<?php
namespace Strikewise\Admin;

defined( 'ABSPATH' ) || exit;

/**
 * Detects plugins whose prices Strikewise cannot record: discount rule plugins
 * change prices without a WooCommerce sale price, multi-currency plugins can set
 * fixed prices per currency. The shop has to check those prices itself.
 */
final class Compat {

	/**
	 * @return array<string,string> Plugin file => name.
	 */
	private static function discount_candidates(): array {
		/**
		 * Filters the discount rule plugins Strikewise warns about.
		 *
		 * @param array<string,string> $plugins Plugin file => name.
		 */
		return (array) apply_filters(
			'strikewise_discount_plugins',
			array(
				'woo-discount-rules/woo-discount-rules.php' => 'Discount Rules for WooCommerce',
				'advanced-dynamic-pricing-for-woocommerce/advanced-dynamic-pricing-for-woocommerce.php' => 'Advanced Dynamic Pricing for WooCommerce',
				'woocommerce-dynamic-pricing/woocommerce-dynamic-pricing.php' => 'WooCommerce Dynamic Pricing',
				'yith-woocommerce-dynamic-pricing-and-discounts-premium/init.php' => 'YITH WooCommerce Dynamic Pricing and Discounts',
				'wc-dynamic-pricing-and-discounts/wc-dynamic-pricing-and-discounts.php' => 'WooCommerce Dynamic Pricing & Discounts',
			)
		);
	}

	/**
	 * @return array<string,string> Plugin file => name.
	 */
	private static function currency_candidates(): array {
		/**
		 * Filters the multi-currency plugins Strikewise warns about.
		 *
		 * @param array<string,string> $plugins Plugin file => name.
		 */
		return (array) apply_filters(
			'strikewise_currency_plugins',
			array(
				'woocommerce-multilingual/wpml-woocommerce.php' => 'WooCommerce Multilingual & Multicurrency',
				'woo-multi-currency/woo-multi-currency.php' => 'CURCY Multi Currency',
				'woocommerce-multi-currency/woocommerce-multi-currency.php' => 'CURCY Multi Currency',
				'woocommerce-currency-switcher/index.php' => 'FOX Currency Switcher',
				'woocommerce-aelia-currencyswitcher/woocommerce-aelia-currencyswitcher.php' => 'Aelia Currency Switcher',
			)
		);
	}

	/**
	 * @return string[] Names of the active discount rule plugins.
	 */
	public static function discount_plugins(): array {
		return self::active( self::discount_candidates() );
	}

	/**
	 * @return string[] Names of the active multi-currency plugins.
	 */
	public static function currency_plugins(): array {
		return self::active( self::currency_candidates() );
	}

	/**
	 * @param array<string,string> $candidates
	 * @return string[]
	 */
	private static function active( array $candidates ): array {
		$active = array_merge( (array) get_option( 'active_plugins', array() ), array_keys( (array) get_site_option( 'active_sitewide_plugins', array() ) ) );
		return array_values( array_unique( array_intersect_key( $candidates, array_flip( $active ) ) ) );
	}
}