// parse the token and extract user data from it
const setUserDataAction = token => {
    return async dispatch => {
        try {
            const { id, fullname, exp } = await jwt_decode(token);
            return dispatch({ type: SET_USER_DATA, payload: { id, fullname, exp } });
        } catch (e) {
            console.log(e);  // InvalidTokenError
            await dispatch(setAlertAction('warning', 'Something went wrong, please try again later'));
            return dispatch({ type: LOGIN_FAIL });
        }
    };
};

export const checkAuthTokenAction = () => {
    return async dispatch => {
        try {
            const token = await localStorage.getItem('AUTH_JWT');
            const now = Math.floor(+Date.now()/1000);
            if(token) {
                const { exp } = await jwt_decode(token);
                // token is valid if exp > now
                if(exp > now) {
                    await dispatch(setUserDataAction(token));
                }
            }
        } catch (e) {
            console.log(e);
        }
    };
};

export const renewAuthTokenAction = () => {  // runs 5 minutes after app is launched
    return async dispatch => {
        try {
            const jwt = await localStorage.getItem('AUTH_JWT');
            const now = Math.floor(+Date.now()/1000);
            if(jwt) {
                const { exp } = await jwt_decode(jwt);
                if(exp > now) {
                    // renew token while exp > now
                    const { data } = await axios.post(`${RENEW_AUTH_TOKEN_URL}`, JSON.stringify({ token: jwt }), httpHeaders);
                    const { token } = data;
                    localStorage.setItem('AUTH_JWT', token);
                    return dispatch(setUserDataAction(token));
                }
            }
        } catch (e) {
            console.log(e);
        }
    };
};