"""
JWT 签发与校验 + 密码哈希工具
"""

from datetime import datetime, timedelta, timezone

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

from app.core.config import settings

# ── 密码哈希 ──────────────────────────────────────────────
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


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


def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)


# ── JWT Token ─────────────────────────────────────────────
def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
    to_encode = data.copy()
    expire = datetime.now(timezone.utc) + (
        expires_delta or timedelta(minutes=settings.JWT_ACCESS_TOKEN_EXPIRE_MINUTES)
    )
    to_encode.update({"exp": expire})
    return jwt.encode(
        to_encode,
        settings.JWT_SECRET_KEY,
        algorithm=settings.JWT_ALGORITHM,
    )


def decode_access_token(token: str) -> dict | None:
    """解析 JWT，失败返回 None"""
    try:
        payload = jwt.decode(
            token,
            settings.JWT_SECRET_KEY,
            algorithms=[settings.JWT_ALGORITHM],
        )
        return payload
    except JWTError:
        return None