<?php
// includes/system_guard.php

// 1. --- SECURITY & FINGERPRINTING (Runs on every page load) ---
function track_visitor($conn) {
    // A. Get Real IP
    $ip = $_SERVER['REMOTE_ADDR'];
    if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
        $ip = $_SERVER['HTTP_CF_CONNECTING_IP'];
    } elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    }

    $uid = isset($_SESSION['user_id']) ? $_SESSION['user_id'] : 0;
    $agent = $_SERVER['HTTP_USER_AGENT'] ?? 'Unknown';
    
    // B. Detect Device Type (Mobile/Tablet/Desktop)
    $device_type = 'Desktop';
    if (preg_match('/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i', $agent) || preg_match('/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i', substr($agent, 0, 4))) {
        $device_type = 'Mobile';
    }

    // C. Create Deep Scan Fingerprint (Hash of IP + UserAgent + Language)
    // This helps detect if multiple accounts use the exact same device/network setup
    $fingerprint = hash('sha256', $ip . $agent . ($_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? ''));

    // D. Update Database with Deep Scan Data
    if ($uid > 0) {
        $update = $conn->prepare("UPDATE player_profiles SET last_ip = ?, last_device = ?, device_type = ?, fingerprint_hash = ?, last_scan_at = NOW() WHERE user_id = ?");
        $update->bind_param("ssssi", $ip, $agent, $device_type, $fingerprint, $uid);
        $update->execute();
        
        // AUTO-RISK: If same fingerprint found on OTHER users, flag high risk
        /*
        $check_dupe = $conn->query("SELECT COUNT(*) FROM player_profiles WHERE fingerprint_hash='$fingerprint' AND user_id != $uid");
        if($check_dupe->fetch_row()[0] > 0) {
            $conn->query("UPDATE player_profiles SET risk_score = 90 WHERE user_id = $uid");
        }
        */
    }
}

// 2. --- 90-DAY CACHE SYSTEM ---
function start_cache_system($user_specific = true) {
    $cache_duration = 1 * 24 * 60 * 60; // 1 Days
    $cache_folder = __DIR__ . '/../cache/';
    
    if (!is_dir($cache_folder)) { mkdir($cache_folder, 0777, true); }

    $uid_key = $user_specific && isset($_SESSION['user_id']) ? 'user_' . $_SESSION['user_id'] : 'guest';
    $page_key = md5($_SERVER['REQUEST_URI']); 
    $cache_file = $cache_folder . "page_{$uid_key}_{$page_key}.html";

    if (file_exists($cache_file) && (time() - filemtime($cache_file) < $cache_duration)) {
        readfile($cache_file);
        echo "";
        exit();
    }

    ob_start();
    return $cache_file;
}

function save_cache_system($cache_file) {
    $content = ob_get_contents();
    file_put_contents($cache_file, $content);
    ob_end_flush();
}

// 3. --- HELPER: CLEAR CACHE ---
function clear_user_cache($user_id) {
    $cache_folder = __DIR__ . '/../cache/';
    $files = glob($cache_folder . "page_user_{$user_id}_*.html");
    foreach ($files as $file) {
        if (is_file($file)) unlink($file);
    }
}
?>