<?php
/**
 * The shop's free-shipping rules from WooCommerce, so the campaign guide can tell in plain words how
 * shipping is calculated when a code is used. Read only; the plugin never changes shipping.
 *
 * @package CNWS\Coupons
 */

namespace CNWS\Coupons\Admin;

defined( 'ABSPATH' ) || exit;

final class ShippingInfo {

	/**
	 * Zones with at least one enabled method.
	 *
	 * @return array<int, array{name: string, methods: int, free: array<int, array{requires: string, min_amount: float, before_discount: bool}>}>
	 */
	public static function zones(): array {
		if ( ! class_exists( '\WC_Shipping_Zones' ) || ! class_exists( '\WC_Shipping_Zone' ) ) {
			return array();
		}

		$zones = array();
		$all   = array_map( static fn( $zone ) => (int) $zone['id'], \WC_Shipping_Zones::get_zones() );
		$all[] = 0;

		foreach ( $all as $id ) {
			$zone    = new \WC_Shipping_Zone( $id );
			$methods = $zone->get_shipping_methods( true );

			if ( ! $methods ) {
				continue;
			}

			$free = array();

			foreach ( $methods as $method ) {
				if ( 'free_shipping' !== $method->id ) {
					continue;
				}

				$free[] = array(
					'requires'        => (string) $method->requires,
					'min_amount'      => (float) wc_format_decimal( $method->min_amount ),
					'before_discount' => 'yes' === $method->ignore_discounts,
				);
			}

			$zones[] = array(
				'name'    => html_entity_decode( (string) $zone->get_zone_name(), ENT_QUOTES ),
				'methods' => count( $methods ),
				'free'    => $free,
			);
		}

		return $zones;
	}
}