from datetime import datetime, timedelta, timezone
from typing import Optional

import bcrypt
import jwt

from app.core.config import settings


def hash_password(password: str) -> str:
    return bcrypt.hashpw(password.encode(), bcrypt.gensalt()).decode()


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


def create_admin_token(user_id: str, tenant_id: str, role: str) -> str:
    payload = {
        "sub": user_id,
        "tenant_id": tenant_id,
        "role": role,
        "type": "admin_user",
        "exp": datetime.now(timezone.utc) + timedelta(hours=settings.JWT_EXPIRE_HOURS),
    }
    return jwt.encode(payload, settings.SECRET_KEY, algorithm="HS256")


def create_system_token(sys_admin_id: str) -> str:
    payload = {
        "sub": sys_admin_id,
        "tenant_id": None,
        "role": "system",
        "type": "system_admin",
        "exp": datetime.now(timezone.utc) + timedelta(hours=settings.JWT_EXPIRE_HOURS),
    }
    return jwt.encode(payload, settings.SECRET_KEY, algorithm="HS256")


def decode_token(token: str) -> Optional[dict]:
    try:
        return jwt.decode(token, settings.SECRET_KEY, algorithms=["HS256"])
    except Exception:
        return None