<?php

namespace Modules\Platform\Core\Helper;

/**
 * Resolves custom panel (section) titles saved through CRM Settings
 * (Settings → CRM Settings → * Fields) when the generic Html::section()
 * component renders a module's create / edit / show pages.
 *
 * Each module that exposes editable field panels registers its language
 * namespace → *FieldSettingsService mapping in config/crm_field_settings.php
 * ("panel_label_services").  Only panels with a saved custom title are
 * returned, so untouched modules and panels keep their existing behaviour.
 */
class PanelLabelResolver
{
    /** @var array<string, array<string,string>> service → [panelKey => title] */
    private static $resolved = [];

    /**
     * Return the saved custom title for a panel of a module, or null when the
     * module has no panel-label service / the panel was never customised.
     *
     * @param  string  $languageFile  module language namespace, e.g. "leads::leads"
     * @param  string  $panelName     panel key, e.g. "lead_information"
     * @return string|null
     */
    public static function overrideFor(string $languageFile, string $panelName)
    {
        $map = (array) config('crm_field_settings.panel_label_services', []);
        $serviceClass = $map[$languageFile] ?? null;

        if (!is_string($serviceClass) || !class_exists($serviceClass)) {
            return null;
        }

        if (!array_key_exists($serviceClass, self::$resolved)) {
            $user = auth()->user();
            self::$resolved[$serviceClass] = $user !== null
                ? app($serviceClass)->getPanelLabelOverrides($user)
                : [];
        }

        $overrides = self::$resolved[$serviceClass];

        if (array_key_exists($panelName, $overrides)) {
            $title = trim((string) $overrides[$panelName]);
            if ($title !== '') {
                return $title;
            }
        }

        return null;
    }
}