<?php
/**
 * Plugin Name: Descomplicar JetEngine Bridge
 * Description: API Endpoint customizado para manipulação atómica de CCTs e Relações JetEngine.
 *              Expõe /descomplicar/v1/manage para integração com n8n e agentes IA.
 * Version: 1.1.0
 * Author: Descomplicar® Crescimento Digital
 * Author URI: https://descomplicar.pt
 *
 * Instalar em: /wp-content/mu-plugins/descomplicar-jet-bridge.php
 * Autenticação: WordPress Application Passwords
 */

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

class Descomplicar_Jet_Bridge {

    public function __construct() {
        add_action( 'rest_api_init', [ $this, 'register_routes' ] );
    }

    public function register_routes() {
        register_rest_route( 'descomplicar/v1', '/manage', [
            'methods'             => 'POST',
            'callback'            => [ $this, 'handle_request' ],
            'permission_callback' => function() {
                // Autenticar via WordPress Application Passwords no n8n:
                // Header: Authorization: Basic base64(user:app-password)
                return current_user_can( 'edit_posts' );
            },
        ]);
    }

    public function handle_request( WP_REST_Request $request ) {
        $params = $request->get_json_params();
        $action = sanitize_text_field( $params['action'] ?? '' );

        if ( ! function_exists( 'jet_engine' ) || ! class_exists( 'Jet_Engine' ) ) {
            return new WP_Error( 'no_jet_engine', 'JetEngine não está activo.', [ 'status' => 500 ] );
        }

        switch ( $action ) {
            case 'create_cct_item':
            case 'update_cct_item':
                return $this->handle_cct_write( $params );

            case 'get_cct_item':
                return $this->handle_cct_get( $params );

            case 'delete_cct_item':
                return $this->handle_cct_delete( $params );

            case 'manage_relation':
                return $this->handle_relation( $params );

            default:
                return new WP_Error(
                    'invalid_action',
                    'Acção inválida. Disponíveis: create_cct_item, update_cct_item, get_cct_item, delete_cct_item, manage_relation',
                    [ 'status' => 400 ]
                );
        }
    }

    /**
     * Criar ou actualizar item CCT
     *
     * Payload: {
     *   "action": "create_cct_item",
     *   "cct_slug": "faturas",
     *   "item_data": {
     *     "titulo": "Fatura #1024",
     *     "valor": 500,
     *     "estado": "pendente"
     *   }
     * }
     * Para update, incluir "_ID": 42 em item_data.
     */
    private function handle_cct_write( array $params ) {
        $cct_slug  = sanitize_key( $params['cct_slug'] ?? '' );
        $item_data = $params['item_data'] ?? [];

        if ( empty( $cct_slug ) ) {
            return new WP_Error( 'missing_slug', 'cct_slug é obrigatório.', [ 'status' => 400 ] );
        }

        if ( empty( $item_data ) ) {
            return new WP_Error( 'missing_data', 'item_data é obrigatório.', [ 'status' => 400 ] );
        }

        $handler = $this->get_cct_handler( $cct_slug );
        if ( is_wp_error( $handler ) ) return $handler;

        $result_id = $handler->update_item( $item_data );

        if ( ! $result_id ) {
            return new WP_Error( 'db_error', 'Falha ao guardar item na base de dados.', [ 'status' => 500 ] );
        }

        return rest_ensure_response( [
            'success' => true,
            'item_id' => $result_id,
            'action'  => isset( $item_data['_ID'] ) ? 'updated' : 'created',
        ] );
    }

    /**
     * Ler item CCT por ID
     *
     * Payload: { "action": "get_cct_item", "cct_slug": "faturas", "item_id": 42 }
     */
    private function handle_cct_get( array $params ) {
        $cct_slug = sanitize_key( $params['cct_slug'] ?? '' );
        $item_id  = absint( $params['item_id'] ?? 0 );

        if ( empty( $cct_slug ) || ! $item_id ) {
            return new WP_Error( 'missing_data', 'cct_slug e item_id são obrigatórios.', [ 'status' => 400 ] );
        }

        $handler = $this->get_cct_handler( $cct_slug );
        if ( is_wp_error( $handler ) ) return $handler;

        $item = $handler->get_item( $item_id );

        if ( ! $item ) {
            return new WP_Error( 'not_found', "Item {$item_id} não encontrado no CCT '{$cct_slug}'.", [ 'status' => 404 ] );
        }

        return rest_ensure_response( [
            'success' => true,
            'item'    => $item,
        ] );
    }

    /**
     * Eliminar item CCT
     *
     * Payload: { "action": "delete_cct_item", "cct_slug": "faturas", "item_id": 42 }
     */
    private function handle_cct_delete( array $params ) {
        $cct_slug = sanitize_key( $params['cct_slug'] ?? '' );
        $item_id  = absint( $params['item_id'] ?? 0 );

        if ( empty( $cct_slug ) || ! $item_id ) {
            return new WP_Error( 'missing_data', 'cct_slug e item_id são obrigatórios.', [ 'status' => 400 ] );
        }

        $handler = $this->get_cct_handler( $cct_slug );
        if ( is_wp_error( $handler ) ) return $handler;

        $result = $handler->delete_item( $item_id );

        return rest_ensure_response( [
            'success'  => (bool) $result,
            'item_id'  => $item_id,
            'deleted'  => (bool) $result,
        ] );
    }

    /**
     * Criar ou remover relação entre dois items
     *
     * Payload: {
     *   "action": "manage_relation",
     *   "rel_key": "clientes-projetos",
     *   "parent_id": 10,
     *   "child_id": 20,
     *   "connect": true
     * }
     */
    private function handle_relation( array $params ) {
        $rel_key   = sanitize_text_field( $params['rel_key'] ?? '' );
        $parent_id = absint( $params['parent_id'] ?? 0 );
        $child_id  = absint( $params['child_id'] ?? 0 );
        $connect   = (bool) ( $params['connect'] ?? true );

        if ( empty( $rel_key ) || ! $parent_id || ! $child_id ) {
            return new WP_Error(
                'missing_data',
                'rel_key, parent_id e child_id são obrigatórios.',
                [ 'status' => 400 ]
            );
        }

        if ( ! class_exists( '\Jet_Engine\Relations\Manager' ) ) {
            return new WP_Error( 'no_relations', 'Módulo de Relações JetEngine não disponível.', [ 'status' => 500 ] );
        }

        \Jet_Engine\Relations\Manager::get_instance()->process_relation(
            $rel_key,
            $parent_id,
            $child_id,
            $connect
        );

        return rest_ensure_response( [
            'success' => true,
            'action'  => $connect ? 'connected' : 'disconnected',
            'rel_key' => $rel_key,
            'parent'  => $parent_id,
            'child'   => $child_id,
        ] );
    }

    /**
     * Obter CCT handler com verificação de erro
     */
    private function get_cct_handler( string $cct_slug ) {
        $cct_module = jet_engine()->modules->get_module( 'custom-content-types' );

        if ( ! $cct_module ) {
            return new WP_Error( 'no_cct_module', 'Módulo CCT não está activo no JetEngine.', [ 'status' => 500 ] );
        }

        $manager = $cct_module->instance->manager;
        $type    = $manager->get_content_type_instance( $cct_slug );

        if ( ! $type ) {
            return new WP_Error( 'invalid_cct', "CCT '{$cct_slug}' não encontrado.", [ 'status' => 404 ] );
        }

        return $type->get_handler_instance();
    }
}

new Descomplicar_Jet_Bridge();