<?php
/**
 * Reads product data from every place a store may keep it (core fields, other plugins, our fields).
 *
 * @package Prodlyra
 */

defined( 'ABSPATH' ) || exit;

/**
 * Product data helpers.
 */
class Prodlyra_Data {

	/**
	 * Brand taxonomies from WooCommerce core (9.6+) and popular brand plugins, in order of preference.
	 */
	const BRAND_TAXONOMIES = array( 'product_brand', 'pwb-brand', 'yith_product_brand' );

	/**
	 * True when the store already has a brand taxonomy, so we do not add our own field.
	 *
	 * @return bool
	 */
	public static function has_brand_taxonomy() {
		foreach ( self::BRAND_TAXONOMIES as $tax ) {
			if ( taxonomy_exists( $tax ) ) {
				return true;
			}
		}
		return false;
	}

	/**
	 * True when WooCommerce has its own GTIN field (9.1+).
	 *
	 * @return bool
	 */
	public static function has_native_gtin() {
		return method_exists( 'WC_Product', 'get_global_unique_id' );
	}

	/**
	 * Brand of a product.
	 *
	 * @param WC_Product $product  Product.
	 * @param bool       $fallback Use the store-wide default brand when nothing else is set.
	 * @return string
	 */
	public static function brand( $product, $fallback = true ) {
		$id = $product->get_parent_id() ? $product->get_parent_id() : $product->get_id();

		foreach ( self::BRAND_TAXONOMIES as $tax ) {
			if ( taxonomy_exists( $tax ) ) {
				$terms = get_the_terms( $id, $tax );
				if ( $terms && ! is_wp_error( $terms ) ) {
					return $terms[0]->name;
				}
			}
		}

		$meta = (string) get_post_meta( $id, '_prodlyra_brand', true );
		if ( '' !== $meta ) {
			return $meta;
		}

		foreach ( array( 'pa_brand', 'pa_marque', 'brand', 'marque' ) as $attribute ) {
			$value = $product->get_attribute( $attribute );
			if ( '' !== $value ) {
				$parts = explode( ',', $value );
				return trim( $parts[0] );
			}
		}

		return $fallback ? Prodlyra_Settings::get()['default_brand'] : '';
	}

	/**
	 * Valid GTIN (8, 12, 13 or 14 digits) or an empty string.
	 *
	 * @param WC_Product $product Product.
	 * @return string
	 */
	public static function gtin( $product ) {
		$value = '';
		if ( self::has_native_gtin() ) {
			$value = (string) $product->get_global_unique_id();
		}
		if ( '' === $value ) {
			$value = (string) get_post_meta( $product->get_id(), '_prodlyra_gtin', true );
		}
		$value = preg_replace( '/\D/', '', $value );
		return in_array( strlen( $value ), array( 8, 12, 13, 14 ), true ) ? $value : '';
	}

	/**
	 * Plain-text description (long, or short when the long one is empty).
	 *
	 * @param WC_Product $product Product.
	 * @return string
	 */
	public static function description( $product ) {
		$text = $product->get_description();
		if ( '' === trim( wp_strip_all_tags( $text ) ) ) {
			$text = $product->get_short_description();
		}
		return trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( strip_shortcodes( $text ) ) ) );
	}

	/**
	 * schema.org OfferShippingDetails built from the settings, or null when not configured.
	 *
	 * @return array|null
	 */
	public static function shipping_details() {
		if ( ! Prodlyra_Settings::shipping_configured() ) {
			return null;
		}
		$s        = Prodlyra_Settings::get();
		$currency = get_woocommerce_currency();
		$details  = array();

		foreach ( Prodlyra_Settings::countries() as $country ) {
			$details[] = array(
				'@type'               => 'OfferShippingDetails',
				'shippingRate'        => array(
					'@type'    => 'MonetaryAmount',
					'value'    => (float) $s['ship_cost'],
					'currency' => $currency,
				),
				'shippingDestination' => array(
					'@type'          => 'DefinedRegion',
					'addressCountry' => $country,
				),
				'deliveryTime'        => array(
					'@type'        => 'ShippingDeliveryTime',
					'handlingTime' => self::days( $s['handling_min'], $s['handling_max'] ),
					'transitTime'  => self::days( $s['transit_min'], $s['transit_max'] ),
				),
			);
		}
		if ( ! $details ) {
			return null;
		}
		return 1 === count( $details ) ? $details[0] : $details;
	}

	/**
	 * schema.org MerchantReturnPolicy built from the settings, or null when not configured.
	 *
	 * @return array|null
	 */
	public static function return_policy() {
		if ( ! Prodlyra_Settings::returns_configured() ) {
			return null;
		}
		$s         = Prodlyra_Settings::get();
		$countries = Prodlyra_Settings::countries();
		$policy    = array(
			'@type'             => 'MerchantReturnPolicy',
			'applicableCountry' => 1 === count( $countries ) ? $countries[0] : $countries,
		);

		$days = (int) $s['return_days'];
		if ( $days <= 0 ) {
			$policy['returnPolicyCategory'] = 'https://schema.org/MerchantReturnNotPermitted';
			return $policy;
		}

		$policy['returnPolicyCategory'] = 'https://schema.org/MerchantReturnFiniteReturnWindow';
		$policy['merchantReturnDays']   = $days;
		$policy['returnMethod']         = 'https://schema.org/ReturnByMail';
		$policy['returnFees']           = 'free' === $s['return_fees']
			? 'https://schema.org/FreeReturn'
			: 'https://schema.org/ReturnFeesCustomerResponsibility';
		return $policy;
	}

	/**
	 * A range of days as schema.org QuantitativeValue.
	 *
	 * @param int $min Minimum days.
	 * @param int $max Maximum days.
	 * @return array
	 */
	private static function days( $min, $max ) {
		return array(
			'@type'    => 'QuantitativeValue',
			'minValue' => (int) $min,
			'maxValue' => (int) $max,
			'unitCode' => 'DAY',
		);
	}
}