abstract class Controller extends Service_Provider {
	/**
	 * Registers the filters and actions hooks added by the controller if the controller has not registered yet.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	public function register() {
		/*
		 * Look up and set the value in the container request cache to allow building the same Controller
		 * with a **different** container. (e.g. in tests).
		 */
		if ( static::is_registered() ) {
			return;
		}

		// Register the controller as a singleton in the container.
		// @todo remove when the Container is updated to bind Providers as singletons by default.
		$this->container->singleton( static::class, $this );

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

		$this->container->setVar( static::class . '_registered', true );

		$this->do_register();
	}

	/**
	 * Registers the filters and actions hooks added by the controller.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	abstract protected function do_register(): void;

	/**
	 * Removes the filters and actions hooks added by the controller.
	 *
	 * Bound implementations should not be removed in this method!
	 *
	 * @since 1.0.0
	 *
	 * @return void Filters and actions hooks added by the controller are be removed.
	 */
	abstract public function unregister(): void;

	/**
	 * Whether the controller is active or not.
	 *
	 * Controllers will be active by default, if that is not the case, the controller should override this method.
	 *
	 * @since 1.0.0
	 *
	 * @return bool Whether the controller is active or not.
	 */
	public function is_active(): bool {
		return true;
	}

	/**
	 * Logs a message at the `debug` level.
	 *
	 * @since 1.0.0
	 *
	 * @param string $message The message to log.
	 * @param array  $context An array of context to log with the message.
	 *
	 * @return void The message is logged.
	 */
	protected function debug( string $message, array $context = [] ): void {
		do_action( 'tec_conference_log', 'debug', $message, array_merge( [
			'controller' => static::class,
		], $context ) );
	}

	/**
	 * Logs a message at the `warning` level.
	 *
	 * @since 1.0.0
	 *
	 * @param string $message The message to log.
	 * @param array  $context An array of context to log with the message.
	 *
	 * @return void The message is logged.
	 */
	protected function warning( string $message, array $context = [] ): void {
		do_action( 'tec_conference_log', 'warning', $message, array_merge( [
			'controller' => static::class,
		], $context ) );
	}

	/**
	 * Logs a message at the `error` level.
	 *
	 * @since 1.0.0
	 *
	 * @param string $message The message to log.
	 * @param array  $context An array of context to log with the message.
	 *
	 * @return void The message is logged.
	 */
	protected function error( string $message, array $context = [] ): void {
		do_action( 'tec_conference_log', 'error', $message, array_merge( [
			'controller' => static::class,
		], $context ) );
	}

	/**
	 * Returns whether any instance of this controller has been registered or not.
	 *
	 * @since 1.0.0
	 *
	 * @return bool Whether any instance of this controller has been registered or not.
	 */
	public static function is_registered(): bool {
		return (bool) tribe()->getVar( static::class . '_registered' );
	}
}