<?php

/**
 * Class MC4WP_Admin_Messages
 *
 * @ignore
 * @since 3.0
 */
class MC4WP_Admin_Messages {

	/**
	 * @var array
	 */
	protected $bag;

	/**
	 * @var bool
	 */
	protected $dirty = false;

	/**
	 * Add hooks
	 */
	public function add_hooks() {
		add_action( 'admin_notices', array( $this, 'show' ) );
		register_shutdown_function( array( $this, 'save' ) );
	}

	private function load() {
		if( is_null( $this->bag ) ) {
			$this->bag = get_option( 'mc4wp_flash_messages', array() );
		}
	}

	// empty flash bag
	private function reset() {
		$this->bag = array();
		$this->dirty = true;
	}

	/**
	 * Flash a message (shows on next pageload)
	 *
	 * @param        $message
	 * @param string $type
	 */
	public function flash( $message, $type = 'success' ) {
		$this->load();
		$this->bag[] = array(
			'text' => $message,
			'type' => $type
		);
		$this->dirty = true;
	}



	/**
	 * Show queued flash messages
	 */
	public function show() {
		$this->load();

		foreach( $this->bag as $message ) {
			echo sprintf( '<div class="notice notice-%s is-dismissible"><p>%s</p></div>', $message['type'], $message['text'] );
		}

		$this->reset();
	}

	/**
	 * Save queued messages
	 *
	 * @hooked `shutdown`
	 */
	public function save() {
		if( $this->dirty ) {
			update_option( 'mc4wp_flash_messages', $this->bag, false );
		}
	}
}