<?php
/**
 * Main Plugin Class
 *
 * The core plugin class that orchestrates all functionality.
 *
 * @package DDHH_Job_Manager
 * @since 1.0.0
 */

// Exit if accessed directly.
defined( 'ABSPATH' ) || exit;

/**
 * Class DDHH_JM_Job_Manager
 *
 * Main plugin class using singleton pattern.
 */
class DDHH_JM_Job_Manager {

	/**
	 * The single instance of the class.
	 *
	 * @var DDHH_JM_Job_Manager|null
	 */
	private static $instance = null;

	/**
	 * Get the singleton instance.
	 *
	 * @since 1.0.0
	 * @return DDHH_JM_Job_Manager
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Private constructor to prevent direct instantiation.
	 *
	 * @since 1.0.0
	 */
	private function __construct() {
		$this->register_hooks();
		$this->check_rewrite_flush();
	}

	/**
	 * Prevent cloning of the instance.
	 *
	 * @since 1.0.0
	 */
	private function __clone() {}

	/**
	 * Prevent unserializing of the instance.
	 *
	 * @since 1.0.0
	 */
	public function __wakeup() {
		throw new Exception( 'Cannot unserialize singleton' );
	}

	/**
	 * Register activation and deactivation hooks.
	 *
	 * @since 1.0.0
	 */
	private function register_hooks() {
		// Load activator and deactivator classes.
		require_once DDHH_JM_PLUGIN_DIR . 'includes/class-activator.php';
		require_once DDHH_JM_PLUGIN_DIR . 'includes/class-deactivator.php';

		// Register activation hook.
		register_activation_hook(
			DDHH_JM_PLUGIN_FILE,
			array( 'DDHH_JM_Activator', 'activate' )
		);

		// Register deactivation hook.
		register_deactivation_hook(
			DDHH_JM_PLUGIN_FILE,
			array( 'DDHH_JM_Deactivator', 'deactivate' )
		);
	}

	/**
	 * Check if rewrite rules need to be flushed.
	 *
	 * This is triggered by a transient set during activation.
	 *
	 * @since 1.0.0
	 */
	private function check_rewrite_flush() {
		if ( get_transient( 'ddhh_jm_flush_rewrite_rules' ) ) {
			flush_rewrite_rules();
			delete_transient( 'ddhh_jm_flush_rewrite_rules' );
		}
	}
}