<?php
/**
 * The kinds of product Fitzaro can try on.
 *
 * @package Fitzaro
 */

namespace Fitzaro\Prompt;

defined( 'ABSPATH' ) || exit;

/**
 * Each type has its own prompt. The type is guessed from category names and slugs (whole words,
 * English); stores with other category names set it with the `fitzaro/product_type` filter.
 *
 * When categories disagree, the narrower kind of edit wins: eyewear (adds glasses, keeps clothes),
 * then dress, then top.
 */
final class ProductType {

	public const TOP     = 'top';
	public const DRESS   = 'dress';
	public const EYEWEAR = 'eyewear';

	private const WORDS = array(
		self::EYEWEAR => array( 'eyewear', 'glasses', 'sunglasses', 'eyeglasses', 'spectacles', 'optical' ),
		self::DRESS   => array( 'dress', 'dresses', 'gown', 'gowns', 'sundress', 'sundresses' ),
		self::TOP     => array( 'top', 'tops', 'shirt', 'shirts', 'tshirt', 'tshirts', 'tee', 'tees', 'blouse', 'blouses', 'sweater', 'sweaters', 'hoodie', 'hoodies', 'sweatshirt', 'sweatshirts', 'polo', 'polos', 'cardigan', 'cardigans', 'jumper', 'jumpers', 'pullover', 'pullovers', 'knitwear', 'jacket', 'jackets', 'camisole', 'camisoles' ),
	);

	/**
	 * The type for a product's category names and slugs, or null when none is supported.
	 *
	 * @param string[] $terms Category names and slugs.
	 */
	public static function from_terms( array $terms ): ?string {
		$words = array();
		foreach ( $terms as $term ) {
			foreach ( (array) preg_split( '/[^a-z]+/', strtolower( (string) $term ), -1, PREG_SPLIT_NO_EMPTY ) as $word ) {
				$words[ (string) $word ] = true;
			}
		}

		foreach ( self::WORDS as $type => $keywords ) {
			foreach ( $keywords as $keyword ) {
				if ( isset( $words[ $keyword ] ) ) {
					return $type;
				}
			}
		}

		return null;
	}

	/**
	 * The value when it is a known type, otherwise null.
	 *
	 * @param mixed $type Candidate, e.g. a filter result.
	 */
	public static function valid( $type ): ?string {
		return is_string( $type ) && isset( self::WORDS[ $type ] ) ? $type : null;
	}
}