// SpryAccordion.js - version 0.15 - Spry Pre-Release 1.6.1
//
// Copyright (c) 2006. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

var Spry;
if (!Spry) Spry = {};
if (!Spry.Widget) Spry.Widget = {};

Spry.Widget.Accordion = function(element, opts)
{
  this.element = this.getElement(element);
  this.defaultPanel = 0;
  this.hoverClass = "AccordionPanelTabHover";
  this.openClass = "AccordionPanelOpen";
  this.closedClass = "AccordionPanelClosed";
  this.focusedClass = "AccordionFocused";
  this.enableAnimation = true;
  this.enableKeyboardNavigation = true;
  this.currentPanel = null;
  this.animator = null;
  this.hasFocus = null;

  this.previousPanelKeyCode = Spry.Widget.Accordion.KEY_UP;
  this.nextPanelKeyCode = Spry.Widget.Accordion.KEY_DOWN;

  this.useFixedPanelHeights = false;
  this.fixedPanelHeight = 0;

  Spry.Widget.Accordion.setOptions(this, opts, true);

  this.attachBehaviors();
};

Spry.Widget.Accordion.prototype.getElement = function(ele)
{
  if (ele && typeof ele == "string")
    return document.getElementById(ele);
  return ele;
};

Spry.Widget.Accordion.prototype.addClassName = function(ele, className)
{
  if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) != -1))
    return;
  ele.className += (ele.className ? " " : "") + className;
};

Spry.Widget.Accordion.prototype.removeClassName = function(ele, className)
{
  if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) == -1))
    return;
  ele.className = ele.className.replace(new RegExp("\\s*\\b" + className + "\\b", "g"), "");
};

Spry.Widget.Accordion.setOptions = function(obj, optionsObj, ignoreUndefinedProps)
{
  if (!optionsObj)
    return;
  for (var optionName in optionsObj)
  {
    if (ignoreUndefinedProps && optionsObj[optionName] == undefined)
      continue;
    obj[optionName] = optionsObj[optionName];
  }
};

Spry.Widget.Accordion.prototype.onPanelTabMouseOver = function(e, panel)
{
  if (panel)
    this.addClassName(this.getPanelTab(panel), this.hoverClass);
  return false;
};

Spry.Widget.Accordion.prototype.onPanelTabMouseOut = function(e, panel)
{
  if (panel)
    this.removeClassName(this.getPanelTab(panel), this.hoverClass);
  return false;
};

Spry.Widget.Accordion.prototype.openPanel = function(elementOrIndex)
{
  var panelA = this.currentPanel;
  var panelB;

  if (typeof elementOrIndex == "number")
    panelB = this.getPanels()[elementOrIndex];
  else
    panelB = this.getElement(elementOrIndex);
  
  if (!panelB || panelA == panelB)  
    return null;

  var contentA = panelA ? this.getPanelContent(panelA) : null;
  var contentB = this.getPanelContent(panelB);

  if (!contentB)
    return null;

  if (this.useFixedPanelHeights && !this.fixedPanelHeight)
    this.fixedPanelHeight = (contentA.offsetHeight) ? contentA.offsetHeight : contentA.scrollHeight;

  if (this.enableAnimation)
  {
    if (this.animator)
      this.animator.stop();
    this.animator = new Spry.Widget.Accordion.PanelAnimator(this, panelB, { duration: this.duration, fps: this.fps, transition: this.transition });
    this.animator.start();
  }
  else
  {
    if(contentA)
    {
      contentA.style.display = "none";
      contentA.style.height = "0px";
    }
    contentB.style.display = "block";
    contentB.style.height = this.useFixedPanelHeights ? this.fixedPanelHeight + "px" : "auto";
  }

  if(panelA)
  {
    this.removeClassName(panelA, this.openClass);
    this.addClassName(panelA, this.closedClass);
  }

  this.removeClassName(panelB, this.closedClass);
  this.addClassName(panelB, this.openClass);

  this.currentPanel = panelB;

  return panelB;
};

Spry.Widget.Accordion.prototype.closePanel = function()
{
  // The accordion can only ever have one panel open at any
  // give time, so this method only closes the current panel.
  // If the accordion is in fixed panel heights mode, this
  // method does nothing.

  if (!this.useFixedPanelHeights && this.currentPanel)
  {
    var panel = this.currentPanel;
    var content = this.getPanelContent(panel);
    if (content)
    {
      if (this.enableAnimation)
      {
        if (this.animator)
          this.animator.stop();
        this.animator = new Spry.Widget.Accordion.PanelAnimator(this, null, { duration: this.duration, fps: this.fps, transition: this.transition });
        this.animator.start();
      }
      else
      {
        content.style.display = "none";
        content.style.height = "0px";
      }
    }    
    this.removeClassName(panel, this.openClass);
    this.addClassName(panel, this.closedClass);
    this.currentPanel = null;
  }
};

Spry.Widget.Accordion.prototype.openNextPanel = function()
{
  return this.openPanel(this.getCurrentPanelIndex() + 1);
};

Spry.Widget.Accordion.prototype.openPreviousPanel = function()
{
  return this.openPanel(this.getCurrentPanelIndex() - 1);
};

Spry.Widget.Accordion.prototype.openFirstPanel = function()
{
  return this.openPanel(0);
};

Spry.Widget.Accordion.prototype.openLastPanel = function()
{
  var panels = this.getPanels();
  return this.openPanel(panels[panels.length - 1]);
};

Spry.Widget.Accordion.prototype.onPanelTabClick = function(e, panel)
{
  if (panel != this.currentPanel)
    this.openPanel(panel);
  else
    this.closePanel();

  if (this.enableKeyboardNavigation)
    this.focus();

  if (e.preventDefault) e.preventDefault();
  else e.returnValue = false;
  if (e.stopPropagation) e.stopPropagation();
  else e.cancelBubble = true;

  return false;
};

Spry.Widget.Accordion.prototype.onFocus = function(e)
{
  this.hasFocus = true;
  this.addClassName(this.element, this.focusedClass);
  return false;
};

Spry.Widget.Accordion.prototype.onBlur = function(e)
{
  this.hasFocus = false;
  this.removeClassName(this.element, this.focusedClass);
  return false;
};

Spry.Widget.Accordion.KEY_UP = 38;
Spry.Widget.Accordion.KEY_DOWN = 40;

Spry.Widget.Accordion.prototype.onKeyDown = function(e)
{
  var key = e.keyCode;
  if (!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode))
    return true;
  
  var panels = this.getPanels();
  if (!panels || panels.length < 1)
    return false;
  var currentPanel = this.currentPanel ? this.currentPanel : panels[0];
  var nextPanel = (key == this.nextPanelKeyCode) ? currentPanel.nextSibling : currentPanel.previousSibling;

  while (nextPanel)
  {
    if (nextPanel.nodeType == 1 /* Node.ELEMENT_NODE */)
      break;
    nextPanel = (key == this.nextPanelKeyCode) ? nextPanel.nextSibling : nextPanel.previousSibling;
  }

  if (nextPanel && currentPanel != nextPanel)
    this.openPanel(nextPanel);

  if (e.preventDefault) e.preventDefault();
  else e.returnValue = false;
  if (e.stopPropagation) e.stopPropagation();
  else e.cancelBubble = true;

  return false;
};

Spry.Widget.Accordion.prototype.attachPanelHandlers = function(panel)
{
  if (!panel)
    return;

  var tab = this.getPanelTab(panel);

  if (tab)
  {
    var self = this;
    Spry.Widget.Accordion.addEventListener(tab, "click", function(e) { return self.onPanelTabClick(e, panel); }, false);
    Spry.Widget.Accordion.addEventListener(tab, "mouseover", function(e) { return self.onPanelTabMouseOver(e, panel); }, false);
    Spry.Widget.Accordion.addEventListener(tab, "mouseout", function(e) { return self.onPanelTabMouseOut(e, panel); }, false);
  }
};

Spry.Widget.Accordion.addEventListener = function(element, eventType, handler, capture)
{
  try
  {
    if (element.addEventListener)
      element.addEventListener(eventType, handler, capture);
    else if (element.attachEvent)
      element.attachEvent("on" + eventType, handler);
  }
  catch (e) {}
};

Spry.Widget.Accordion.prototype.initPanel = function(panel, isDefault)
{
  var content = this.getPanelContent(panel);
  if (isDefault)
  {
    this.currentPanel = panel;
    this.removeClassName(panel, this.closedClass);
    this.addClassName(panel, this.openClass);

    // Attempt to set up the height of the default panel. We don't want to
    // do any dynamic panel height calculations here because our accordion
    // or one of its parent containers may be display:none.

    if (content)
    {
      if (this.useFixedPanelHeights)
      {
        // We are in fixed panel height mode and the user passed in
        // a panel height for us to use.
  
        if (this.fixedPanelHeight)
          content.style.height = this.fixedPanelHeight + "px";
      }
      else
      {
        // We are in variable panel height mode, but since we can't
        // calculate the panel height here, we just set the height to
        // auto so that it expands to show all of its content.
  
        content.style.height = "auto";
      }
    }
  }
  else
  {
    this.removeClassName(panel, this.openClass);
    this.addClassName(panel, this.closedClass);

    if (content)
    {
      content.style.height = "0px";
      content.style.display = "none";
    }
  }
  
  this.attachPanelHandlers(panel);
};

Spry.Widget.Accordion.prototype.attachBehaviors = function()
{
  var panels = this.getPanels();
  for (var i = 0; i < panels.length; i++)
    this.initPanel(panels[i], i == this.defaultPanel);

  // Advanced keyboard navigation requires the tabindex attribute
  // on the top-level element.

  this.enableKeyboardNavigation = (this.enableKeyboardNavigation && this.element.attributes.getNamedItem("tabindex"));
  if (this.enableKeyboardNavigation)
  {
    var self = this;
    Spry.Widget.Accordion.addEventListener(this.element, "focus", function(e) { return self.onFocus(e); }, false);
    Spry.Widget.Accordion.addEventListener(this.element, "blur", function(e) { return self.onBlur(e); }, false);
    Spry.Widget.Accordion.addEventListener(this.element, "keydown", function(e) { return self.onKeyDown(e); }, false);
  }
};

Spry.Widget.Accordion.prototype.getPanels = function()
{
  return this.getElementChildren(this.element);
};

Spry.Widget.Accordion.prototype.getCurrentPanel = function()
{
  return this.currentPanel;
};

Spry.Widget.Accordion.prototype.getPanelIndex = function(panel)
{
  var panels = this.getPanels();
  for( var i = 0 ; i < panels.length; i++ )
  {
    if( panel == panels[i] )
      return i;
  }
  return -1;
};

Spry.Widget.Accordion.prototype.getCurrentPanelIndex = function()
{
  return this.getPanelIndex(this.currentPanel);
};

Spry.Widget.Accordion.prototype.getPanelTab = function(panel)
{
  if (!panel)
    return null;
  return this.getElementChildren(panel)[0];
};

Spry.Widget.Accordion.prototype.getPanelContent = function(panel)
{
  if (!panel)
    return null;
  return this.getElementChildren(panel)[1];
};

Spry.Widget.Accordion.prototype.getElementChildren = function(element)
{
  var children = [];
  var child = element.firstChild;
  while (child)
  {
    if (child.nodeType == 1 /* Node.ELEMENT_NODE */)
      children.push(child);
    child = child.nextSibling;
  }
  return children;
};

Spry.Widget.Accordion.prototype.focus = function()
{
  if (this.element && this.element.focus)
    this.element.focus();
};

Spry.Widget.Accordion.prototype.blur = function()
{
  if (this.element && this.element.blur)
    this.element.blur();
};

/////////////////////////////////////////////////////

Spry.Widget.Accordion.PanelAnimator = function(accordion, panel, opts)
{
  this.timer = null;
  this.interval = 0;

  this.fps = 60;
  this.duration = 500;
  this.startTime = 0;

  this.transition = Spry.Widget.Accordion.PanelAnimator.defaultTransition;

  this.onComplete = null;

  this.panel = panel;
  this.panelToOpen = accordion.getElement(panel);
  this.panelData = [];
  this.useFixedPanelHeights = accordion.useFixedPanelHeights;

  Spry.Widget.Accordion.setOptions(this, opts, true);

  this.interval = Math.floor(1000 / this.fps);

  // Set up the array of panels we want to animate.

  var panels = accordion.getPanels();
  for (var i = 0; i < panels.length; i++)
  {
    var p = panels[i];
    var c = accordion.getPanelContent(p);
    if (c)
    {
      var h = c.offsetHeight;
      if (h == undefined)
        h = 0;

      if (p == panel && h == 0)
        c.style.display = "block";

      if (p == panel || h > 0)
      {
        var obj = new Object;
        obj.panel = p;
        obj.content = c;
        obj.fromHeight = h;
        obj.toHeight = (p == panel) ? (accordion.useFixedPanelHeights ? accordion.fixedPanelHeight : c.scrollHeight) : 0;
        obj.distance = obj.toHeight - obj.fromHeight;
        obj.overflow = c.style.overflow;
        this.panelData.push(obj);

        c.style.overflow = "hidden";
        c.style.height = h + "px";
      }
    }
  }
};

Spry.Widget.Accordion.PanelAnimator.defaultTransition = function(time, begin, finish, duration) { time /= duration; return begin + ((2 - time) * time * finish); };

Spry.Widget.Accordion.PanelAnimator.prototype.start = function()
{
  var self = this;
  this.startTime = (new Date).getTime();
  this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};

Spry.Widget.Accordion.PanelAnimator.prototype.stop = function()
{
  if (this.timer)
  {
    clearTimeout(this.timer);

    // If we're killing the timer, restore the overflow
    // properties on the panels we were animating!

    for (i = 0; i < this.panelData.length; i++)
    {
      obj = this.panelData[i];
      obj.content.style.overflow = obj.overflow;
    }
  }

  this.timer = null;
};

Spry.Widget.Accordion.PanelAnimator.prototype.stepAnimation = function()
{
  var curTime = (new Date).getTime();
  var elapsedTime = curTime - this.startTime;

  var i, obj;

  if (elapsedTime >= this.duration)
  {
    for (i = 0; i < this.panelData.length; i++)
    {
      obj = this.panelData[i];
      if (obj.panel != this.panel)
      {
        obj.content.style.display = "none";
        obj.content.style.height = "0px";
      }
      obj.content.style.overflow = obj.overflow;
      obj.content.style.height = (this.useFixedPanelHeights || obj.toHeight == 0) ? obj.toHeight + "px" : "auto";
    }
    if (this.onComplete)
      this.onComplete();
    return;
  }

  for (i = 0; i < this.panelData.length; i++)
  {
    obj = this.panelData[i];
    var ht = this.transition(elapsedTime, obj.fromHeight, obj.distance, this.duration);
    obj.content.style.height = ((ht < 0) ? 0 : ht) + "px";
  }
  
  var self = this;
  this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};