<?php

namespace App\Komma\Kiyoh;

use App\Komma\Base\Service;
use App\Komma\Kiyoh\Models\Review;
use Illuminate\Database\Eloquent\Collection;

final class KiyohService extends Service
{
    private static $reviewsByLocations;

    public function __construct()
    {
        parent::__construct();
        if (! self::$reviewsByLocations) {
            self::$reviewsByLocations = Review::select('rating', 'location_id')->get()->groupBy('location_id');
        }
    }

    /**
     * @param int $locationId
     * @return object
     */
    public function getScoreForLocation(int $locationId)
    {
        $reviewsForLocation = self::$reviewsByLocations->get($locationId);
        if (! isset($reviewsForLocation)) {
            return null;
        }

        $averageNumber = round($reviewsForLocation->avg('rating'), 1) ?? 9.4;
        $totalReviews = $reviewsForLocation->count() ?? 100;
        $stars = $this->kiyohReviewStarsObject($averageNumber);

        return (object) ['averageNumber' => $averageNumber, 'totalReviews' => $totalReviews, 'stars' => $stars];
    }

    /**
     * @return object
     */
    public function getTotalScore()
    {
        $averageNumber = round(self::$reviewsByLocations->flatten()->avg('rating'), 1) ?? 9.4;
        $totalReviews = self::$reviewsByLocations->flatten()->count() ?? 1409;
        $stars = $this->kiyohReviewStarsObject($averageNumber);

        return (object) ['averageNumber' => $averageNumber, 'totalReviews' => $totalReviews, 'stars' => $stars];
    }

    /**
     * @param int $rating
     * @param int $limit
     * @return Collection
     */
    public function getLastReviews(int $rating = 8, int $limit = 48): Collection
    {
        return Review::where('rating', '>=', $rating)
            ->orderBy('created_at', 'desc')
            ->take($limit)
            ->get();
    }

    public function kiyohReviewStarsObject($rating)
    {
        $fullStars = intval(floor($rating / 2));
        $halfStar = ($rating - (2 * $fullStars)) > 0 ? 1 : 0;
        $emptyStars = 5 - $fullStars - $halfStar;

        return (object) ['full' => $fullStars, 'half' => $halfStar, 'empty' => $emptyStars];
    }
}