<?php
/**
 * Main Configuration File
 * Patel E-Mitra & Aadhaar Seva Kendra CMS
 */

// Start session if not already started
if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

// Error reporting (set to 0 in production)
error_reporting(E_ALL);
ini_set('display_errors', 0);

// Timezone
date_default_timezone_set('Asia/Kolkata');

// Site Configuration
define('SITE_NAME', 'Patel E-Mitra & Aadhaar Seva Kendra');
define('SITE_URL', 'https://aadharsevakendra.in');  // Change to your domain
define('SITE_EMAIL', 'patelshop03@gmail.com');
define('SITE_PHONE', '+917014155018');

// Paths
define('BASE_PATH', dirname(dirname(__FILE__)));
define('ADMIN_PATH', BASE_PATH . '/admin');
define('UPLOAD_PATH', BASE_PATH . '/assets/uploads');
define('UPLOAD_URL', SITE_URL . '/assets/uploads');

// Upload settings
define('MAX_FILE_SIZE', 5242880); // 5MB
define('ALLOWED_IMAGE_TYPES', ['jpg', 'jpeg', 'png', 'gif', 'webp']);
define('ALLOWED_FILE_TYPES', ['pdf', 'doc', 'docx', 'xls', 'xlsx']);

// Pagination
define('ITEMS_PER_PAGE', 10);

// Include database configuration
require_once __DIR__ . '/database.php';
require_once __DIR__ . '/constants.php';

// Helper Functions
function redirect($url) {
    header("Location: $url");
    exit();
}

function sanitize($data) {
    return htmlspecialchars(strip_tags(trim($data)), ENT_QUOTES, 'UTF-8');
}

function generateToken($length = 32) {
    return bin2hex(random_bytes($length));
}

function verifyToken($token) {
    return isset($_SESSION['csrf_token']) && hash_equals($_SESSION['csrf_token'], $token);
}

function setFlashMessage($type, $message) {
    $_SESSION['flash_message'] = ['type' => $type, 'message' => $message];
}

function getFlashMessage() {
    if (isset($_SESSION['flash_message'])) {
        $flash = $_SESSION['flash_message'];
        unset($_SESSION['flash_message']);
        return $flash;
    }
    return null;
}

function isLoggedIn() {
    return isset($_SESSION['user_id']) && !empty($_SESSION['user_id']);
}

function getCurrentUser() {
    if (isLoggedIn()) {
        return [
            'id' => $_SESSION['user_id'],
            'username' => $_SESSION['username'],
            'email' => $_SESSION['email'],
            'full_name' => $_SESSION['full_name'],
            'role' => $_SESSION['role']
        ];
    }
    return null;
}

function requireLogin() {
    if (!isLoggedIn()) {
        redirect(SITE_URL . '/admin/login.php');
    }
}

function logActivity($action, $description = '') {
    $db = getDB();
    $user_id = isLoggedIn() ? $_SESSION['user_id'] : null;
    $ip_address = $_SERVER['REMOTE_ADDR'] ?? '';
    $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
    
    $stmt = $db->prepare("INSERT INTO activity_log (user_id, action, description, ip_address, user_agent) VALUES (?, ?, ?, ?, ?)");
    $stmt->execute([$user_id, $action, $description, $ip_address, $user_agent]);
}

function getSetting($key, $default = '') {
    static $settings = null;
    
    if ($settings === null) {
        $db = getDB();
        $stmt = $db->query("SELECT setting_key, setting_value FROM settings");
        $settings = [];
        while ($row = $stmt->fetch()) {
            $settings[$row['setting_key']] = $row['setting_value'];
        }
    }
    
    return isset($settings[$key]) ? $settings[$key] : $default;
}

function formatPrice($price) {
    if ($price === null || $price === '') {
        return 'Contact Us';
    }
    return '₹' . number_format($price, 2);
}

function formatDate($date, $format = 'd M Y') {
    return date($format, strtotime($date));
}

function formatDateTime($datetime, $format = 'd M Y h:i A') {
    return date($format, strtotime($datetime));
}

function generateSlug($string) {
    $slug = strtolower(trim(preg_replace('/[^A-Za-z0-9-]+/', '-', $string)));
    return $slug;
}

function uploadFile($file, $folder = '') {
    $upload_dir = UPLOAD_PATH;
    if ($folder) {
        $upload_dir .= '/' . $folder;
        if (!is_dir($upload_dir)) {
            mkdir($upload_dir, 0755, true);
        }
    }
    
    $file_name = time() . '_' . preg_replace('/[^a-zA-Z0-9._-]/', '', $file['name']);
    $file_path = $upload_dir . '/' . $file_name;
    
    if (move_uploaded_file($file['tmp_name'], $file_path)) {
        return [
            'success' => true,
            'path' => $folder ? $folder . '/' . $file_name : $file_name,
            'name' => $file_name,
            'size' => $file['size'],
            'type' => $file['type']
        ];
    }
    
    return ['success' => false, 'error' => 'File upload failed'];
}

function deleteFile($file_path) {
    $full_path = UPLOAD_PATH . '/' . $file_path;
    if (file_exists($full_path)) {
        return unlink($full_path);
    }
    return false;
}

function getFileSize($bytes) {
    $units = ['B', 'KB', 'MB', 'GB'];
    $i = 0;
    while ($bytes >= 1024 && $i < count($units) - 1) {
        $bytes /= 1024;
        $i++;
    }
    return round($bytes, 2) . ' ' . $units[$i];
}
?>