from datetime import datetime, timedelta
from typing import Optional
from jose import JWTError, jwt
from app.config import settings

def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """JWT Access Token 생성"""
    to_encode = data.copy()
    
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=settings.JWT_ACCESS_TOKEN_EXPIRE_MINUTES)
    
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
    return encoded_jwt

def create_refresh_token(data: dict) -> str:
    """JWT Refresh Token 생성"""
    to_encode = data.copy()
    expire = datetime.utcnow() + timedelta(days=settings.JWT_REFRESH_TOKEN_EXPIRE_DAYS)
    to_encode.update({"exp": expire, "type": "refresh"})
    encoded_jwt = jwt.encode(to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
    return encoded_jwt

def decode_token(token: str) -> Optional[dict]:
    """JWT 토큰 디코드"""
    try:
        payload = jwt.decode(token, settings.JWT_SECRET_KEY, algorithms=[settings.JWT_ALGORITHM])
        return payload
    except JWTError:
        return None

def verify_token(token: str) -> bool:
    """토큰 유효성 검증"""
    payload = decode_token(token)
    return payload is not None