// Import Node's built-in test tools.
const test = require("node:test");
const assert = require("node:assert/strict");

// Import the DNS service.
const {
  lookupDns,
  resolveRecord,
  RECORD_TYPES,
} = require("../src/services/dnsService");

test("supports the expected DNS record types", () => {
  assert.deepEqual(
    RECORD_TYPES,
    ["A", "AAAA", "CNAME", "MX", "TXT", "NS"]
  );
});

test("resolves A records for example.com", async () => {
  const records = await resolveRecord("example.com", "A");

  assert.equal(Array.isArray(records), true);
  assert.equal(records.length > 0, true);
});

test("returns an array for a missing optional record type", async () => {
  const records = await resolveRecord(
    "example.com",
    "CNAME"
  );

  assert.equal(Array.isArray(records), true);
});

test("joins TXT record fragments into strings", async () => {
  const records = await resolveRecord("google.com", "TXT");

  assert.equal(Array.isArray(records), true);

  records.forEach((record) => {
    assert.equal(typeof record, "string");
  });
});

test("returns all supported record groups", async () => {
  const result = await lookupDns("example.com");

  assert.equal(result.hostname, "example.com");
  assert.equal(typeof result.checkedAt, "string");
  assert.equal(typeof result.records, "object");

  RECORD_TYPES.forEach((recordType) => {
    assert.equal(
      Array.isArray(result.records[recordType]),
      true
    );
  });
});

test("returns a valid ISO timestamp", async () => {
  const result = await lookupDns("example.com");
  const timestamp = Date.parse(result.checkedAt);

  assert.equal(Number.isNaN(timestamp), false);
});