<?php

namespace Modules\Language\Services;

use App\Services\MediaService;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Lang;
use Modules\Language\Models\Language;
use Modules\Language\Models\LanguageProperty;
use Exception;

class LanguageService extends MediaService
{
   public string $cacheKey;
   protected array $groupNames = ['auth', 'button', 'common', 'dashboard', 'frontend', 'input', 'settings', 'table'];

   public function __construct(Request $request)
   {
      $this->cacheKey = 'language_properties';
   }

   function storeLanguage($data)
   {
      $langPath = base_path('lang');
      $langDir = $langPath . "/" . $data['code'];
      $appLangPath = storage_path('app/lang/default');


      $language = Language::create($data);
      $this->syncLanguagePropertiesFromFiles($language);

      $alreadyExists = is_dir($langDir);

      if (! $alreadyExists) {
         File::makeDirectory($langDir, 0777, true, true);
         File::copyDirectory($appLangPath, $langDir);
      }
   }

   function updateLanguage($id, $data)
   {
      Language::find($id)->update($data);
   }

   public function syncLanguageFromFiles(string $locale): void
   {
      $language = Language::where('code', $locale)->first();

      if (! $language) {
         return;
      }

      $this->syncLanguagePropertiesFromFiles($language);
      $this->forgetLanguageCache($locale);
   }

   protected function loadLanguageGroup(string $locale, string $groupName): array
   {
      $defaultGroupPath = storage_path("app/lang/groups/{$groupName}.php");
      $defaultGroups = file_exists($defaultGroupPath) ? require $defaultGroupPath : [];

      $repoGroupPath = base_path("lang/{$locale}/groups/{$groupName}.php");
      if (file_exists($repoGroupPath)) {
         return require $repoGroupPath;
      }

      $flatFilePath = base_path("lang/{$locale}/{$groupName}.php");
      if (file_exists($flatFilePath)) {
         $flatTranslations = require $flatFilePath;
         return $this->mergeFlatTranslations($defaultGroups, $flatTranslations, $groupName);
      }

      return $defaultGroups;
   }

   protected function mergeFlatTranslations(array $defaultGroups, array $flatTranslations, string $groupName): array
   {
      if (empty($defaultGroups)) {
         return [[
            'name' => ucfirst(str_replace('_', ' ', $groupName)),
            'slug' => $groupName,
            'properties' => $flatTranslations,
         ]];
      }

      $groups = [];

      foreach ($defaultGroups as $group) {
         $properties = [];
         foreach ($group['properties'] as $key => $value) {
            if (array_key_exists($key, $flatTranslations)) {
               $properties[$key] = $flatTranslations[$key];
               unset($flatTranslations[$key]);
            } else {
               $properties[$key] = $value;
            }
         }

         $groups[] = [
            ...$group,
            'properties' => $properties,
         ];
      }

      if (! empty($flatTranslations)) {
         $groups[] = [
            'name' => ucfirst(str_replace('_', ' ', $groupName)) . ' Extra',
            'slug' => "{$groupName}_extra",
            'properties' => $flatTranslations,
         ];
      }

      return $groups;
   }

   protected function syncLanguagePropertiesFromFiles(Language $language): void
   {
      foreach ($this->groupNames as $groupName) {
         $groups = $this->loadLanguageGroup($language->code, $groupName);

         foreach ($groups as $group) {
            LanguageProperty::updateOrCreate(
               [
                  'language_id' => $language->id,
                  'group' => $groupName,
                  'slug' => $group['slug'],
               ],
               [
                  'name' => $group['name'],
                  'properties' => $group['properties'],
               ]
            );
         }
      }
   }

   function defaultLanguage($id)
   {
      Language::where('is_default', true)->update(['is_default' => false]);
      Language::where('id', $id)->update(['is_default' => true]);
   }

   protected function getCacheKey(string $locale): string
   {
      return "{$this->cacheKey}_{$locale}";
   }

   public function forgetLanguageCache(string $locale): void
   {
      Cache::forget($this->getCacheKey($locale));
   }

   protected function getDefaultLocale(): string
   {
      $default = Language::where('is_default', true)->value('code');

      if ($default) {
         return $default;
      }

      return config('app.locale', 'en');
   }

   protected function buildTranslationsFromFiles(string $locale): array
   {
      $langPath = lang_path($locale);

      if (! is_dir($langPath)) {
         return [];
      }

      $translations = [];

      foreach (File::allFiles($langPath) as $file) {
         if ($file->getExtension() !== 'php') {
            continue;
         }

         $group = $file->getFilenameWithoutExtension();
         $values = require $file->getPathname();

         foreach (Arr::dot($values) as $key => $value) {
            $translations[$group . '.' . $key] = $value;
         }
      }

      return $translations;
   }

   function setLanguageProperties(string $locale): void
   {
      $cacheKey = $this->getCacheKey($locale);

      $cached = Cache::rememberForever($cacheKey, function () use ($locale) {
         $language = Language::where('code', $locale)
            ->with('properties')
            ->first();

         if (! $language) {
            return [];
         }

         $groups = [];
         foreach ($language->properties as $property) {
            $groups[$property->group] = array_merge($groups[$property->group] ?? [], $property->properties);
         }

         $translations = [];
         foreach ($groups as $group => $properties) {
            foreach ($properties as $key => $value) {
               $translations[$group . '.' . $key] = $value;
            }
         }

         return $translations;
      });

      if (empty($cached)) {
         $cached = $this->buildTranslationsFromFiles($locale);
      }

      Lang::addLines($cached, $locale);
   }

   function deleteLanguage($id)
   {
      $lang = Language::find($id);
      $langPath = base_path('lang');
      $langDir = $langPath . "/" . $lang->code;

      if ($lang->is_default) {
         throw new Exception("Default language can't be deleted");
      }

      if (is_dir($langDir)) {
         File::deleteDirectory($langDir);
      }

      $lang->delete();
   }
}