<?php

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

/**
 * Main AI Semantic Handshake Class.
 */
class AISH_AI_Semantic_Handshake {

	/**
	 * Single instance of the class.
	 *
	 * @var AISH_AI_Semantic_Handshake
	 */
	protected static $instance;

	/**
	 * Module instances.
	 *
	 * @var array
	 */
	protected $modules = array();

	/**
	 * Returns the single instance of the class.
	 *
	 * @return AISH_AI_Semantic_Handshake
	 */
	public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor. Private to enforce singleton.
	 */
	private function __construct() {
		$this->includes();
		$this->init_modules();
	}

	/**
	 * Prevent cloning.
	 */
	private function __clone() {}

	/**
	 * Prevent unserialization.
	 */
	public function __wakeup() {
		throw new \Exception( 'Cannot unserialize singleton' );
	}

	/**
	 * Include required files.
	 */
	private function includes() {
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-logger.php';
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-partner-store.php';
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-scorer.php';
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-rest.php';
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-admin.php';
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-verifier.php';
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-frontend.php';
		require_once AISH_PLUGIN_DIR . 'includes/class-aish-cron.php';
	}

	/**
	 * Initialize modules and store references.
	 */
	private function init_modules() {
		$this->modules['rest']     = new AISH_REST();
		$this->modules['admin']    = new AISH_Admin();
		$this->modules['verifier'] = new AISH_Verifier();
		$this->modules['frontend'] = new AISH_Frontend();
		$this->modules['cron']     = new AISH_Cron();
	}

	/**
	 * Get a module instance.
	 *
	 * @param string $name Module name.
	 * @return object|null
	 */
	public function get_module( $name ) {
		return isset( $this->modules[ $name ] ) ? $this->modules[ $name ] : null;
	}
}

// Backward compatibility for existing integrations using the legacy class name.
if ( ! class_exists( 'AI_Semantic_Handshake', false ) ) {
	class_alias( 'AISH_AI_Semantic_Handshake', 'AI_Semantic_Handshake' );
}