<?php
/**
 * Core plugin class — entry point for the ROBOTSTXT Manager plugin.
 *
 * @package Robotstxt_Manager
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class Robotstxt_Manager_Plugin
 *
 * Singleton that owns the loader instance and wires up all component hooks.
 */
final class Robotstxt_Manager_Plugin {

	/**
	 * Singleton instance.
	 *
	 * @var self|null
	 */
	private static ?self $instance = null;

	/**
	 * Hook loader.
	 *
	 * @var Robotstxt_Manager_Loader
	 */
	private Robotstxt_Manager_Loader $loader;

	/**
	 * Returns the singleton instance, creating it on the first call.
	 *
	 * @return self
	 */
	public static function get_instance(): self {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Constructor — private to enforce singleton usage.
	 */
	private function __construct() {
		$this->loader = new Robotstxt_Manager_Loader();
		$this->define_hooks();
	}

	/**
	 * Wires component callbacks into the loader.
	 *
	 * @return void
	 */
	private function define_hooks(): void {
		$this->loader->add_action( 'init', $this, 'load_textdomain' );

		$admin     = new Robotstxt_Manager_Admin();
		$settings  = new Robotstxt_Manager_Settings();
		$installer = new Robotstxt_Manager_Installer();
		$updater   = new Robotstxt_Manager_Updater();

		$admin->register( $this->loader );
		$settings->register( $this->loader );
		$installer->register( $this->loader );
		$updater->register( $this->loader );
	}

	/**
	 * Loads the plugin text domain for i18n.
	 *
	 * @return void
	 */
	public function load_textdomain(): void {
		load_plugin_textdomain(
			'robotstxt-manager',
			false,
			dirname( ROBOTSTXT_MANAGER_BASENAME ) . '/languages'
		);
	}

	/**
	 * Dispatches all registered hooks to WordPress.
	 *
	 * @return void
	 */
	public function run(): void {
		$this->loader->run();
	}
}