<?php
defined( 'ABSPATH' ) || exit;

/**
 * Demand Registration Hook.
 *
 * A surface object (ticket, task, subscriber) is NOT automatically a
 * Demand. It exists operationally on its surface (Fluent Support, Fluent
 * Boards, FluentCRM) but is invisible to Asterion's trace/audit/closure
 * logic until explicitly registered.
 *
 * This class provides that registration. It writes an arbitration row
 * (the canonical first entry of a Demand lifecycle) through the surface
 * adapter — never via direct $wpdb access to surface tables.
 *
 * v1 surface: a single static method, callable from PHP. Future:
 * an admin UI button or REST endpoint can wrap this.
 *
 * Demand Registration Boundary (per doctrine):
 *   - Unregistered surface objects remain operational but do NOT
 *     participate in trace, audit, or closure logic.
 *   - They are referred to as "untracked demand candidates" until
 *     registered.
 */
class SA_Orch_Demand_Registry {

    /**
     * Register a surface object as an Asterion Demand.
     *
     * @param string $surface           Surface id (must have a registered adapter).
     * @param string $ref               Surface-specific ref (must validate via adapter).
     * @param string $rationale         Human-readable rationale for arbitration.
     * @param string $projection_type   Default 'scope-direct-no-plan'; see SA_Orch_Arbitration::write.
     * @param string $truth_class       Default 'canonical'.
     *
     * @return array|WP_Error  Arbitration row data on success; WP_Error on failure.
     */
    public static function register(
        string $surface,
        string $ref,
        string $rationale,
        string $projection_type = 'scope-direct-no-plan',
        string $truth_class = 'canonical'
    ) {
        $adapter = SA_Orch_Bridge_Fluent::adapter_for( $surface );
        if ( ! $adapter ) {
            return new WP_Error(
                'no_adapter',
                "No surface adapter registered for '{$surface}'."
            );
        }
        if ( ! $adapter->validate( $ref ) ) {
            return new WP_Error(
                'invalid_ref',
                "Ref '{$ref}' does not resolve under the '{$surface}' adapter."
            );
        }

        return SA_Orch_Arbitration::write( [
            'demand_surface'  => $surface,
            'demand_ref'      => $ref,
            'rationale'       => $rationale,
            'projection_type' => $projection_type,
            'truth_class'     => $truth_class,
        ] );
    }

    /**
     * Convenience: is this surface object already registered as a Demand?
     * Returns true if at least one arbitration exists for the (surface, ref) pair.
     */
    public static function is_registered( string $surface, string $ref ): bool {
        global $wpdb;
        $arb_table = $wpdb->prefix . SA_ORCH_DB_PREFIX . 'arbitration';
        $count = (int) $wpdb->get_var( $wpdb->prepare(
            "SELECT COUNT(*) FROM {$arb_table} WHERE demand_surface = %s AND demand_ref = %s",
            $surface, $ref
        ) );
        return $count > 0;
    }
}