timebank-cc-public/app/Http/Controllers/PostController.php

<?php

namespace App\Http\Controllers;

use App\Models\Language;
use App\Models\Post;
use App\Models\PostTranslation;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Auth;

class PostController extends Controller
{

    public function showById($id)
    {
        $post =
            Post::with([
            'postable' => function ($query) {
                $query->select(['id', 'name']);
            },
            'category' => function ($query) {
                $query->with('translations');
            },
            'translations' => function ($query) {
                $query
                ->where('locale', App::getLocale());
                // ->whereDate('from', '<=', now())    //TODO: Exclude date queries ONLY for post Admins!
                // ->where( function($query) {
                //     $query->whereDate('till', '>', now())->orWhereNull('till');
                // })
            },
            ])
            ->where('id', $id)
            ->firstOrFail();

        if ($post->media) {
            $media = Post::find($id)->getFirstMedia('posts');
        }

        if ($post->translations->count() >= 1) {

            if ($post->category->translations) {
                $category =  $post->category->translations->where('locale', App::getLocale())->first()->name;
            }

            $update = Carbon::createFromTimeStamp(strtotime($post->translations->first()->updated_at))->isoFormat('LL');

        } else {
            // No translation in current locale - check for fallback translations
            return $this->handleNoTranslation($post, $id);
        }

        // Use guest layout for non-authenticated users, app layout for authenticated users
        $viewName = Auth::check() ? 'posts.show' : 'posts.show-guest';
        return ($post != null ? view($viewName, compact(['post','media','category','update'])) : abort(403));
    }

    /**
     * Handle case when no translation exists for current locale.
     * Check for available translations in other locales and offer fallback.
     */
    private function handleNoTranslation($post, $postId)
    {
        // Get all available translations for this post (active ones)
        $availableTranslation = PostTranslation::where('post_id', $postId)
            ->whereDate('from', '<=', now())
            ->where(function ($query) {
                $query->whereDate('till', '>', now())->orWhereNull('till');
            })
            ->first();

        $viewData = [
            'fallbackLocale' => null,
            'fallbackLanguageName' => null,
            'fallbackUrl' => null,
            'post' => $post,
        ];

        if ($availableTranslation) {
            // Found an available translation in another locale
            $fallbackLocale = $availableTranslation->locale;
            $fallbackLanguageName = Language::where('lang_code', $fallbackLocale)->first()->name ?? $fallbackLocale;

            // Generate URL to the same post in the fallback locale
            $fallbackUrl = \LaravelLocalization::getLocalizedURL($fallbackLocale, route('post.show', ['id' => $postId]));

            $viewData['fallbackLocale'] = $fallbackLocale;
            $viewData['fallbackLanguageName'] = __($fallbackLanguageName);
            $viewData['fallbackUrl'] = $fallbackUrl;
        }

        // Use guest layout for non-authenticated users, app layout for authenticated users
        $viewName = Auth::check() ? 'posts.no_translation' : 'posts.no_translation-guest';
        return view($viewName, $viewData);
    }

    /**
     * Show view by .../posts/{slug}.
     * Post will be shown in user's App:locale() language if available, even is the slug is in another language.
     *
     * @param  mixed $slug
     * @return void
     */
    public function showBySlug($slug)
    {
        $postTranslation = PostTranslation::where('slug', $slug)->get()->first();
        if (!$postTranslation) {
            return view('posts.not_found');
        }
        $id = $postTranslation->post_id;
        $locale = $postTranslation->locale;

        $post = Post::with([
            'postable' => function ($query) {
                $query->select(['id', 'name']);
            },
            'category' => function ($query) {
                $query->with('translations');
            },
            'meeting',
            'translations' => function ($query) {
                //TODO!: Currently only user 1 (Super-admin) can view unpublished posts, change to permission/role based!
                $query->where('locale', App::getLocale());
                // Only show published posts for guests and non-admin users
                if (!Auth::guard('web')->check() || Auth::guard('web')->user()->id != 1) {
                    $query->whereDate('from', '<=', now())
                        ->where(function ($query) {
                            $query->whereDate('till', '>', now())->orWhereNull('till');
                        });
                }
            }
        ])
        ->where('id', $id)
        ->first();


        if ($post->media) {
            $media = Post::find($id)->getFirstMedia('posts');
        }


        if ($post->translations->count() >= 1) {
            if ($post->category->translations) {
                $category =  $post->category->translations->where('locale', App::getLocale())->first()->name;
            }

            $update = Carbon::createFromTimeStamp(strtotime($post->translations->first()->updated_at))->isoFormat('LL');

        } else {
            // No translation in current locale - check for fallback translations
            return $this->handleNoTranslation($post, $id);
        }

        // Use guest layout for non-authenticated users, app layout for authenticated users
        $viewName = Auth::check() ? 'posts.show' : 'posts.show-guest';
        return ($post != null ? view($viewName, compact(['post','media','category','update'])) : abort(403));

    }


    public function manage()
    {
        if (getActiveProfileType() !== 'Admin') {
            abort(403, __('Admin profile required'));
        }

        return view('posts.manage');
    }


    public function notFound()
    {
        return view('posts.not_found');
    }
}