<?php
declare(strict_types=1);

namespace ROITheme\Public\AdsensePlacement\Infrastructure\Api\WordPress;

use ROITheme\Public\AdsensePlacement\Application\UseCases\CheckAdsenseVisibilityUseCase;
use ROITheme\Public\AdsensePlacement\Domain\ValueObjects\UserContext;
use WP_REST_Request;
use WP_REST_Response;

/**
 * REST Controller para el endpoint de visibilidad de AdSense.
 *
 * Infrastructure Layer - Maneja HTTP y traduce a/desde Domain.
 *
 * Endpoint: GET /wp-json/roi-theme/v1/adsense-placement/visibility
 *
 * @package ROITheme\Public\AdsensePlacement\Infrastructure\Api\WordPress
 */
final class AdsenseVisibilityController
{
    private const NAMESPACE = 'roi-theme/v1';
    private const ROUTE = '/adsense-placement/visibility';
    private const NONCE_ACTION = 'roi_adsense_visibility';

    public function __construct(
        private CheckAdsenseVisibilityUseCase $useCase
    ) {
    }

    /**
     * Registra la ruta REST del endpoint.
     */
    public function registerRoutes(): void
    {
        register_rest_route(self::NAMESPACE, self::ROUTE, [
            'methods' => 'GET',
            'callback' => [$this, 'handleRequest'],
            'permission_callback' => '__return_true',
            'args' => [
                'post_id' => [
                    'required' => true,
                    'type' => 'integer',
                    'sanitize_callback' => 'absint',
                    // IMPORTANTE: postId=0 es valido (paginas de archivo, home, etc.)
                    'validate_callback' => static fn($value): bool => $value >= 0,
                ],
                'nonce' => [
                    'required' => false,
                    'type' => 'string',
                    'sanitize_callback' => 'sanitize_text_field',
                ],
            ],
        ]);
    }

    /**
     * Maneja la peticion REST.
     */
    public function handleRequest(WP_REST_Request $request): WP_REST_Response
    {
        $this->sendNoCacheHeaders();

        // Validar nonce si se proporciona
        $nonce = $request->get_param('nonce');
        if ($nonce !== null && !wp_verify_nonce($nonce, self::NONCE_ACTION)) {
            return new WP_REST_Response([
                'show_ads' => false,
                'reasons' => ['invalid_nonce'],
                'cache_seconds' => 0,
                'timestamp' => time(),
            ], 403);
        }

        $postId = (int) $request->get_param('post_id');
        $userContext = $this->buildUserContext();

        $decision = $this->useCase->execute($postId, $userContext);

        // El timestamp se inyecta aqui (Infrastructure) para mantener Domain puro
        return new WP_REST_Response($decision->toArray(time()), 200);
    }

    /**
     * Construye UserContext desde el estado actual de WordPress.
     */
    private function buildUserContext(): UserContext
    {
        $isLoggedIn = is_user_logged_in();
        $userRoles = [];

        if ($isLoggedIn) {
            $user = wp_get_current_user();
            $userRoles = array_map(
                static fn(string $role): int => self::roleToId($role),
                $user->roles
            );
        }

        // isMobile se determina por el cliente, no el servidor
        // El cliente enviara esta info, pero por defecto asumimos false
        $isMobile = false;

        return new UserContext(
            isLoggedIn: $isLoggedIn,
            isMobile: $isMobile,
            userRoles: $userRoles
        );
    }

    /**
     * Convierte nombre de rol a ID numerico para consistencia.
     */
    private static function roleToId(string $role): int
    {
        $roleMap = [
            'administrator' => 1,
            'editor' => 2,
            'author' => 3,
            'contributor' => 4,
            'subscriber' => 5,
        ];

        return $roleMap[$role] ?? 0;
    }

    /**
     * Envia headers para prevenir cache en proxies/CDNs.
     */
    private function sendNoCacheHeaders(): void
    {
        header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
        header('Pragma: no-cache');
        header('Expires: Thu, 01 Jan 1970 00:00:00 GMT');
        header('Vary: Cookie');
    }

    /**
     * Obtiene la accion del nonce para generacion en frontend.
     */
    public static function getNonceAction(): string
    {
        return self::NONCE_ACTION;
    }
}