import bcrypt
from datetime import datetime, timedelta, timezone
from typing import Any, Union, Optional
from jose import jwt
from app.core.config import settings

ALGORITHM = "HS256"

def create_access_token(
    subject: Union[str, Any], 
    role: str,
    full_name: str,
    expires_delta: Optional[timedelta] = None
) -> str:
    if expires_delta:
        expire = datetime.now(timezone.utc) + expires_delta
    else:
        expire = datetime.now(timezone.utc) + timedelta(minutes=1440)
    
    to_encode = {
        "exp": expire, 
        "sub": str(subject), 
        "role": role,
        "full_name": full_name
    }
    encoded_jwt = jwt.encode(to_encode, settings.secret_key, algorithm=ALGORITHM)
    return encoded_jwt

def verify_password(plain_password: str, hashed_password: str) -> bool:
    return bcrypt.checkpw(
        plain_password.encode('utf-8'), 
        hashed_password.encode('utf-8')
    )

def get_password_hash(password: str) -> str:
    return bcrypt.hashpw(
        password.encode('utf-8'), 
        bcrypt.gensalt()
    ).decode('utf-8')

def get_token_payload(token: str) -> dict:
    try:
        payload = jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])
        return payload
    except Exception:
        return {}