# core/security.py
from passlib.context import CryptContext
from datetime import datetime, timedelta
from typing import Optional
#
import os
import jwt
import logging


logger = logging.getLogger(__name__)

# Configuración de hashing de contraseñas
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

# Configuración de JWT
SECRET_KEY = os.getenv("SECRET_KEY", "xma-secret-key-change-in-production")
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_HOURS = int(os.getenv("ACCESS_TOKEN_EXPIRE_HOURS", "1"))


def get_password_hash(password: str) -> str:
    """Genera hash de contraseña con bcrypt"""

    if password.startswith("$2b$") or password.startswith("$2a$"):
        raise ValueError("La contrasena ya esta hasheada")
    
    password_bytes = password.encode('utf-8')
    if len(password_bytes) > 72:
        password = password[:72]

    return pwd_context.hash(password)


def verify_password(plain_password: str, hashed_password: str) -> bool:
    try:
        return pwd_context.verify(plain_password, hashed_password)
    except Exception as e:
        logger.error(f"Error verifying password: {e}")
        return False


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


def decode_access_token(token: str) -> dict:
    """Decodifica token JWT"""
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        return payload
    except jwt.ExpiredSignatureError:
        raise ValueError("Token expirado")
    except jwt.InvalidTokenError:
        raise ValueError("Token inválido")