import ctypes
from ctypes import wintypes
import psutil
from typing import Optional, List, Dict
import sys
import os

# Agregar el directorio padre al path para importar config
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from config import MEMORY_SEARCH_CONFIG, UI_MESSAGES

# Constantes de Windows API
PROCESS_ALL_ACCESS = 0x1F0FFF
MEM_COMMIT = 0x1000
MEM_RESERVE = 0x2000
PAGE_EXECUTE_READWRITE = 0x40
PAGE_READWRITE = 0x04
PAGE_EXECUTE_READ = 0x20

# Definir MEMORY_BASIC_INFORMATION
class MEMORY_BASIC_INFORMATION(ctypes.Structure):
    _fields_ = [
        ("BaseAddress", ctypes.c_void_p),
        ("AllocationBase", ctypes.c_void_p),
        ("AllocationProtect", wintypes.DWORD),
        ("RegionSize", ctypes.c_size_t),
        ("State", wintypes.DWORD),
        ("Protect", wintypes.DWORD),
        ("Type", wintypes.DWORD)
    ]

# Cargar kernel32
kernel32 = ctypes.windll.kernel32

class MemoryManager:
    """Gestor de memoria para operaciones de lectura/escritura en procesos"""
    
    def __init__(self):
        self.process_name = None
        self.process_handle = None
        self.process_id = None
    
    def find_process(self) -> bool:
        """Encuentra el proceso por nombre"""
        try:
            for proc in psutil.process_iter(['pid', 'name']):
                if proc.info['name'].lower() == self.process_name.lower():
                    self.process_id = proc.info['pid']
                    return True
        except (psutil.NoSuchProcess, psutil.AccessDenied):
            pass
        return False
    
    def open_process(self, process_name: str) -> bool:
        """Abre el proceso para lectura/escritura"""
        self.process_name = process_name
        if not self.process_id:
            if not self.find_process():
                print(UI_MESSAGES['error']['process_not_found'].format(process_name=self.process_name))
                print("   Asegúrate de que el juego esté ejecutándose.")
                return False
        
        self.process_handle = kernel32.OpenProcess(
            PROCESS_ALL_ACCESS, False, self.process_id
        )
        
        if not self.process_handle:
            print(UI_MESSAGES['error']['process_not_opened'].format(process_name=self.process_name))
            print("   Ejecuta este programa como administrador.")
            return False
        
        print(UI_MESSAGES['success']['process_opened'].format(process_name=self.process_name, pid=self.process_id))
        return True
    
    def read_memory(self, address: int, size: int) -> Optional[bytes]:
        """Lee memoria del proceso"""
        buffer = ctypes.create_string_buffer(size)
        bytes_read = ctypes.c_size_t()
        
        success = kernel32.ReadProcessMemory(
            self.process_handle,
            ctypes.c_void_p(address),
            buffer,
            size,
            ctypes.byref(bytes_read)
        )
        
        if success:
            return buffer.raw[:bytes_read.value]
        return None
    
    def write_memory(self, address: int, data: bytes) -> bool:
        """Escribe memoria en el proceso"""
        # Cambiar protección de memoria
        old_protect = wintypes.DWORD()
        kernel32.VirtualProtectEx(
            self.process_handle,
            ctypes.c_void_p(address),
            len(data),
            PAGE_EXECUTE_READWRITE,
            ctypes.byref(old_protect)
        )
        
        bytes_written = ctypes.c_size_t()
        success = kernel32.WriteProcessMemory(
            self.process_handle,
            ctypes.c_void_p(address),
            data,
            len(data),
            ctypes.byref(bytes_written)
        )
        
        # Restaurar protección original
        kernel32.VirtualProtectEx(
            self.process_handle,
            ctypes.c_void_p(address),
            len(data),
            old_protect.value,
            ctypes.byref(old_protect)
        )
        
        return success and bytes_written.value == len(data)
    
    def get_memory_regions(self) -> List[Dict]:
        """Obtiene las regiones de memoria ejecutables del proceso"""
        regions = []
        address = 0
        
        while address < MEMORY_SEARCH_CONFIG['max_address']:
            mbi = MEMORY_BASIC_INFORMATION()
            size = kernel32.VirtualQueryEx(
                self.process_handle,
                ctypes.c_void_p(address),
                ctypes.byref(mbi),
                ctypes.sizeof(mbi)
            )
            
            if size == 0:
                break
            
            if mbi.BaseAddress is None or mbi.RegionSize is None:
                address += 0x1000
                continue
            
            # Solo regiones ejecutables
            if (mbi.State == MEM_COMMIT and 
                mbi.Protect in [PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE]):
                regions.append({
                    'base': mbi.BaseAddress,
                    'size': mbi.RegionSize,
                    'protect': mbi.Protect
                })
            
            address = mbi.BaseAddress + mbi.RegionSize
        
        return regions
    
    def close_process(self):
        """Cierra el handle del proceso"""
        if self.process_handle:
            kernel32.CloseHandle(self.process_handle)
            self.process_handle = None