<?php

namespace WooOrderCart\Front\LocalPickup;

use Automattic\WooCommerce\StoreApi\Schemas\V1\CartSchema;

final class LocalPickupStoreApiExtension {
    private static ?self $instance = null;
    private bool $registered = false;

    public static function instance(): self {
        return self::$instance ??= new self();
    }

    private function __construct() {
        add_action( 'woocommerce_blocks_loaded', [ $this, 'register' ] );
        add_action( 'init', [ $this, 'register' ], 20 );
    }

    public function register(): void {
        if ( $this->registered || ! function_exists( 'woocommerce_store_api_register_endpoint_data' ) ) {
            return;
        }

        woocommerce_store_api_register_endpoint_data( [
            'endpoint' => CartSchema::IDENTIFIER,
            'namespace' => 'ips-order-cart',
            'data_callback' => [ $this, 'data' ],
            'schema_callback' => [ $this, 'schema' ],
            'schema_type' => ARRAY_A,
        ] );
        $this->registered = true;
    }

    public function data(): array {
        return [ 'pickup' => LocalPickupResolver::build_checkout_payload() ];
    }

    public function schema(): array {
        return [ 'pickup' => [
            'description' => 'Current IPS pickup locations and selection for this cart.',
            'type' => 'object',
            'context' => [ 'view', 'edit' ],
            'readonly' => true,
            'properties' => [
                'available' => [ 'type' => 'boolean' ],
                'selectedLocationId' => [ 'type' => 'integer' ],
                'selectionInvalid' => [ 'type' => 'boolean' ],
                'locations' => [ 'type' => 'array', 'items' => [ 'type' => 'object' ] ],
            ],
        ] ];
    }
}