// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

(function() {
  "use strict";

  var runFunc;
  var count = 0;

  function getId() {
    return "code" + (count++);
  }

  function text(node) {
    var s = "";
    for (var i = 0; i < node.childNodes.length; i++) {
      var n = node.childNodes[i];
      if (n.nodeType === 1 && n.tagName === "PRE") {
        var innerText = n.innerText === undefined ? "textContent" : "innerText";
        s += n[innerText] + "\n";
        continue;
      }
      if (n.nodeType === 1 && n.tagName !== "BUTTON") {
        s += text(n);
      }
    }
    return s;
  }

  function init(code) {
    var id = getId();

    var output = document.createElement('div');
    var outpre = document.createElement('pre');
    var stopFunc;

    function onKill() {
      if (stopFunc) {
        stopFunc();
      }
    }

    function onRun() {
      onKill();
      outpre.innerHTML = "";
      output.style.display = "block";
      run.style.display = "none";
      stopFunc = runFunc(text(code), outpre);
    }

    function onClose() {
      onKill();
      output.style.display = "none";
      run.style.display = "inline-block";
    }

    var run = document.createElement('button');
    run.innerHTML = 'Run';
    run.className = 'run';
    run.addEventListener("click", onRun, false);
    var run2 = document.createElement('button');
    run2.className = 'run';
    run2.innerHTML = 'Run';
    run2.addEventListener("click", onRun, false);
    var kill = document.createElement('button');
    kill.className = 'kill';
    kill.innerHTML = 'Kill';
    kill.addEventListener("click", onKill, false);
    var close = document.createElement('button');
    close.className = 'close';
    close.innerHTML = 'Close';
    close.addEventListener("click", onClose, false);

    var button = document.createElement('div');
    button.classList.add('buttons');
    button.appendChild(run);
    // Hack to simulate insertAfter
    code.parentNode.insertBefore(button, code.nextSibling);

    var buttons = document.createElement('div');
    buttons.classList.add('buttons');
    buttons.appendChild(run2);
    buttons.appendChild(kill);
    buttons.appendChild(close);

    output.classList.add('output');
    output.appendChild(buttons);
    output.appendChild(outpre);
    output.style.display = "none";
    code.parentNode.insertBefore(output, button.nextSibling);
  }

  var play = document.querySelectorAll('div.playground');
  for (var i = 0; i < play.length; i++) {
    init(play[i]);
  }
  if (play.length > 0) {
    if (window.connectPlayground) {
      runFunc = window.connectPlayground("ws://" + window.location.host + "/socket");
    } else {
      // If this message is logged,
      // we have neglected to include socket.js or playground.js.
      console.log("No playground transport available.");
    }
  }
})();