import gc
import sys
import ctypes
import mmap

class MemoryProtection:
    def __init__(self):
        self._protected_regions = []
        self._secure_allocations = {}
    
    def secure_allocate(self, size, identifier):
        try:
            buffer = mmap.mmap(-1, size)
            self._secure_allocations[identifier] = buffer
            return buffer
        except:
            return None
    
    def secure_write(self, identifier, data):
        if identifier not in self._secure_allocations:
            return False
        
        try:
            buffer = self._secure_allocations[identifier]
            buffer.seek(0)
            buffer.write(data if isinstance(data, bytes) else data.encode())
            return True
        except:
            return False
    
    def secure_read(self, identifier):
        if identifier not in self._secure_allocations:
            return None
        
        try:
            buffer = self._secure_allocations[identifier]
            buffer.seek(0)
            return buffer.read()
        except:
            return None
    
    def secure_erase(self, identifier):
        if identifier not in self._secure_allocations:
            return False
        
        try:
            buffer = self._secure_allocations[identifier]
            size = buffer.size()
            buffer.seek(0)
            buffer.write(b'\x00' * size)
            buffer.close()
            del self._secure_allocations[identifier]
            return True
        except:
            return False
    
    def clear_sensitive_variables(self, *var_names):
        frame = sys._getframe(1)
        
        for var_name in var_names:
            if var_name in frame.f_locals:
                if isinstance(frame.f_locals[var_name], str):
                    frame.f_locals[var_name] = '\x00' * len(frame.f_locals[var_name])
                elif isinstance(frame.f_locals[var_name], bytes):
                    frame.f_locals[var_name] = b'\x00' * len(frame.f_locals[var_name])
                else:
                    frame.f_locals[var_name] = None
        
        gc.collect()
    
    def protect_string(self, string):
        if not isinstance(string, str):
            string = str(string)
        
        class ProtectedString:
            def __init__(self, value):
                self._value = value
                self._hash = hash(value)
            
            def __str__(self):
                return '*' * len(self._value)
            
            def __repr__(self):
                return f"ProtectedString({len(self._value)} chars)"
            
            def reveal(self):
                if hash(self._value) != self._hash:
                    raise ValueError("String integrity compromised")
                return self._value
            
            def __del__(self):
                self._value = '\x00' * len(self._value)
        
        return ProtectedString(string)
    
    def disable_core_dumps(self):
        try:
            import resource
            resource.setrlimit(resource.RLIMIT_CORE, (0, 0))
            return True
        except:
            return False
    
    def lock_memory(self):
        try:
            import resource
            max_mem = resource.getrlimit(resource.RLIMIT_AS)[0]
            if max_mem > 0:
                ctypes.CDLL(None).mlockall(1)
                return True
        except:
            pass
        
        return False
    
    def detect_memory_dump(self):
        try:
            if sys.platform == 'linux':
                with open(f'/proc/{os.getpid()}/status', 'r') as f:
                    for line in f:
                        if line.startswith('TracerPid:'):
                            if int(line.split()[1]) != 0:
                                return True
        except:
            pass
        
        return False
    
    def obfuscate_stack(self):
        dummy_data = [os.urandom(1024) for _ in range(100)]
        gc.collect()
        return len(dummy_data)
