<?php

declare(strict_types=1);

namespace App\Providers;

use App\Lib\Helpers\ToolboxHelper;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\File;
use Illuminate\Support\ServiceProvider;
use Symfony\Component\Finder\SplFileInfo;

class TranslationServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     */
    public function boot(): void
    {
        if ($this->app->runningInConsole() && ! $this->app->runningUnitTests()) {
            return;
        }

        foreach ($this->collectLocalesStrings() as $locale) {
            // * Suported locales.
            Cache::rememberForever(sprintf('translations.%s', $locale), function () use ($locale) {
                $phpTransFallback  = $this->phpTranslations(config()->string('app.fallback_locale'));
                $phpTransLocale    = $this->phpTranslations($locale);
                $jsonTransFallback = $this->jsonTranslations(config()->string('app.fallback_locale'));
                $jsonTransLocale   = $this->jsonTranslations($locale);

                return [
                    'php' => ToolboxHelper::arrayMergeRecursiveDistinct(
                        $phpTransFallback,
                        $phpTransLocale,
                    ),
                    'json' => ToolboxHelper::arrayMergeRecursiveDistinct(
                        $jsonTransFallback,
                        $jsonTransLocale,
                    ),
                ];
            });
        } // End foreach.
    }

    /**
     * Gather provided langs checking from files.
     *
     * @return \Illuminate\Support\Collection<array-key,string>
     */
    private function collectLocalesStrings(): Collection
    {
        // * En dur dans ->keys array<int,string>.
        /** @var array<int,string> */
        $locales = config('app.locales', []);
        $files   = File::allFiles(base_path('lang/'));

        return Collection::make($files)->flatMap(function (SplFileInfo $file) {
            if ($file->getRelativePath() && ! str_starts_with($file->getRelativePath(), 'vendor')) {
                return [$file->getRelativePath() => ''];
            }
        })->keys()->merge($locales);
    }

    /**
     * Gather all php translations.
     *
     * @return array<string, string>
     */
    private function phpTranslations(string $locale): array
    {
        $path = base_path("lang/$locale");

        if (! File::exists($path) || ! File::isReadable($path)) {
            return [];
        }

        $files = File::allFiles($path);

        return Collection::make($files)->flatMap(function ($file) use ($locale) {
            $translation = $file->getBasename('.php');

            return [$translation => trans($translation, [], $locale)];
        })->all();
    }

    /**
     * Gather json translations.
     *
     * @return array<string,mixed>
     */
    private function jsonTranslations(string $locale): array
    {
        $path = base_path("lang/$locale.json");

        if (! File::exists($path) || ! File::isReadable($path)) {
            return [];
        }

        return Arr::wrap(json_decode(File::get($path), true));
    }
}