/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (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.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s):
 *   Blake Ross <blakeross@telocity.com>
 *   Peter Annema <disttsc@bart.nl>
 */

function nsBrowserStatusHandler()
{
  this.init();
}

nsBrowserStatusHandler.prototype =
{
  useRealProgressFlag : false,
  totalRequests : 0,
  finishedRequests : 0,

  // Stored Status, Link and Loading values
  status : "",
  defaultStatus : "",
  jsStatus : "",
  jsDefaultStatus : "",
  overLink : "",
  startTime : 0,

  statusTimeoutInEffect : false,

  hideAboutBlank : true,

  QueryInterface : function(aIID)
  {
    if (aIID.equals(Components.interfaces.nsIWebProgressListener) ||
        aIID.equals(Components.interfaces.nsISupportsWeakReference) ||
        aIID.equals(Components.interfaces.nsIXULBrowserWindow) ||
        aIID.equals(Components.interfaces.nsISupports))
      return this;
    throw Components.results.NS_NOINTERFACE;
  },

  init : function()
  {
    // XXXjag is this still needed? It's currently just ""
    this.defaultStatus = gNavigatorBundle.getString("defaultStatus");

    this.urlBar          = document.getElementById("urlbar");
    this.throbberElement = document.getElementById("navigator-throbber");
    this.statusMeter     = document.getElementById("statusbar-icon");
    this.stopButton      = document.getElementById("stop-button");
    this.stopMenu        = document.getElementById("menuitem-stop");
    this.stopContext     = document.getElementById("context-stop");
    this.statusTextField = document.getElementById("statusbar-display");

  },

  destroy : function()
  {
    // XXXjag to avoid leaks :-/, see bug 60729
    this.urlBar          = null;
    this.throbberElement = null;
    this.statusMeter     = null;
    this.stopButton      = null;
    this.stopMenu        = null;
    this.stopContext     = null;
    this.statusTextField = null;
  },

  setJSStatus : function(status)
  {
    this.jsStatus = status;
    this.updateStatusField();
    // set empty so defaults show up next change
    this.jsStatus = "";
  },

  setJSDefaultStatus : function(status)
  {
    this.jsDefaultStatus = status;
    this.updateStatusField();
  },

  setDefaultStatus : function(status)
  {
    this.defaultStatus = status;
    this.updateStatusField();
  },

  setOverLink : function(link, b)
  {
    this.overLink = link;
    this.updateStatusField();
    // set empty so defaults show up next change
    this.overLink = "";
  },

  updateStatusField : function()
  {
    var text = this.overLink || this.status || this.jsStatus || this.jsDefaultStatus || this.defaultStatus;

    // check the current value so we don't trigger an attribute change
    // and cause needless (slow!) UI updates
    if (this.statusTextField.label != text) {
      this.statusTextField.label = text;
    }
  },

  onProgressChange : function (aWebProgress, aRequest,
                               aCurSelfProgress, aMaxSelfProgress,
                               aCurTotalProgress, aMaxTotalProgress)
  {
    if (!this.useRealProgressFlag && aRequest)
      return;

    if (aMaxTotalProgress > 0) {
      this.statusMeter.mode = "normal";

      // This is highly optimized.  Don't touch this code unless
      // you are intimately familiar with the cost of setting
      // attrs on XUL elements. -- hyatt
      var percentage = (aCurTotalProgress * 100) / aMaxTotalProgress;
      this.statusMeter.value = percentage;
    } else {
      this.statusMeter.mode = "undetermined";
    }
  },

  onStateChange : function(aWebProgress, aRequest, aStateFlags, aStatus)
  {
    if (!aRequest)
      return;

    const nsIWebProgressListener = Components.interfaces.nsIWebProgressListener;
    const nsIChannel = Components.interfaces.nsIChannel;
    var domWindow;
    if (aStateFlags & nsIWebProgressListener.STATE_START) {
      if (aStateFlags & nsIWebProgressListener.STATE_IS_NETWORK) {
        // Remember when loading commenced.
        this.startTime = (new Date()).getTime();

        domWindow = aWebProgress.DOMWindow;
        if (domWindow == _content)
          this.startDocumentLoad(aRequest);

        // Turn progress meter on.
        this.statusMeter.mode = "undetermined";
        this.throbberElement.setAttribute("busy", true);

        // XXX: These need to be based on window activity...
        this.stopButton.disabled = false;
        this.stopMenu.disabled = false;
        this.stopContext.disabled = false;

        // Initialize the progress stuff...
        this.useRealProgressFlag = false;
        this.totalRequests = 0;
        this.finishedRequests = 0;
      }

      if (aStateFlags & nsIWebProgressListener.STATE_IS_REQUEST) {
        this.totalRequests += 1;
      }
    }
    else if (aStateFlags & nsIWebProgressListener.STATE_STOP) {
      if (aStateFlags & nsIWebProgressListener.STATE_IS_REQUEST) {
        this.finishedRequests += 1;
        if (!this.useRealProgressFlag)
          this.onProgressChange(null, null, 0, 0, this.finishedRequests, this.totalRequests);
      }
      if (aStateFlags & nsIWebProgressListener.STATE_IS_NETWORK) {
        domWindow = aWebProgress.DOMWindow;
        if (domWindow == domWindow.top)
          this.endDocumentLoad(aRequest, aStatus);

        var location = aRequest.QueryInterface(nsIChannel).URI.spec;
        var msg = "";
        if (location != "about:blank") {
          // Record page loading time.
          var elapsed = ((new Date()).getTime() - this.startTime) / 1000;
          msg = gNavigatorBundle.getString("nv_done");
          msg = msg.replace(/%elapsed%/, elapsed);
        }
        this.status = "";
        this.setDefaultStatus(msg);

        // Turn progress meter off.
        this.statusMeter.mode = "normal";
        this.statusMeter.value = 0;  // be sure to clear the progress bar
        this.throbberElement.removeAttribute("busy");

        // XXX: These need to be based on window activity...
        // XXXjag: <command id="cmd_stop"/> ?
        this.stopButton.disabled = true;
        this.stopMenu.disabled = true;
        this.stopContext.disabled = true;

      }
    }
    else if (aStateFlags & nsIWebProgressListener.STATE_TRANSFERRING) {
      if (aStateFlags & nsIWebProgressListener.STATE_IS_DOCUMENT) {
        var ctype = aRequest.QueryInterface(nsIChannel).contentType;

        if (ctype != "text/html")
          this.useRealProgressFlag = true;

        this.statusMeter.mode = "normal";
      }

      if (aStateFlags & nsIWebProgressListener.STATE_IS_REQUEST) {
        if (!this.useRealProgressFlag)
          this.onProgressChange(null, null, 0, 0, this.finishedRequests, this.totalRequests);
      }
    }
  },

  onLocationChange : function(aWebProgress, aRequest, aLocation)
  {
    var location = aLocation.spec;

    if (this.hideAboutBlank) {
      this.hideAboutBlank = false;
      if (location == "about:blank")
        location = "";
    }

    // We should probably not do this if the value has changed since the user
    // searched
    this.urlBar.value = location;
    SetPageProxyState("valid");
    
    UpdateBackForwardButtons();
  },

  onStatusChange : function(aWebProgress, aRequest, aStatus, aMessage)
  {
    if (!this.statusTimeoutInEffect) {
      this.statusTimeoutInEffect = true;
      this.status = aMessage;
      this.updateStatusField();
      setTimeout(function(aClosure) { aClosure.statusTimeoutInEffect = false; }, 400, this);
    }
  },

  onSecurityChange : function(aWebProgress, aRequest, aState)
  {
    throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
  },

  startDocumentLoad : function(aRequest)
  {
    const nsIChannel = Components.interfaces.nsIChannel;
    var urlStr = aRequest.QueryInterface(nsIChannel).URI.spec;
    var observerService = Components.classes["@mozilla.org/observer-service;1"]
                                    .getService(Components.interfaces.nsIObserverService);
    try {
      observerService.Notify(_content, "StartDocumentLoad", urlStr);
    } catch (e) {
    }
  },

  endDocumentLoad : function(aRequest, aStatus)
  {
    const nsIChannel = Components.interfaces.nsIChannel;
    var urlStr = aRequest.QueryInterface(nsIChannel).originalURI.spec;

    if (Components.isSuccessCode(aStatus))
      dump("Document "+urlStr+" loaded successfully\n"); // per QA request
    else
      dump("Error loading URL "+urlStr+" : "+aStatus+"\n"); // per QA request

    var observerService = Components.classes["@mozilla.org/observer-service;1"]
                                    .getService(Components.interfaces.nsIObserverService);

    var notification = Components.isSuccessCode(aStatus) ? "EndDocumentLoad" : "FailDocumentLoad";
    try {
      observerService.Notify(_content, notification, urlStr);
    } catch (e) {
    }
  }
}