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

const binding = process.binding('http_parser');
const methods = binding.methods;
const HTTPParser = binding.HTTPParser;

const CRLF = '\r\n';
const REQUEST = HTTPParser.REQUEST;
const RESPONSE = HTTPParser.RESPONSE;

const kOnHeaders = HTTPParser.kOnHeaders | 0;
const kOnHeadersComplete = HTTPParser.kOnHeadersComplete | 0;
const kOnBody = HTTPParser.kOnBody | 0;
const kOnMessageComplete = HTTPParser.kOnMessageComplete | 0;

// The purpose of this test is not to check HTTP compliance but to test the
// binding. Tests for pathological http messages should be submitted
// upstream to https://github.com/joyent/http-parser for inclusion into
// deps/http-parser/test.c


function newParser(type) {
  const parser = new HTTPParser(type);

  parser.headers = [];
  parser.url = '';

  parser[kOnHeaders] = function(headers, url) {
    parser.headers = parser.headers.concat(headers);
    parser.url += url;
  };

  parser[kOnHeadersComplete] = function(info) {
  };

  parser[kOnBody] = common.mustNotCall('kOnBody should not be called');

  parser[kOnMessageComplete] = function() {
  };

  return parser;
}


function mustCall(f, times) {
  let actual = 0;

  process.setMaxListeners(256);
  process.on('exit', function() {
    assert.strictEqual(actual, times || 1);
  });

  return function() {
    actual++;
    return f.apply(this, Array.prototype.slice.call(arguments));
  };
}


function expectBody(expected) {
  return mustCall(function(buf, start, len) {
    const body = '' + buf.slice(start, start + len);
    assert.strictEqual(body, expected);
  });
}


//
// Simple request test.
//
{
  const request = Buffer.from(
      'GET /hello HTTP/1.1' + CRLF +
      CRLF);

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
    assert.strictEqual(method, methods.indexOf('GET'));
    assert.strictEqual(url || parser.url, '/hello');
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser.execute(request, 0, request.length);

  //
  // Check that if we throw an error in the callbacks that error will be
  // thrown from parser.execute()
  //

  parser[kOnHeadersComplete] = function(info) {
    throw new Error('hello world');
  };

  parser.reinitialize(HTTPParser.REQUEST);

  assert.throws(function() {
    parser.execute(request, 0, request.length);
  }, Error, 'hello world');
}


//
// Simple response test.
//
{
  const request = Buffer.from(
      'HTTP/1.1 200 OK' + CRLF +
      'Content-Type: text/plain' + CRLF +
      'Content-Length: 4' + CRLF +
      CRLF +
      'pong');

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, undefined);
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
    assert.strictEqual(statusCode, 200);
    assert.strictEqual(statusMessage, 'OK');
  };

  const onBody = function(buf, start, len) {
    const body = '' + buf.slice(start, start + len);
    assert.strictEqual(body, 'pong');
  };

  const parser = newParser(RESPONSE);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser[kOnBody] = mustCall(onBody);
  parser.execute(request, 0, request.length);
}


//
// Response with no headers.
//
{
  const request = Buffer.from(
      'HTTP/1.0 200 Connection established' + CRLF +
      CRLF);

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 0);
    assert.strictEqual(method, undefined);
    assert.strictEqual(statusCode, 200);
    assert.strictEqual(statusMessage, 'Connection established');
    assert.deepStrictEqual(headers || parser.headers, []);
  };

  const parser = newParser(RESPONSE);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser.execute(request, 0, request.length);
}


//
// Trailing headers.
//
{
  const request = Buffer.from(
      'POST /it HTTP/1.1' + CRLF +
      'Transfer-Encoding: chunked' + CRLF +
      CRLF +
      '4' + CRLF +
      'ping' + CRLF +
      '0' + CRLF +
      'Vary: *' + CRLF +
      'Content-Type: text/plain' + CRLF +
      CRLF);

  let seen_body = false;

  const onHeaders = function(headers, url) {
    assert.ok(seen_body); // trailers should come after the body
    assert.deepStrictEqual(headers,
                           ['Vary', '*', 'Content-Type', 'text/plain']);
  };

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('POST'));
    assert.strictEqual(url || parser.url, '/it');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
    // expect to see trailing headers now
    parser[kOnHeaders] = mustCall(onHeaders);
  };

  const onBody = function(buf, start, len) {
    const body = '' + buf.slice(start, start + len);
    assert.strictEqual(body, 'ping');
    seen_body = true;
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser[kOnBody] = mustCall(onBody);
  parser.execute(request, 0, request.length);
}


//
// Test header ordering.
//
{
  const request = Buffer.from(
      'GET / HTTP/1.0' + CRLF +
      'X-Filler: 1337' + CRLF +
      'X-Filler:   42' + CRLF +
      'X-Filler2:  42' + CRLF +
      CRLF);

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('GET'));
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 0);
    assert.deepStrictEqual(
        headers || parser.headers,
        ['X-Filler', '1337', 'X-Filler', '42', 'X-Filler2', '42']);
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser.execute(request, 0, request.length);
}


//
// Test large number of headers
//
{
  // 256 X-Filler headers
  let lots_of_headers = 'X-Filler: 42' + CRLF;
  lots_of_headers = lots_of_headers.repeat(256);

  const request = Buffer.from(
      'GET /foo/bar/baz?quux=42#1337 HTTP/1.0' + CRLF +
      lots_of_headers +
      CRLF);

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('GET'));
    assert.strictEqual(url || parser.url, '/foo/bar/baz?quux=42#1337');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 0);

    headers = headers || parser.headers;

    assert.strictEqual(headers.length, 2 * 256); // 256 key/value pairs
    for (let i = 0; i < headers.length; i += 2) {
      assert.strictEqual(headers[i], 'X-Filler');
      assert.strictEqual(headers[i + 1], '42');
    }
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser.execute(request, 0, request.length);
}


//
// Test request body
//
{
  const request = Buffer.from(
      'POST /it HTTP/1.1' + CRLF +
      'Content-Type: application/x-www-form-urlencoded' + CRLF +
      'Content-Length: 15' + CRLF +
      CRLF +
      'foo=42&bar=1337');

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('POST'));
    assert.strictEqual(url || parser.url, '/it');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
  };

  const onBody = function(buf, start, len) {
    const body = '' + buf.slice(start, start + len);
    assert.strictEqual(body, 'foo=42&bar=1337');
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser[kOnBody] = mustCall(onBody);
  parser.execute(request, 0, request.length);
}


//
// Test chunked request body
//
{
  const request = Buffer.from(
      'POST /it HTTP/1.1' + CRLF +
      'Content-Type: text/plain' + CRLF +
      'Transfer-Encoding: chunked' + CRLF +
      CRLF +
      '3' + CRLF +
      '123' + CRLF +
      '6' + CRLF +
      '123456' + CRLF +
      'A' + CRLF +
      '1234567890' + CRLF +
      '0' + CRLF);

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('POST'));
    assert.strictEqual(url || parser.url, '/it');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
  };

  let body_part = 0;
  const body_parts = ['123', '123456', '1234567890'];

  const onBody = function(buf, start, len) {
    const body = '' + buf.slice(start, start + len);
    assert.strictEqual(body, body_parts[body_part++]);
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser[kOnBody] = mustCall(onBody, body_parts.length);
  parser.execute(request, 0, request.length);
}


//
// Test chunked request body spread over multiple buffers (packets)
//
{
  let request = Buffer.from(
      'POST /it HTTP/1.1' + CRLF +
      'Content-Type: text/plain' + CRLF +
      'Transfer-Encoding: chunked' + CRLF +
      CRLF +
      '3' + CRLF +
      '123' + CRLF +
      '6' + CRLF +
      '123456' + CRLF);

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('POST'));
    assert.strictEqual(url || parser.url, '/it');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
  };

  let body_part = 0;
  const body_parts =
          ['123', '123456', '123456789', '123456789ABC', '123456789ABCDEF'];

  const onBody = function(buf, start, len) {
    const body = '' + buf.slice(start, start + len);
    assert.strictEqual(body, body_parts[body_part++]);
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser[kOnBody] = mustCall(onBody, body_parts.length);
  parser.execute(request, 0, request.length);

  request = Buffer.from(
      '9' + CRLF +
      '123456789' + CRLF +
      'C' + CRLF +
      '123456789ABC' + CRLF +
      'F' + CRLF +
      '123456789ABCDEF' + CRLF +
      '0' + CRLF);

  parser.execute(request, 0, request.length);
}


//
// Stress test.
//
{
  const request = Buffer.from(
      'POST /helpme HTTP/1.1' + CRLF +
      'Content-Type: text/plain' + CRLF +
      'Transfer-Encoding: chunked' + CRLF +
      CRLF +
      '3' + CRLF +
      '123' + CRLF +
      '6' + CRLF +
      '123456' + CRLF +
      '9' + CRLF +
      '123456789' + CRLF +
      'C' + CRLF +
      '123456789ABC' + CRLF +
      'F' + CRLF +
      '123456789ABCDEF' + CRLF +
      '0' + CRLF);

  function test(a, b) {
    const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                       method, url, statusCode, statusMessage,
                                       upgrade, shouldKeepAlive) {
      assert.strictEqual(method, methods.indexOf('POST'));
      assert.strictEqual(url || parser.url, '/helpme');
      assert.strictEqual(versionMajor, 1);
      assert.strictEqual(versionMinor, 1);
    };

    let expected_body = '123123456123456789123456789ABC123456789ABCDEF';

    const onBody = function(buf, start, len) {
      const chunk = '' + buf.slice(start, start + len);
      assert.strictEqual(expected_body.indexOf(chunk), 0);
      expected_body = expected_body.slice(chunk.length);
    };

    const parser = newParser(REQUEST);
    parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
    parser[kOnBody] = onBody;
    parser.execute(a, 0, a.length);
    parser.execute(b, 0, b.length);

    assert.strictEqual(expected_body, '');
  }

  for (let i = 1; i < request.length - 1; ++i) {
    const a = request.slice(0, i);
    console.error('request.slice(0, ' + i + ') = ',
                  JSON.stringify(a.toString()));
    const b = request.slice(i);
    console.error('request.slice(' + i + ') = ',
                  JSON.stringify(b.toString()));
    test(a, b);
  }
}


//
// Byte by byte test.
//
{
  const request = Buffer.from(
      'POST /it HTTP/1.1' + CRLF +
      'Content-Type: text/plain' + CRLF +
      'Transfer-Encoding: chunked' + CRLF +
      CRLF +
      '3' + CRLF +
      '123' + CRLF +
      '6' + CRLF +
      '123456' + CRLF +
      '9' + CRLF +
      '123456789' + CRLF +
      'C' + CRLF +
      '123456789ABC' + CRLF +
      'F' + CRLF +
      '123456789ABCDEF' + CRLF +
      '0' + CRLF);

  const onHeadersComplete = function(versionMajor, versionMinor, headers,
                                     method, url, statusCode, statusMessage,
                                     upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('POST'));
    assert.strictEqual(url || parser.url, '/it');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
    assert.deepStrictEqual(
        headers || parser.headers,
        ['Content-Type', 'text/plain', 'Transfer-Encoding', 'chunked']);
  };

  let expected_body = '123123456123456789123456789ABC123456789ABCDEF';

  const onBody = function(buf, start, len) {
    const chunk = '' + buf.slice(start, start + len);
    assert.strictEqual(expected_body.indexOf(chunk), 0);
    expected_body = expected_body.slice(chunk.length);
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = mustCall(onHeadersComplete);
  parser[kOnBody] = onBody;

  for (let i = 0; i < request.length; ++i) {
    parser.execute(request, i, 1);
  }

  assert.strictEqual(expected_body, '');
}


//
// Test parser reinit sequence.
//
{
  const req1 = Buffer.from(
      'PUT /this HTTP/1.1' + CRLF +
      'Content-Type: text/plain' + CRLF +
      'Transfer-Encoding: chunked' + CRLF +
      CRLF +
      '4' + CRLF +
      'ping' + CRLF +
      '0' + CRLF);

  const req2 = Buffer.from(
      'POST /that HTTP/1.0' + CRLF +
      'Content-Type: text/plain' + CRLF +
      'Content-Length: 4' + CRLF +
      CRLF +
      'pong');

  const onHeadersComplete1 = function(versionMajor, versionMinor, headers,
                                      method, url, statusCode, statusMessage,
                                      upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('PUT'));
    assert.strictEqual(url, '/this');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 1);
    assert.deepStrictEqual(
        headers,
        ['Content-Type', 'text/plain', 'Transfer-Encoding', 'chunked']);
  };

  const onHeadersComplete2 = function(versionMajor, versionMinor, headers,
                                      method, url, statusCode, statusMessage,
                                      upgrade, shouldKeepAlive) {
    assert.strictEqual(method, methods.indexOf('POST'));
    assert.strictEqual(url, '/that');
    assert.strictEqual(versionMajor, 1);
    assert.strictEqual(versionMinor, 0);
    assert.deepStrictEqual(
      headers,
      ['Content-Type', 'text/plain', 'Content-Length', '4']
    );
  };

  const parser = newParser(REQUEST);
  parser[kOnHeadersComplete] = onHeadersComplete1;
  parser[kOnBody] = expectBody('ping');
  parser.execute(req1, 0, req1.length);

  parser.reinitialize(REQUEST);
  parser[kOnBody] = expectBody('pong');
  parser[kOnHeadersComplete] = onHeadersComplete2;
  parser.execute(req2, 0, req2.length);
}

// Test parser 'this' safety
// https://github.com/joyent/node/issues/6690
assert.throws(function() {
  const request = Buffer.from(
      'GET /hello HTTP/1.1' + CRLF +
      CRLF);

  const parser = newParser(REQUEST);
  const notparser = { execute: parser.execute };
  notparser.execute(request, 0, request.length);
}, TypeError);
