<?php
/**
 * Recipe.
 *
 * @package ElevenRank
 * @since   1.0.0
 */

namespace ElevenRank\Modules\Schema;

use WP_Post;

defined( 'ABSPATH' ) || exit;

/**
 * A recipe needs a name and an image (Google's Recipe rules). Times are entered in minutes and
 * printed as durations; the total time is only added up when it is empty and both parts are given.
 *
 * @since 1.0.0
 */
final class Recipe_Node extends Content_Node {

	/**
	 * Builds the node.
	 *
	 * @since 1.0.0
	 *
	 * @param string               $type   Recipe.
	 * @param array<string, mixed> $fields Field values.
	 * @param WP_Post              $post   The post.
	 * @param Node_Context         $c      Page information.
	 * @param Graph                $graph  The graph.
	 * @return array<string, mixed>|null
	 */
	public function build( string $type, array $fields, WP_Post $post, Node_Context $c, Graph $graph ): ?array {
		$name  = $this->text( $fields, 'name', $this->title( $post ) );
		$image = $this->image_url( $fields, 'image', $post );

		if ( '' === $name || '' === $image ) {
			return null;
		}

		$prep  = (int) $this->text( $fields, 'prep_time' );
		$cook  = (int) $this->text( $fields, 'cook_time' );
		$total = (int) $this->text( $fields, 'total_time' );

		if ( $total < 1 && $prep > 0 && $cook > 0 ) {
			$total = $prep + $cook;
		}

		$steps = array();

		foreach ( Field_Values::split_lines( $this->text( $fields, 'instructions' ) ) as $step ) {
			$steps[] = array(
				'@type' => 'HowToStep',
				'text'  => $step,
			);
		}

		$calories = $this->text( $fields, 'calories' );
		$author   = $this->text( $fields, 'author_name' );

		return array(
			'@type'              => 'Recipe',
			'@id'                => $c->id( 'recipe' ),
			'mainEntityOfPage'   => array( '@id' => $c->id( 'webpage' ) ),
			'name'               => $name,
			'image'              => array( $image ),
			'description'        => $this->text( $fields, 'description', $this->description( $post, $c ) ),
			'author'             => '' !== $author ? array(
				'@type' => 'Person',
				'name'  => $author,
			) : $this->author( $post, $graph ),
			'datePublished'      => get_post_time( 'c', false, $post ),
			'prepTime'           => Field_Values::duration_from_minutes( $prep ),
			'cookTime'           => Field_Values::duration_from_minutes( $cook ),
			'totalTime'          => Field_Values::duration_from_minutes( $total ),
			'recipeYield'        => $this->text( $fields, 'yield' ),
			'recipeCategory'     => $this->text( $fields, 'category' ),
			'recipeCuisine'      => $this->text( $fields, 'cuisine' ),
			'keywords'           => $this->text( $fields, 'keywords' ),
			'recipeIngredient'   => Field_Values::split_lines( $this->text( $fields, 'ingredients' ) ),
			'recipeInstructions' => $steps,
			'nutrition'          => '' !== $calories ? array(
				'@type'    => 'NutritionInformation',
				'calories' => $calories,
			) : null,
			'aggregateRating'    => $this->aggregate_rating( $fields ),
		);
	}
}