<?php
namespace Relay\Admin;

use Relay\Support\SiteInfo;

final class Assets
{
    public const HANDLE = 'relay-app';

    private string $dir;
    private string $url;

    public function __construct(string $dir = RELAY_DIR, string $url = RELAY_URL)
    {
        $this->dir = trailingslashit($dir);
        $this->url = trailingslashit($url);
    }

    /** @return array{js: string, css: string[]}|null */
    public function entry(): ?array
    {
        $file = $this->dir . 'build/manifest.json';
        if (!is_readable($file)) {
            return null;
        }
        $manifest = json_decode((string) file_get_contents($file), true);
        if (!is_array($manifest)) {
            return null;
        }
        $js = null;
        $css = [];
        foreach ($manifest as $chunk) {
            if (!empty($chunk['isEntry']) && !empty($chunk['file'])) {
                $js = $chunk['file'];
                $css = array_merge($css, $chunk['css'] ?? []);
            } elseif (!empty($chunk['file']) && substr((string) $chunk['file'], -4) === '.css') {
                $css[] = $chunk['file']; // the one stylesheet of a classic-script build (cssCodeSplit off)
            }
        }
        if ($js === null) {
            return null;
        }
        return [
            'js' => $this->url . 'build/' . $js,
            'css' => array_map(fn ($file) => $this->url . 'build/' . $file, $css),
        ];
    }

    public function enqueue(): void
    {
        $entry = $this->entry();
        if ($entry === null) {
            return;
        }
        wp_enqueue_script(self::HANDLE, $entry['js'], ['react', 'react-dom', 'wp-i18n'], RELAY_VERSION, true); // WordPress' own React
        foreach ($entry['css'] as $i => $css) {
            wp_enqueue_style(self::HANDLE . '-' . $i, $css, [], RELAY_VERSION);
        }
        wp_add_inline_script(self::HANDLE, 'window.relayBoot = ' . wp_json_encode($this->boot_data()) . ';', 'before');
        wp_set_script_translations(self::HANDLE, 'siterelay', $this->dir . 'languages');
    }

    public function boot_data(): array
    {
        $user = wp_get_current_user();
        return [
            'restUrl' => esc_url_raw(rest_url('relay/v1/')),
            'nonce' => wp_create_nonce('wp_rest'),
            'version' => RELAY_VERSION,
            'adminUrl' => is_multisite() ? network_admin_url() : admin_url(),
            'loginUrl' => wp_login_url(Menu::url()),
            'siteName' => SiteInfo::plain_name(is_multisite() ? (string) get_network()->site_name : get_bloginfo('name')),
            'homeUrl' => is_multisite() ? network_home_url() : home_url(),
            'network' => is_multisite() ? ['subdomain' => is_subdomain_install()] : null,
            'user' => ['name' => $user->display_name],
        ];
    }
}