<?php
/**
 * Database Configuration
 * TPU Survey System
 */

define('DB_HOST', 'localhost');
define('DB_NAME', 'tpu_survey_v2');
define('DB_USER', 'root');
define('DB_PASS', '');
define('DB_CHARSET', 'utf8mb4');

function getDB() {
    static $pdo = null;
    if ($pdo === null) {
        try {
            $dsn = "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME . ";charset=" . DB_CHARSET;
            $pdo = new PDO($dsn, DB_USER, DB_PASS, [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false
            ]);
        } catch (PDOException $e) {
            http_response_code(500);
            echo json_encode(['error' => 'Database connection failed: ' . $e->getMessage()]);
            exit;
        }
    }
    return $pdo;
}

function jsonResponse($data, $code = 200) {
    http_response_code($code);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode($data, JSON_UNESCAPED_UNICODE);
    exit;
}

function getInput() {
    $json = file_get_contents('php://input');
    return json_decode($json, true) ?: [];
}