<?php
/**
 * Main Plugin Class
 *
 * @package User_ID
 */

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

class User_ID_Plugin {

	/**
	 * Instance of this class.
	 *
	 * @var User_ID_Plugin
	 */
	protected static $instance = null;

	/**
	 * Return an instance of this class.
	 *
	 * @return User_ID_Plugin A single instance of this class.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	private function __construct() {
		$this->includes();
		$this->init_hooks();
	}

	/**
	 * Include required files.
	 */
	private function includes() {
		require_once USER_ID_DIR . 'includes/class-admin.php';
		require_once USER_ID_DIR . 'includes/class-user-debug.php';
		require_once USER_ID_DIR . 'includes/class-login-tracker.php';
		require_once USER_ID_DIR . 'includes/class-activity-logger.php';
		require_once USER_ID_DIR . 'includes/class-impersonation.php';
		require_once USER_ID_DIR . 'includes/class-rest-api.php';

		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			require_once USER_ID_DIR . 'includes/class-wp-cli.php';
		}
	}

	/**
	 * Initialize hooks.
	 */
	private function init_hooks() {
		add_action( 'admin_init', array( $this, 'check_db_version' ) );
	}

	/**
	 * Check if DB needs updating.
	 */
	public function check_db_version() {
		if ( get_option( 'user_id_db_version' ) !== USER_ID_VERSION ) {
			self::activate();
			update_option( 'user_id_db_version', USER_ID_VERSION );
		}
	}

	/**
	 * Plugin activation logic.
	 */
	public static function activate() {
		global $wpdb;

		$charset_collate = $wpdb->get_charset_collate();

		$sql = array();

		// Login history table
		$table_name_login = $wpdb->prefix . 'user_id_login_history';
		$sql[] = "CREATE TABLE $table_name_login (
			id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
			user_id bigint(20) unsigned NOT NULL,
			ip_address varchar(100) NOT NULL,
			user_agent text NOT NULL,
			login_time datetime DEFAULT CURRENT_TIMESTAMP NOT NULL,
			PRIMARY KEY  (id),
			KEY user_id (user_id)
		) $charset_collate;";

		// Activity log table
		$table_name_activity = $wpdb->prefix . 'user_id_activity';
		$sql[] = "CREATE TABLE $table_name_activity (
			id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
			user_id bigint(20) unsigned NOT NULL,
			event_type varchar(50) NOT NULL,
			event_details text NOT NULL,
			created_at datetime DEFAULT CURRENT_TIMESTAMP NOT NULL,
			PRIMARY KEY  (id),
			KEY user_id (user_id),
			KEY event_type (event_type)
		) $charset_collate;";

		require_once( trailingslashit( ABSPATH ) . 'wp-admin/includes/upgrade.php' );
		
		foreach ( $sql as $query ) {
			dbDelta( $query );
		}
		
		update_option( 'user_id_db_version', USER_ID_VERSION );
	}
}