/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 ui.js.
 *
 * The Initial Developer of the Original Code is
 * Ian Gilman <ian@iangilman.com>.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * Aza Raskin <aza@mozilla.com>
 * Michael Yoshitaka Erlewine <mitcho@mitcho.com>
 * Ehsan Akhgari <ehsan@mozilla.com>
 * Raymond Lee <raymond@appcoast.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

// **********
// Title: ui.js 

(function(){

window.Keys = {meta: false};

// ##########
Navbar = {
  // ----------
  get el(){
    var win = Utils.getCurrentWindow();
    if(win) {
      var navbar = win.gBrowser.ownerDocument.getElementById("navigator-toolbox");
      return navbar;      
    }

    return null;
  },
  
  get urlBar(){
    var win = Utils.getCurrentWindow();
    if(win) {
      var navbar = win.gBrowser.ownerDocument.getElementById("urlbar");
      return navbar;      
    }

    return null;    
  }
};

// ##########
// Class: Tabbar
// Singleton for managing the tabbar of the browser. 
var Tabbar = {
  // ----------
  get el() {
    return window.Tabs[0].raw.parentNode; 
  },

  // ----------
  get height() {
    return window.Tabs[0].raw.parentNode.getBoundingClientRect().height;
  },
  
  // ----------
  // Function: getVisibleTabs
  // Returns an array of the tabs which are currently visibible in the
  // tab bar.
  getVisibleTabs: function(){
    var visibleTabs = [];
    // this.el.children is not a real array and does contain
    // useful functions like filter or forEach. Convert it into a real array.
    for( var i=0; i<this.el.children.length; i++ ){
      var tab = this.el.children[i];
      if( tab.collapsed == false )
        visibleTabs.push();
    }
    
    return visibleTabs;
  },
  
  // ----------
  // Function: showOnlyTheseTabs
  // Hides all of the tabs in the tab bar which are not passed into this function.
  //
  // Paramaters
  //  - An array of <Tab> objects.
  showOnlyTheseTabs: function(tabs, options){
    try { 
      if(!options)
        options = {};
          
      var visibleTabs = [];
      // this.el.children is not a real array and does contain
      // useful functions like filter or forEach. Convert it into a real array.
      var tabBarTabs = [];
      for( var i=0; i<this.el.children.length; i++ ){
        tabBarTabs.push(this.el.children[i]);
      }
      
      for each( var tab in tabs ){
        var rawTab = tab.tab.raw;
        var toShow = tabBarTabs.filter(function(testTab){
          return testTab == rawTab;
        }); 
        visibleTabs = visibleTabs.concat( toShow );
      }
  
      tabBarTabs.forEach(function(tab){
        tab.collapsed = true;
      });
      
      // Show all of the tabs in the group and move them (in order)
      // that they appear in the group to the end of the tab strip.
      // This way the tab order is matched up to the group's thumbnail
      // order.
      var self = this;
      visibleTabs.forEach(function(tab){
        tab.collapsed = false;
        
        if(!options.dontReorg)
          Utils.getCurrentWindow().gBrowser.moveTabTo(tab, self.el.children.length-1);
      });
    } catch(e) {
      Utils.log(e);
    }
  },

  // ----------
  // Function: showAllTabs
  // Shows all of the tabs in the tab bar.
  showAllTabs: function(){
    for( var i=0; i<this.el.children.length; i++ ){
      var tab = this.el.children[i];
      tab.collapsed = false;
    }
  }
}

// ##########
// Class: Page
// Singleton top-level UI manager. TODO: Integrate with <UIClass>.  
window.Page = {
  startX: 30, 
  startY: 70,
  
  isTabCandyVisible: function(){
    return (Utils.getCurrentWindow().document.getElementById("tab-candy-deck").
             selectedIndex == 1);
  },
  
  hideChrome: function(){
    let currentWin = Utils.getCurrentWindow();
    currentWin.document.getElementById("tab-candy-deck").selectedIndex = 1;    
    
    // Mac Only
    Utils.getCurrentWindow().document.getElementById("main-window").
      setAttribute("activetitlebarcolor", "#C4C4C4");
  },
  
  showChrome: function(){
    let currentWin = Utils.getCurrentWindow();
    currentWin.document.getElementById("tab-candy-deck").selectedIndex = 0;
    
    // Mac Only
    Utils.getCurrentWindow().document.getElementById("main-window").
      removeAttribute("activetitlebarcolor");
  },

  showTabCandy : function() {
    let self = this;

    let currentTab = UI.currentTab;
    let item = null;

    if(currentTab && currentTab.mirror)
      item = TabItems.getItemByTabElement(currentTab.mirror.el);

    if(item) {
      // If there was a previous currentTab we want to animate
      // its mirror for the zoom out.
      // Note that we start the animation on the chrome thread.

      // Zoom out!
      item.zoomOut(function() {
        if(!currentTab.mirror) // if the tab's been destroyed
          item = null;

        self.setActiveTab(item);

        let activeGroup = Groups.getActiveGroup();
        if( activeGroup )
          activeGroup.setTopChild(item);
  
        window.Groups.setActiveGroup(null);
        UI.resize(true);
      });
    }
  },
  
  setupKeyHandlers: function(){
    var self = this;
    iQ(window).keyup(function(e){
      if( e.metaKey == false ) window.Keys.meta = false;
    });
    
    iQ(window).keydown(function(e){
      if( e.metaKey == true ) window.Keys.meta = true;
      
      if( !self.getActiveTab() ) return;
      
      var centers = [[item.bounds.center(), item] for each(item in TabItems.getItems())];
      myCenter = self.getActiveTab().bounds.center();

      function getClosestTabBy(norm){
        var matches = centers
          .filter(function(item){return norm(item[0], myCenter)})
          .sort(function(a,b){
            return myCenter.distance(a[0]) - myCenter.distance(b[0]);
          });
        if( matches.length > 0 ) return matches[0][1];
        else return null;
      }

      var norm = null;
      switch(e.which){
        case 39: // Right
          norm = function(a, me){return a.x > me.x};
          break;
        case 37: // Left
          norm = function(a, me){return a.x < me.x};
          break;
        case 40: // Down
          norm = function(a, me){return a.y > me.y};
          break;
        case 38: // Up
          norm = function(a, me){return a.y < me.y}
          break;
        case 69: // Command-E
          if( Keys.meta ) if( self.getActiveTab() ) self.getActiveTab().zoomIn();
          break;
      }
      
      if( norm != null && iQ(":focus").length == 0 ){
        var nextTab = getClosestTabBy(norm);
        if( nextTab ){
          if( nextTab.inStack() && !nextTab.parent.expanded){
            nextTab = nextTab.parent.getChild(0);
          }
          self.setActiveTab(nextTab);           
        }
        e.preventDefault();               
      }
      
      if((e.which == 27 || e.which == 13) && iQ(":focus").length == 0 )
        if( self.getActiveTab() ) self.getActiveTab().zoomIn();
    });
    
  },
    
  // ----------  
  init: function() {
    var self = this;
        
    // When you click on the background/empty part of TabCandy
    // we create a new group.
    let tabCandyContentDoc =
      Utils.getCurrentWindow().document.getElementById("tab-candy").
        contentDocument;
    iQ(tabCandyContentDoc).mousedown(function(e){
      if( e.originalTarget.id == "bg" )
        Page.createGroupOnDrag(e)
    });

    this.setupKeyHandlers();
        
    Tabs.onClose(function(){
      if (!self.isTabCandyVisible()) {
        iQ.timeout(function() { // Marshal event from chrome thread to DOM thread            
          // Only go back to the TabCandy tab when there you close the last
          // tab of a group.
          var group = Groups.getActiveGroup();
          if( group && group._children.length == 0 ) {
            self.hideChrome();
            self.showTabCandy();
          }
    
          // Take care of the case where you've closed the last tab in
          // an un-named group, which means that the group is gone (null) and
          // there are no visible tabs.
          if( group == null && Tabbar.getVisibleTabs().length == 0){
            self.hideChrome();
            self.showTabCandy();
          }
        }, 1);
      }
      return false;
    });
    
    Tabs.onMove(function() {
      iQ.timeout(function() { // Marshal event from chrome thread to DOM thread
        var activeGroup = Groups.getActiveGroup();
        if( activeGroup )
          activeGroup.reorderBasedOnTabOrder();                
      }, 1);
    });
    
    Tabs.onFocus(function() {
      self.tabOnFocus(this);
    });
  },

  // ----------  
  tabOnFocus: function(tab) {
    var focusTab = tab;
    var currentTab = UI.currentTab;
    
    UI.currentTab = focusTab;
    if (this.isTabCandyVisible()) {
      this.showChrome();    
    }

    iQ.timeout(function() { // Marshal event from chrome thread to DOM thread
      if(focusTab != UI.currentTab) {
        // things have changed while we were in timeout
        return;
      }
       
      let newItem = null;
      if(focusTab && focusTab.mirror)
        newItem = TabItems.getItemByTabElement(focusTab.mirror.el);

      if(newItem)
        Groups.setActiveGroup(newItem.parent);

      // ___ prepare for when we return to TabCandy
      let oldItem = null;
      if(currentTab && currentTab.mirror)
        oldItem = TabItems.getItemByTabElement(currentTab.mirror.el);

      if(newItem != oldItem) {
        if(oldItem)
          oldItem.setZoomPrep(false);

        if(newItem)
          newItem.setZoomPrep(true);
      } else {
        // the tab is already focused so the new and old items are the
        // same.
        if (oldItem) {
          oldItem.setZoomPrep(true);
        }
      }
    }, 1);
  },

  // ----------  
  createGroupOnDrag: function(e){
/*     e.preventDefault(); */
    const minSize = 60;
    const minMinSize = 15;
    
    var startPos = {x:e.clientX, y:e.clientY}
    var phantom = iQ("<div>")
      .addClass('group phantom')
      .css({
        position: "absolute",
        opacity: .7,
        zIndex: -1,
        cursor: "default"
      })
      .appendTo("body");

    var item = { // a faux-Item
      container: phantom,
      isAFauxItem: true,
      bounds: {},
      getBounds: function FauxItem_getBounds() {
        return this.container.bounds();
      },
      setBounds: function FauxItem_setBounds( bounds ) {
        this.container.css( bounds );
      },
      setZ: function FauxItem_setZ( z ) {
        this.container.css( 'z-index', z );
      },
      setOpacity: function FauxItem_setOpacity( opacity ) {
        this.container.css( 'opacity', opacity );
      },
      // we don't need to pushAway the phantom item at the end, because 
      // when we create a new Group, it'll do the actual pushAway.
      pushAway: function () {},
    };
    item.setBounds( new Rect( startPos.y, startPos.x, 0, 0 ) );
    
    var dragOutInfo = new Drag(item, e, true); // true = isResizing
    
    function updateSize(e){
      var box = new Rect();
      box.left = Math.min(startPos.x, e.clientX);
      box.right = Math.max(startPos.x, e.clientX);
      box.top = Math.min(startPos.y, e.clientY);
      box.bottom = Math.max(startPos.y, e.clientY);
      item.setBounds(box);
      
      // compute the stationaryCorner
      var stationaryCorner = '';
      
      if (startPos.y == box.top)
        stationaryCorner += 'top';
      else
        stationaryCorner += 'bottom';
        
      if (startPos.x == box.left)
        stationaryCorner += 'left';
      else
        stationaryCorner += 'right';
      
      dragOutInfo.snap(stationaryCorner, false, false); // null for ui, which we don't use anyway.

      box = item.getBounds();
      if (box.width > minMinSize && box.height > minMinSize
          && (box.width > minSize || box.height > minSize)) 
        item.setOpacity(1);
      else 
        item.setOpacity(0.7);
      
      e.preventDefault();     
    }
    
    function collapse(){
      phantom.animate({
        width: 0,
        height: 0,
        top: phantom.position().top + phantom.height()/2,
        left: phantom.position().left + phantom.width()/2
      }, {
        duration: 300,
        complete: function() {
          phantom.remove();
        }
      });
    }
    
    function finalize(e){
      iQ(window).unbind("mousemove", updateSize);
      dragOutInfo.stop();
      if ( phantom.css("opacity") != 1 ) 
        collapse();
      else {
        var bounds = item.getBounds();

        // Add all of the orphaned tabs that are contained inside the new group
        // to that group.
        var tabs = Groups.getOrphanedTabs();
        var insideTabs = [];
        for each( tab in tabs ){
          if ( bounds.contains( tab.bounds ) ){
            insideTabs.push(tab);
          }
        }
        
        var group = new Group(insideTabs,{bounds:bounds});
        phantom.remove();
        dragOutInfo = null;
      }
    }
    
    iQ(window).mousemove(updateSize)
    iQ(window).one('mouseup', finalize);
    e.preventDefault();  
    return false;
  },
  
  // ----------
  // Function: setActiveTab
  // Sets the currently active tab. The idea of a focused tab is useful
  // for keyboard navigation and returning to the last zoomed-in tab.
  // Hitting return/esc brings you to the focused tab, and using the
  // arrow keys lets you navigate between open tabs.
  //
  // Parameters:
  //  - Takes a <TabItem>
  //
  setActiveTab: function(tab){
    if(tab == this._activeTab)
      return;
      
    if(this._activeTab) { 
      this._activeTab.makeDeactive();
      this._activeTab.removeOnClose(this);
    }
      
    this._activeTab = tab;
    
    if(this._activeTab) {
      var self = this;
      this._activeTab.addOnClose(this, function() {
        self._activeTab = null;
      });

      this._activeTab.makeActive();
    }
  },
  
  // ----------
  // Function: getActiveTab
  // Returns the currently active tab as a <TabItem>
  //
  getActiveTab: function(){
    return this._activeTab;
  }
}

// ##########
// Class: UIClass
// Singleton top-level UI manager. TODO: Integrate with <Page>.
function UIClass(){ 
  if(window.Tabs)
    this.init();
  else {
    var self = this;
    TabsManager.addSubscriber(this, 'load', function() {
      self.init();
    });
  }
};

// ----------
UIClass.prototype = {
  // ----------
  init: function() {
    try {
      Utils.log('TabCandy init --------------------');

      // Variable: navBar
      // A reference to the <Navbar>, for manipulating the browser's nav bar. 
      this.navBar = Navbar;
      
      // Variable: tabBar
      // A reference to the <Tabbar>, for manipulating the browser's tab bar.
      this.tabBar = Tabbar;
      
      // Variable: devMode
      // If true (set by an url parameter), adds extra features to the screen. 
      // TODO: Integrate with the dev menu
      this.devMode = false;
      
      // Variable: currentTab
      // Keeps track of which <Tabs> tab we are currently on.
      // Used to facilitate zooming down from a previous tab. 
      this.currentTab = Utils.activeTab;
      
      var self = this;
      
      this.setBrowserKeyHandler();
      
      // ___ Dev Menu
      this.addDevMenu();

      iQ("#reset").click(function(){
        self.reset();
      });

      iQ("#feedback").click(function(){
        self.newTab('http://feedback.mozillalabs.com/forums/56804-tabcandy');
      });

      iQ(window).bind('beforeunload', function() {
        // Things may not all be set up by now, so check for everything
        if(self.showChrome)
          self.showChrome();  
          
        if(self.tabBar && self.tabBar.showAllTabs)
          self.tabBar.showAllTabs();
      });
      
      // ___ Page
      let currentWindow = Utils.getCurrentWindow();
      Page.init();
      
      currentWindow.addEventListener(
        "tabcandyshow", function() {
          Page.hideChrome();
          Page.showTabCandy();
        }, false);
        
      currentWindow.addEventListener(
        "tabcandyhide", function() { Page.showChrome(); }, false);
          
      // ___ delay init
      Storage.onReady(function() {
        self.delayInit();
      });
    }catch(e) {
      Utils.log("Error in UIClass(): " + e);
      Utils.log(e.fileName);
      Utils.log(e.lineNumber);
      Utils.log(e.stack);
    }
  },

  // ----------
  delayInit : function() {
    try {
      // ___ Storage
      let currentWindow = Utils.getCurrentWindow();
      let data = Storage.readUIData(currentWindow);
      this.storageSanity(data);
  
      let groupsData = Storage.readGroupsData(currentWindow);
      let firstTime = !groupsData || iQ.isEmptyObject(groupsData);
      let groupData = Storage.readGroupData(currentWindow);
      Groups.reconstitute(groupsData, groupData);
  
      TabItems.init();
  
      if(firstTime) {
        let items = TabItems.getItems();
        iQ.each(items, function(index, item) {
          if(item.parent)
            item.parent.remove(item);
        });
  
        let box = Items.getPageBounds();
        box.inset(10, 10);
        let options = {padding: 10};
        Items.arrange(items, box, options);
      } 
          
      // ___ resizing
      if(data.pageBounds) {
        this.pageBounds = data.pageBounds;
        this.resize(true);
      } else
        this.pageBounds = Items.getPageBounds();
  
      var self = this;
      iQ(window).resize(function() {
        self.resize();
      });
  
      // ___ Done
      this.initialized = true;
      this.save(); // for this.pageBounds
    } catch(e) {
      Utils.log(e);
    }
  },
  
  // ----------
  setBrowserKeyHandler : function() {
    var self = this;
    var browser = Utils.getCurrentWindow().gBrowser;
    var tabbox = browser.mTabBox;

    browser.addEventListener("keypress", function(event) {
      var handled = false;
      // based on http://mxr.mozilla.org/mozilla1.9.2/source/toolkit/content/widgets/tabbox.xml#145
      switch (event.keyCode) {
        case event.DOM_VK_TAB:
          if (event.ctrlKey && !event.altKey && !event.metaKey)
            if (tabbox.tabs && tabbox.handleCtrlTab) {
              self.advanceSelectedTab(event.shiftKey);
              event.stopPropagation();
              event.preventDefault();
              handled = true;
            }
          break;
        case event.DOM_VK_PAGE_UP:
          if (event.ctrlKey && !event.shiftKey && !event.altKey &&
              !event.metaKey)
            if (tabbox.tabs && tabbox.handleCtrlPageUpDown) {
              self.advanceSelectedTab(true);
              event.stopPropagation();
              event.preventDefault();
              handled = true;
            }
            break;
        case event.DOM_VK_PAGE_DOWN:
          if (event.ctrlKey && !event.shiftKey && !event.altKey &&
              !event.metaKey)
            if (tabbox.tabs && tabbox.handleCtrlPageUpDown) {
              self.advanceSelectedTab(false);
              event.stopPropagation();
              event.preventDefault();
              handled = true;
            }
            break;
        case event.DOM_VK_LEFT:
          if (event.metaKey && event.altKey && !event.shiftKey &&
              !event.ctrlKey)
            if (tabbox.tabs && tabbox._handleMetaAltArrows) {
              var reverse =
                window.getComputedStyle(tabbox, "").direction == "ltr" ? -1 : 1;
              self.advanceSelectedTab(reverse);
              event.stopPropagation();
              event.preventDefault();
              handled = true;
            }
            break;
        case event.DOM_VK_RIGHT:
          if (event.metaKey && event.altKey && !event.shiftKey &&
              !event.ctrlKey)
            if (tabbox.tabs && tabbox._handleMetaAltArrows) {
              var forward =
                window.getComputedStyle(tabbox, "").direction == "ltr" ? 1 : -1;
              self.advanceSelectedTab(!forward);
              event.stopPropagation();
              event.preventDefault();
              handled = true;
            }
            break;
      }
      
      if (!handled) {
        // ToDo: the "tabs" binding implements the nsIDOMXULSelectControlElement,
        // we might need to rewrite the tabs without using the
        // nsIDOMXULSelectControlElement.
        // http://mxr.mozilla.org/mozilla1.9.2/source/toolkit/content/widgets/tabbox.xml#246
        // The below handles the ctrl/meta + number key and prevent the default
        // actions.
        var isMac = (navigator.platform.search(/mac/i) > -1);
        
        if ((isMac && event.metaKey) || (!isMac && event.ctrlKey)) {
          var charCode = event.charCode;
          // 1 to 9
          if (48 < charCode && charCode < 58) {
            self.advanceSelectedTab(false, (charCode - 48));
            event.stopPropagation();
            event.preventDefault();
          }
        }
      }
    }, false);
  },
  
  // ----------
  advanceSelectedTab : function(reverse, index) {
    var tabbox = Utils.getCurrentWindow().gBrowser.mTabBox;
    var tabs = tabbox.tabs;
    var visibleTabs = [];
    var selectedIndex;
    
    for (var i = 0; i < tabs.childNodes.length ; i++) {
      var tab = tabs.childNodes[i];
      if (!tab.collapsed) {
        visibleTabs.push(tab);
        if (tabs.selectedItem == tab) {
          selectedIndex = (visibleTabs.length - 1);
        }
      }
    }
    
    // reverse should be false when index exists.
    if (index && index > 0) {
      if (visibleTabs.length > 1) {
        if (visibleTabs.length >= index && index < 9) {
          tabs.selectedItem = visibleTabs[index - 1];
        } else {
          tabs.selectedItem = visibleTabs[visibleTabs.length - 1];
        }
      } 
    } else {
      if (visibleTabs.length > 1) {
        if (reverse) {
          tabs.selectedItem =
            (selectedIndex == 0) ? visibleTabs[visibleTabs.length - 1] :
              visibleTabs[selectedIndex - 1]
        } else {
          tabs.selectedItem =
            (selectedIndex == (visibleTabs.length - 1)) ? visibleTabs[0] :
              visibleTabs[selectedIndex + 1];
        }
      } 
    }
  },

  // ----------
  resize: function(force) {
    if( typeof(force) == "undefined" ) force = false;

    // If we are currently doing an animation or if TabCandy isn't focused
    // don't perform a resize. This resize really slows things down.
    var isAnimating = iQ.isAnimating();
    if( force == false){
      if( isAnimating || !Page.isTabCandyVisible() ) {
        // TODO: should try again once the animation is done
        // Actually, looks like iQ.isAnimating is non-functional;
        // perhaps we should clean it out, or maybe we should fix it. 
        return;   
      }
    }   

    var oldPageBounds = new Rect(this.pageBounds);
    var newPageBounds = Items.getPageBounds();
    if (newPageBounds.equals(oldPageBounds))
      return;
        
    var items = Items.getTopLevelItems();
    
    // compute itemBounds: the union of all the top-level items' bounds.
    var itemBounds = new Rect(this.pageBounds); // We start with pageBounds so that we respect
                                                // the empty space the user has left on the page.
    itemBounds.width = 1;
    itemBounds.height = 1;
    iQ.each(items, function(index, item) {
      if(item.locked.bounds)
        return;
        
      var bounds = item.getBounds();
      itemBounds = (itemBounds ? itemBounds.union(bounds) : new Rect(bounds));
    });
      
    Groups.repositionNewTabGroup(); // TODO: 

    if (newPageBounds.width < this.pageBounds.width && newPageBounds.width > itemBounds.width)
      newPageBounds.width = this.pageBounds.width;

    if (newPageBounds.height < this.pageBounds.height && newPageBounds.height > itemBounds.height)
      newPageBounds.height = this.pageBounds.height;

    var wScale;
    var hScale;
    if ( Math.abs(newPageBounds.width - this.pageBounds.width)
         > Math.abs(newPageBounds.height - this.pageBounds.height) ) {
      wScale = newPageBounds.width / this.pageBounds.width;
      hScale = newPageBounds.height / itemBounds.height;
    } else {
      wScale = newPageBounds.width / itemBounds.width;
      hScale = newPageBounds.height / this.pageBounds.height;
    }
    
    var scale = Math.min(hScale, wScale);
    var self = this;
    var pairs = [];
    iQ.each(items, function(index, item) {
      if(item.locked.bounds)
        return;
        
      var bounds = item.getBounds();

      bounds.left += newPageBounds.left - self.pageBounds.left;
      bounds.left *= scale;
      bounds.width *= scale;

      bounds.top += newPageBounds.top - self.pageBounds.top;            
      bounds.top *= scale;
      bounds.height *= scale;
      
      pairs.push({
        item: item,
        bounds: bounds
      });
    });
    
    Items.unsquish(pairs);
    
    iQ.each(pairs, function(index, pair) {
      pair.item.setBounds(pair.bounds, true);
      pair.item.snap();
    });

    this.pageBounds = Items.getPageBounds();
    this.save();
  },
  
  // ----------
  addDevMenu: function() {
    try {
      var self = this;
      
      var $select = iQ('<select>')
        .css({
          position: 'absolute',
          top: 5,
          right: 5,
          opacity: .2
        })
        .appendTo('body')
        .change(function () {
          var index = iQ(this).val();
          try {
            commands[index].code.apply(commands[index].element);
          } catch(e) {
            Utils.log('dev menu error', e);
          }
          iQ(this).val(0);
        });
        
      var commands = [{
        name: 'dev menu', 
        code: function() {
        }
      }, {
        name: 'show trenches', 
        code: function() {
          Trenches.toggleShown();
          iQ(this).html((Trenches.showDebug ? 'hide' : 'show') + ' trenches');
        }
      }, {
        name: 'refresh', 
        code: function() {
          location.href = 'tabcandy.html';
        }
      }, {
        name: 'code docs', 
        code: function() {
          self.newTab('http://hg.mozilla.org/labs/tabcandy/raw-file/tip/content/doc/index.html');
        }
      }, {
        name: 'save', 
        code: function() {
          self.saveAll();
        }
      }, {
        name: 'group sites', 
        code: function() {
          self.arrangeBySite();
        }
      }];
        
      var count = commands.length;
      var a;
      for(a = 0; a < count; a++) {
        commands[a].element = iQ('<option>')
          .val(a)
          .html(commands[a].name)
          .appendTo($select)
          .get(0);
      }
    } catch(e) {
      Utils.log(e);
    }
  },

  // -----------
  reset: function() {
    Storage.wipe();
    location.href = '';      
  },
    
  // ----------
  saveAll: function() {  
    this.save();
    Groups.saveAll();
    TabItems.saveAll();
  },

  // ----------
  save: function() {  
    if(!this.initialized) 
      return;
      
    var data = {
      pageBounds: this.pageBounds
    };
    
    if(this.storageSanity(data))
      Storage.saveUIData(Utils.getCurrentWindow(), data);
  },

  // ----------
  storageSanity: function(data) {
    if(iQ.isEmptyObject(data))
      return true;
      
    if(!isRect(data.pageBounds)) {
      Utils.log('UI.storageSanity: bad pageBounds', data.pageBounds);
      data.pageBounds = null;
      return false;
    }
      
    return true;
  },
  
  // ----------
  arrangeBySite: function() {
    function putInGroup(set, key) {
      var group = Groups.getGroupWithTitle(key);
      if(group) {
        iQ.each(set, function(index, el) {
          group.add(el);
        });
      } else 
        new Group(set, {dontPush: true, dontArrange: true, title: key});      
    }

    Groups.removeAll();
    
    var newTabsGroup = Groups.getNewTabGroup();
    var groups = [];
    var items = TabItems.getItems();
    iQ.each(items, function(index, item) {
      var url = item.getURL(); 
      var domain = url.split('/')[2]; 
      if(!domain)
        newTabsGroup.add(item);
      else {
        var domainParts = domain.split('.');
        var mainDomain = domainParts[domainParts.length - 2];
        if(groups[mainDomain]) 
          groups[mainDomain].push(item.container);
        else 
          groups[mainDomain] = [item.container];
      }
    });
    
    var leftovers = [];
    for(key in groups) {
      var set = groups[key];
      if(set.length > 1) {
        putInGroup(set, key);
      } else
        leftovers.push(set[0]);
    }
    
    putInGroup(leftovers, 'mixed');
    
    Groups.arrange();
  }, 
  
  // ----------
  newTab: function(url) {
    try {
      var group = Groups.getNewTabGroup();
      if(group)
        group.newTab(url);
      else
        Tabs.open(url);
    } catch(e) {
      Utils.log(e);
    }
  }
};

// ----------
window.UI = new UIClass();

})();