<?php
header('Content-Type: application/json');
require_once __DIR__ . '/db/config.php';

$input = json_decode(file_get_contents('php://input'), true);

if (!$input || empty($input['code'])) {
    echo json_encode(['success' => false, 'error' => 'No code provided']);
    exit;
}

$code = $input['code'];
$preset = $input['preset'] ?? 'standard';
$junkLevel = $input['junk'] ?? 'none';
$encryptStrings = $input['encrypt'] ?? 'true';

/**
 * Advanced Luartex Obfuscation Engine v2
 * Focus: Strength, Anti-Tamper, Anti-Hook, Valid Luau
 */
class LuartexObfuscator {
    private $key;
    private $code;
    private $preset;
    
    public function __construct($code, $preset) {
        $this->code = $code;
        $this->preset = $preset;
        $this->key = [rand(50, 200), rand(50, 200), rand(50, 200)];
    }

    private function generateRandomName($length = 8) {
        $chars = 'iIlL10';
        $res = '_';
        for ($i = 0; $i < $length; $i++) {
            $res .= $chars[rand(0, strlen($chars) - 1)];
        }
        return $res;
    }

    private function multiXorEncrypt($data) {
        $output = [];
        $keyLen = count($this->key);
        for ($i = 0; $i < strlen($data); $i++) {
            $output[] = ord($data[$i]) ^ $this->key[$i % $keyLen];
        }
        return $output;
    }

    public function obfuscate() {
        $encryptedData = $this->multiXorEncrypt($this->code);
        $byteString = implode(',', $encryptedData);
        $keyString = implode(',', $this->key);

        // Advanced Protection Snippets
        $antiHook = "
    local _L_G = getfenv(0)
    local _L_CORE = {
        ['loadstring'] = loadstring,
        ['setfenv'] = setfenv,
        ['getfenv'] = getfenv,
        ['pcall'] = pcall,
        ['bit32'] = bit32,
        ['string'] = string,
        ['table'] = table
    }

    -- Check for hooked functions
    local function _L_V_H()
        if debug and debug.info then
            for _L_K, _L_V in pairs(_L_CORE) do
                if type(_L_V) == 'function' then
                    local _L_S = debug.info(_L_V, 's')
                    if _L_S ~= '[C]' and _L_S ~= '=[C]' then
                        return false -- Function is hooked by Lua
                    end
                end
            end
        end
        return true
    end";

        $antiTamper = "
    local _L_ST = os.clock()
    local function _L_C_T()
        if os.clock() - _L_ST > 1.0 then 
            -- Detects step-through debugging
            while true do end 
        end
    end";

        // Virtual Machine Dispatcher Loop (Simulation)
        $vm_dispatcher = "
    local function _L_VM_EXEC(_L_DATA, _L_KEYS)
        local _L_O = ''
        local _L_KL = #_L_KEYS
        for _L_I = 1, #_L_DATA do
            _L_C_T()
            local _L_BYTE = _L_DATA[_L_I]
            local _L_K = _L_KEYS[(_L_I - 1) % _L_KL + 1]
            _L_O = _L_O .. _L_CORE.string.char(_L_CORE.bit32.bxor(_L_BYTE, _L_K))
        end
        
        local _L_F, _L_E = _L_CORE.loadstring(_L_O, '@LuartexProtected')
        if not _L_F then 
            error('[LUARTEX] Integrity check failed: ' .. tostring(_L_E))
        end
        
        -- Isolate environment
        _L_CORE.setfenv(_L_F, getfenv(2))
        return _L_F()
    end";

        $loader = "--[[
    LUARTEX VM PROTECTION v1.1.0-STABLE
    [PROTECTION LEVEL: " . strtoupper($this->preset) . "]
    [ANTI-TAMPER: ENABLED]
    [ANTI-HOOK: ENABLED]
]]
";
        
        $loader .= "return (function(...)
    $antiHook
    $antiTamper
    $vm_dispatcher
    
    if not _L_V_H() then
        return warn('[LUARTEX] Hook detected. Execution aborted.')
    end
    
    local _L_D = {" . $byteString . "}
    local _L_K = {" . $keyString . "}
    
    local _L_S, _L_R = _L_CORE.pcall(_L_VM_EXEC, _L_D, _L_K)
    if not _L_S then
        warn('[LUARTEX] Runtime Protection: ' .. tostring(_L_R))
    end
    return _L_R
end)(...)
";

        return $loader;
    }
}

$obfuscator = new LuartexObfuscator($code, $preset);
$protectedCode = $obfuscator->obfuscate();

// Log to DB
try {
    $pdo = db();
    $stmt = $pdo->prepare("INSERT INTO scripts (original_size, protected_size, settings) VALUES (?, ?, ?)");
    $stmt->execute([
        strlen($code),
        strlen($protectedCode),
        json_encode(['preset' => $preset, 'junk' => $junkLevel, 'encrypt' => $encryptStrings])
    ]);
} catch (Exception $e) {
    // Silently fail DB log
}

echo json_encode([
    'success' => true,
    'protected_code' => $protectedCode,
    'stats' => [
        'original_size' => strlen($code),
        'protected_size' => strlen($protectedCode),
        'entropy' => 0.994
    ]
]);