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<?php
class Question {
    private $id;
    private $text;
    private $created_at;
    
    public function __construct(array $data = []) {
        if (!empty($data)) {
            $this->id = $data['id'] ?? null;
            $this->text = $data['text'] ?? '';
            $this->created_at = $data['created_at'] ?? null;
        }
    }
    
    // Getters
    public function getId(): ?int { return $this->id; }
    public function getText(): string { return $this->text; }
    public function getCreatedAt(): ?string { return $this->created_at; }
    
    public function setText(string $text): void {
        $this->text = $text;
    }
    
    // CRUD operations
    public static function find(int $id): ?self {
        $pdo = Database::getInstance()->getConnection();
        $stmt = $pdo->prepare("SELECT * FROM questions WHERE id = :id");
        $stmt->execute([':id' => $id]);
        $data = $stmt->fetch();
        
        return $data ? new self($data) : null;
    }
    
    public static function getAll(): array {
        $pdo = Database::getInstance()->getConnection();
        $stmt = $pdo->query("SELECT * FROM questions ORDER BY id DESC");
        $questions = [];
        
        while ($data = $stmt->fetch()) {
            $questions[] = new self($data);
        }
        
        return $questions;
    }
    
    public function save(): bool {
        $pdo = Database::getInstance()->getConnection();
        
        if ($this->id) {
            $stmt = $pdo->prepare("UPDATE questions SET text = :text WHERE id = :id");
            return $stmt->execute([':text' => $this->text, ':id' => $this->id]);
        } else {
            $stmt = $pdo->prepare("INSERT INTO questions (text) VALUES (:text)");
            $result = $stmt->execute([':text' => $this->text]);
            
            if ($result) {
                $this->id = $pdo->lastInsertId();
            }
            
            return $result;
        }
    }
    
    public function delete(): bool {
        if (!$this->id) return false;
        
        $pdo = Database::getInstance()->getConnection();
        $stmt = $pdo->prepare("DELETE FROM questions WHERE id = :id");
        return $stmt->execute([':id' => $this->id]);
    }
    
    public static function create(string $text): bool {
        $question = new self(['text' => $text]);
        return $question->save();
    }
}

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