'use strict';
require('../common');
const assert = require('assert');
const async_hooks = require('async_hooks');
const http = require('http');

// Regression test for https://github.com/nodejs/node/issues/19859.
// Checks that matching destroys are emitted when creating new/reusing old http
// parser instances.

const N = 50;
const KEEP_ALIVE = 100;

const createdIdsIncomingMessage = [];
const createdIdsClientRequest = [];
const destroyedIdsIncomingMessage = [];
const destroyedIdsClientRequest = [];

async_hooks.createHook({
  init: (asyncId, type) => {
    if (type === 'HTTPINCOMINGMESSAGE') {
      createdIdsIncomingMessage.push(asyncId);
    }
    if (type === 'HTTPCLIENTREQUEST') {
      createdIdsClientRequest.push(asyncId);
    }
  },
  destroy: (asyncId) => {
    if (createdIdsIncomingMessage.includes(asyncId)) {
      destroyedIdsIncomingMessage.push(asyncId);
    }
    if (createdIdsClientRequest.includes(asyncId)) {
      destroyedIdsClientRequest.push(asyncId);
    }

    if (destroyedIdsClientRequest.length === N && keepAliveAgent) {
      keepAliveAgent.destroy();
      keepAliveAgent = undefined;
    }

    if (destroyedIdsIncomingMessage.length === N && server.listening) {
      server.close();
    }
  }
}).enable();

const server = http.createServer((req, res) => {
  res.end('Hello');
});

let keepAliveAgent = new http.Agent({
  keepAlive: true,
  keepAliveMsecs: KEEP_ALIVE,
});

server.listen(0, () => {
  for (let i = 0; i < N; ++i) {
    (function makeRequest() {
      http.get({
        port: server.address().port,
        agent: keepAliveAgent
      }, (res) => {
        res.resume();
      });
    })();
  }
});

function checkOnExit() {
  assert.strictEqual(createdIdsIncomingMessage.length, N);
  assert.strictEqual(createdIdsClientRequest.length, N);
  assert.strictEqual(destroyedIdsIncomingMessage.length, N);
  assert.strictEqual(destroyedIdsClientRequest.length, N);

  assert.deepStrictEqual(destroyedIdsIncomingMessage.sort(),
                         createdIdsIncomingMessage.sort());
  assert.deepStrictEqual(destroyedIdsClientRequest.sort(),
                         createdIdsClientRequest.sort());
}

process.on('SIGTERM', () => {
  // Catching SIGTERM and calling `process.exit(1)`  so that the `exit` event
  // is triggered and the assertions are checked. This can be useful for
  // troubleshooting this test if it times out.
  process.exit(1);
});

// Ordinary exit.
process.on('exit', checkOnExit);
