<?php
/**
 * Runtime requirement checks.
 *
 * @package Recast\WCS
 */

namespace Recast\WCS;

defined( 'ABSPATH' ) || exit;

/**
 * Verifies WooCommerce and WooCommerce Subscriptions are present at supported versions.
 *
 * On failure the plugin does not boot. On the next admin request it deactivates itself, and an
 * admin notice explains why.
 */
final class Requirements {

	const MIN_WC_VERSION  = '8.0';
	const MIN_WCS_VERSION = '5.0';

	/**
	 * Collected problems as [ code, context ] pairs. Translated lazily so this class can run
	 * on plugins_loaded without triggering early text-domain loading.
	 *
	 * @var array<int, array{0: string, 1: array<string, string>}>
	 */
	private $problems = array();

	/**
	 * Runs the checks and returns whether all passed.
	 *
	 * @return bool
	 */
	public function are_met() {
		$this->problems = array();

		if ( ! class_exists( 'WooCommerce' ) || ! defined( 'WC_VERSION' ) ) {
			$this->problems[] = array( 'wc_missing', array() );
		} elseif ( version_compare( WC_VERSION, self::MIN_WC_VERSION, '<' ) ) {
			$this->problems[] = array(
				'wc_version',
				array(
					'required' => self::MIN_WC_VERSION,
					'current'  => WC_VERSION,
				),
			);
		}

		if ( ! class_exists( 'WC_Subscriptions' ) || ! function_exists( 'wcs_get_subscriptions' ) ) {
			$this->problems[] = array( 'wcs_missing', array() );
		} elseif ( version_compare( (string) \WC_Subscriptions::$version, self::MIN_WCS_VERSION, '<' ) ) {
			$this->problems[] = array(
				'wcs_version',
				array(
					'required' => self::MIN_WCS_VERSION,
					'current'  => \WC_Subscriptions::$version,
				),
			);
		}

		return empty( $this->problems );
	}

	/**
	 * Returns the translated problems found by the last are_met() call.
	 *
	 * Call on or after the init hook so translations can load.
	 *
	 * @return string[]
	 */
	public function errors() {
		$messages = array();
		foreach ( $this->problems as $problem ) {
			list( $code, $ctx ) = $problem;
			switch ( $code ) {
				case 'wc_missing':
					$messages[] = __( 'Recast needs WooCommerce. Install and activate it.', 'recast-subscriptions' );
					break;
				case 'wc_version':
					/* translators: 1: required WooCommerce version, 2: current WooCommerce version */
					$messages[] = sprintf( __( 'Recast needs WooCommerce %1$s or newer. This site has WooCommerce %2$s.', 'recast-subscriptions' ), $ctx['required'], $ctx['current'] );
					break;
				case 'wcs_missing':
					$messages[] = __( 'Recast needs WooCommerce Subscriptions. Install and activate it.', 'recast-subscriptions' );
					break;
				case 'wcs_version':
					/* translators: 1: required WooCommerce Subscriptions version, 2: current version */
					$messages[] = sprintf( __( 'Recast needs WooCommerce Subscriptions %1$s or newer. This site has version %2$s.', 'recast-subscriptions' ), $ctx['required'], $ctx['current'] );
					break;
			}
		}
		return $messages;
	}

	/**
	 * Returns the raw problem codes (untranslated), safe to call at any time.
	 *
	 * @return string[]
	 */
	public function codes() {
		return array_map(
			static function ( $problem ) {
				return $problem[0];
			},
			$this->problems
		);
	}

	/**
	 * Handles unmet requirements: stops the Freemius redirect to the Recast page that follows
	 * activation, because that page does not exist without the requirements. Deactivates the
	 * plugin on the next admin request and shows a notice that lists the reasons.
	 *
	 * @return void
	 */
	public function handle_unmet() {
		if ( function_exists( 'recast_fs' ) && recast_fs() ) {
			recast_fs()->add_filter( 'redirect_on_activation', '__return_false' );
		}
		add_action( 'admin_init', array( $this, 'deactivate' ) );
		add_action( 'admin_notices', array( $this, 'render_notice' ) );
		add_action( 'network_admin_notices', array( $this, 'render_notice' ) );
	}

	/**
	 * Deactivates the plugin when the current user can manage plugins.
	 *
	 * @return void
	 */
	public function deactivate() {
		if ( ! current_user_can( 'activate_plugins' ) || ! function_exists( 'deactivate_plugins' ) ) {
			return;
		}
		$network = is_multisite() && is_plugin_active_for_network( RECAST_BASENAME );
		if ( ! $network && ! is_plugin_active( RECAST_BASENAME ) ) {
			return;
		}
		deactivate_plugins( RECAST_BASENAME, false, $network );
		// Freemius prints its notices later in this request; its "activated" notice would be wrong.
		if ( function_exists( 'recast_fs' ) && recast_fs() ) {
			recast_fs()->remove_sticky( 'premium_activated' );
		}
		// The plugin was not activated after all, so WordPress must not show "Plugin activated.".
		unset( $_GET['activate'] ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended
	}

	/**
	 * Prints the notice.
	 *
	 * @return void
	 */
	public function render_notice() {
		if ( ! current_user_can( 'activate_plugins' ) || empty( $this->problems ) ) {
			return;
		}
		echo '<div class="notice notice-error"><p><strong>';
		echo esc_html__( 'Recast Subscriptions is inactive.', 'recast-subscriptions' );
		echo '</strong></p><ul>';
		foreach ( $this->errors() as $error ) {
			echo '<li>' . esc_html( $error ) . '</li>';
		}
		echo '</ul></div>';
	}
}