from datetime import datetime, timedelta, timezone
from uuid import UUID

import jwt
from argon2 import PasswordHasher
from argon2.exceptions import VerifyMismatchError

from app.core.config import get_settings

_hasher = PasswordHasher()


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


def verify_password(password: str, hashed: str) -> bool:
    try:
        return _hasher.verify(hashed, password)
    except VerifyMismatchError:
        return False


def create_access_token(user_id: UUID) -> str:
    settings = get_settings()
    expires_at = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
    payload = {"sub": str(user_id), "exp": expires_at}
    return jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)


def decode_access_token(token: str) -> UUID | None:
    settings = get_settings()
    try:
        payload = jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
    except jwt.InvalidTokenError:
        return None
    subject = payload.get("sub")
    if subject is None:
        return None
    return UUID(subject)