<?php
/**
 * NostolgaGram Configuration Hub v1.0
 * Architecture: InfinityFree Core Matrix + Cloudinary CDN Processing
 */

// 1. Universal Security and Client Handshake Headers
// Crucial for allowing old Android clients to connect without CORS errors
header('Content-Type: application/json; charset=utf-8');
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: GET, POST, OPTIONS, DELETE");
header("Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With");

// Handle preflight OPTIONS requests instantly before they reach feature files
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit;
}

// 2. Database Connectivity Profiles
// Swap these placeholders with your actual keys from your InfinityFree Client Area
define('DB_HOST', 'sql112.infinityfree.com'); 
define('DB_USER', 'if0_42261255');            
define('DB_PASS', '8d1WbfEonq'); 
define('DB_NAME', 'if0_42261255_nostolgagram');  

// 3. Cloudinary Edge CDN Credentials
// Swap with your actual cloud account name. The preset matches your unsigned configuration.
define('CLOUDINARY_CLOUD_NAME', 'dnkm8pijh'); 
define('CLOUDINARY_UPLOAD_PRESET', 'nostolgagram'); 

// 4. Global Managed Database Connection Gateway (PDO)
// This function can be safely executed by any file in your directory tree.
function getDB() {
    static $dbInstance = null;
    
    // Reuse existing connection if already established during the request lifecycle
    if ($dbInstance !== null) {
        return $dbInstance;
    }
    
    try {
        $dbInstance = new PDO(
            "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME . ";charset=utf8mb4", 
            DB_USER, 
            DB_PASS, 
            [
                PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES   => false,
            ]
        );
        return $dbInstance;
    } catch (PDOException $e) {
        // Return structured JSON instead of raw PHP syntax blocks if the database drops
        http_response_code(500);
        die(json_encode([
            "status" => "fail", 
            "message" => "Database node offline."
        ]));
    }
}