import { describe, expect, it } from "vitest";

import {
  PAIRING_INVITATION_PREFIX,
  createPairingInvitation,
  pairingInvitationUrl,
  parsePairingInvitation,
} from "./pairing-invitation";

const TOKEN = "AAECAwQFBgcICQoLDA0ODw";
const RELAY = "wss://relay.peachpasswords.com";
const KAT =
  "peach-pair-v1:eyJyZWxheSI6IndzczovL3JlbGF5LnBlYWNocGFzc3dvcmRzLmNvbSIsInRva2VuIjoiQUFFQ0F3UUZCZ2NJQ1FvTERBME9EdyJ9";

describe("relay pairing invitation", () => {
  it("pins the cross-client compact JSON/base64url vector", () => {
    expect(createPairingInvitation(`${RELAY}/`, TOKEN)).toBe(KAT);
    expect(parsePairingInvitation(KAT)).toEqual({ relayUrl: RELAY, token: TOKEN });
  });

  it("builds a room URL without identity or vault state", () => {
    const parsed = parsePairingInvitation(KAT);
    expect(parsed).not.toBeNull();
    expect(pairingInvitationUrl(parsed!)).toBe(`${RELAY}/r/${TOKEN}`);
    expect(KAT).not.toContain("device");
    expect(KAT).not.toContain("vault");
  });

  it("fails closed on malformed, insecure, or short-token payloads", () => {
    expect(parsePairingInvitation("not-an-invitation")).toBeNull();
    expect(parsePairingInvitation(`${PAIRING_INVITATION_PREFIX}%%%`)).toBeNull();
    const insecure = createRaw({ relay: "ws://relay.example.test", token: TOKEN });
    expect(parsePairingInvitation(insecure)).toBeNull();
    const shortToken = createRaw({ relay: RELAY, token: "too-short" });
    expect(parsePairingInvitation(shortToken)).toBeNull();
  });
});

function createRaw(value: unknown): string {
  const bytes = new TextEncoder().encode(JSON.stringify(value));
  let binary = "";
  for (const byte of bytes) binary += String.fromCharCode(byte);
  return `${PAIRING_INVITATION_PREFIX}${btoa(binary)
    .replace(/\+/g, "-")
    .replace(/\//g, "_")
    .replace(/=+$/g, "")}`;
}