<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Frontend\Schema
 */

/**
 * Returns a question object for each question in an FAQ block.
 *
 * @since 11.1
 *
 * @property array                 $data     The Schema array.
 * @property WP_Block_Parser_Block $block    The block we're taking the questions out of.
 * @property WPSEO_Schema_Context  $context  A value object with context variables.
 * @property int                   $position The position in the list.
 */
class WPSEO_Schema_FAQ_Questions {
	/**
	 * The Schema array.
	 *
	 * @var array
	 */
	private $data;
	/**
	 * All the blocks of this block-type.
	 *
	 * @var WP_Block_Parser_Block
	 */
	private $block;
	/**
	 * Position in the list.
	 *
	 * @var int
	 */
	private $position;

	/**
	 * WPSEO_Schema_FAQ_Questions constructor.
	 *
	 * @param array                 $data    Our schema graph.
	 * @param WP_Block_Parser_Block $block   The FAQ block of this type.
	 * @param WPSEO_Schema_Context  $context A value object with context variables.
	 */
	public function __construct( $data, $block, $context ) {
		$this->data     = $data;
		$this->block    = $block;
		$this->context  = $context;
		$this->position = 0;
	}

	/**
	 * Find an image based on its URL and generate a Schema object for it.
	 *
	 * @return array The Schema with Questions added.
	 */
	public function generate() {
		foreach ( $this->block['attrs']['questions'] as $question ) {
			if ( ! isset( $question['jsonAnswer'] ) || empty( $question['jsonAnswer'] ) ) {
				continue;
			}
			$this->data[] = $this->generate_question_block( $question );
		}
		return $this->data;
	}

	/**
	 * Generate a Question piece.
	 *
	 * @param array $question The question to generate schema for.
	 *
	 * @return array unsigned Schema.org Question piece.
	 */
	private function generate_question_block( $question ) {
		return array(
			'@type'          => 'Question',
			'@id'            => $this->context->canonical . '#' . $question['id'],
			'position'       => $this->position ++,
			'url'            => $this->context->canonical . '#' . $question['id'],
			'name'           => $question['jsonQuestion'],
			'answerCount'    => 1,
			'acceptedAnswer' => array(
				'@type' => 'Answer',
				'text'  => $question['jsonAnswer'],
			),
		);
	}
}
