D, $this->thumbnailSize ) : '';
	}

	/**
	 * Returns the first image found in the post content.
	 *
	 * @since 4.0.0
	 *
	 * @return string The image URL.
	 */
	private function getFirstImageInContent() {
		$cachedImage = $this->getCachedImage();
		if ( $cachedImage ) {
			return $cachedImage;
		}

		$postContent = aioseo()->helpers->getPostContent( $this->post );
		preg_match_all( '|<img.*?src=[\'"](.*?)[\'"].*?>|i', $postContent, $matches );

		// Ignore cover block background image - WP >= 5.7.
		if ( ! empty( $matches[0] ) && apply_filters( 'aioseo_social_image_ignore_cover_block', true, $this->post, $matches ) ) {
			foreach ( $matches[0] as $key => $match ) {
				if ( false !== stripos( $match, 'wp-block-cover__image-background' ) ) {
					unset( $matches[1][ $key ] );
				}
			}
		}

		return ! empty( $matches[1] ) ? current( $matches[1] ) : '';
	}

	/**
	 * Returns the author avatar.
	 *
	 * @since 4.0.0
	 *
	 * @return string The image URL.
	 */
	private function getAuthorAvatar() {
		$avatar = get_avatar( $this->post->post_author, 300 );
		preg_match( "/src='(.*?)'/i", $avatar, $matches );

		return ! empty( $matches[1] ) ? $matches[1] : '';
	}

	/**
	 * Returns the first available image.
	 *
	 * @since 4.0.0
	 *
	 * @return string The image URL.
	 */
	private function getFirstAvailableImage() {
		// Disable the cache.
		$this->useCache = false;

		$image = $this->getCustomFieldImage();

		if ( ! $image ) {
			$image = $this->getFeaturedImage();
		}

		if ( ! $image ) {
			$image = $this->getFirstAttachedImage();
		}

		if ( ! $image ) {
			$image = $this->getFirstImageInContent();
		}

		if ( ! $image && 'twitter' === strtolower( $this->type ) ) {
			$image = aioseo()->options->social->twitter->homePage->image;
		}

		// Enable the cache.
		$this->useCache = true;

		return $image ? $image : aioseo()->options->social->facebook->homePage->image;
	}

	/**
	 * Returns the image from a custom field.
	 *
	 * @since 4.0.0
	 *
	 * @return string The image URL.
	 */
	private function getCustomFieldImage() {
		$cachedImage = $this->getCachedImage();
		if ( $cachedImage ) {
			return $cachedImage;
		}

		$prefix = 'facebook' === strtolower( $this->type ) ? 'og_' : 'twitter_';

		$aioseoPost   = Models\Post::getPost( $this->post->ID );
		$customFields = ! empty( $aioseoPost->{ $prefix . 'image_custom_fields' } )
			? $aioseoPost->{ $prefix . 'image_custom_fields' }
			: aioseo()->options->social->{$this->type}->general->customFieldImagePosts;

		if ( ! $customFields ) {
			return '';
		}

		$customFields = explode( ',', $customFields );
		foreach ( $customFields as $customField ) {
			$image = get_post_meta( $this->post->ID, $customField, true );

			if ( ! empty( $image ) ) {
				return is_numeric( $image )
					? wp_get_attachment_image_src( $image, $this->thumbnailSize )
					: $image;
			}
		}

		return '';
	}

	/**
	 * Returns the cached image if there is one.
	 *
	 * @since 4.1.6.2
	 *
	 * @param  \WP_Term     $object The object for which we need to get the cached image.
	 * @return string|array         The image URL or data.
	 */
	protected function getCachedImage( $object = null ) {
		if ( null === $object ) {
			// This isn't null if we call it from the Pro class.
			$object = $this->post;
		}

		$metaData = aioseo()->meta->metaData->getMetaData( $object );

		switch ( $this->type ) {
			case 'facebook':
				if ( ! empty( $metaData->og_image_url ) && $this->useCache ) {
					return aioseo()->meta->metaData->getCachedOgImage( $metaData );
				}
				break;
			case 'twitter':
				if ( ! empty( $metaData->twitter_image_url ) && $this->useCache ) {
					return $metaData->twitter_image_url;
				}
				break;
			default:
				break;
		}

		return '';
	}
}