<?php
/**
 * Meta for WooCommerce.
 */

namespace WooCommerce\Facebook\Framework;

use WC_Logger;
use WooCommerce\Facebook\Framework\Plugin\Compatibility;
use WooCommerce\Facebook\Framework\Plugin\Dependencies;

defined( 'ABSPATH' ) || exit;

/**
 * # WooCommerce Plugin Framework
 *
 * This framework class provides a base level of configurable and overrideable
 * functionality and features suitable for the implementation of a WooCommerce
 * plugin.  This class handles all the "non-feature" support tasks such
 * as verifying dependencies are met, loading the text domain, etc.
 *
 * @version 5.8.0
 */
abstract class Plugin {

	/** @var object single instance of plugin */
	protected static $instance;

	/** @var string plugin id */
	private $id;

	/** @var string version number */
	private $version;

	/** @var string plugin path, without trailing slash */
	private $plugin_path;

	/** @var string plugin URL */
	private $plugin_url;

	/** @var string template path, without trailing slash */
	private $template_path;

	/** @var WC_Logger instance */
	private $logger;

	/** @var  AdminMessageHandler instance */
	private $message_handler;

	/** @var string the plugin text domain */
	private $text_domain;

	/** @var array memoized list of active plugins */
	private $active_plugins = [];

	/** @var int|float minimum supported WooCommerce versions before the latest (units for major releases, decimals for minor) */
	private $min_wc_semver;

	/** @var Dependencies dependency handler instance */
	private $dependency_handler;

	/** @var \WooCommerce\Facebook\Lifecycle lifecycle handler instance */
	protected $lifecycle_handler;

	/** @var AdminNoticeHandler the admin notice handler class */
	private $admin_notice_handler;

	/** @var BatchLogHandler the batch log handler class */
	private $batch_log_handler;

	/** @var ErrorLogHandler the error log handler class */
	private $error_log_handler;

	/** @var PluginCrashHandler the plugin crash handler class */
	private $plugin_crash_handler;

	/**
	 * Initialize the plugin.
	 *
	 * Child plugin classes may add their own optional arguments.
	 *
	 * @since 2.0.0
	 *
	 * @param string $id plugin id
	 * @param string $version plugin version number
	 * @param array  $args {
	 *     optional plugin arguments
	 *
	 *     @type int|float $latest_wc_versions the last supported versions of WooCommerce, as a major.minor float relative to the latest available version
	 *     @type string $text_domain the plugin textdomain, used to set up translations
	 *     @type array  $dependencies {
	 *         PHP extension, function, and settings dependencies
	 *
	 *         @type array $php_extensions PHP extension dependencies
	 *         @type array $php_functions  PHP function dependencies
	 *         @type array $php_settings   PHP settings dependencies
	 *     }
	 * }
	 */
	public function __construct( $id, $version, $args = [] ) {
		// required params
		$this->id      = $id;
		$this->version = $version;

		$args = wp_parse_args(
			$args,
			[
				'min_wc_semver' => 0.2, // by default, 2 minor versions behind the latest published are supported
				'text_domain'   => '',
				'dependencies'  => [],
			]
		);

		$this->min_wc_semver = is_numeric( $args['min_wc_semver'] ) ? abs( $args['min_wc_semver'] ) : null;
		$this->text_domain   = $args['text_domain'];

		// initialize the dependencies manager
		$this->init_dependencies( $args['dependencies'] );

		// build the admin message handler instance
		$this->init_admin_message_handler();

		// build the admin notice handler instance
		$this->init_admin_notice_handler();

		// build the lifecycle handler instance
		$this->init_lifecycle_handler();

		// add the action & filter hooks
		$this->add_hooks();

		// build the batch log handler instance
		$this->init_batch_log_handler();

		// build the error log handler instance
		$this->init_error_log_handler();

		// register plugin fatal crash shutdown handler
		$this->init_plugin_crash_handler();
	}


	/** Init methods **********************************************************/


	/**
	 * Initializes the plugin dependency handler.
	 *
	 * @since 5.2.0
	 *
	 * @param array $dependencies {
	 *     PHP extension, function, and settings dependencies
	 *
	 *     @type array $php_extensions PHP extension dependencies
	 *     @type array $php_functions  PHP function dependencies
	 *     @type array $php_settings   PHP settings dependencies
	 * }
	 */
	protected function init_dependencies( $dependencies ) {
		$this->dependency_handler = new Dependencies( $this, $dependencies );
	}


	/**
	 * Builds the admin message handler instance.
	 *
	 * Plugins can override this with their own handler.
	 *
	 * @since 5.2.0
	 */
	protected function init_admin_message_handler() {
		$this->message_handler = new AdminMessageHandler( $this->get_id() );
	}


	/**
	 * Builds the admin notice handler instance.
	 *
	 * Plugins can override this with their own handler.
	 *
	 * @since 5.2.0
	 */
	protected function init_admin_notice_handler() {
		$this->admin_notice_handler = new AdminNoticeHandler( $this );
	}


	/**
	 * Builds the lifecycle handler instance.
	 *
	 * Plugins can override this with their own handler to perform install and
	 * upgrade routines.
	 */
	protected function init_lifecycle_handler() {
		$this->lifecycle_handler = new \WooCommerce\Facebook\Lifecycle( $this );
	}

	/**
	 * Builds the batch log handler instance.
	 *
	 * @since 3.5.0
	 */
	protected function init_batch_log_handler() {
		$this->batch_log_handler = new BatchLogHandler();
	}

	/**
	 * Builds the error log handler instance.
	 *
	 * @since 3.5.0
	 */
	protected function init_error_log_handler() {
		$this->error_log_handler = new ErrorLogHandler();
	}

	/**
	 * Builds the plugin crash handler instance and registers shutdown callback.
	 *
	 * @since 3.6.4
	 */
	protected function init_plugin_crash_handler() {
		$this->plugin_crash_handler = new PluginCrashHandler();
		$this->plugin_crash_handler->register();
	}

	/**
	 * Adds the action & filter hooks.
	 *
	 * @since 5.2.0
	 */
	private function add_hooks() {
		// hook for translations separately to ensure they're loaded
		add_action( 'init', array( $this, 'load_translations' ) );

		// add the admin notices
		add_action( 'admin_notices', array( $this, 'add_admin_notices' ) );

		// add a 'Configure' link to the plugin action links
		add_filter( 'plugin_action_links_' . plugin_basename( $this->get_plugin_file() ), array( $this, 'plugin_action_links' ) );

		// automatically log HTTP requests from SV_WC_API_Base
		$this->add_api_request_logging();

		// add any PHP incompatibilities to the system status report
		add_filter( 'woocommerce_system_status_environment_rows', array( $this, 'add_system_status_php_information' ) );
	}


	/**
	 * Cloning instances is forbidden due to singleton pattern.
	 *
	 * @since 3.1.0
	 */
	public function __clone() {
		/* translators: Placeholders: %s - plugin name */
		_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'You cannot clone instances of %s.', 'facebook-for-woocommerce' ), esc_html( $this->get_plugin_name() ) ), '3.1.0' );
	}


	/**
	 * Unserializing instances is forbidden due to singleton pattern.
	 *
	 * @since 3.1.0
	 */
	public function __wakeup() {
		/* translators: Placeholders: %s - plugin name */
		_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'You cannot unserialize instances of %s.', 'facebook-for-woocommerce' ), esc_html( $this->get_plugin_name() ) ), '3.1.0' );
	}


	/**
	 * Load plugin & framework text domains.
	 *
	 * @internal
	 *
	 * @since 4.2.0
	 */
	public function load_translations() {
		$this->load_framework_textdomain();
		// if this plugin passes along its text domain, load its translation files
		if ( $this->text_domain ) {
			$this->load_plugin_textdomain();
		}
	}


	/**
	 * Loads the framework textdomain.
	 *
	 * @since 4.5.0
	 */
	protected function load_framework_textdomain() {
		$this->load_textdomain( 'facebook-for-woocommerce', dirname( plugin_basename( $this->get_framework_file() ) ) );
	}


	/**
	 * Loads the plugin textdomain.
	 *
	 * @since 4.5.0
	 */
	protected function load_plugin_textdomain() {
		$this->load_textdomain( $this->text_domain, dirname( plugin_basename( $this->get_plugin_file() ) ) );
	}


	/**
	 * Loads the plugin textdomain.
	 *
	 * @since 4.5.0
	 * @param string $textdomain the plugin textdomain
	 * @param string $path the i18n path
	 */
	protected function load_textdomain( $textdomain, $path ) {
		// user's locale if in the admin for WP 4.7+, or the site locale otherwise
		$locale = is_admin() && is_callable( 'get_user_locale' ) ? get_user_locale() : get_locale();

		$locale = apply_filters( 'plugin_locale', $locale, $textdomain );

		load_textdomain( $textdomain, WP_LANG_DIR . '/' . $textdomain . '/' . $textdomain . '-' . $locale . '.mo' );

		// phpcs:ignore PluginCheck.CodeAnalysis.DiscouragedFunctions.load_plugin_textdomainFound -- Loads translations bundled in the plugin's own /i18n/languages directory; required for non-WordPress.org distributions (e.g. woocommerce.com) that don't receive automatic language packs.
		load_plugin_textdomain( $textdomain, false, untrailingslashit( $path ) . '/i18n/languages' );
	}

	/**
	 * Returns true if on the admin plugin settings page, if any
	 *
	 * @since 2.0.0
	 * @return boolean true if on the admin plugin settings page
	 */
	public function is_plugin_settings() {
		// optional method, not all plugins *have* a settings page
		return false;
	}


	/**
	 * Adds admin notices upon initialization.
	 *
	 * This may also produce notices if running an unsupported version of WooCommerce.
	 *
	 * @since 3.0.0
	 */
	public function add_admin_notices() {
		// bail if there's no defined versions to compare
		if ( empty( $this->min_wc_semver ) || ! is_numeric( $this->min_wc_semver ) ) {
			return;
		}

		$latest_wc_versions = Compatibility::get_latest_wc_versions();
		$current_wc_version = Compatibility::get_wc_version();

		// bail if the latest WooCommerce version or the current WooCommerce versions can't be determined
		if ( empty( $latest_wc_versions ) || empty( $current_wc_version ) ) {
			return;
		}

		// grab latest published version
		$latest_wc_version    = current( $latest_wc_versions );
		$supported_wc_version = $latest_wc_version;

		// grab semver parts
		$latest_semver    = explode( '.', $latest_wc_version );
		$supported_semver = explode( '.', (string) $this->min_wc_semver );
		$supported_major  = max( 0, (int) $latest_semver[0] - (int) $supported_semver[0] );
		$supported_minor  = isset( $supported_semver[1] ) ? (int) $supported_semver[1] : 0;
		$previous_minor   = null;

		// loop known WooCommerce versions from the most recent until we get the oldest supported one
		foreach ( $latest_wc_versions as $older_wc_version ) {

			// as we loop through versions, the latest one before we break the loop will be the minimum supported one
			$supported_wc_version = $older_wc_version;

			$older_semver = explode( '.', $older_wc_version );
			$older_major  = (int) $older_semver[0];
			$older_minor  = isset( $older_semver[1] ) ? (int) $older_semver[1] : 0;

			// if major is ignored, skip; if the minor hasn't changed (patch must be), skip
			if ( $older_major > $supported_major || $older_minor === $previous_minor ) {
				continue;
			}

			// we reached the maximum number of supported minor versions
			if ( $supported_minor <= 0 ) {
				break;
			}

			// store the previous minor while we loop patch versions, which we ignore
			$previous_minor = $older_minor;

			--$supported_minor;
		}

		// for strict comparison, we strip the patch version from the determined versions and compare only major, minor versions, ignoring patches (i.e. 1.2.3 becomes 1.2)
		$current_wc_version   = substr( $current_wc_version, 0, strpos( $current_wc_version, '.', strpos( $current_wc_version, '.' ) + 1 ) );
		$supported_wc_version = substr( $supported_wc_version, 0, strpos( $supported_wc_version, '.', strpos( $supported_wc_version, '.' ) + 1 ) );
		$compared_wc_version  = $current_wc_version && $supported_wc_version ? version_compare( $current_wc_version, $supported_wc_version ) : null;

		// installed version is at more than 2 minor versions ($min_wc_semver value) behind the last published version
		if ( -1 === $compared_wc_version ) {

			$this->get_admin_notice_handler()->add_admin_notice(
				sprintf(
					/* translators: Placeholders: %1$s - plugin name, %2$s - WooCommerce version number, %3$s - opening <a> HTML link tag, %4$s - closing </a> HTML link tag */
					__( 'Heads up! %1$s will soon discontinue support for WooCommerce %2$s. Please %3$supdate WooCommerce%4$s to take advantage of the latest updates and features.', 'facebook-for-woocommerce' ),
					$this->get_plugin_name(),
					$current_wc_version,
					'<a href="' . esc_url( admin_url( 'update-core.php' ) ) . '">',
					'</a>'
				),
				$this->get_id_dasherized() . '-deprecated-wc-version-as-of-' . str_replace( '.', '-', $supported_wc_version ),
				[ 'notice_class' => 'notice-info' ]
			);
		}
	}


	/**
	 * Return the plugin action links.  This will only be called if the plugin
	 * is active.
	 *
	 * @since 2.0.0
	 * @param array $actions associative array of action names to anchor tags
	 * @return array associative array of plugin action links
	 */
	public function plugin_action_links( $actions ) {
		$custom_actions = [];

		// settings url(s)
		if ( $this->get_settings_link( $this->get_id() ) ) {
			$custom_actions['configure'] = $this->get_settings_link( $this->get_id() );
		}

		// documentation url if any
		if ( $this->get_documentation_url() ) {
			/* translators: Docs as in Documentation */
			$custom_actions['docs'] = sprintf( '<a href="%s" target="_blank">%s</a>', $this->get_documentation_url(), esc_html__( 'Docs', 'facebook-for-woocommerce' ) );
		}

		// support url if any
		if ( $this->get_support_url() ) {
			$custom_actions['support'] = sprintf( '<a href="%s">%s</a>', $this->get_support_url(), esc_html_x( 'Support', 'noun', 'facebook-for-woocommerce' ) );
		}

		// review url if any
		if ( $this->get_reviews_url() ) {
			$custom_actions['review'] = sprintf( '<a href="%s">%s</a>', $this->get_reviews_url(), esc_html_x( 'Review', 'verb', 'facebook-for-woocommerce' ) );
		}

		// add the links to the front of the actions list
		return array_merge( $custom_actions, $actions );
	}


	/**
	 * Automatically log API requests/responses when using SV_WC_API_Base
	 *
	 * @since 2.2.0
	 * @see Base::broadcast_request()
	 */
	public function add_api_request_logging() {
		if ( ! has_action( 'wc_' . $this->get_id() . '_api_request_performed' ) ) {
			add_action( 'wc_' . $this->get_id() . '_api_request_performed', array( $this, 'log_api_request' ), 10, 2 );
		}
	}


	/**
	 * Log API requests/responses
	 *
	 * @since 2.2.0
	 * @param array       $request request data, see SV_WC_API_Base::broadcast_request() for format
	 * @param array       $response response data
	 * @param string|null $log_id log to write data to
	 */
	public function log_api_request( $request, $response, $log_id = null ) {
		$this->log( "Request\n" . $this->get_api_log_message( $request ), $log_id );
		if ( ! empty( $response ) ) {
			$this->log( "Response\n" . $this->get_api_log_message( $response ), $log_id );
		}
	}


	/**
	 * Transform the API request/response data into a string suitable for logging
	 *
	 * @since 2.2.0
	 * @param array $data
	 * @return string
	 */
	public function get_api_log_message( $data ) {
		$messages   = [];
		$messages[] = isset( $data['uri'] ) && $data['uri'] ? 'Request' : 'Response';
		foreach ( (array) $data as $key => $value ) {
			// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r
			$messages[] = trim( sprintf( '%s: %s', $key, is_array( $value ) || ( is_object( $value ) && 'stdClass' === get_class( $value ) ) ? print_r( (array) $value, true ) : $value ) );
		}
		return implode( "\n", $messages ) . "\n";
	}


	/**
	 * Adds any PHP incompatibilities to the system status report.
	 *
	 * @since 4.5.0
	 *
	 * @param array $rows WooCommerce system status rows
	 * @return array
	 */
	public function add_system_status_php_information( $rows ) {
		foreach ( $this->get_dependency_handler()->get_incompatible_php_settings() as $setting => $values ) {

			if ( isset( $values['type'] ) && 'min' === $values['type'] ) {

				// if this setting already has a higher minimum from another plugin, skip it
				if ( isset( $rows[ $setting ]['expected'] ) && $values['expected'] < $rows[ $setting ]['expected'] ) {
					continue;
				}
				/* translators: System Requirement %1$s - Actual value; %2$s - required value. */
				$note = __( '%1$s - A minimum of %2$s is required.', 'facebook-for-woocommerce' );

			} else {

				// if this requirement is already listed, skip it
				if ( isset( $rows[ $setting ] ) ) {
					continue;
				}
				/* translators: System Requirement %1$s - Actual value; %2$s - required value. */
				$note = __( 'Set as %1$s - %2$s is required.', 'facebook-for-woocommerce' );
			}

			$note = sprintf( $note, $values['actual'], $values['expected'] );

			$rows[ $setting ] = array(
				'name'     => $setting,
				'note'     => $note,
				'success'  => false,
				'expected' => $values['expected'], // WC doesn't use this, but it's useful for us
			);
		}
		return $rows;
	}


	/**
	 * Saves errors or messages to WooCommerce Log (woocommerce/logs/plugin-id-xxx.txt)
	 *
	 * @since 2.0.0
	 * @param string $message error or message to save to log
	 * @param string $log_id optional log id to segment the files by, defaults to plugin id
	 * @param string $level optional log level represents log's tag, defaults to notice
	 */
	public function log( $message, $log_id = null, $level = null ) {
		if ( is_null( $log_id ) ) {
			$log_id = $this->get_id();
		}
		if ( is_null( $level ) ) {
			$level = \WC_Log_Levels::NOTICE;
		}
		if ( ! is_object( $this->logger ) ) {
			$this->logger = new \WC_Logger();
		}
		$this->logger->log(
			$level,
			$message,
			array(
				'source' => $log_id,
			)
		);
	}


	/** Getter methods ******************************************************/


	/**
	 * Gets the main plugin file.
	 *
	 * @since 5.0.0
	 *
	 * @return string
	 */
	public function get_plugin_file() {
		$slug = dirname( plugin_basename( $this->get_file() ) );
		return trailingslashit( $slug ) . $slug . '.php';
	}


	/**
	 * The implementation for this abstract method should simply be:
	 *
	 * Return __FILE__;
	 *
	 * @since 2.0.0
	 * @return string the full path and filename of the plugin file
	 */
	abstract protected function get_file();


	/**
	 * Returns the plugin id
	 *
	 * @since 2.0.0
	 * @return string plugin id
	 */
	public function get_id() {
		return $this->id;
	}


	/**
	 * Returns the plugin id with dashes in place of underscores, and
	 * appropriate for use in frontend element names, classes and ids
	 *
	 * @since 2.0.0
	 * @return string plugin id with dashes in place of underscores
	 */
	public function get_id_dasherized() {
		return str_replace( '_', '-', $this->get_id() );
	}


	/**
	 * Returns the plugin full name including "WooCommerce", ie
	 * "WooCommerce X".  This method is defined abstract for localization purposes
	 *
	 * @since 2.0.0
	 * @return string plugin name
	 */
	abstract public function get_plugin_name();


	/**
	 * Gets the dependency handler.
	 *
	 * @since 5.2.0.1
	 *
	 * @return Dependencies
	 */
	public function get_dependency_handler() {
		return $this->dependency_handler;
	}


	/**
	 * Gets the lifecycle handler instance.
	 *
	 * @since 5.1.0
	 *
	 * @return \WooCommerce\Facebook\Lifecycle
	 */
	public function get_lifecycle_handler() {
		return $this->lifecycle_handler;
	}


	/**
	 * Gets the admin message handler.
	 *
	 * @return AdminMessageHandler
	 */
	public function get_message_handler() {
		return $this->message_handler;
	}


	/**
	 * Gets the admin notice handler instance.
	 *
	 * @since 3.0.0
	 *
	 * @return AdminNoticeHandler
	 */
	public function get_admin_notice_handler() {
		return $this->admin_notice_handler;
	}


	/**
	 * Returns the plugin version name.  Defaults to wc_{plugin id}_version
	 *
	 * @since 2.0.0
	 * @return string the plugin version name
	 */
	public function get_plugin_version_name() {
		return 'wc_' . $this->get_id() . '_version';
	}


	/**
	 * Returns the current version of the plugin
	 *
	 * @since 2.0.0
	 * @return string plugin version
	 */
	public function get_version() {
		return $this->version;
	}


	/**
	 * Returns the "Configure" plugin action link to go directly to the plugin
	 * settings page (if any)
	 *
	 * @since 2.0.0
	 * @see SV_WC_Plugin::get_settings_url()
	 * @param string $plugin_id optional plugin identifier.  Note that this can be a
	 *        sub-identifier for plugins with multiple parallel settings pages
	 *        (ie a gateway that supports both credit cards and echecks)
	 * @return string plugin configure link
	 */
	public function get_settings_link( $plugin_id = null ) {
		$settings_url = $this->get_settings_url( $plugin_id );
		if ( $settings_url ) {
			return sprintf( '<a href="%s">%s</a>', $settings_url, esc_html__( 'Configure', 'facebook-for-woocommerce' ) );
		}
		// no settings
		return '';
	}


	/**
	 * Gets the plugin configuration URL
	 *
	 * @since 2.0.0
	 * @see SV_WC_Plugin::get_settings_link()
	 * @param string $plugin_id optional plugin identifier.  Note that this can be a
	 *        sub-identifier for plugins with multiple parallel settings pages
	 *        (ie a gateway that supports both credit cards and echecks)
	 * @return string plugin settings URL
	 */
	// phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter
	public function get_settings_url( $plugin_id = null ) {
		// stub method
		return '';
	}


	/**
	 * Returns the admin configuration url for the admin general configuration page
	 *
	 * @since 3.0.0
	 * @return string admin configuration url for the admin general configuration page
	 */
	public function get_general_configuration_url() {
		return admin_url( 'admin.php?page=wc-settings&tab=general' );
	}


	/**
	 * Gets the plugin documentation url, used for the 'Docs' plugin action
	 *
	 * @since 2.0.0
	 * @return string documentation URL
	 */
	public function get_documentation_url() {
		return null;
	}


	/**
	 * Gets the support URL, used for the 'Support' plugin action link
	 *
	 * @since 4.0.0
	 * @return string support url
	 */
	public function get_support_url() {
		return null;
	}


	/**
	 * Gets the plugin sales page URL.
	 *
	 * @since 5.1.0
	 *
	 * @return string
	 */
	public function get_sales_page_url() {
		return '';
	}


	/**
	 * Gets the plugin reviews page URL.
	 *
	 * Used for the 'Reviews' plugin action and review prompts.
	 *
	 * @since 5.1.0
	 *
	 * @return string
	 */
	public function get_reviews_url() {
		return $this->get_sales_page_url() ? $this->get_sales_page_url() . '#comments' : '';
	}


	/**
	 * Gets the plugin's path without a trailing slash.
	 *
	 * E.g. /path/to/wp-content/plugins/plugin-directory
	 *
	 * @since 2.0.0
	 *
	 * @return string
	 */
	public function get_plugin_path() {
		if ( null === $this->plugin_path ) {
			$this->plugin_path = untrailingslashit( plugin_dir_path( $this->get_file() ) );
		}
		return $this->plugin_path;
	}


	/**
	 * Gets the plugin's URL without a trailing slash.
	 *
	 * E.g. http://skyverge.com/wp-content/plugins/plugin-directory
	 *
	 * @since 2.0.0
	 *
	 * @return string
	 */
	public function get_plugin_url() {
		if ( null === $this->plugin_url ) {
			$this->plugin_url = untrailingslashit( plugins_url( '/', $this->get_file() ) );
		}
		return $this->plugin_url;
	}


	/**
	 * Returns the loaded framework __FILE__
	 *
	 * @since 4.0.0
	 * @return string
	 */
	public function get_framework_file() {
		return __FILE__;
	}


	/**
	 * Gets the loaded framework path, without trailing slash.
	 *
	 * This matches the path to the highest version of the framework currently loaded.
	 *
	 * @since 4.0.0
	 * @return string
	 */
	public function get_framework_path() {
		return untrailingslashit( plugin_dir_path( $this->get_framework_file() ) );
	}


	/**
	 * Gets the absolute path to the loaded framework image directory, without a trailing slash.
	 *
	 * @since 4.0.0
	 *
	 * @return string
	 */
	public function get_framework_assets_path() {
		return $this->get_framework_path() . '/assets';
	}


	/**
	 * Gets the loaded framework assets URL without a trailing slash.
	 *
	 * @since 4.0.0
	 *
	 * @return string
	 */
	public function get_framework_assets_url() {
		return untrailingslashit( plugins_url( '/assets', $this->get_framework_file() ) );
	}

	/**
	 * Determines whether a plugin is active.
	 *
	 * @since 2.0.0
	 *
	 * @param string $plugin_name plugin name, as the plugin-filename.php
	 * @return boolean true if the named plugin is installed and active
	 */
	public function is_plugin_active( $plugin_name ) {
		$is_active = false;
		if ( is_string( $plugin_name ) ) {
			if ( ! array_key_exists( $plugin_name, $this->active_plugins ) ) {
				$active_plugins = (array) get_option( 'active_plugins', [] );
				if ( is_multisite() ) {
					$active_plugins = array_merge( $active_plugins, array_keys( get_site_option( 'active_sitewide_plugins', [] ) ) );
				}
				$plugin_filenames = [];
				foreach ( $active_plugins as $plugin ) {
					if ( Helper::str_exists( $plugin, '/' ) ) {
						// normal plugin name (plugin-dir/plugin-filename.php)
						list( , $filename ) = explode( '/', $plugin );
					} else {
						// no directory, just plugin file
						$filename = $plugin;
					}
					$plugin_filenames[] = $filename;
				}
				$this->active_plugins[ $plugin_name ] = in_array( $plugin_name, $plugin_filenames, true );
			}
			$is_active = (bool) $this->active_plugins[ $plugin_name ];
		}
		return $is_active;
	}
}
