/**
* @name InfoBox
* @version 1.1.9 [October 2, 2011]
* @author Gary Little (inspired by proof-of-concept code from Pamela Fox of Google)
* @copyright Copyright 2010 Gary Little [gary at luxcentral.com]
* @fileoverview InfoBox extends the Google Maps JavaScript API V3 <tt>OverlayView</tt> class.
*  <p>
*  An InfoBox behaves like a <tt>google.maps.InfoWindow</tt>, but it supports several
*  additional properties for advanced styling. An InfoBox can also be used as a map label.
*  <p>
*  An InfoBox also fires the same events as a <tt>google.maps.InfoWindow</tt>.
*  <p>
*  Browsers tested:
*  <p>
*  Mac -- Safari (4.0.4), Firefox (3.6), Opera (10.10), Chrome (4.0.249.43), OmniWeb (5.10.1)
*  <br>
*  Win -- Safari, Firefox, Opera, Chrome (3.0.195.38), Internet Explorer (8.0.6001.18702)
*  <br>
*  iPod Touch/iPhone -- Safari (3.1.2)
*/

/*!
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/*jslint browser:true */
/*global google */

/**
* @name InfoBoxOptions
* @class This class represents the optional parameter passed to the {@link InfoBox} constructor.
* @property {string|Node} content The content of the InfoBox (plain text or an HTML DOM node).
* @property {boolean} disableAutoPan Disable auto-pan on <tt>open</tt> (default is <tt>false</tt>).
* @property {number} maxWidth The maximum width (in pixels) of the InfoBox. Set to 0 if no maximum.
* @property {Size} pixelOffset The offset (in pixels) from the top left corner of the InfoBox
*  (or the bottom left corner if the <code>alignBottom</code> property is <code>true</code>)
*  to the map pixel corresponding to <tt>position</tt>.
* @property {LatLng} position The geographic location at which to display the InfoBox.
* @property {number} zIndex The CSS z-index style value for the InfoBox.
*  Note: This value overrides a zIndex setting specified in the <tt>boxStyle</tt> property.
* @property {string} boxClass The name of the CSS class defining the styles for the InfoBox container.
*  The default name is <code>infoBox</code>.
* @property {Object} [boxStyle] An object literal whose properties define specific CSS
*  style values to be applied to the InfoBox. Style values defined here override those that may
*  be defined in the <code>boxClass</code> style sheet. If this property is changed after the
*  InfoBox has been created, all previously set styles (except those defined in the style sheet)
*  are removed from the InfoBox before the new style values are applied.
* @property {string} closeBoxMargin The CSS margin style value for the close box.
*  The default is "2px" (a 2-pixel margin on all sides).
* @property {string} closeBoxURL The URL of the image representing the close box.
*  Note: The default is the URL for Google's standard close box.
*  Set this property to "" if no close box is required.
* @property {Size} infoBoxClearance Minimum offset (in pixels) from the InfoBox to the
*  map edge after an auto-pan.
* @property {boolean} isHidden Hide the InfoBox on <tt>open</tt> (default is <tt>false</tt>).
* @property {boolean} alignBottom Align the bottom left corner of the InfoBox to the <code>position</code>
*  location (default is <tt>false</tt> which means that the top left corner of the InfoBox is aligned).
* @property {string} pane The pane where the InfoBox is to appear (default is "floatPane").
*  Set the pane to "mapPane" if the InfoBox is being used as a map label.
*  Valid pane names are the property names for the <tt>google.maps.MapPanes</tt> object.
* @property {boolean} enableEventPropagation Propagate mousedown, click, dblclick,
*  and contextmenu events in the InfoBox (default is <tt>false</tt> to mimic the behavior
*  of a <tt>google.maps.InfoWindow</tt>). Set this property to <tt>true</tt> if the InfoBox
*  is being used as a map label. iPhone note: This property setting has no effect; events are
*  always propagated.
*/

/**
* Creates an InfoBox with the options specified in {@link InfoBoxOptions}.
*  Call <tt>InfoBox.open</tt> to add the box to the map.
* @constructor
* @param {InfoBoxOptions} [opt_opts]
*/
function InfoBox(opt_opts) {

	opt_opts = opt_opts || {};

	google.maps.OverlayView.apply(this, arguments);

	// Standard options (in common with google.maps.InfoWindow):
	//
	this.content_ = opt_opts.content || "";
	this.disableAutoPan_ = opt_opts.disableAutoPan || false;
	this.maxWidth_ = opt_opts.maxWidth || 0;
	this.pixelOffset_ = opt_opts.pixelOffset || new google.maps.Size(0, 0);
	this.position_ = opt_opts.position || new google.maps.LatLng(0, 0);
	this.zIndex_ = opt_opts.zIndex || null;

	// Additional options (unique to InfoBox):
	//
	this.boxClass_ = opt_opts.boxClass || "infoBox";
	this.boxStyle_ = opt_opts.boxStyle || {};
	this.closeBoxMargin_ = opt_opts.closeBoxMargin || "2px";
	this.closeBoxURL_ = opt_opts.closeBoxURL || "http://www.google.com/intl/en_us/mapfiles/close.gif";
	if (opt_opts.closeBoxURL === "") {
		this.closeBoxURL_ = "";
	}
	this.infoBoxClearance_ = opt_opts.infoBoxClearance || new google.maps.Size(1, 1);
	this.isHidden_ = opt_opts.isHidden || false;
	this.alignBottom_ = opt_opts.alignBottom || false;
	this.pane_ = opt_opts.pane || "floatPane";
	this.enableEventPropagation_ = opt_opts.enableEventPropagation || false;

	this.div_ = null;
	this.closeListener_ = null;
	this.eventListener1_ = null;
	this.eventListener2_ = null;
	this.eventListener3_ = null;
	this.moveListener_ = null;
	this.contextListener_ = null;
	this.fixedWidthSet_ = null;
}

/* InfoBox extends OverlayView in the Google Maps API v3.
*/
InfoBox.prototype = new google.maps.OverlayView();

/**
* Creates the DIV representing the InfoBox.
* @private
*/
InfoBox.prototype.createInfoBoxDiv_ = function() {

	var bw;
	var me = this;

	// This handler prevents an event in the InfoBox from being passed on to the map.
	//
	var cancelHandler = function(e) {
		e.cancelBubble = true;

		if (e.stopPropagation) {

			e.stopPropagation();
		}
	};

	// This handler ignores the current event in the InfoBox and conditionally prevents
	// the event from being passed on to the map. It is used for the contextmenu event.
	//
	var ignoreHandler = function(e) {

		e.returnValue = false;

		if (e.preventDefault) {

			e.preventDefault();
		}

		if (!me.enableEventPropagation_) {

			cancelHandler(e);
		}
	};

	if (!this.div_) {

		this.div_ = document.createElement("div");

		this.setBoxStyle_();

		if (typeof this.content_.nodeType === "undefined") {
			this.div_.innerHTML = this.getCloseBoxImg_() + this.content_;
		} else {
			this.div_.innerHTML = this.getCloseBoxImg_();
			this.div_.appendChild(this.content_);
		}

		// Add the InfoBox DIV to the DOM
		this.getPanes()[this.pane_].appendChild(this.div_);

		this.addClickHandler_();

		if (this.div_.style.width) {

			this.fixedWidthSet_ = true;

		} else {

			if (this.maxWidth_ !== 0 && this.div_.offsetWidth > this.maxWidth_) {

				this.div_.style.width = this.maxWidth_;
				this.div_.style.overflow = "auto";
				this.fixedWidthSet_ = true;

			} else { // The following code is needed to overcome problems with MSIE

				bw = this.getBoxWidths_();

				this.div_.style.width = (this.div_.offsetWidth - bw.left - bw.right) + "px";
				this.fixedWidthSet_ = false;
			}
		}

		this.panBox_(this.disableAutoPan_);

		if (!this.enableEventPropagation_) {

			// Cancel event propagation.
			//
			this.eventListener1_ = google.maps.event.addDomListener(this.div_, "mousedown", cancelHandler);
			this.eventListener2_ = google.maps.event.addDomListener(this.div_, "click", cancelHandler);
			this.eventListener3_ = google.maps.event.addDomListener(this.div_, "dblclick", cancelHandler);
			this.eventListener4_ = google.maps.event.addDomListener(this.div_, "mouseover", function(e) {
				this.style.cursor = "default";
			});
		}

		this.contextListener_ = google.maps.event.addDomListener(this.div_, "contextmenu", ignoreHandler);

		/**
		* This event is fired when the DIV containing the InfoBox's content is attached to the DOM.
		* @name InfoBox#domready
		* @event
		*/
		google.maps.event.trigger(this, "domready");
	}
};

/**
* Returns the HTML <IMG> tag for the close box.
* @private
*/
InfoBox.prototype.getCloseBoxImg_ = function() {

	var img = "";

	if (this.closeBoxURL_ !== "") {

		img = "<img";
		img += " src='" + this.closeBoxURL_ + "'";
		img += " align=right"; // Do this because Opera chokes on style='float: right;'
		img += " style='";
		img += " position: relative;"; // Required by MSIE
		img += " cursor: pointer;";
		img += " margin: " + this.closeBoxMargin_ + ";";
		img += "'>";
	}

	return img;
};

/**
* Adds the click handler to the InfoBox close box.
* @private
*/
InfoBox.prototype.addClickHandler_ = function() {

	var closeBox;

	if (this.closeBoxURL_ !== "") {

		closeBox = this.div_.firstChild;
		this.closeListener_ = google.maps.event.addDomListener(closeBox, 'click', this.getCloseClickHandler_());

	} else {

		this.closeListener_ = null;
	}
};

/**
* Returns the function to call when the user clicks the close box of an InfoBox.
* @private
*/
InfoBox.prototype.getCloseClickHandler_ = function() {

	var me = this;

	return function(e) {

		// 1.0.3 fix: Always prevent propagation of a close box click to the map:
		e.cancelBubble = true;

		if (e.stopPropagation) {

			e.stopPropagation();
		}

		me.close();

		/**
		* This event is fired when the InfoBox's close box is clicked.
		* @name InfoBox#closeclick
		* @event
		*/
		google.maps.event.trigger(me, "closeclick");
	};
};

/**
* Pans the map so that the InfoBox appears entirely within the map's visible area.
* @private
*/
InfoBox.prototype.panBox_ = function(disablePan) {

	var map;
	var bounds;
	var xOffset = 0, yOffset = 0;

	if (!disablePan) {

		map = this.getMap();

		if (map instanceof google.maps.Map) { // Only pan if attached to map, not panorama

			if (!map.getBounds().contains(this.position_)) {
				// Marker not in visible area of map, so set center
				// of map to the marker position first.
				map.setCenter(this.position_);
			}

			bounds = map.getBounds();

			var mapDiv = map.getDiv();
			var mapWidth = mapDiv.offsetWidth;
			var mapHeight = mapDiv.offsetHeight;
			var iwOffsetX = this.pixelOffset_.width;
			var iwOffsetY = this.pixelOffset_.height;
			var iwWidth = this.div_.offsetWidth;
			var iwHeight = this.div_.offsetHeight;
			var padX = this.infoBoxClearance_.width;
			var padY = this.infoBoxClearance_.height;
			var pixPosition = this.getProjection().fromLatLngToContainerPixel(this.position_);

			if (pixPosition.x < (-iwOffsetX + padX)) {
				xOffset = pixPosition.x + iwOffsetX - padX;
			} else if ((pixPosition.x + iwWidth + iwOffsetX + padX) > mapWidth) {
				xOffset = pixPosition.x + iwWidth + iwOffsetX + padX - mapWidth;
			}
			if (this.alignBottom_) {
				if (pixPosition.y < (-iwOffsetY + padY + iwHeight)) {
					yOffset = pixPosition.y + iwOffsetY - padY - iwHeight;
				} else if ((pixPosition.y + iwOffsetY + padY) > mapHeight) {
					yOffset = pixPosition.y + iwOffsetY + padY - mapHeight;
				}
			} else {
				if (pixPosition.y < (-iwOffsetY + padY)) {
					yOffset = pixPosition.y + iwOffsetY - padY;
				} else if ((pixPosition.y + iwHeight + iwOffsetY + padY) > mapHeight) {
					yOffset = pixPosition.y + iwHeight + iwOffsetY + padY - mapHeight;
				}
			}

			if (!(xOffset === 0 && yOffset === 0)) {

				// Move the map to the shifted center.
				//
				var c = map.getCenter();
				map.panBy(xOffset, yOffset);
			}
		}
	}
};

/**
* Sets the style of the InfoBox by setting the style sheet and applying
* other specific styles requested.
* @private
*/
InfoBox.prototype.setBoxStyle_ = function() {

	var i, boxStyle;

	if (this.div_) {

		// Apply style values from the style sheet defined in the boxClass parameter:
		this.div_.className = this.boxClass_;

		// Clear existing inline style values:
		this.div_.style.cssText = "";

		// Apply style values defined in the boxStyle parameter:
		boxStyle = this.boxStyle_;
		for (i in boxStyle) {

			if (boxStyle.hasOwnProperty(i)) {

				this.div_.style[i] = boxStyle[i];
			}
		}

		// Fix up opacity style for benefit of MSIE:
		//
		if (typeof this.div_.style.opacity !== "undefined" && this.div_.style.opacity !== "") {

			this.div_.style.filter = "alpha(opacity=" + (this.div_.style.opacity * 100) + ")";
		}

		// Apply required styles:
		//
		this.div_.style.position = "absolute";
		this.div_.style.visibility = 'hidden';
		if (this.zIndex_ !== null) {

			this.div_.style.zIndex = this.zIndex_;
		}
	}
};

/**
* Get the widths of the borders of the InfoBox.
* @private
* @return {Object} widths object (top, bottom left, right)
*/
InfoBox.prototype.getBoxWidths_ = function() {

	var computedStyle;
	var bw = { top: 0, bottom: 0, left: 0, right: 0 };
	var box = this.div_;

	if (document.defaultView && document.defaultView.getComputedStyle) {

		computedStyle = box.ownerDocument.defaultView.getComputedStyle(box, "");

		if (computedStyle) {

			// The computed styles are always in pixel units (good!)
			bw.top = parseInt(computedStyle.borderTopWidth, 10) || 0;
			bw.bottom = parseInt(computedStyle.borderBottomWidth, 10) || 0;
			bw.left = parseInt(computedStyle.borderLeftWidth, 10) || 0;
			bw.right = parseInt(computedStyle.borderRightWidth, 10) || 0;
		}

	} else if (document.documentElement.currentStyle) { // MSIE

		if (box.currentStyle) {

			// The current styles may not be in pixel units, but assume they are (bad!)
			bw.top = parseInt(box.currentStyle.borderTopWidth, 10) || 0;
			bw.bottom = parseInt(box.currentStyle.borderBottomWidth, 10) || 0;
			bw.left = parseInt(box.currentStyle.borderLeftWidth, 10) || 0;
			bw.right = parseInt(box.currentStyle.borderRightWidth, 10) || 0;
		}
	}

	return bw;
};

/**
* Invoked when <tt>close</tt> is called. Do not call it directly.
*/
InfoBox.prototype.onRemove = function() {

	if (this.div_) {

		this.div_.parentNode.removeChild(this.div_);
		this.div_ = null;
	}
};

/**
* Draws the InfoBox based on the current map projection and zoom level.
*/
InfoBox.prototype.draw = function() {

	this.createInfoBoxDiv_();

	var pixPosition = this.getProjection().fromLatLngToDivPixel(this.position_);

	this.div_.style.left = (pixPosition.x + this.pixelOffset_.width) + "px";

	if (this.alignBottom_) {
		this.div_.style.bottom = -(Math.round(pixPosition.y) + this.pixelOffset_.height) + "px";
	} else {
		this.div_.style.top = (Math.round(pixPosition.y) + this.pixelOffset_.height) + "px";
	}

	if (this.isHidden_) {

		this.div_.style.visibility = 'hidden';

	} else {

		this.div_.style.visibility = "visible";
	}
};

/**
* Sets the options for the InfoBox. Note that changes to the <tt>maxWidth</tt>,
*  <tt>closeBoxMargin</tt>, <tt>closeBoxURL</tt>, and <tt>enableEventPropagation</tt>
*  properties have no affect until the current InfoBox is <tt>close</tt>d and a new one
*  is <tt>open</tt>ed.
* @param {InfoBoxOptions} opt_opts
*/
InfoBox.prototype.setOptions = function(opt_opts) {
	if (typeof opt_opts.boxClass !== "undefined") { // Must be first

		this.boxClass_ = opt_opts.boxClass;
		this.setBoxStyle_();
	}
	if (typeof opt_opts.boxStyle !== "undefined") { // Must be second

		this.boxStyle_ = opt_opts.boxStyle;
		this.setBoxStyle_();
	}
	if (typeof opt_opts.content !== "undefined") {

		this.setContent(opt_opts.content);
	}
	if (typeof opt_opts.disableAutoPan !== "undefined") {

		this.disableAutoPan_ = opt_opts.disableAutoPan;
	}
	if (typeof opt_opts.maxWidth !== "undefined") {

		this.maxWidth_ = opt_opts.maxWidth;
	}
	if (typeof opt_opts.pixelOffset !== "undefined") {

		this.pixelOffset_ = opt_opts.pixelOffset;
	}
	if (typeof opt_opts.alignBottom !== "undefined") {

		this.alignBottom_ = opt_opts.alignBottom;
	}
	if (typeof opt_opts.position !== "undefined") {

		this.setPosition(opt_opts.position);
	}
	if (typeof opt_opts.zIndex !== "undefined") {

		this.setZIndex(opt_opts.zIndex);
	}
	if (typeof opt_opts.closeBoxMargin !== "undefined") {

		this.closeBoxMargin_ = opt_opts.closeBoxMargin;
	}
	if (typeof opt_opts.closeBoxURL !== "undefined") {

		this.closeBoxURL_ = opt_opts.closeBoxURL;
	}
	if (typeof opt_opts.infoBoxClearance !== "undefined") {

		this.infoBoxClearance_ = opt_opts.infoBoxClearance;
	}
	if (typeof opt_opts.isHidden !== "undefined") {

		this.isHidden_ = opt_opts.isHidden;
	}
	if (typeof opt_opts.enableEventPropagation !== "undefined") {

		this.enableEventPropagation_ = opt_opts.enableEventPropagation;
	}

	if (this.div_) {

		this.draw();
	}
};

/**
* Sets the content of the InfoBox.
*  The content can be plain text or an HTML DOM node.
* @param {string|Node} content
*/
InfoBox.prototype.setContent = function(content) {
	this.content_ = content;

	if (this.div_) {

		if (this.closeListener_) {

			google.maps.event.removeListener(this.closeListener_);
			this.closeListener_ = null;
		}

		// Odd code required to make things work with MSIE.
		//
		if (!this.fixedWidthSet_) {

			this.div_.style.width = "";
		}

		if (typeof content.nodeType === "undefined") {
			this.div_.innerHTML = this.getCloseBoxImg_() + content;
		} else {
			this.div_.innerHTML = this.getCloseBoxImg_();
			this.div_.appendChild(content);
		}

		// Perverse code required to make things work with MSIE.
		// (Ensures the close box does, in fact, float to the right.)
		//
		if (!this.fixedWidthSet_) {
			this.div_.style.width = this.div_.offsetWidth + "px";
			if (typeof content.nodeType === "undefined") {
				this.div_.innerHTML = this.getCloseBoxImg_() + content;
			} else {
				this.div_.innerHTML = this.getCloseBoxImg_();
				this.div_.appendChild(content);
			}
		}

		this.addClickHandler_();
	}

	/**
	* This event is fired when the content of the InfoBox changes.
	* @name InfoBox#content_changed
	* @event
	*/
	google.maps.event.trigger(this, "content_changed");
};

/**
* Sets the geographic location of the InfoBox.
* @param {LatLng} latlng
*/
InfoBox.prototype.setPosition = function(latlng) {

	this.position_ = latlng;

	if (this.div_) {

		this.draw();
	}

	/**
	* This event is fired when the position of the InfoBox changes.
	* @name InfoBox#position_changed
	* @event
	*/
	google.maps.event.trigger(this, "position_changed");
};

/**
* Sets the zIndex style for the InfoBox.
* @param {number} index
*/
InfoBox.prototype.setZIndex = function(index) {

	this.zIndex_ = index;

	if (this.div_) {

		this.div_.style.zIndex = index;
	}

	/**
	* This event is fired when the zIndex of the InfoBox changes.
	* @name InfoBox#zindex_changed
	* @event
	*/
	google.maps.event.trigger(this, "zindex_changed");
};

/**
* Returns the content of the InfoBox.
* @returns {string}
*/
InfoBox.prototype.getContent = function() {

	return this.content_;
};

/**
* Returns the geographic location of the InfoBox.
* @returns {LatLng}
*/
InfoBox.prototype.getPosition = function() {

	return this.position_;
};

/**
* Returns the zIndex for the InfoBox.
* @returns {number}
*/
InfoBox.prototype.getZIndex = function() {

	return this.zIndex_;
};

/**
* Shows the InfoBox.
*/
InfoBox.prototype.show = function() {

	this.isHidden_ = false;
	if (this.div_) {
		this.div_.style.visibility = "visible";
	}
};

/**
* Hides the InfoBox.
*/
InfoBox.prototype.hide = function() {

	this.isHidden_ = true;
	if (this.div_) {
		this.div_.style.visibility = "hidden";
	}
};

/**
* Adds the InfoBox to the specified map or Street View panorama. If <tt>anchor</tt>
*  (usually a <tt>google.maps.Marker</tt>) is specified, the position
*  of the InfoBox is set to the position of the <tt>anchor</tt>. If the
*  anchor is dragged to a new location, the InfoBox moves as well.
* @param {Map|StreetViewPanorama} map
* @param {MVCObject} [anchor]
*/
InfoBox.prototype.open = function(map, anchor) {

	var me = this;

	if (anchor) {

		this.position_ = anchor.getPosition();
		this.moveListener_ = google.maps.event.addListener(anchor, "position_changed", function() {
			me.setPosition(this.getPosition());
		});
	}

	this.setMap(map);

	if (this.div_) {

		this.panBox_();
	}
};

/**
* Removes the InfoBox from the map.
*/
InfoBox.prototype.close = function() {

	if (this.closeListener_) {

		google.maps.event.removeListener(this.closeListener_);
		this.closeListener_ = null;
	}

	if (this.eventListener1_) {

		google.maps.event.removeListener(this.eventListener1_);
		google.maps.event.removeListener(this.eventListener2_);
		google.maps.event.removeListener(this.eventListener3_);
		google.maps.event.removeListener(this.eventListener4_);
		this.eventListener1_ = null;
		this.eventListener2_ = null;
		this.eventListener3_ = null;
		this.eventListener4_ = null;
	}

	if (this.moveListener_) {

		google.maps.event.removeListener(this.moveListener_);
		this.moveListener_ = null;
	}

	if (this.contextListener_) {

		google.maps.event.removeListener(this.contextListener_);
		this.contextListener_ = null;
	}

	this.setMap(null);
};