"""
安全模組：JWT 認證與密碼雜湊
"""
from datetime import datetime, timedelta
from typing import Optional

from jose import JWTError, jwt
from passlib.context import CryptContext

from app.core.config import settings

# 密碼雜湊上下文
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


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


def get_password_hash(password: str) -> str:
    """產生密碼雜湊"""
    return pwd_context.hash(password)


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """
    建立 Access Token

    Args:
        data: Token 內容 (通常包含 sub: user_id)
        expires_delta: 過期時間

    Returns:
        JWT Token 字串
    """
    to_encode = data.copy()

    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)

    to_encode.update({"exp": expire, "type": "access"})
    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)

    return encoded_jwt


def create_refresh_token(data: dict) -> str:
    """
    建立 Refresh Token

    Args:
        data: Token 內容

    Returns:
        JWT Token 字串
    """
    to_encode = data.copy()
    expire = datetime.utcnow() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)

    to_encode.update({"exp": expire, "type": "refresh"})
    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)

    return encoded_jwt


def decode_token(token: str) -> Optional[dict]:
    """
    解碼 Token

    Args:
        token: JWT Token 字串

    Returns:
        Token 內容或 None (解碼失敗)
    """
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
        return payload
    except JWTError:
        return None