package security
import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"crypto/sha256"
	"encoding/base64"
	"errors"
	"fmt"
	"io"
	"runtime"
	"unsafe"
)
type MemoryProtector struct {
	protectedRegions map[uintptr]uint64
}
func NewMemoryProtector() *MemoryProtector {
	return &MemoryProtector{
		protectedRegions: make(map[uintptr]uint64),
	}
}
func (p *MemoryProtector) ProtectMemoryRegion(address uintptr, size uint64) error {
	
	p.protectedRegions[address] = size
	return nil
}
func (p *MemoryProtector) UnprotectMemoryRegion(address uintptr) error {
	
	delete(p.protectedRegions, address)
	return nil
}
func (p *MemoryProtector) EncryptMemoryRegion(address uintptr, size uint64, key []byte) error {
	
	data := make([]byte, size)
	for i := uint64(0); i < size; i++ {
		data[i] = *(*byte)(unsafe.Pointer(address + uintptr(i)))
	}
	
	encryptedData, err := encryptAES(data, key)
	if err != nil {
		return fmt.Errorf("failed to encrypt memory region: %v", err)
	}
	
	for i := uint64(0); i < size && i < uint64(len(encryptedData)); i++ {
		*(*byte)(unsafe.Pointer(address + uintptr(i))) = encryptedData[i]
	}
	return nil
}
func (p *MemoryProtector) DecryptMemoryRegion(address uintptr, size uint64, key []byte) error {
	
	data := make([]byte, size)
	for i := uint64(0); i < size; i++ {
		data[i] = *(*byte)(unsafe.Pointer(address + uintptr(i)))
	}
	
	decryptedData, err := decryptAES(data, key)
	if err != nil {
		return fmt.Errorf("failed to decrypt memory region: %v", err)
	}
	
	for i := uint64(0); i < size && i < uint64(len(decryptedData)); i++ {
		*(*byte)(unsafe.Pointer(address + uintptr(i))) = decryptedData[i]
	}
	return nil
}
func (p *MemoryProtector) LockMemoryRegion(address uintptr, size uint64) error {
	if runtime.GOOS == "windows" {
		return p.lockMemoryRegionWindows(address, size)
	} else {
		return p.lockMemoryRegionUnix(address, size)
	}
}
func (p *MemoryProtector) lockMemoryRegionWindows(address uintptr, size uint64) error {
	
	
	return nil
}
func (p *MemoryProtector) lockMemoryRegionUnix(address uintptr, size uint64) error {
	
	
	return nil
}
func (p *MemoryProtector) UnlockMemoryRegion(address uintptr, size uint64) error {
	if runtime.GOOS == "windows" {
		return p.unlockMemoryRegionWindows(address, size)
	} else {
		return p.unlockMemoryRegionUnix(address, size)
	}
}
func (p *MemoryProtector) unlockMemoryRegionWindows(address uintptr, size uint64) error {
	
	
	return nil
}
func (p *MemoryProtector) unlockMemoryRegionUnix(address uintptr, size uint64) error {
	
	
	return nil
}
func (p *MemoryProtector) SecureZeroMemory(address uintptr, size uint64) error {
	
	for i := uint64(0); i < size; i++ {
		*(*byte)(unsafe.Pointer(address + uintptr(i))) = 0
	}
	return nil
}
func encryptAES(plaintext, key []byte) ([]byte, error) {
	
	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}
	
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return nil, err
	}
	
	nonce := make([]byte, gcm.NonceSize())
	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
		return nil, err
	}
	
	ciphertext := gcm.Seal(nonce, nonce, plaintext, nil)
	return ciphertext, nil
}
func decryptAES(ciphertext, key []byte) ([]byte, error) {
	
	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}
	
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return nil, err
	}
	
	nonceSize := gcm.NonceSize()
	if len(ciphertext) < nonceSize {
		return nil, errors.New("ciphertext too short")
	}
	
	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
	
	plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
	if err != nil {
		return nil, err
	}
	return plaintext, nil
}
func deriveKey(password string) []byte {
	
	hash := sha256.Sum256([]byte(password))
	return hash[:]
}
func encodeBase64(data []byte) string {
	return base64.StdEncoding.EncodeToString(data)
}
func decodeBase64(encoded string) ([]byte, error) {
	return base64.StdEncoding.DecodeString(encoded)
}
