"""
Auth module — JWT + bcrypt (inspired by usememos/memos)
"""
import os
import datetime
import jwt
import bcrypt

# ── Config ──
SECRET_KEY = os.getenv("AUTH_SECRET_KEY", "canifa-dashboard-secret-2024-change-me")
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 1440  # 24 hours — internal dashboard


# ── Password ──
def hash_password(plain: str) -> str:
    return bcrypt.hashpw(plain.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")


def verify_password(plain: str, hashed: str) -> bool:
    return bcrypt.checkpw(plain.encode("utf-8"), hashed.encode("utf-8"))


# ── JWT ──
def create_access_token(user_id: int, username: str, role: str = "admin") -> str:
    expire = datetime.datetime.utcnow() + datetime.timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    payload = {
        "sub": str(user_id),
        "username": username,
        "role": role,
        "exp": expire,
    }
    return jwt.encode(payload, SECRET_KEY, algorithm=ALGORITHM)


def decode_access_token(token: str) -> dict:
    """Decode and validate JWT. Raises jwt.ExpiredSignatureError or jwt.InvalidTokenError."""
    return jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
