import { describe, expect, it } from "vitest";
import vm from "node:vm";
import { randomUUIDPolyfillScript } from "@/lib/client/random-uuid-polyfill";

type RandomUUIDContext = {
  crypto?: {
    randomUUID?: () => string;
    getRandomValues?: (bytes: Uint8Array) => Uint8Array;
  };
};

describe("client randomUUID polyfill", () => {
  it("defines crypto.randomUUID when crypto is missing", () => {
    const context: RandomUUIDContext = {};

    vm.runInNewContext(randomUUIDPolyfillScript, context);

    expect(context.crypto?.randomUUID?.()).toMatch(
      /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/
    );
  });

  it("defines crypto.randomUUID when only getRandomValues is available", () => {
    const context: RandomUUIDContext = {
      crypto: {
        getRandomValues(bytes: Uint8Array) {
          for (let index = 0; index < bytes.length; index += 1) bytes[index] = index;
          return bytes;
        }
      }
    };

    vm.runInNewContext(randomUUIDPolyfillScript, context);

    expect(context.crypto?.randomUUID?.()).toMatch(
      /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/
    );
  });
});