft', 'pending', 'private' ),
				'posts_per_page' => -1,
				'fields'         => 'ids',
				'no_found_rows'  => true,
			)
		);

		foreach ( $query->posts as $product_id ) {
			$product_id   = absint( $product_id );
			$product_name = sanitize_text_field( get_the_title( $product_id ) );

			$thumb_id = absint( get_post_meta( $product_id, '_thumbnail_id', true ) );
			if ( $thumb_id > 0 && $this->optimize_attachment_for_product( $thumb_id, $product_name ) ) {
				++$updated;
			}

			$gallery_ids = (string) get_post_meta( $product_id, '_product_image_gallery', true );
			if ( '' !== $gallery_ids ) {
				$ids = array_filter( array_map( 'absint', explode( ',', $gallery_ids ) ) );
				foreach ( $ids as $image_id ) {
					if ( $image_id > 0 && $this->optimize_attachment_for_product( $image_id, $product_name ) ) {
						++$updated;
					}
				}
			}
		}

		wp_reset_postdata();
		return $updated;
	}

	protected function optimize_attachment_for_product( $attachment_id, $product_name ) {
		$current_alt   = (string) get_post_meta( $attachment_id, '_wp_attachment_image_alt', true );
		$current_title = (string) get_the_title( $attachment_id );

		$new_alt   = '' === trim( $current_alt ) ? $product_name : $current_alt;
		$new_title = '' === trim( $current_title ) ? $product_name : $current_title;

		if ( $new_alt === $current_alt && $new_title === $current_title ) {
			return false;
		}

		return $this->updater->update_single( $attachment_id, $new_alt, $new_title );
	}
}