<?php
/**
 * Front-end asset registration from the build manifest.
 *
 * Script/style handles are versioned by content hash. When the manifest or
 * dist files are absent (source checkout), registration is a no-op so the
 * site never 404s on missing assets.
 *
 * @package EmbodiedAssistant
 */

namespace EmbodiedAssistant;

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

class Assets {

    const MANIFEST = 'assets/dist/manifest.json';
    const HANDLE = 'embodied-assistant';

    /** @var array|null */
    private static $manifest = null;

    /**
     * Enqueue the component entry when this request renders the element
     * (shortcode/block context detected via Embed).
     *
     * @param array $context {mode?, label?}
     */
    public static function register(array $context = array()) {
        $manifest = self::manifest();
        if (empty($manifest['main'])) {
            return;
        }

        $main = $manifest['main'];
        $mtime = filemtime(EMBODIED_ASSISTANT_DIR . 'assets/dist/' . $main);
        $version = $mtime ? (string) $mtime : EMBODIED_ASSISTANT_VERSION;

        // Core 7.1's abilities module uses these classic-script globals.
        wp_enqueue_script('wp-data');
        wp_enqueue_script('wp-i18n');

        wp_register_script_module(self::HANDLE,
            EMBODIED_ASSISTANT_URL . 'assets/admission-loader.js',
            array(array('id' => '@wordpress/abilities', 'import' => 'dynamic')),
            $version, array('in_footer' => true));

        // Minimal config injected on the page (public, no secrets).
        $config = array(
            'endpoint' => esc_url_raw(rest_url('embodied-assistant/v1')),
            'admissionUrl' => esc_url_raw(admin_url('admin-ajax.php')),
            'entryUrl' => esc_url_raw(add_query_arg('ver', $version, EMBODIED_ASSISTANT_URL . 'assets/dist/' . $main)),
            'mode'     => isset($context['mode']) ? sanitize_key($context['mode']) : 'default',
        );
        add_filter('script_module_data_' . self::HANDLE, static function () use ($config) { return $config; });

        wp_enqueue_script_module(self::HANDLE);

        // The component injects its own shadow-DOM styles; the plugin only
        // styles the mount container (sizing) via a tiny inline block style
        // added by Embed, so no stylesheet round trip is needed for the bot.
        if (!empty($manifest['style'])) {
            wp_register_style(self::HANDLE, EMBODIED_ASSISTANT_URL . 'assets/dist/' . $manifest['style'], array(), $version);
            wp_enqueue_style(self::HANDLE);
        }
    }

    /**
     * Parse the build manifest (id → hashed file path).
     *
     * @return array {main: string, style: string}
     */
    public static function manifest() {
        if (null !== self::$manifest) {
            return self::$manifest;
        }
        self::$manifest = array('main' => '', 'style' => '');
        $path = EMBODIED_ASSISTANT_DIR . self::MANIFEST;
        if (!is_readable($path)) {
            return self::$manifest;
        }
        $decoded = json_decode((string) file_get_contents($path), true);
        if (!is_array($decoded)) {
            return self::$manifest;
        }
        if (!empty($decoded['embodied-assistant.js'])) {
            self::$manifest['main'] = ltrim((string) $decoded['embodied-assistant.js'], '/');
        }
        if (!empty($decoded['index.css'])) {
            self::$manifest['style'] = ltrim((string) $decoded['index.css'], '/');
        }
        return self::$manifest;
    }

}