import { createDecoder, createSigner, createVerifier } from "fast-jwt";
import { jwt } from "#environment/jwt";

import type { UserSession } from "#types/config";

class JWTService {
	private readonly signer;
	private readonly verifier;
	private readonly decoder;

	constructor() {
		this.signer = createSigner({
			key: jwt.secret,
			expiresIn: jwt.expiration,
		});
		this.verifier = createVerifier({ key: jwt.secret });
		this.decoder = createDecoder();
	}

	sign(payload: UserSession): string {
		return this.signer(payload);
	}

	verify(token: string): UserSession {
		return this.verifier(token);
	}

	decode(token: string): UserSession {
		return this.decoder(token);
	}
}

export const jwtService = new JWTService();
export { JWTService };