common = require("../common");
assert = common.assert;
var util = require("util"),
fs = require("fs"),
http = require("http"),
url = require("url");

var chunk = '01234567890123456789';

// Produce a very large response.
var chargen = http.createServer(function (req, res) {
  var len = parseInt(req.headers['x-len'], 10);
  assert.ok(len > 0);
  res.writeHead(200, {"transfer-encoding":"chunked"});
  for (var i=0; i<len; i++) {
    if (i % 1000 == 0) common.print(',');
    res.write(chunk);
  }
  res.end();
});
chargen.listen(9000, ready);

// Proxy to the chargen server.
var proxy = http.createServer(function (req, res) {
  var c = http.createClient(9000, 'localhost');

  var len = parseInt(req.headers['x-len'], 10);
  assert.ok(len > 0);

  var sent = 0;


  c.addListener('error', function (e) {
    console.log('proxy client error. sent ' + sent);
    throw e;
  });

  var proxy_req = c.request(req.method, req.url, req.headers);
  proxy_req.addListener('response', function(proxy_res) {
    res.writeHead(proxy_res.statusCode, proxy_res.headers);

    var count = 0;

    proxy_res.addListener('data', function(d) {
      if (count++ % 1000 == 0) common.print('.');
      res.write(d);
      sent += d.length;
      assert.ok(sent <= (len*chunk.length));
    });

    proxy_res.addListener('end', function() {
      res.end();
    });

  });

  proxy_req.end();
});
proxy.listen(9001, ready);

var done = false;

function call_chargen(list) {
  if (list.length > 0) {
    var len = list.shift();

    common.debug("calling chargen for " + len + " chunks.");

    var recved = 0;

    var req = http.createClient(9001, 'localhost').request('/', {'x-len': len});

    req.addListener('response', function(res) {

      res.addListener('data', function(d) {
        recved += d.length;
        assert.ok(recved <= (len*chunk.length));
      });

      res.addListener('end', function() {
        assert.ok(recved <= (len*chunk.length));
        common.debug("end for " + len + " chunks.");
        call_chargen(list);
      });

    });
    req.end();

  } else {
    console.log("End of list. closing servers");
    proxy.close();
    chargen.close();
    done = true;
  }
}

serversRunning = 0;
function ready () {
  if (++serversRunning < 2) return;
  call_chargen([ 100, 1000, 10000, 100000, 1000000 ]);
}

process.addListener('exit', function () {
  assert.ok(done);
});