'use strict';

const common = require('../common');

const assert = require('assert');
const dns = require('dns');
const net = require('net');

let running = false;
const queue = [];

const dnsPromises = dns.promises;
const isIPv4 = net.isIPv4;
const isIPv6 = net.isIPv6;

dns.setServers([ '8.8.8.8', '8.8.4.4' ]);

function checkWrap(req) {
  assert.ok(typeof req === 'object');
}

const checkers = {
  checkA(r) {
    assert.ok(isIPv4(r.address));
    assert.strictEqual(typeof r.ttl, 'number');
    assert.strictEqual(r.type, 'A');
  },
  checkAAAA(r) {
    assert.ok(isIPv6(r.address));
    assert.strictEqual(typeof r.ttl, 'number');
    assert.strictEqual(r.type, 'AAAA');
  },
  checkCNAME(r) {
    assert.ok(r.value);
    assert.strictEqual(typeof r.value, 'string');
    assert.strictEqual(r.type, 'CNAME');
  },
  checkMX(r) {
    assert.strictEqual(typeof r.exchange, 'string');
    assert.strictEqual(typeof r.priority, 'number');
    assert.strictEqual(r.type, 'MX');
  },
  checkNAPTR(r) {
    assert.strictEqual(typeof r.flags, 'string');
    assert.strictEqual(typeof r.service, 'string');
    assert.strictEqual(typeof r.regexp, 'string');
    assert.strictEqual(typeof r.replacement, 'string');
    assert.strictEqual(typeof r.order, 'number');
    assert.strictEqual(typeof r.preference, 'number');
    assert.strictEqual(r.type, 'NAPTR');
  },
  checkNS(r) {
    assert.strictEqual(typeof r.value, 'string');
    assert.strictEqual(r.type, 'NS');
  },
  checkPTR(r) {
    assert.strictEqual(typeof r.value, 'string');
    assert.strictEqual(r.type, 'PTR');
  },
  checkTXT(r) {
    assert.ok(Array.isArray(r.entries));
    assert.ok(r.entries.length > 0);
    assert.strictEqual(r.type, 'TXT');
  },
  checkSOA(r) {
    assert.strictEqual(typeof r.nsname, 'string');
    assert.strictEqual(typeof r.hostmaster, 'string');
    assert.strictEqual(typeof r.serial, 'number');
    assert.strictEqual(typeof r.refresh, 'number');
    assert.strictEqual(typeof r.retry, 'number');
    assert.strictEqual(typeof r.expire, 'number');
    assert.strictEqual(typeof r.minttl, 'number');
    assert.strictEqual(r.type, 'SOA');
  },
  checkSRV(r) {
    assert.strictEqual(typeof r.name, 'string');
    assert.strictEqual(typeof r.port, 'number');
    assert.strictEqual(typeof r.priority, 'number');
    assert.strictEqual(typeof r.weight, 'number');
    assert.strictEqual(r.type, 'SRV');
  },
};

function TEST(f) {
  function next() {
    const f = queue.shift();
    if (f) {
      running = true;
      f(done);
    }
  }

  function done() {
    running = false;
    process.nextTick(next);
  }

  queue.push(f);

  if (!running) {
    next();
  }
}

function processResult(res) {
  assert.ok(Array.isArray(res));
  assert.ok(res.length > 0);

  const types = {};
  res.forEach((obj) => {
    types[obj.type] = true;
    checkers[`check${obj.type}`](obj);
  });

  return types;
}

TEST(async function test_sip2sip_for_naptr(done) {
  function validateResult(res) {
    const types = processResult(res);
    assert.ok(types.A && types.NS && types.NAPTR && types.SOA,
              `Missing record type, found ${Object.keys(types)}`);
  }

  validateResult(await dnsPromises.resolve('sip2sip.info', 'ANY'));

  const req = dns.resolve(
    'sip2sip.info',
    'ANY',
    common.mustSucceed((ret) => {
      validateResult(ret);
      done();
    }));

  checkWrap(req);
});

TEST(async function test_google_for_cname_and_srv(done) {
  function validateResult(res) {
    const types = processResult(res);
    assert.ok(types.SRV);
  }

  validateResult(await dnsPromises.resolve('_caldav._tcp.google.com', 'ANY'));

  const req = dns.resolve(
    '_caldav._tcp.google.com',
    'ANY',
    common.mustSucceed((ret) => {
      validateResult(ret);
      done();
    }));

  checkWrap(req);
});

TEST(async function test_ptr(done) {
  function validateResult(res) {
    const types = processResult(res);
    assert.ok(types.PTR);
  }

  validateResult(await dnsPromises.resolve('8.8.8.8.in-addr.arpa', 'ANY'));

  const req = dns.resolve(
    '8.8.8.8.in-addr.arpa',
    'ANY',
    common.mustSucceed((ret) => {
      validateResult(ret);
      done();
    }));

  checkWrap(req);
});