<?php

namespace App\Helpers;

use App\Contracts\TranslatableModel;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;

class TranslationHelper
{
    /**
     * Get all cached translations.
     *
     * @param string|null $locale
     * @return array
     */
    public static function getCachedTranslations(?string $locale = null): array
    {
        if (is_null($locale)) {
            $locale = app()->getLocale();
        }
        return Cache::remember(sprintf('translations_%s', app()->getLocale()), 86400, function () {
            $translator = App::make('translator');
            $property   = (new \ReflectionClass($translator))->getProperty('loaded');
            $property->setAccessible(true);
            return $property->getValue($translator);
        });
    }

    /**
     * Assert fallback locale translation is present.
     *
     * @param \App\Contracts\TranslatableModel $model
     * @return void
     * @throws \Illuminate\Validation\ValidationException Translations missing.
     */
    public static function validateFallbackTranslations(TranslatableModel $model): void
    {
        $localeFallback      = config('app.fallback_locale');
        $missingTranslations = [];
        foreach ($model->getTranslations() as $key => $value) {
            if (!is_null($model->{$key}) && !$model->hasTranslation($key, $localeFallback)) {
                $validationTranslations = self::getCachedTranslations()['validation'];
                $field                  = (array_key_exists($key, $validationTranslations['attributes']))
                    ? trans("validation.attributes.$key")
                    : trans("validation.custom.$key");
                $missingTranslations    = array_merge($missingTranslations, [
                    $key => trans_choice('back.missing_translations', 1, [
                        'field'   => $field,
                        'locales' => Str::upper($localeFallback),
                    ]),
                ]);
            }
        }
        if ($missingTranslations) {
            throw ValidationException::withMessages($missingTranslations);
        }
    }
}