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Filename : DeprecatedClassFacade.php
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<?php
/**
 * A facade to allow deprecating an entire class. Calling instance or static
 * functions on the facade triggers a deprecation notice before calling the
 * underlying function.
 *
 * Use it by extending DeprecatedClassFacade in your facade class, setting the
 * static $facade_over_classname string to the name of the class to build
 * a facade over, and setting the static $deprecated_in_version to the version
 * that the class was deprecated in. Eg.:
 *
 * class DeprecatedGoose extends DeprecatedClassFacade {
 *     static $facade_over_classname = 'Goose';
 *     static $deprecated_in_version = '1.7.0';
 * }
 */

namespace Automattic\WooCommerce\Admin;

defined( 'ABSPATH' ) || exit;

// phpcs:disable WordPress.Security.EscapeOutput.OutputNotEscaped

/**
 * A facade to allow deprecating an entire class.
 */
class DeprecatedClassFacade {

	/**
	 * The instance that this facade covers over.
	 *
	 * @var object
	 */
	protected $instance;

	/**
	 * The name of the non-deprecated class that this facade covers.
	 *
	 * @var string
	 */
	protected static $facade_over_classname = '';

	/**
	 * The version that this class was deprecated in.
	 *
	 * @var string
	 */
	protected static $deprecated_in_version = '';

	/**
	 * Static array of logged messages.
	 *
	 * @var array
	 */
	private static $logged_messages = array();

	/**
	 * Constructor.
	 */
	public function __construct() {
		if ( '' !== static::$facade_over_classname ) {
			$this->instance = new static::$facade_over_classname();
		}
	}

	/**
	 * Log a deprecation to the error log.
	 *
	 * @param string $function The name of the deprecated function being called.
	 */
	private static function log_deprecation( $function ) {
		$message = sprintf(
			'%1$s is deprecated since version %2$s! Use %3$s instead.',
			static::class . '::' . $function,
			static::$deprecated_in_version,
			static::$facade_over_classname . '::' . $function
		);

		if ( '' !== static::$facade_over_classname ) {
			$message = $message . sprintf(
				' Use %s instead.',
				static::$facade_over_classname . '::' . $function
			);
		}

		// Only log when the message has not been logged before.
		if ( ! in_array( $message, self::$logged_messages, true ) ) {
			error_log( $message ); // phpcs:ignore
			self::$logged_messages[] = $message;
		}
	}

	/**
	 * Executes when calling any function on an instance of this class.
	 *
	 * @param string $name      The name of the function being called.
	 * @param array  $arguments An array of the arguments to the function call.
	 */
	public function __call( $name, $arguments ) {
		self::log_deprecation( $name );

		if ( ! isset( $this->instance ) ) {
			return;
		}

		return call_user_func_array(
			array(
				$this->instance,
				$name,
			),
			$arguments
		);
	}

	/**
	 * Executes when calling any static function on this class.
	 *
	 * @param string $name      The name of the function being called.
	 * @param array  $arguments An array of the arguments to the function call.
	 */
	public static function __callStatic( $name, $arguments ) {
		self::log_deprecation( $name );

		if ( '' === static::$facade_over_classname ) {
			return;
		}

		return call_user_func_array(
			array(
				static::$facade_over_classname,
				$name,
			),
			$arguments
		);
	}
}