<?php
declare(strict_types=1);

namespace Operanse\Agent;

defined( 'ABSPATH' ) || exit;

use Operanse\Agent\Cron\Scheduler;

/** Pairing flow shared by the admin page and WP-CLI. */
final class Pairing {
	public function __construct( private Plugin $plugin ) {}

	/** @return array{ok:bool,error:string|null} */
	public function pair( string $token, ?string $api_url = null ): array {
		$token = trim( $token );
		if ( strlen( $token ) < 16 || strlen( $token ) > 128 ) {
			return array( 'ok' => false, 'error' => 'invalid_token_format' );
		}
		if ( $api_url !== null && $api_url !== '' ) {
			$this->plugin->settings()->set( 'api_url', rtrim( $api_url, '/' ) );
		}
		$res = $this->plugin->client()->post_unsigned(
			'/v1/agent/pair',
			array(
				'pairing_token'   => $token,
				'site_url'        => home_url( '/' ),
				'agent_version'   => OPERANSE_AGENT_VERSION,
				'wp_version'      => get_bloginfo( 'version' ),
				'php_version'     => PHP_VERSION,
				'inbound_capable' => $this->plugin->settings()->connection_mode() === Config\Settings::MODE_DIRECT_INBOUND,
			)
		);
		if ( ! $res['ok'] || ! is_array( $res['body'] ) ) {
			return array( 'ok' => false, 'error' => (string) ( $res['error'] ?? 'pairing_failed' ) );
		}
		$b = $res['body'];
		if ( ! isset( $b['site_id'], $b['environment_id'], $b['key_id'], $b['secret'] ) ) {
			return array( 'ok' => false, 'error' => 'malformed_response' );
		}
		// Nothing recorded before an administrator paired is sent after (ADR-072 §8, Q1): the spool starts empty.
		\Operanse\Agent\Telemetry\Spool\SpoolDrain::discard( $this->plugin->spool() );
		$this->plugin->credentials()->store( (string) $b['site_id'], (string) $b['environment_id'], (string) $b['key_id'], (string) $b['secret'] );
		if ( isset( $b['api_base_url'] ) && is_string( $b['api_base_url'] ) && $b['api_base_url'] !== '' ) {
			$this->plugin->settings()->set( 'api_url', rtrim( $b['api_base_url'], '/' ) );
		}
		if ( isset( $b['config'] ) && is_array( $b['config'] ) ) {
			$this->plugin->settings()->apply_remote_config( $b['config'] );
		}
		( new Scheduler( $this->plugin->settings() ) )->schedule_all();
		wp_schedule_single_event( time() + 5, Scheduler::HOOK_DISCOVER, array( 'pairing' ) );
		return array( 'ok' => true, 'error' => null );
	}
}