//    Licensed Materials - Property of IBM
//
//    IBM Cognos Products: cogadmin
//
//    (C) Copyright IBM Corp. 2005, 2012
//
//    US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
//
//
/**
 * Attach an event to the given element
 * capture flag is not specified
 * @param object
 * @param eventType
 * @param func
 * @return
 */
function addEventToObject(object, eventType, func){
  var isEventAdded = false;
  
  if (object && eventType && func) {
    eventType = eventType.toLowerCase();
    if (object.addEventListener){ 
      object.addEventListener(eventType, func, false); 
      isEventAdded = true; 
    } else if (object.attachEvent){ 
      isEventAdded = object.attachEvent("on" + eventType, func); 
    }
  }
  return isEventAdded;
}


/*
This class allows a fragment to be embedded in any html document
*/

/**
 * Constructor
 * The parameters are either: 
 * An object with the following attribute: 
 * gateway: path to the gateway [mandatory]
 * webRoot: path to the webroot [mandatory]
 * skinRoot: path to the skin root [optional for backward compatibility]
 * 
 * 
 */
function FragmentEmbedder() {
  var args = arguments;
  this._configuration = null;
  this._frags = [];
  this._loadedScripts = 0;
  this._loadedCssStyles = 0;
  this._retrievedFragments = 0;
  
  //for backward compatibility
  if (args && args.length == 1 && typeof args[0] != 'string') {
    this._configuration = args[0];
  } else if (args && args.length >= 2) {
    this._configuration = {"gateway":args[0],"webRoot":args[1]};
  }
  
  var _self = this;
  FragmentEmbedder.ERROR_UNDEFINED_CONF     = "Illegal Argument Exception: No configuration is defined";
  FragmentEmbedder.ERROR_UNDEFINED_GATEWAY  = "Illegal Argument Exception: No gateway is defined";
  FragmentEmbedder.ERROR_UNDEFINED_WEBROOT  = "Illegal Argument Exception: No webRoot is defined";
  FragmentEmbedder.ERROR_UNDEFINED_FRAGDEF  = "Illegal Argument Exception: No fragment definition is defined";
  
  /**
   * verifies the configuration
   */
  this._verifyConfiguration = function() {
    if (!_self._configuration || _self._configuration == null) {
      throw FragmentEmbedder.ERROR_UNDEFINED_CONF;
    }
    if (_self._configuration.gateway == null || _self._configuration.gateway == "") {
      throw FragmentEmbedder.ERROR_UNDEFINED_GATEWAY;
    }
    if (_self._configuration.webRoot == null) {
      throw FragmentEmbedder.ERROR_UNDEFINED_WEBROOT;
    }
  }
  
  this._verifyConfiguration();
  
  var scripts = [ 
    this._configuration.webRoot+'/dojo16/dojo/dojo.js',
    this._configuration.webRoot+'/fragments/xdojo/core.js',
    this._configuration.gateway+'/dashboard/messages/messages/pfmessages?section=JS,GEN',
    this._configuration.webRoot+'/fragments/fragments.js',
    this._configuration.webRoot+'/common/framework/validator/CValidator.js',
    this._configuration.webRoot+'/fragments/uicommon.js'
  ];
  
  /**
   * The following stylesheet is required when showing the details of an error. 
   */
  var cssStyles = [ 
    this._configuration.skinRoot+'/fragments/portlet.css'               
  ];
  
    
  /**
   * This method registers a fragment to be loaded; the parameter is either an object or a sequence of 3 strings: 
   * fragUrl: url for the fragment
   * fragDivId: id of the fragment div,
   * retrieveParams: string or function providing the parameters to pass when retrieving the fragment
   * It is recommended to use the object
   */
  this.embed = function () {
    var fragDef = null;
    var args = arguments;

    if (!args || args.length == 0) {
      throw FragmentEmbedder.ERROR_UNDEFINED_FRAGDEF;
    } 
    if (args.length == 1 && typeof args[0] != 'string') {
      _self._frags[_self._frags.length] = args[0];
    } else {
      fragDef = {};
      if (args[0]) {
        fragDef.fragUrl = args[0]; 
      } else {
        fragDef.fragUrl = null;
      }
      if (args[1]) {
        fragDef.fragDivId = args[1];
      } else {
        fragDef.fragDivId = null;
      }
      if (args[2]) {
        fragDef.retrieveParams = args[2];
      } else {
        fragDef.retrieveParams = null;
      }
      _self._frags[_self._frags.length] = fragDef;
    }
    /*
     * We return the fragDef object, but it should be treated as an opaque object by the client
     */
    return _self._frags[_self._frags.length];
  }
  
  /**
   * This methods loads the embedded fragments
   * the onload parameter is a flag indicating whether or not the load has to happen once the page is loaded
   */
  this.loadFragments = function(onLoad) {
    if (onLoad) {
      addEventToObject(window,"load",function() {_self._loadScriptsAndFragments();});
    } else {
      this._loadScriptsAndFragments();
    }
  }
  /**
   * This method raised the specified event on the specified embedded fragment
   */
  this.raiseEvent = function(fragDef, eventName, payload, type){
	  fragDef.raiseEvent(eventName, payload, type);
  }
  
  /**
   * This method loads the necessary scripts, css stylesheets and then the fragments
   */
  this._loadScriptsAndFragments = function() {
    if (_self._loadedScripts < scripts.length) {
      _self._loadScript(scripts[_self._loadedScripts++],_self._loadScriptsAndFragments);
    } else if (_self._loadedCssStyles < cssStyles.length) {
        _self._loadCssStyle(cssStyles[_self._loadedCssStyles++],_self._loadScriptsAndFragments);
    } else {
      _self._loadFrags();
    }
  }
  
  this._canShowErrorDetails = function() {
    var canShow = false;
    if (_self._configuration.skinRoot) {
      canShow = true;
    }
    return canShow;
  }
  
  this._loadFrags = function() {
    if (!window._F_Config) {
      _F_Config = new Object();
    }
    _F_Config.gateway = _self._configuration.gateway;
    _F_Config.application = "/cogadmin";
    _F_Config.webContent = _self._configuration.webRoot;
    if (_self._canShowErrorDetails()) {
      ui_error.prototype.template = '<div id="_THIS_errormsg"></div><div><a id="_THIS_error_showdetails">' + PFM.GEN.IDS_GEN_DETAILS + '</a></div>';
    } else {
      ui_error.prototype.template = '<div id="_THIS_errormsg"></div>';
    }
    for (var i=0;i<_self._frags.length;i++) {
      _self._fragInit(_self._frags[i]);
    }
    this._retrieveFragment();
  }

  this._isScriptLoaded = function(src) {
    return this._isFileLoaded("src",src);
  }
  
  this._isCssStyleLoaded = function(src) {
      return this._isFileLoaded("href",src);
  }
  
  this._isFileLoaded = function(attribute,value) {
    var head = document.getElementsByTagName("head")[0];
    var isLoaded = false;
    var i=0;
    
    while (i<head.childNodes.length && !isLoaded) {
        isLoaded = (head.childNodes[i].attributes != null)
                    && (head.childNodes[i].attributes[attribute] != null)
                    && (value==head.childNodes[i].attributes[attribute].value);
      i++;
    }
    return isLoaded;
  }
  
  this._loadScript = function(scriptUrl,onloadHandler) {
    if (_self._isScriptLoaded(scriptUrl)) {
      if (onloadHandler) {
        onloadHandler();
      }
    } else {
      var s = document.createElement("script");
      s.src = scriptUrl;
      s.type="text/javascript";
      if (onloadHandler) {
        s.onload=onloadHandler; //Firefox
        s.onreadystatechange = function() { //IE
          if (this.readyState == 'complete' || this.readyState == 'loaded') {
            onloadHandler();
          }
        }
      }
      document.getElementsByTagName("head")[0].appendChild(s);
    }
  }
  
  this._loadCssStyle = function(cssStyleUrl,onloadHandler) {
    if (!_self._isCssStyleLoaded(cssStyleUrl)) {
      var node = document.createElement("link");
      node.type = 'text/css';
      node.rel = "stylesheet"
      node.href = cssStyleUrl;
      document.getElementsByTagName("head")[0].appendChild(node);
    }
    if (onloadHandler) {
      onloadHandler();
    }
  }

  this._addFragContentDiv = function(frag) {
    var fragId=frag.id;
    var contentId = fragId+'content';
    var contentDiv = $(contentId);
    
    if (!contentDiv) {
      contentDiv = document.createElement("div");
      contentDiv.id = contentId;
      contentDiv.className = "boxBody";
      $(fragId).appendChild(contentDiv);
    }
    var waitDiv = ui_templates.get(
        ui_templates.contentTemplate, 
        'CONTENTID', fragId + "wait", 
        'CONTENTCLASS', 'cogstyle-htabs-page-content'
      );
    contentDiv.innerHTML = waitDiv;
    return contentDiv;
  }
  
  this._generateRetrieveParams = function(registeredFrag) {
    var params = null;
    if (registeredFrag.retrieveParams) {
      if (typeof registeredFrag.retrieveParams == "string"){
      params = registeredFrag.retrieveParams;
      } else if (typeof registeredFrag.retrieveParams == "function") {
      params = registeredFrag.retrieveParams();
      } else {
      //unknown type: ignore it
        _F_log("W", "embedFragment(): Unsupported value for the retrieve params: " + registeredFrag.retrieveParams);
      }
    }
    return params;
  }
  
  this._fragInit = function(registeredFrag) {
    var params = null;
    fragDiv = $(registeredFrag.fragDivId);
    if (!fragDiv) {
      _F_log("E", "embedFragment(): DOM element not found for fragDivId="+registeredFrag.fragDivId);
    } else {
      _F_init();
      embeddedFrag = new fragment(registeredFrag.fragUrl, registeredFrag.fragDivId);
      embeddedFrag.setOnloadHandler(ui_init);
      embeddedFrag.div = _self._addFragContentDiv(embeddedFrag);
      embeddedFrag.addEventListener("fragment.retrieve.after",this._postFragRetrieve,false);
      registeredFrag.fragment = embeddedFrag;
    }
  }
  
  this._retrieveFragment = function() {
    var registeredFrag = null;
    var params = null;
    
    if (this._retrievedFragments < this._frags.length) {
      registeredFrag = this._frags[this._retrievedFragments];
      this._retrievedFragments++;
      if (registeredFrag.fragment) {
        params = _self._generateRetrieveParams(registeredFrag);
        registeredFrag.fragment.retrieve(params);
      } else {
        this._retrieveFragment();
      }
    }
  }
  
  this._postFragRetrieve = function(event) {
    var fragContentDiv = null;
    
    if (event && event.source && event.source.error) {
      fragContentDiv = $(event.source.div);
      if (fragContentDiv) {
        fragContentDiv.style.display = "none";
      }
    }
    _self._retrieveFragment();
  }
}