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<?php
/**
 * Database Configuration Class
 */

class Database {
    private static $instance = null;
    private $connection;
    
    // Database configuration from environment variables
    private $host;
    private $database;
    private $username;
    private $password;
    
    private function __construct() {
        $this->host = $_ENV['DB_HOST'] ?? 'database';
        $this->database = $_ENV['DB_NAME'] ?? 'api_db';
        $this->username = $_ENV['DB_USER'] ?? 'api_user';
        $this->password = $_ENV['DB_PASS'] ?? 'api_password';
        
        try {
            $dsn = "mysql:host={$this->host};dbname={$this->database};charset=utf8mb4";
            $this->connection = new PDO($dsn, $this->username, $this->password, [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false
            ]);
        } catch (PDOException $e) {
            throw new Exception("Database connection failed: " . $e->getMessage());
        }
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    public function getConnection() {
        return $this->connection;
    }
    
    // Prevent cloning
    private function __clone() {}
    
    // Prevent unserializing
    public function __wakeup() {
        throw new Exception("Cannot unserialize Database singleton");
    }
}

/**
 * Base API Response Class
 */
class ApiResponse {
    public static function success($data = null, $message = 'Success', $code = 200) {
        http_response_code($code);
        return json_encode([
            'success' => true,
            'message' => $message,
            'data' => $data,
            'timestamp' => date('Y-m-d H:i:s')
        ]);
    }
    
    public static function error($message = 'Error', $code = 400, $details = null) {
        http_response_code($code);
        return json_encode([
            'success' => false,
            'message' => $message,
            'details' => $details,
            'timestamp' => date('Y-m-d H:i:s')
        ]);
    }
}

/**
 * Request Validator Class
 */
class Validator {
    public static function validateEmail($email) {
        return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
    }
    
    public static function validateRequired($value) {
        return !empty(trim($value));
    }
    
    public static function validateNumeric($value) {
        return is_numeric($value);
    }
    
    public static function validateLength($value, $min = 0, $max = null) {
        $length = strlen(trim($value));
        if ($length < $min) return false;
        if ($max !== null && $length > $max) return false;
        return true;
    }
}

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