/**
 * @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 listings 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.
 * @listing {string|Node} content The content of the InfoBox (plain text or an HTML DOM node).
 * @listing {boolean} disableAutoPan Disable auto-pan on <tt>open</tt> (default is <tt>false</tt>).
 * @listing {number} maxWidth The maximum width (in pixels) of the InfoBox. Set to 0 if no maximum.
 * @listing {Size} pixelOffset The offset (in pixels) from the top left corner of the InfoBox
 *  (or the bottom left corner if the <code>alignBottom</code> listing is <code>true</code>)
 *  to the map pixel corresponding to <tt>position</tt>.
 * @listing {LatLng} position The geographic location at which to display the InfoBox.
 * @listing {number} zIndex The CSS z-index style value for the InfoBox.
 *  Note: This value overrides a zIndex setting specified in the <tt>boxStyle</tt> listing.
 * @listing {string} boxClass The name of the CSS class defining the styles for the InfoBox container.
 *  The default name is <code>infoBox</code>.
 * @listing {Object} [boxStyle] An object literal whose listings 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 listing 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.
 * @listing {string} closeBoxMargin The CSS margin style value for the close box.
 *  The default is "2px" (a 2-pixel margin on all sides).
 * @listing {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 listing to "" if no close box is required.
 * @listing {Size} infoBoxClearance Minimum offset (in pixels) from the InfoBox to the
 *  map edge after an auto-pan.
 * @listing {boolean} isHidden Hide the InfoBox on <tt>open</tt> (default is <tt>false</tt>).
 * @listing {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).
 * @listing {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 listing names for the <tt>google.maps.MapPanes</tt> object.
 * @listing {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 listing to <tt>true</tt> if the InfoBox
 *  is being used as a map label. iPhone note: This listing 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 = '<a aria-label="close" data-dismiss="alert" class="close" href="javascript:void(0);">×</a>';
    }

    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.hasOwnListing(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 = -(pixPosition.y + this.pixelOffset_.height) + "px";
    } else {
        this.div_.style.top = (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>
 *  listings 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);
};
