'use strict';

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

const bench = common.createBenchmark(main, {
  len: [4, 8, 16, 32],
  n: [1e5],
}, {
  flags: ['--expose-internals', '--no-warnings'],
});

function main({ len, n }) {
  const { HTTPParser } = common.binding('http_parser');
  const REQUEST = HTTPParser.REQUEST;
  const kOnHeaders = HTTPParser.kOnHeaders | 0;
  const kOnHeadersComplete = HTTPParser.kOnHeadersComplete | 0;
  const kOnBody = HTTPParser.kOnBody | 0;
  const kOnMessageComplete = HTTPParser.kOnMessageComplete | 0;
  const kMaxHeaderPairs = 2000;

  function processHeader(header, n) {
    const parser = newParser(REQUEST);

    bench.start();
    for (let i = 0; i < n; i++) {
      parser.execute(header, 0, header.length);
      parser.initialize(REQUEST, {}, 0, 0, undefined, kMaxHeaderPairs);
    }
    bench.end(n);
  }

  function newParser(type) {
    const parser = new HTTPParser();
    // Direct parsers bypass cleanParser(); use its production default.
    parser.initialize(type, {}, 0, 0, undefined, kMaxHeaderPairs);

    parser.headers = [];

    parser[kOnHeaders] = function() { };
    parser[kOnHeadersComplete] = function() { };
    parser[kOnBody] = function() { };
    parser[kOnMessageComplete] = function() { };

    return parser;
  }

  let header = `GET /hello HTTP/1.1\r\nContent-Type: text/plain\r\n`;

  for (let i = 0; i < len; i++) {
    header += `X-Filler${i}: ${Math.random().toString(36).substring(2)}\r\n`;
  }
  header += '\r\n';

  processHeader(Buffer.from(header), n);
}