/**
 * This code is mostly from the old Etherpad. Please help us to comment this code. 
 * This helps other people to understand this code better and helps them to improve it.
 * TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
 */

/**
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// requires: top
// requires: plugins
// requires: undefined

Ace2Editor.registry = {
  nextId: 1
};

function Ace2Editor()
{
  var thisFunctionsName = "Ace2Editor";
  var ace2 = Ace2Editor;

  var editor = {};
  var info = {
    editor: editor,
    id: (ace2.registry.nextId++)
  };
  var loaded = false;

  var actionsPendingInit = [];

  function pendingInit(func, optDoNow)
  {
    return function()
    {
      var that = this;
      var args = arguments;

      function action()
      {
        func.apply(that, args);
      }
      if (optDoNow)
      {
        optDoNow.apply(that, args);
      }
      if (loaded)
      {
        action();
      }
      else
      {
        actionsPendingInit.push(action);
      }
    };
  }

  function doActionsPendingInit()
  {
    for (var i = 0; i < actionsPendingInit.length; i++)
    {
      actionsPendingInit[i]();
    }
    actionsPendingInit = [];
  }

  ace2.registry[info.id] = info;

  editor.importText = pendingInit(function(newCode, undoable)
  {
    info.ace_importText(newCode, undoable);
  });
  editor.importAText = pendingInit(function(newCode, apoolJsonObj, undoable)
  {
    info.ace_importAText(newCode, apoolJsonObj, undoable);
  });
  editor.exportText = function()
  {
    if (!loaded) return "(awaiting init)\n";
    return info.ace_exportText();
  };
  editor.getFrame = function()
  {
    return info.frame || null;
  };
  editor.focus = pendingInit(function()
  {
    info.ace_focus();
  });
  editor.setEditable = pendingInit(function(newVal)
  {
    info.ace_setEditable(newVal);
  });
  editor.getFormattedCode = function()
  {
    return info.ace_getFormattedCode();
  };
  editor.setOnKeyPress = pendingInit(function(handler)
  {
    info.ace_setOnKeyPress(handler);
  });
  editor.setOnKeyDown = pendingInit(function(handler)
  {
    info.ace_setOnKeyDown(handler);
  });
  editor.setNotifyDirty = pendingInit(function(handler)
  {
    info.ace_setNotifyDirty(handler);
  });

  editor.setProperty = pendingInit(function(key, value)
  {
    info.ace_setProperty(key, value);
  });
  editor.getDebugProperty = function(prop)
  {
    return info.ace_getDebugProperty(prop);
  };

  editor.setBaseText = pendingInit(function(txt)
  {
    info.ace_setBaseText(txt);
  });
  editor.setBaseAttributedText = pendingInit(function(atxt, apoolJsonObj)
  {
    info.ace_setBaseAttributedText(atxt, apoolJsonObj);
  });
  editor.applyChangesToBase = pendingInit(function(changes, optAuthor, apoolJsonObj)
  {
    info.ace_applyChangesToBase(changes, optAuthor, apoolJsonObj);
  });
  // prepareUserChangeset:
  // Returns null if no new changes or ACE not ready.  Otherwise, bundles up all user changes
  // to the latest base text into a Changeset, which is returned (as a string if encodeAsString).
  // If this method returns a truthy value, then applyPreparedChangesetToBase can be called
  // at some later point to consider these changes part of the base, after which prepareUserChangeset
  // must be called again before applyPreparedChangesetToBase.  Multiple consecutive calls
  // to prepareUserChangeset will return an updated changeset that takes into account the
  // latest user changes, and modify the changeset to be applied by applyPreparedChangesetToBase
  // accordingly.
  editor.prepareUserChangeset = function()
  {
    if (!loaded) return null;
    return info.ace_prepareUserChangeset();
  };
  editor.applyPreparedChangesetToBase = pendingInit(

  function()
  {
    info.ace_applyPreparedChangesetToBase();
  });
  editor.setUserChangeNotificationCallback = pendingInit(function(callback)
  {
    info.ace_setUserChangeNotificationCallback(callback);
  });
  editor.setAuthorInfo = pendingInit(function(author, authorInfo)
  {
    info.ace_setAuthorInfo(author, authorInfo);
  });
  editor.setAuthorSelectionRange = pendingInit(function(author, start, end)
  {
    info.ace_setAuthorSelectionRange(author, start, end);
  });

  editor.getUnhandledErrors = function()
  {
    if (!loaded) return [];
    // returns array of {error: <browser Error object>, time: +new Date()}
    return info.ace_getUnhandledErrors();
  };

  editor.callWithAce = pendingInit(function(fn, callStack, normalize)
  {
    return info.ace_callWithAce(fn, callStack, normalize);
  });

  editor.execCommand = pendingInit(function(cmd, arg1)
  {
    info.ace_execCommand(cmd, arg1);
  });
  editor.replaceRange = pendingInit(function(start, end, text)
  {
    info.ace_replaceRange(start, end, text);
  });


  // calls to these functions ($$INCLUDE_...)  are replaced when this file is processed
  // and compressed, putting the compressed code from the named file directly into the
  // source here.
  var $$INCLUDE_CSS = function(fileName)
    {
      return '<link rel="stylesheet" type="text/css" href="' + fileName + '"/>';
      };
  var $$INCLUDE_JS = function(fileName)
    {
      return '\x3cscript type="text/javascript" src="' + fileName + '">\x3c/script>';
      };
  var $$INCLUDE_JS_DEV = $$INCLUDE_JS;
  var $$INCLUDE_CSS_DEV = $$INCLUDE_CSS;

  var $$INCLUDE_CSS_Q = function(fileName)
    {
      return '\'<link rel="stylesheet" type="text/css" href="' + fileName + '"/>\'';
      };
  var $$INCLUDE_JS_Q = function(fileName)
    {
      return '\'\\x3cscript type="text/javascript" src="' + fileName + '">\\x3c/script>\'';
      };
  var $$INCLUDE_JS_Q_DEV = $$INCLUDE_JS_Q;
  var $$INCLUDE_CSS_Q_DEV = $$INCLUDE_CSS_Q;

  editor.destroy = pendingInit(function()
  {
    info.ace_dispose();
    info.frame.parentNode.removeChild(info.frame);
    delete ace2.registry[info.id];
    info = null; // prevent IE 6 closure memory leaks
  });

  editor.init = function(containerId, initialCode, doneFunc)
  {

    editor.importText(initialCode);

    info.onEditorReady = function()
    {
      loaded = true;
      doActionsPendingInit();
      doneFunc();
    };

    (function()
    {
      var doctype = "<!doctype html>";

      var iframeHTML = ["'" + doctype + "<html><head>'"];

      plugins.callHook("aceInitInnerdocbodyHead", {
        iframeHTML: iframeHTML
      });

      // these lines must conform to a specific format because they are passed by the build script:      
      iframeHTML.push($$INCLUDE_CSS_Q("../static/css/iframe_editor.css"));
      iframeHTML.push($$INCLUDE_CSS_Q("../static/css/pad.css"));
      iframeHTML.push($$INCLUDE_CSS_Q("../static/custom/pad.css"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/ace2_common.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/skiplist.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/virtual_lines.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/easysync2.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/cssmanager.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/colorutils.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/undomodule.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/contentcollector.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/changesettracker.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/linestylefilter.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/domline.js"));
      iframeHTML.push($$INCLUDE_JS_Q("../static/js/ace2_inner.js"));

      iframeHTML.push('\'\\n<style type="text/css" title="dynamicsyntax"></style>\\n\'');
      iframeHTML.push('\'</head><body id="innerdocbody" class="syntax" spellcheck="false">&nbsp;</body></html>\'');

      var outerScript = 'editorId = "' + info.id + '"; editorInfo = parent.' + thisFunctionsName + '.registry[editorId]; ' + 'window.onload = function() ' + '{ window.onload = null; setTimeout' + '(function() ' + '{ var iframe = document.createElement("IFRAME"); ' + 'iframe.scrolling = "no"; var outerdocbody = document.getElementById("outerdocbody"); ' + 'iframe.frameBorder = 0; iframe.allowTransparency = true; ' + // for IE
      'outerdocbody.insertBefore(iframe, outerdocbody.firstChild); ' + 'iframe.ace_outerWin = window; ' + 'readyFunc = function() { editorInfo.onEditorReady(); readyFunc = null; editorInfo = null; }; ' + 'var doc = iframe.contentWindow.document; doc.open(); var text = (' + iframeHTML.join('+') + ').replace(/\\\\x3c/g, \'<\');doc.write(text); doc.close(); ' + '}, 0); }';

      var outerHTML = [doctype, '<html><head>', $$INCLUDE_CSS("../static/css/iframe_editor.css"), $$INCLUDE_CSS("../static/css/pad.css"), $$INCLUDE_CSS("../static/custom/pad.css"),
      // bizarrely, in FF2, a file with no "external" dependencies won't finish loading properly
      // (throbs busy while typing)
      '<link rel="stylesheet" type="text/css" href="data:text/css,"/>', '\x3cscript>\n', outerScript, '\n\x3c/script>', '</head><body id="outerdocbody"><div id="sidediv"><!-- --></div><div id="linemetricsdiv">x</div><div id="overlaysdiv"><!-- --></div></body></html>'];

      if (!Array.prototype.map) Array.prototype.map = function(fun)
      { //needed for IE
        if (typeof fun != "function") throw new TypeError();
        var len = this.length;
        var res = new Array(len);
        var thisp = arguments[1];
        for (var i = 0; i < len; i++)
        {
          if (i in this) res[i] = fun.call(thisp, this[i], i, this);
        }
        return res;
      };

      var outerFrame = document.createElement("IFRAME");
      outerFrame.frameBorder = 0; // for IE
      info.frame = outerFrame;
      document.getElementById(containerId).appendChild(outerFrame);

      var editorDocument = outerFrame.contentWindow.document;

      editorDocument.open();
      editorDocument.write(outerHTML.join(''));
      editorDocument.close();
    })();
  };

  return editor;
}