/* 
  popup.js

  A lightweight general purpose JavaScript DOM element popup class.

  Webpage:
	http;//www.methods.co.nz/popup/popup.html

  Inspired by:
	Lightbox2: http://www.huddletogether.com/projects/lightbox2/
	Lightbox Gone Wild: http://particletree.com/features/lightbox-gone-wild/
	Tooltip: http://blog.innerewut.de/pages/tooltip
	Prototype library: http://www.prototypejs.org/
	Scriptaculous library: http://script.aculo.us/

  Attributions:
	- Uses the getPageSize() function from Lightbox v2.02 by Lokesh Dhakar
	  (http://www.huddletogether.com/projects/lightbox2/).
	- Adapted the the modal overlay technique used in Lightbox v2.02 by Lokesh
	  Dhakar (http://www.huddletogether.com/projects/lightbox2/).

  Version: 1.0.1

  Author:    Stuart Rackham <srackham@methods.co.nz>
  License:   This source code is released under the MIT license.

  Copyright (c) Stuart Rackham 2007

*/

var Popup = Class.create();
Popup.zIndex = 1000;  // z-index of first popup.

Popup.prototype = {

  /*
	Popup creation
  */
  initialize: function(popup, link) {
	var options = Object.extend({
	  modal: false,
	  effect: 'fade',
	  hidden: true,
	  closebox: 'popup_closebox',       // CSS class name of click-to-close elements.
	  draghandle: 'popup_draghandle'    // CSS class name of drag handle elements.
	}, arguments[2] || {});
	options.position = options.position || (options.modal ? 'center' : 'auto');
	options.trigger = options.trigger || (options.modal ? 'click' : 'mouseover');
	options.duration = this.first_value(options.duration, Popup.duration, 0.5);
	options.show_duration = this.first_value(options.show_duration, options.duration);
	options.hide_duration = this.first_value(options.hide_duration, options.duration);
	options.opacity = this.first_value(options.opacity, Popup.opacity, 0.5);
	options.show_delay = this.first_value(options.show_delay, Popup.show_delay, 500);
	options.hide_delay = this.first_value(options.hide_delay, Popup.hide_delay, 200);
	options.cursor_margin = this.first_value(options.cursor_margin, Popup.cursor_margin, 5);
	this.options = options;
	if (link) {
	  this.link = $(link);
	}
	this.popup = $(popup);
	this.popup.popup = this;  // Make the popup object a property of the DOM popup element.
	if (options.hidden) {
	  this.popup.hide();
	}
	if (options.closebox) {
	  this.closeboxes = document.getElementsByClassName(options.closebox, this.popup);
	  if (this.popup.hasClassName(options.closebox)) {
		this.closeboxes[this.closeboxes.length] = this.popup;
	  }
	}
	else {
	  this.closeboxes = [];
	}
	if (options.draghandle) {
	  var draghandles = document.getElementsByClassName(options.draghandle, this.popup);
	  for (i = 0; i < draghandles.length; i++) {
		new Draggable(this.popup, { handle: draghandles[i] });
	  }
	  if (this.popup.hasClassName(options.draghandle)) {
		new Draggable(this.popup, { handle: this.popup });
	  }
	}
	this.register_events();
  },


  /*
	Event functions
  */

  register_events: function() {
	var trigger_function;
	if (this.is_auto_open()) {
	  trigger_function = this.start_show_timer;
	  if (this.link) {
		Event.observe(this.link, 'mouseout', this.stop_show_timer.bindAsEventListener(this));
	  }
	}
	else {
	  trigger_function = this.show;
	}
	if (this.link) {
	  Event.observe(this.link, this.options.trigger, trigger_function.bindAsEventListener(this));
	}
	if (!this.options.modal) {
	  Event.observe(this.popup, 'click', this.bring_to_front.bindAsEventListener(this));
	}
	if (this.closeboxes.length > 0) {
	  for (var i = 0; i < this.closeboxes.length; i++) {
		Event.observe(this.closeboxes[i], 'click', this.hide.bindAsEventListener(this));
	  }
	}
	else {
	  if (this.link) {
		Event.observe(this.link, 'mouseout', this.start_hide_timer.bindAsEventListener(this));
	  }
	  Event.observe(this.popup, 'mouseover', this.stop_hide_timer.bindAsEventListener(this));
	  Event.observe(this.popup, 'mouseout', this.start_hide_timer.bindAsEventListener(this));
	}
  },

  bring_to_front: function(event) {
	// Bring to front if not already there.
	if (Number(this.popup.style.zIndex) < Popup.zIndex - 1) {
	  this.popup.style.zIndex = Popup.zIndex++;
	}
  },

  start_show_timer: function(event) {
	// NOTE: event is bound to this.show but it's state changes between being
	// bound here and arriving at this.show -- specifically, the mouse
	// coordinates are reset to zero). I've no idea why. Anyway, this is the
	// reason for passing the event mouse coordinates as properties of this.
	this.stop_show_timer(event);
	this.mouse_x = Event.pointerX(event);
	this.mouse_y = Event.pointerY(event);
	this.show_timer = setTimeout(this.show.bind(this, event), this.options.show_delay);
  },

  stop_show_timer: function(event) {
	if (this.show_timer) {
	  clearTimeout(this.show_timer);
	  this.show_timer = null;
	}
  },

  start_hide_timer: function(event) {
	this.stop_hide_timer(event);
	this.hide_timer = setTimeout(this.hide.bind(this, event), this.options.hide_delay);
  },

  stop_hide_timer: function(event) {
	if (this.hide_timer) {
	  clearTimeout(this.hide_timer);
	  this.hide_timer = null;
	}
  },

  show: function(event) {
	this.stop_show_timer(event);
	this.stop_hide_timer(event);
	if (this.is_open) {
	  return;
	}
	if (this.options.modal) {
	  this.show_overlay();
	}
	var pos;
	if (!event) {
	  // We only arrive here if this.show has been called externally.
	  pos = this.get_popup_position();
	}
	else if (this.is_auto_open()) {
	  // Because auto-open popups calls this.show indirectly via start_show_timer.
	  pos = this.get_popup_position(this.mouse_x, this.mouse_y);
	}
	else {
	  pos = this.get_popup_position(Event.pointerX(event), Event.pointerY(event));
	}
	Element.setStyle(this.popup, { top: pos.y, left: pos.x, zIndex: Popup.zIndex++ });
	this.is_open = true;
	switch (this.options.effect) {
	  case 'slide':
		Effect.SlideDown(this.popup, {duration: this.options.show_duration});
		break;
	  case 'grow':
		Effect.Grow(this.popup, {duration: this.options.show_duration});
		break;
	  case 'blind':
		Effect.BlindDown(this.popup, {duration: this.options.show_duration});
		break;
	  case 'fade':
	  default:
		Effect.Appear(this.popup, {duration: this.options.show_duration});
		break;
	}
  },

  hide: function(event){
	this.is_open = false;
	switch (this.options.effect) {
	  case 'slide':
		Effect.SlideUp(this.popup, {duration: this.options.hide_duration});
		break;
	  case 'grow':
		Effect.Shrink(this.popup, {duration: this.options.hide_duration});
		break;
	  case 'blind':
		Effect.BlindUp(this.popup, {duration: this.options.hide_duration});
		break;
	  case 'fade':
	  default:
		Effect.Fade(this.popup, {duration: this.options.hide_duration});
		break;
	}
	if (this.options.modal) {
	  this.hide_overlay();
	}
  },


  /*
	Helper functions
  */

  // Return the first function argument that is not undefined.
  // Because when zero numerical value are possible you can't use || chains.
  first_value: function() {
	for (var i = 0; i < arguments.length; i++) {
	  if (arguments[i] !== undefined) {
		return arguments[i];
	  }
	}
	return undefined;
  },

  is_auto_open: function() {
	return this.options.trigger == 'mouseover';
  },

  show_overlay: function() {
	if (!Popup.overlay) {
	  var overlay = document.createElement('div');
	  overlay.setAttribute('id','popup_overlay');
	  overlay.style.display = 'none';
	  document.body.appendChild(overlay);
	  Popup.overlay = overlay;
	  Popup.overlay_levels = [];
	}
	Popup.overlay.style.height = this.get_page_dimensions().height + 'px';
	var z = Popup.zIndex++;
	Popup.overlay.style.zIndex = z;
	Popup.overlay_levels.push(z);
	if ( Popup.overlay_levels.length == 1) { // Opening the first modal popup.
	  // Queue the global overlay effect to ensure correct execution order.
	  new Effect.Appear(Popup.overlay,
		{ duration: this.options.show_duration,
		  to: this.options.opacity,
		  queue: {position: 'end', scope: 'popup_overlay'}
		});
	}
	else { // There is another modal popup at a lower level so move the overlay forward.
	  Popup.overlay.style.zIndex = z;
	}
  },

  hide_overlay: function() {
	Popup.overlay_levels.pop();
	var z = Popup.overlay_levels.pop();
	if (z) { // There is another modal popup at a lower level so move the overlay back.
	  Popup.overlay_levels.push(z);
	  Popup.overlay.style.zIndex = z;
	}
	else { // The last modal popup is being closed so hide the overlay
	  // Queue the global overlay effect to ensure correct execution order.
	  new Effect.Fade(Popup.overlay,
		{ duration: this.options.hide_duration,
		  queue: {position: 'end', scope: 'popup_overlay'}
		});
	}
  },


  /*
	Positioning functions
  */

  // Return the top and left CSS position strings as an {x,y} object that the
  // popup should be shown at.  mouse_x and mouse_y are the mouse x,y coordinates
  // numbers when the popup was triggered.
  get_popup_position: function(mouse_x, mouse_y) {
	var pos;
	switch (this.options.position) {
	  case 'auto':
		pos = this.get_auto_position(mouse_x, mouse_y);
		break;
	  case 'center':
		pos = this.get_center_position();
		break;
	  case 'below':
		pos = this.get_below_position();
		break;
	  default:
		// Check for x,y postion format (x and y can be any valid CSS left or
		// top property value).
		if (mo = this.options.position.match(/^\s*([^\s,]+)\s*,\s*([^\s,]+)\s*$/)) {
		  pos = {x: mo[1], y: mo[2]};
		  // If possible convert to numbers.
		  pos.x = Number(pos.x) || pos.x;
		  pos.y = Number(pos.y) || pos.y;
		}
		else {
		  pos = {x: 0, y: 0};
		}
		break;
	}
	if (typeof pos.x == 'number') {
	  pos.x += 'px';
	}
	if (typeof pos.y == 'number') {
	  pos.y += 'px';
	}
	return pos;
  },

  get_below_position: function() {
	var pos = Position.cumulativeOffset(this.link);
	return {x: pos[0], y: pos[1] + Element.getHeight(this.link)};
  },

  get_center_position: function() {
	dim = Element.getDimensions(this.popup);
	var popup_width = dim.width;
	var popup_height = dim.height;
	dim = this.get_viewport_dimensions();
	var viewport_width = dim.width;
	var viewport_height = dim.height;

	var x;
	if (popup_width >= viewport_width) {
	  x = 0;
	}
	else {
	  x = (viewport_width - popup_width)/2;
	}

	var y;
	if (popup_height >= viewport_height) {
	  y = 0;
	}
	else {
	  y = (viewport_height - popup_height)/2;
	}

	return {x: x, y: y}; 
  },

  get_auto_position: function(mouse_x, mouse_y) {
	dim = Element.getDimensions(this.popup);
	var popup_width = dim.width;
	var popup_height = dim.height;
	dim = this.get_viewport_dimensions();
	var viewport_width = dim.width;
	var viewport_height = dim.height;

	var available_right = viewport_width - (mouse_x + this.options.cursor_margin);
	var available_left = mouse_x - this.options.cursor_margin;
	var available_top = mouse_y - this.options.cursor_margin;
	var available_bottom = viewport_height - (mouse_x + this.options.cursor_margin);
	var offset = this.options.cursor_margin;
	var x = mouse_x;
	var y = mouse_y;

	if (popup_width >= viewport_width) {
	  x = 0;
	}
	else if (popup_width <= available_right) {
	  x += offset;
	}
	else if (popup_width <= available_left) {
	  x -= popup_width + offset;
	}
	else if (available_right >= available_left) {
	  x = viewport_width - popup_width;
	}
	else {
	  x = 0;
	}

	if (popup_height >= viewport_height) {
	  y = 0;
	}
	else if (popup_height <= available_bottom) {
	  y += offset;
	}
	else if (popup_height <= available_top) {
	  y -= popup_height + offset;
	}
	else if (available_bottom >= available_top) {
	  y = viewport_height - popup_height;
	}
	else {
	  y = 0;
	}

	return {x: x, y: y}; 
  },

  get_viewport_dimensions: function() {
		var dim = this.getPageSize();
	return {width: dim[2], height: dim[3]};
  },

  get_page_dimensions: function() {
		var dim = this.getPageSize();
	return {width: dim[0], height: dim[1]};
  },

  // This function from Lightbox v2.02 by Lokesh Dhakar
  // (http://www.huddletogether.com/projects/lightbox2/).
  //
  // Returns array with page width, height and window width, height
  // Core code from - quirksmode.org
  // Edit for Firefox by pHaez
  //
  getPageSize: function() {
	var xScroll, yScroll;

	if (window.innerHeight && window.scrollMaxY) {	
	  xScroll = document.body.scrollWidth;
	  yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
	  xScroll = document.body.scrollWidth;
	  yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
	  xScroll = document.body.offsetWidth;
	  yScroll = document.body.offsetHeight;
	}

	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
	  windowWidth = self.innerWidth;
	  windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
	  windowWidth = document.documentElement.clientWidth;
	  windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
	  windowWidth = document.body.clientWidth;
	  windowHeight = document.body.clientHeight;
	}	

	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
	  pageHeight = windowHeight;
	} else { 
	  pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
	  pageWidth = windowWidth;
	} else {
	  pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
	return arrayPageSize;
  }

}