import hashlib
import uuid
from datetime import timedelta
from typing import Any

from jose import jwt
from passlib.context import CryptContext

from app.config import settings
from app.utils import utcnow

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

ALGORITHM = "HS256"


def hash_password(password: str) -> str:
    return pwd_context.hash(password)


def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)


def create_access_token(data: dict[str, Any]) -> str:
    to_encode = data.copy()
    to_encode["exp"] = utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)


def create_refresh_token(data: dict[str, Any]) -> str:
    to_encode = data.copy()
    to_encode["exp"] = utcnow() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
    # jti ensures each token is unique even when issued for the same user at the same time
    to_encode["jti"] = str(uuid.uuid4())
    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)


def decode_token(token: str) -> dict[str, Any]:
    """Decode and verify a JWT token. Raises jose.JWTError on failure."""
    return jwt.decode(token, settings.SECRET_KEY, algorithms=[ALGORITHM])


def hash_token(token: str) -> str:
    """Return SHA-256 hex digest of a token for safe storage."""
    return hashlib.sha256(token.encode()).hexdigest()