<?php


namespace App\KommaApp\Posts;


use App\KommaApp\Posts\Models\Post;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Pagination\LengthAwarePaginator;

class PostService
{
    private $today;

    /**
     * PostService constructor.
     */
    public function __construct()
    {
        $this->today = Carbon::now()->addHour();
        $this->today = $this->today->format('Y-m-d H:i:s');
    }

    /**
     * Get all posts from the database
     *
     * @param bool $pagination
     * @param int $itemsPerPage
     * @return Collection
     */
    public function all($pagination = true, $itemsPerPage = 9)
    {
        $posts = \App::getSite()
            ->posts()
            ->with('translation', 'images', 'categories')
            ->where('active', 1)
            ->where('date', '<=', $this->today)
            ->orderBy('date','desc')
            ->orderBy('created_at', 'desc');

        if($pagination) return $posts->paginate($itemsPerPage);

        return $posts->get();
    }

    /**
     * Get all non-featured posts from a Collection|LengthAwarePaginator
     *
     * @param Collection|LengthAwarePaginator $posts
     * @return Collection
     */
    public function nonFeatured($posts)
    {
        return $posts->where('featured',0);
    }

    /**
     * Get all featured posts from a Collection|LengthAwarePaginator
     *
     * @param Collection|LengthAwarePaginator $posts
     * @return Collection
     */
    public function featured($posts)
    {
        return $posts->where('featured',1)
                     ->take(3);
    }

    /**
     * @param Post $post
     * @return \Illuminate\Support\Collection
     */
    public function relatedPosts(Post $post)
    {
        // Create collection to return
        $relatedPosts = collect();

        // Get categories from post which we will relate to
        $categories = $post->categories;

        // Loop through categories
        foreach($categories as $category)
        {
            $postsInCategory = Post::with('translation','categories')->whereHas('categories', function($query) use($category)
            {
                $query->where('categories.id', $category->id);
            })->get();

            // Merge related posts with posts in category
            $relatedPosts = $relatedPosts->merge($postsInCategory);
        }

        // Make sure the collection doesn't contain duplicates
        $relatedPosts = $relatedPosts->unique()->take(3);

        $relatedPosts = $relatedPosts->keyBy('id');

        return $relatedPosts->forget($post->id);
    }
}