var socket = new ServerSocket();

var PORT = 8080;

socket.bind("127.0.0.1", PORT);
socket.listen();

var NEWLINE = "\r\n";
var DOUBLE_NEWLINE = NEWLINE + NEWLINE;

function getHeaders(conn) {
  var headers = "";
  while (1) {
    var character = conn.recv(1);
    if (character == null)
      return null;
    headers += character;
    if (headers.indexOf(DOUBLE_NEWLINE) != -1)
      return headers;
  }
}

print("Waiting for requests on port " + PORT + ".");

function processRequest(socket) {
  var conn = socket.accept();

  try {
    var requestHeaders = getHeaders(conn);
    if (requestHeaders == null)
      return true;
    var requestLines = requestHeaders.split("\r\n");
    print(requestLines[0]);
    var reqParts = requestLines[0].split(" ");
    var method = reqParts[0];
    var path = reqParts[1];

    var code = "200 OK";
    var toSend;

    // TODO: We'd like to set the MIME type of JSON data to application/json,
    // but Firefox doesn't let us browse a webserver this way, which is
    // annoying, so we're just leaving it at text/plain for now.

    if (path == "/gc-roots")
      toSend = JSON.stringify(getGCRoots());

    if (path == "/stop")
      toSend = "Stopping server now!";

    var objNum = path.match(/^\/objects\/(\d+)$/);
    if (objNum) {
      objNum = objNum[1];
      var objInfo = getObjectInfo(objNum);
      if (objInfo) {
        toSend = JSON.stringify(objInfo);
      } else {
        code = "404 Not Found";
        toSend = "Object " + objNum + " does not exist.";
      }
    }

    if (!toSend) {
      code = "404 Not Found";
      toSend = "Not found, yo.";
    }

    //print("headers: " + uneval(requestHeaders));
    var headerLines = ["HTTP/1.0 " + code,
                       "Content-Type: text/plain",
                       "Connection: close",
                       "Content-Length: " + toSend.length];
    var headers = headerLines.join("\r\n");
    var response = headers + DOUBLE_NEWLINE + toSend;
    //print("response: " + uneval(response));
    conn.send(response);
    conn.close();
    //print("response sent.");
  } catch (e) {
    print(e.toString());
    try { conn.close(); } catch (e) {}
  }
  if (path == "/stop")
    return false;
  return true;
}

while (processRequest(socket)) {}
socket.close();