'use strict';

const common = require('../common');
if (!common.hasCrypto)
  common.skip('missing crypto');
const assert = require('assert');
const http2 = require('http2');

const testResBody = 'other stuff!\n';

// Checks the full 100-continue flow from client sending 'expect: 100-continue'
// through server receiving it, triggering 'checkContinue' custom handler,
// writing the rest of the request to finally the client receiving to.

const server = http2.createServer(
  common.mustNotCall('Full request received before 100 Continue')
);

server.on('checkContinue', common.mustCall((req, res) => {
  res.writeContinue();
  res.writeHead(200, {});
  res.end(testResBody);
  // Should simply return false if already too late to write
  assert.strictEqual(res.writeContinue(), false);
  res.on('finish', common.mustCall(
    () => process.nextTick(() => assert.strictEqual(res.writeContinue(), false))
  ));
}));

server.listen(0, common.mustCall(() => {
  let body = '';

  const client = http2.connect(`http://localhost:${server.address().port}`);
  const req = client.request({
    ':method': 'POST',
    'expect': '100-continue'
  });

  let gotContinue = false;
  req.on('continue', common.mustCall(() => {
    gotContinue = true;
  }));

  req.on('response', common.mustCall((headers) => {
    assert.strictEqual(gotContinue, true);
    assert.strictEqual(headers[':status'], 200);
    req.end();
  }));

  req.setEncoding('utf-8');
  req.on('data', common.mustCall((chunk) => { body += chunk; }));

  req.on('end', common.mustCall(() => {
    assert.strictEqual(body, testResBody);
    client.close();
    server.close();
  }));
}));