import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { decryptPayrollPdf, encryptPayrollPdf, getPayrollEncryptionStatus } from "./payrollCrypto";

const originalKey = process.env.PAYROLL_ENCRYPTION_KEY;

describe.sequential("payrollCrypto", () => {
  beforeEach(() => {
    process.env.PAYROLL_ENCRYPTION_KEY = Buffer.alloc(32, 7).toString("base64");
  });

  afterEach(() => {
    if (originalKey === undefined) delete process.env.PAYROLL_ENCRYPTION_KEY;
    else process.env.PAYROLL_ENCRYPTION_KEY = originalKey;
  });

  it("chiffre puis déchiffre un PDF sans changer son contenu", () => {
    const original = Buffer.from("%PDF-1.7 contenu de test", "utf8");
    const encrypted = encryptPayrollPdf(original);

    expect(encrypted.ciphertext).not.toEqual(original);
    expect(decryptPayrollPdf(encrypted)).toEqual(original);
    expect(getPayrollEncryptionStatus()).toEqual({ ready: true, algorithm: "AES-256-GCM" });
  });

  it("refuse un tag d'authentification altéré", () => {
    const encrypted = encryptPayrollPdf(Buffer.from("%PDF-1.7 contenu de test", "utf8"));
    const tamperedTag = Buffer.from(encrypted.authTagBase64, "base64");
    tamperedTag[0] = tamperedTag[0]! ^ 0xff;

    expect(() => decryptPayrollPdf({ ...encrypted, authTagBase64: tamperedTag.toString("base64") })).toThrow();
  });

  it("ne révèle aucune erreur détaillée lorsque la clé est invalide", () => {
    process.env.PAYROLL_ENCRYPTION_KEY = "invalide";
    expect(getPayrollEncryptionStatus()).toEqual({ ready: false, algorithm: "AES-256-GCM" });
  });
});