from datetime import datetime, timedelta
from typing import Optional
from jose import JWTError, jwt
from argon2 import PasswordHasher
from argon2.exceptions import VerifyMismatchError
from app.core.config import settings

# Usar Argon2 ao invés de Bcrypt
ph = PasswordHasher()

def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Verifica se a senha corresponde ao hash"""
    try:
        ph.verify(hashed_password, plain_password)
        return True
    except VerifyMismatchError:
        return False

def get_password_hash(password: str) -> str:
    """Gera hash da senha"""
    return ph.hash(password)

def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """Cria token JWT"""
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
    return encoded_jwt

def decode_access_token(token: str) -> Optional[dict]:
    """Decodifica token JWT"""
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
        return payload
    except JWTError:
        return None