<?php

namespace App\Services;

use Illuminate\Support\Collection;
use Kreait\Firebase\Factory;
use Kreait\Firebase\Database;

class FirebaseQuestionService
{
    protected Database $database;

    public function __construct()
    {
        $credentialsPath = (string) config('services.firebase.credentials');
        $databaseUrl = config('services.firebase.database_url');

        if (!$credentialsPath || !file_exists($credentialsPath)) {
            throw new \RuntimeException('Firebase credentials file not found.');
        }

        $factory = (new Factory())->withServiceAccount($credentialsPath);

        if (!empty($databaseUrl)) {
            $factory = $factory->withDatabaseUri($databaseUrl);
        }

        $this->database = $factory->createDatabase();
    }

    public function getQuestions(string $eventId, string $sessionId): Collection
    {
        $path = sprintf('events/%s/sessions/%s/questions', $eventId, $sessionId);

        $value = $this->database->getReference($path)->getValue();

        if (!is_array($value)) {
            return collect();
        }

        return collect($value)
            ->map(function ($item, $key) {
                if (is_array($item)) {
                    $item['firebase_key'] = $item['firebase_key'] ?? $key;
                    return $item;
                }

                return [
                    'firebase_key' => $key,
                    'question' => $item,
                ];
            })
            ->values();
    }

    public function getTopQuestions(string $eventId, string $sessionId, int $limit = 5): Collection
    {
        return $this->sortQuestions($this->getQuestions($eventId, $sessionId))
            ->take($limit)
            ->values();
    }

    public function sortQuestions(Collection $questions): Collection
    {
        return $questions
            ->sort(function ($a, $b) {
                $aScore = $this->score($a);
                $bScore = $this->score($b);

                if ($aScore === $bScore) {
                    return $this->timestamp($b) <=> $this->timestamp($a);
                }

                return $bScore <=> $aScore;
            })
            ->values();
    }

    protected function score(array $item): int
    {
        $candidates = [
            $item['likes'] ?? null,
            $item['upvotes'] ?? null,
            $item['votes'] ?? null,
            $item['score'] ?? null,
        ];

        foreach ($candidates as $candidate) {
            if (is_numeric($candidate)) {
                return (int) $candidate;
            }
        }

        return 0;
    }

    protected function timestamp(array $item): int
    {
        $raw = $item['created_at'] ?? $item['createdAt'] ?? null;

        if (is_numeric($raw)) {
            return (int) $raw;
        }

        if (is_string($raw)) {
            $parsed = strtotime($raw);
            if ($parsed !== false) {
                return $parsed;
            }
        }

        return 0;
    }
}

<?php

namespace App\Services;

use Illuminate\Support\Collection;
use Kreait\Firebase\Factory;
use Kreait\Firebase\Database;

class FirebaseQuestionService
{
    protected Database $database;

    public function __construct()
    {
        $credentialsPath = (string) config('services.firebase.credentials');
        $databaseUrl = config('services.firebase.database_url');

        if (!$credentialsPath || !file_exists($credentialsPath)) {
            throw new \RuntimeException('Firebase credentials file not found.');
        }

        $factory = (new Factory())->withServiceAccount($credentialsPath);

        if (!empty($databaseUrl)) {
            $factory = $factory->withDatabaseUri($databaseUrl);
        }

        $this->database = $factory->createDatabase();
    }

    public function getQuestions(string $eventId, string $sessionId): Collection
    {
        $path = sprintf('events/%s/sessions/%s/questions', $eventId, $sessionId);

        $value = $this->database->getReference($path)->getValue();

        if (!is_array($value)) {
            return collect();
        }

        return collect($value)
            ->map(function ($item, $key) {
                if (is_array($item)) {
                    $item['firebase_key'] = $item['firebase_key'] ?? $key;
                    return $item;
                }

                return [
                    'firebase_key' => $key,
                    'question' => $item,
                ];
            })
            ->values();
    }

    public function getTopQuestions(string $eventId, string $sessionId, int $limit = 5): Collection
    {
        return $this->sortQuestions($this->getQuestions($eventId, $sessionId))
            ->take($limit)
            ->values();
    }

    public function sortQuestions(Collection $questions): Collection
    {
        return $questions
            ->sort(function ($a, $b) {
                $aScore = $this->score($a);
                $bScore = $this->score($b);

                if ($aScore === $bScore) {
                    return $this->timestamp($b) <=> $this->timestamp($a);
                }

                return $bScore <=> $aScore;
            })
            ->values();
    }

    protected function score(array $item): int
    {
        $candidates = [
            $item['likes'] ?? null,
            $item['upvotes'] ?? null,
            $item['votes'] ?? null,
            $item['score'] ?? null,
        ];

        foreach ($candidates as $candidate) {
            if (is_numeric($candidate)) {
                return (int) $candidate;
            }
        }

        return 0;
    }

    protected function timestamp(array $item): int
    {
        $raw = $item['created_at'] ?? $item['createdAt'] ?? null;

        if (is_numeric($raw)) {
            return (int) $raw;
        }

        if (is_string($raw)) {
            $parsed = strtotime($raw);
            if ($parsed !== false) {
                return $parsed;
            }
        }

        return 0;
    }
}