<?php
/**
 * Core plugin orchestrator.
 *
 * Wires up all subsystems (hooks, REST, admin, cron) using a singleton
 * pattern. Keeps the main bootstrap file thin and testable.
 *
 * @package ActivityPilot
 */

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

final class APWPM_Plugin {

	/**
	 * @var APWPM_Plugin|null
	 */
	private static $instance = null;

	/**
	 * Singleton accessor.
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	private function __construct() {}

	/**
	 * Prevent cloning / unserializing the singleton.
	 */
	public function __clone() {
		_doing_it_wrong( __FUNCTION__, 'Cloning is not allowed.', '1.0.0' );
	}

	public function __wakeup() {
		_doing_it_wrong( __FUNCTION__, 'Unserializing is not allowed.', '1.0.0' );
	}

	/**
	 * Initialize all subsystems.
	 */
	public function run() {
		// Run pending DB migrations on every load — cheap & idempotent.
		APWPM_Migrator::migrate();

		APWPM_Hooks::instance()->register();
		APWPM_REST_API::instance()->register();
		APWPM_Cron::instance()->register();
		APWPM_Multisite::init();
		APWPM_Error_Integration::init();

		// New v1.3 subsystems.
		APWPM_Queue::init();
		APWPM_Immutable::init();
		APWPM_PII::init();
		APWPM_Geo::init();
		APWPM_IP_Throttle::init();
		APWPM_File_Integrity::init();
		APWPM_Webhooks::init();
		APWPM_Integrations::init();
		APWPM_Site_Health::init();
		APWPM_Reports::init();
		APWPM_Event_Registry::boot();

		// Annotate every row with hash-chain metadata (lowest priority so
		// other filters can modify the row first).
		add_filter( 'apwpm_pre_insert_row', array( 'APWPM_Integrity', 'annotate' ), 99, 2 );

		// Per-user opt-out checkbox on the WP profile page.
		add_action( 'show_user_profile', array( 'APWPM_Workflow', 'profile_fields' ) );
		add_action( 'edit_user_profile', array( 'APWPM_Workflow', 'profile_fields' ) );
		add_action( 'personal_options_update',  array( 'APWPM_Workflow', 'save_profile_fields' ) );
		add_action( 'edit_user_profile_update', array( 'APWPM_Workflow', 'save_profile_fields' ) );

		if ( is_admin() || is_network_admin() ) {
			APWPM_Admin::instance()->register();
		}
	}
}