// SpryTabbedPanels.js - version 0.7 - 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.
(function() { // BeginSpryComponent
  if (typeof Spry == "undefined") window.Spry = {};
  if (!Spry.Widget) Spry.Widget = {};

  Spry.Widget.TabbedPanels = function(element, opts) {
    this.element = this.getElement(element);
    this.defaultTab = 0; // Show the first panel by default.
    this.tabSelectedClass = "TabbedPanelsTabSelected";
    this.tabHoverClass = "TabbedPanelsTabHover";
    this.tabFocusedClass = "TabbedPanelsTabFocused";
    this.panelVisibleClass = "TabbedPanelsContentVisible";
    this.focusElement = null;
    this.hasFocus = false;
    this.currentTabIndex = 0;
    this.enableKeyboardNavigation = true;
    this.nextPanelKeyCode = Spry.Widget.TabbedPanels.KEY_RIGHT;
    this.previousPanelKeyCode = Spry.Widget.TabbedPanels.KEY_LEFT;

    Spry.Widget.TabbedPanels.setOptions(this, opts);

    // If the defaultTab is expressed as a number/index, convert
    // it to an element.
    if (typeof(this.defaultTab) == "number") {
      if (this.defaultTab < 0) this.defaultTab = 0;
      else {
        var count = this.getTabbedPanelCount();
        if (this.defaultTab >= count) this.defaultTab = (count > 1) ? (count - 1) : 0;
      }

      this.defaultTab = this.getTabs()[this.defaultTab];
    }

    // The defaultTab property is supposed to be the tab element for the tab content
    // to show by default. The caller is allowed to pass in the element itself or the
    // element's id, so we need to convert the current value to an element if necessary.
    if (this.defaultTab) this.defaultTab = this.getElement(this.defaultTab);

    this.attachBehaviors();
  };

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

  Spry.Widget.TabbedPanels.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.TabbedPanels.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.TabbedPanels.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.TabbedPanels.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.TabbedPanels.prototype.getTabGroup = function() {
    if (this.element) {
      var children = this.getElementChildren(this.element);
      if (children.length) return children[0];
    }
    return null;
  };

  Spry.Widget.TabbedPanels.prototype.getTabs = function() {
    var tabs = [];
    var tg = this.getTabGroup();
    if (tg) tabs = this.getElementChildren(tg);
    return tabs;
  };

  Spry.Widget.TabbedPanels.prototype.getContentPanelGroup = function() {
    if (this.element) {
      var children = this.getElementChildren(this.element);
      if (children.length > 1) return children[1];
    }
    return null;
  };

  Spry.Widget.TabbedPanels.prototype.getContentPanels = function() {
    var panels = [];
    var pg = this.getContentPanelGroup();
    if (pg) panels = this.getElementChildren(pg);
    return panels;
  };

  Spry.Widget.TabbedPanels.prototype.getIndex = function(ele, arr) {
    ele = this.getElement(ele);
    if (ele && arr && arr.length) {
      for (var i = 0; i < arr.length; i++) {
        if (ele == arr[i]) return i;
      }
    }
    return -1;
  };

  Spry.Widget.TabbedPanels.prototype.getTabIndex = function(ele) {
    var i = this.getIndex(ele, this.getTabs());
    if (i < 0) i = this.getIndex(ele, this.getContentPanels());
    return i;
  };

  Spry.Widget.TabbedPanels.prototype.getCurrentTabIndex = function() {
    return this.currentTabIndex;
  };

  Spry.Widget.TabbedPanels.prototype.getTabbedPanelCount = function(ele) {
    return Math.min(this.getTabs().length, this.getContentPanels().length);
  };

  Spry.Widget.TabbedPanels.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.TabbedPanels.prototype.cancelEvent = function(e) {
    if (e.preventDefault) e.preventDefault();
    else e.returnValue = false;
    if (e.stopPropagation) e.stopPropagation();
    else e.cancelBubble = true;

    return false;
  };

  Spry.Widget.TabbedPanels.prototype.onTabClick = function(e, tab) {
    this.showPanel(tab);
    return this.cancelEvent(e);
  };

  Spry.Widget.TabbedPanels.prototype.onTabMouseOver = function(e, tab) {
    this.addClassName(tab, this.tabHoverClass);
    return false;
  };

  Spry.Widget.TabbedPanels.prototype.onTabMouseOut = function(e, tab) {
    this.removeClassName(tab, this.tabHoverClass);
    return false;
  };

  Spry.Widget.TabbedPanels.prototype.onTabFocus = function(e, tab) {
    this.hasFocus = true;
    this.addClassName(tab, this.tabFocusedClass);
    return false;
  };

  Spry.Widget.TabbedPanels.prototype.onTabBlur = function(e, tab) {
    this.hasFocus = false;
    this.removeClassName(tab, this.tabFocusedClass);
    return false;
  };

  Spry.Widget.TabbedPanels.KEY_UP = 38;
  Spry.Widget.TabbedPanels.KEY_DOWN = 40;
  Spry.Widget.TabbedPanels.KEY_LEFT = 37;
  Spry.Widget.TabbedPanels.KEY_RIGHT = 39;


  Spry.Widget.TabbedPanels.prototype.onTabKeyDown = function(e, tab) {
    var key = e.keyCode;
    if (!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode)) return true;

    var tabs = this.getTabs();
    for (var i = 0; i < tabs.length; i++)
    if (tabs[i] == tab) {
      var el = false;
      if (key == this.previousPanelKeyCode && i > 0) el = tabs[i - 1];
      else if (key == this.nextPanelKeyCode && i < tabs.length - 1) el = tabs[i + 1];

      if (el) {
        this.showPanel(el);
        el.focus();
        break;
      }
    }

    return this.cancelEvent(e);
  };

  Spry.Widget.TabbedPanels.prototype.preorderTraversal = function(root, func) {
    var stopTraversal = false;
    if (root) {
      stopTraversal = func(root);
      if (root.hasChildNodes()) {
        var child = root.firstChild;
        while (!stopTraversal && child) {
          stopTraversal = this.preorderTraversal(child, func);
          try {
            child = child.nextSibling;
          } catch (e) {
            child = null;
          }
        }
      }
    }
    return stopTraversal;
  };

  Spry.Widget.TabbedPanels.prototype.addPanelEventListeners = function(tab, panel) {
    var self = this;
    Spry.Widget.TabbedPanels.addEventListener(tab, "click", function(e) {
      return self.onTabClick(e, tab);
    }, false);
    Spry.Widget.TabbedPanels.addEventListener(tab, "mouseover", function(e) {
      return self.onTabMouseOver(e, tab);
    }, false);
    Spry.Widget.TabbedPanels.addEventListener(tab, "mouseout", function(e) {
      return self.onTabMouseOut(e, tab);
    }, false);

    if (this.enableKeyboardNavigation) {
      // XXX: IE doesn't allow the setting of tabindex dynamically. This means we can't
      // rely on adding the tabindex attribute if it is missing to enable keyboard navigation
      // by default.
      // Find the first element within the tab container that has a tabindex or the first
      // anchor tag.
      var tabIndexEle = null;
      var tabAnchorEle = null;

      this.preorderTraversal(tab, function(node) {
        if (node.nodeType == 1 /* NODE.ELEMENT_NODE */ ) {
          var tabIndexAttr = tab.attributes.getNamedItem("tabindex");
          if (tabIndexAttr) {
            tabIndexEle = node;
            return true;
          }
          if (!tabAnchorEle && node.nodeName.toLowerCase() == "a") tabAnchorEle = node;
        }
        return false;
      });

      if (tabIndexEle) this.focusElement = tabIndexEle;
      else if (tabAnchorEle) this.focusElement = tabAnchorEle;

      if (this.focusElement) {
        Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "focus", function(e) {
          return self.onTabFocus(e, tab);
        }, false);
        Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "blur", function(e) {
          return self.onTabBlur(e, tab);
        }, false);
        Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "keydown", function(e) {
          return self.onTabKeyDown(e, tab);
        }, false);
      }
    }
  };

  Spry.Widget.TabbedPanels.prototype.showPanel = function(elementOrIndex) {
    var tpIndex = -1;

    if (typeof elementOrIndex == "number") tpIndex = elementOrIndex;
    else // Must be the element for the tab or content panel.
    tpIndex = this.getTabIndex(elementOrIndex);

    if (!tpIndex < 0 || tpIndex >= this.getTabbedPanelCount()) return;

    var tabs = this.getTabs();
    var panels = this.getContentPanels();

    var numTabbedPanels = Math.max(tabs.length, panels.length);

    for (var i = 0; i < numTabbedPanels; i++) {
      if (i != tpIndex) {
        if (tabs[i]) this.removeClassName(tabs[i], this.tabSelectedClass);
        if (panels[i]) {
          this.removeClassName(panels[i], this.panelVisibleClass);
          panels[i].style.display = "none";
        }
      }
    }

    this.addClassName(tabs[tpIndex], this.tabSelectedClass);
    this.addClassName(panels[tpIndex], this.panelVisibleClass);
    panels[tpIndex].style.display = "block";

    this.currentTabIndex = tpIndex;
  };

  Spry.Widget.TabbedPanels.prototype.attachBehaviors = function(element) {
    var tabs = this.getTabs();
    var panels = this.getContentPanels();
    var panelCount = this.getTabbedPanelCount();

    for (var i = 0; i < panelCount; i++)
    this.addPanelEventListeners(tabs[i], panels[i]);

    this.showPanel(this.defaultTab);
  };

})(); // EndSpryComponent