interface TokenResponse {
	token: string | null | undefined;
}

interface TokenBody {
	token: string;
	iat: number;
	exp: number;
}

export interface LoginBody {
	login: string;
	password: string;
}

export interface TokenData {
	accessToken: string | null | undefined;
	issued: number;
	expires: number;
}

export const defaultTokenData: TokenData = {
	accessToken: "",
	issued: 0,
	expires: 0
}

export async function fetchToken(apiUrl: string){
	const res = await fetch(`${apiUrl}/refresh`);
	return await res.json() as TokenResponse;
}

export function parseToken(rawToken: string | null | undefined): TokenData {
	if(!rawToken){
		return defaultTokenData;
	}

	const payloads = rawToken.split(".");
	if(payloads.length !== 3){
		return defaultTokenData;
	}

	const payload = payloads[1];

	const tokenBody = JSON.parse(atob(payload)) as TokenBody;

	return ({
		accessToken: rawToken,
		issued: tokenBody.iat * 1000,
		expires: tokenBody.exp * 1000
	});
}