auth.provider.tsx

import { AuthServiceLoginApiArg, AuthServiceLoginApiResponse, useAuthServiceLoginMutation } from "@api/api";
import { getCookieValue } from "@helper/coookie";
import { BasicProp } from "@helper/interfaces";
import { useAppDispatch, useAppSelector } from "@hooks";
import { DEVICE_URL, LOGIN_URL } from "@routes";
import { jwtDecode } from "jwt-decode";
import { createContext, useContext, useEffect, useMemo } from "react";
import { useNavigate } from "react-router-dom";
import { setToken } from "../reducer/user.reducer";

interface AuthProviderType {
    login: (username: string, password: string) => void,
    logout: () => void,
    // todo figure out the type of loginProperties
    loginProperties: any,
    isAuthenticated: () => boolean
}

const AuthContext = createContext<AuthProviderType>({
    login: () => { throw new Error("login function not implemented"); },
    logout: () => { throw new Error("logout function not implemented"); },
    loginProperties: undefined,
    isAuthenticated: () => { throw new Error("login function not implemented"); },
});

export const AuthProvider: React.FC<BasicProp> = ({ children }) => {
    const dispatch = useAppDispatch()
    const navigate = useNavigate()
    const { username } = useAppSelector(state => state.user)

    useEffect(() => {
        const token = getCookieValue('token');

        if (!token) {
            navigate(LOGIN_URL)
        }

    }, [username, navigate]);

    const [
        sendLogin,
        loginProperties,
    ] = useAuthServiceLoginMutation()


    /**
     * Returns the /login payload 
     */
    const getAuthPayload = (username: string, password: string): AuthServiceLoginApiArg => {
        const payload: AuthServiceLoginApiArg = {
            rbacLoginRequest: {
                username,
                pwd: password,
                timestamp: new Date().getTime().toString(),
            },
        }

        return payload;
    }

    const executeLogin = (username: string, password: string) => {
        const authPayload = getAuthPayload(username, password);

        sendLogin(authPayload).unwrap().then((response: AuthServiceLoginApiResponse) => {
            if (!response.token) {
                // reset the action by calling the reset hook
                throw Error("Response is successful but no token was provided. Expected response {token: '<jwt-token>'}");
            }

            dispatch(setToken({ token: response.token, username }));
            navigate(DEVICE_URL);
        }).catch(() => {
            // determine whether 500 or 401 err
        });
    }

    const isAuthenticated = () => {
        const token = getCookieValue('token');
        if (!token) {
            return false;
        }

        const { exp } = jwtDecode(token);
        const currentTime = new Date().getTime() / 1000;

        // TODO this is currently a workaround for the never expiring token
        if (process.env.NODE_ENV === 'development') {
            return !!token;
        } else {
            return !!token && exp! > currentTime;
        }
    }

    const logout = () => {
        dispatch(setToken(null));
        // TODO: purge other information
    }

    const value = useMemo<AuthProviderType>(
        () => ({
            login: executeLogin,
            logout,
            isAuthenticated,
            loginProperties
        }),
        [executeLogin, loginProperties, logout]
    );

    return (
        <AuthContext.Provider value={value}>
            {children}
        </AuthContext.Provider>
    )
}

export const useAuth = () => {
    return useContext(AuthContext);
}