/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
 * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 * full text of the license. */

/**
 * @requires OpenLayers/Control.js
 */

/**
 * Class: OpenLayers.Control.LayerSwitcher
 *
 * Inherits from:
 *  - <OpenLayers.Control>
 */
OpenLayers.Control.newLayerSwitcher =
  OpenLayers.Class(OpenLayers.Control, {

    /**
     * Property: layerStates
     * {Array(Object)} Basically a copy of the "state" of the map's layers
     *     the last time the control was drawn. We have this in order to avoid
     *     unnecessarily redrawing the control.
     */
    layerStates: null,


  // DOM Elements

    /**
     * Property: layersDiv
     * {DOMElement}
     */
    layersDiv: null,

    /**
     * Property: baseLayersDiv
     * {DOMElement}
     */
    baseLayersDiv: null,

    /**
     * Property: baseLayers
     * {Array(<OpenLayers.Layer>)}
     */
    baseLayers: null,


    /**
     * Property: dataLbl
     * {DOMElement}
     */
    dataLbl: null,

    /**
     * Property: dataLayersDiv
     * {DOMElement}
     */
    dataLayersDiv: null,

    /**
     * Property: dataLayers
     * {Array(<OpenLayers.Layer>)}
     */
    dataLayers: null,


    /**
     * Property: minimizeDiv
     * {DOMElement}
     */
    minimizeDiv: null,

    /**
     * Property: maximizeDiv
     * {DOMElement}
     */
    maximizeDiv: null,

    /**
     * APIProperty: ascending
     * {Boolean}
     */
    ascending: true,

    /**
     * Constructor: OpenLayers.Control.LayerSwitcher
     *
     * Parameters:
     * options - {Object}
     */
    initialize: function(options) {
        OpenLayers.Control.prototype.initialize.apply(this, arguments);
        this.layerStates = [];
    },

    /**
     * APIMethod: destroy
     */
    destroy: function() {

        OpenLayers.Event.stopObservingElement(this.div);

        OpenLayers.Event.stopObservingElement(this.minimizeDiv);
        OpenLayers.Event.stopObservingElement(this.maximizeDiv);

        //clear out layers info and unregister their events
        this.clearLayersArray("base");
        this.clearLayersArray("data");

        this.map.events.un({
            "addlayer": this.redraw,
            "changelayer": this.redraw,
            "removelayer": this.redraw,
            "changebaselayer": this.redraw,
            scope: this
        });

        OpenLayers.Control.prototype.destroy.apply(this, arguments);
    },

    /**
     * Method: setMap
     *
     * Properties:
     * map - {<OpenLayers.Map>}
     */
    setMap: function(map) {
        OpenLayers.Control.prototype.setMap.apply(this, arguments);

        this.map.events.on({
            "addlayer": this.redraw,
            "changelayer": this.redraw,
            "removelayer": this.redraw,
            "changebaselayer": this.redraw,
            scope: this
        });
    },

    /**
     * Method: draw
     *
     * Returns:
     * {DOMElement} A reference to the DIV DOMElement containing the
     *     switcher tabs.
     */
    draw: function() {
        OpenLayers.Control.prototype.draw.apply(this);

        // create layout divs
        this.loadContents();

        // set mode to minimize
        if(!this.outsideViewport) {
            this.minimizeControl();
        }

        // populate div with current info
        this.redraw();

        return this.div;
    },

    /**
     * Method: clearLayersArray
     * User specifies either "base" or "data". we then clear all the
     *     corresponding listeners, the div, and reinitialize a new array.
     *
     * Parameters:
     * layersType - {String}
     */
    clearLayersArray: function(layersType) {
        var layers = this[layersType + "Layers"];
        if (layers) {
            for(var i=0; i < layers.length; i++) {
                var layer = layers[i];
                OpenLayers.Event.stopObservingElement(layer.inputElem);
                OpenLayers.Event.stopObservingElement(layer.labelSpan);
            }
        }
        this[layersType + "LayersDiv"].innerHTML = "";
        this[layersType + "Layers"] = [];
    },


    /**
     * Method: checkRedraw
     * Checks if the layer state has changed since the last redraw() call.
     *
     * Returns:
     * {Boolean} The layer state changed since the last redraw() call.
     */
    checkRedraw: function() {
        var redraw = false;
        if ( !this.layerStates.length ||
             (this.map.layers.length != this.layerStates.length) ) {
            redraw = true;
        } else {
            for (var i=0; i < this.layerStates.length; i++) {
                var layerState = this.layerStates[i];
                var layer = this.map.layers[i];
                if ( (layerState.name != layer.name) ||
                     (layerState.inRange != layer.inRange) ||
                     (layerState.id != layer.id) ||
                     (layerState.visibility != layer.visibility) ) {
                    redraw = true;
                    break;
                }
            }
        }
        return redraw;
    },

    /**
     * Method: redraw
     * Goes through and takes the current state of the Map and rebuilds the
     *     control to display that state. Groups base layers into a
     *     radio-button group and lists each data layer with a checkbox.
     *
     * Returns:
     * {DOMElement} A reference to the DIV DOMElement containing the control
     */
    redraw: function() {
        //if the state hasn't changed since last redraw, no need
        // to do anything. Just return the existing div.
        if (!this.checkRedraw()) {
            return this.div;
        }

        //clear out previous layers
        this.clearLayersArray("base");
        this.clearLayersArray("data");

        var containsOverlays = false;
        var containsBaseLayers = false;

        // Save state -- for checking layer if the map state changed.
        // We save this before redrawing, because in the process of redrawing
        // we will trigger more visibility changes, and we want to not redraw
        // and enter an infinite loop.
        this.layerStates = new Array(this.map.layers.length);
        for (var i = 0; i < this.map.layers.length; i++) {
            var layer = this.map.layers[i];
            this.layerStates[i] = {
                'name': layer.name,
                'visibility': layer.visibility,
                'inRange': layer.inRange,
                'id': layer.id
            };
        }

        var layers = this.map.layers.slice();
        if (!this.ascending) { layers.reverse(); }
        for( var i = 0; i < layers.length; i++) {
            var layer = layers[i];
            var baseLayer = layer.isBaseLayer;

            if (layer.displayInLayerSwitcher) {

                if (baseLayer) {
                    containsBaseLayers = true;
                } else {
                    containsOverlays = true;
                }

                // only check a baselayer if it is *the* baselayer, check data
                //  layers if they are visible
                var checked = (baseLayer) ? (layer == this.map.baseLayer)
                                          : layer.getVisibility();

                // create input element
                var inputElem = document.createElement("input");
                inputElem.id = "input_" + layer.name;
                inputElem.name = (baseLayer) ? "baseLayers" : layer.name;
                inputElem.type = (baseLayer) ? "radio" : "checkbox";
                inputElem.value = layer.name;
                inputElem.checked = checked;
                inputElem.defaultChecked = checked;

                if (!baseLayer && !layer.inRange) {
                    inputElem.disabled = true;
                }
                var context = {
                    'inputElem': inputElem,
                    'layer': layer,
                    'layerSwitcher': this
                };
                OpenLayers.Event.observe(inputElem, "mouseup",
                    OpenLayers.Function.bindAsEventListener(this.onInputClick,
                                                            context)
                );

                // create span
                var labelSpan = document.createElement("span");
                if (!baseLayer && !layer.inRange) {
                    labelSpan.style.color = "gray";
                }
                labelSpan.innerHTML = layer.name;
                labelSpan.style.verticalAlign = (baseLayer) ? "bottom"
                                                            : "baseline";
                OpenLayers.Event.observe(labelSpan, "click",
                    OpenLayers.Function.bindAsEventListener(this.onInputClick,
                                                            context)
                );
                // create line break
                var br = document.createElement("br");


                var groupArray = (baseLayer) ? this.baseLayers
                                             : this.dataLayers;
                groupArray.push({
                    'layer': layer,
                    'inputElem': inputElem,
                    'labelSpan': labelSpan
                });


                var groupDiv = (baseLayer) ? this.baseLayersDiv
                                           : this.dataLayersDiv;
                groupDiv.appendChild(inputElem);
                groupDiv.appendChild(labelSpan);
                groupDiv.appendChild(br);
            }
        }

        // if no overlays, dont display the overlay label
        this.dataLbl.style.display = (containsOverlays) ? "" : "none";

        // if no baselayers, dont display the baselayer label
        this.baseLbl.style.display = (containsBaseLayers) ? "" : "none";

        return this.div;
    },

    /**
     * Method:
     * A label has been clicked, check or uncheck its corresponding input
     *
     * Parameters:
     * e - {Event}
     *
     * Context:
     *  - {DOMElement} inputElem
     *  - {<OpenLayers.Control.LayerSwitcher>} layerSwitcher
     *  - {<OpenLayers.Layer>} layer
     */

    onInputClick: function(e) {

        if (!this.inputElem.disabled) {
            if (this.inputElem.type == "radio") {
                this.inputElem.checked = true;
                this.layer.map.setBaseLayer(this.layer);
				doTheFunkyBar();
				if(this.layer.name == "Gróðurkort" || this.layer.name == "SPOT Gervitunglamyndir")
				{
					$j("#map").css("background-color","#ffffff");
				}				
				else if(this.layer.name == "Atlaskort LMÍ")
				{
					$j("#map").css("background-color","#000000");
				}
				else
				{
					$j("#map").css("background-color","#3E6582");
				}
			} else {
                this.inputElem.checked = !this.inputElem.checked;
                this.layerSwitcher.updateMap();
            }
        }
        OpenLayers.Event.stop(e);
    },

    /**
     * Method: onLayerClick
     * Need to update the map accordingly whenever user clicks in either of
     *     the layers.
     *
     * Parameters:
     * e - {Event}
     */
    onLayerClick: function(e) {
        this.updateMap();
    },


    /**
     * Method: updateMap
     * Cycles through the loaded data and base layer input arrays and makes
     *     the necessary calls to the Map object such that that the map's
     *     visual state corresponds to what the user has selected in
     *     the control.
     */
    updateMap: function() {

        // set the newly selected base layer
        for(var i=0; i < this.baseLayers.length; i++) {
            var layerEntry = this.baseLayers[i];
            if (layerEntry.inputElem.checked) {
                this.map.setBaseLayer(layerEntry.layer, false);
            }
        }

        // set the correct visibilities for the overlays
        for(var i=0; i < this.dataLayers.length; i++) {
            var layerEntry = this.dataLayers[i];
            layerEntry.layer.setVisibility(layerEntry.inputElem.checked);
        }

    },

    /**
     * Method: maximizeControl
     * Set up the labels and divs for the control
     *
     * Parameters:
     * e - {Event}
     */
    maximizeControl: function(e) {

        //HACK HACK HACK - find a way to auto-size this layerswitcher
        this.div.style.width = "20em";
        this.div.style.height = "";

        this.showControls(false);

        if (e != null) {
            OpenLayers.Event.stop(e);
        }
    },

    /**
     * Method: minimizeControl
     * Hide all the contents of the control, shrink the size,
     *     add the maximize icon
     *
     * Parameters:
     * e - {Event}
     */
    minimizeControl: function(e) {

        this.div.style.width = "0px";
        this.div.style.height = "0px";

        this.showControls(true);

        if (e != null) {
            OpenLayers.Event.stop(e);
        }
    },

    /**
     * Method: showControls
     * Hide/Show all LayerSwitcher controls depending on whether we are
     *     minimized or not
     *
     * Parameters:
     * minimize - {Boolean}
     */
    showControls: function(minimize) {
        this.maximizeDiv.style.display = minimize ? "block" : "none";
        this.minimizeDiv.style.display = minimize ? "none" : "block";
        this.layersDiv.style.display = minimize ? "none" : "block";
    },

    /**
     * Method: loadContents
     * Set up the labels and divs for the control
     */
    loadContents: function() {
        //configure main div
        this.div.id = ( this.div.id == ""
                      ? "olControlLayerSwitcher"
                      : this.div.id );

        // force className?
        //this.div.className = "olControlLayerSwitcher";

        OpenLayers.Event.observe(this.div, "mouseup",
            OpenLayers.Function.bindAsEventListener(this.mouseUp, this));
        OpenLayers.Event.observe(this.div, "click",
                      this.ignoreEvent);
        OpenLayers.Event.observe(this.div, "mousedown",
            OpenLayers.Function.bindAsEventListener(this.mouseDown, this));
        OpenLayers.Event.observe(this.div, "dblclick", this.ignoreEvent);

        // layers list div
        this.layersDiv = document.createElement("div");
        this.layersDiv.id = "layersDiv";
        this.layersDiv.className = this.displayClass + 'Layer';

        this.baseLbl = document.createElement("div");
        this.baseLbl.innerHTML = OpenLayers.i18n("baseLayer");
        this.baseLbl.className = this.displayClass + 'BaseLabel';

        this.baseLayersDiv = document.createElement("div");
        this.baseLayersDiv.className = this.displayClass + 'BaseLayer';
        /*OpenLayers.Event.observe(this.baseLayersDiv, "click",
            OpenLayers.Function.bindAsEventListener(this.onLayerClick, this));
        */

        this.dataLbl = document.createElement("div");
        this.dataLbl.innerHTML = OpenLayers.i18n("overlays");
        this.dataLbl.className = this.displayClass + 'DataLabel';

        this.dataLayersDiv = document.createElement("div");
        this.dataLayersDiv.className = this.displayClass + 'DataLayer';

        if (this.ascending) {
            this.layersDiv.appendChild(this.baseLbl);
            this.layersDiv.appendChild(this.baseLayersDiv);
            this.layersDiv.appendChild(this.dataLbl);
            this.layersDiv.appendChild(this.dataLayersDiv);
        } else {
            this.layersDiv.appendChild(this.dataLbl);
            this.layersDiv.appendChild(this.dataLayersDiv);
            this.layersDiv.appendChild(this.baseLbl);
            this.layersDiv.appendChild(this.baseLayersDiv);
        }

        this.div.appendChild(this.layersDiv);


        // maximize button div
        this.maximizeDiv = document.createElement("div");
        this.maximizeDiv.id = this.div.id+'MaximizeDiv';
        this.maximizeDiv.className = this.displayClass + 'MaximizeButton';
        OpenLayers.Event.observe(this.maximizeDiv, "click",
            OpenLayers.Function.bindAsEventListener(this.maximizeControl, this)
        );
        this.div.appendChild(this.maximizeDiv);

        // minimize button div
        this.minimizeDiv = document.createElement('div');
        this.minimizeDiv.id = this.div.id+'MinimizeDiv';
        this.minimizeDiv.className = this.displayClass + 'MinimizeButton';
        OpenLayers.Event.observe(this.minimizeDiv, "click",
            OpenLayers.Function.bindAsEventListener(this.minimizeControl, this)
        );
        this.div.appendChild(this.minimizeDiv);
    },

    /**
     * Method: ignoreEvent
     *
     * Parameters:
     * evt - {Event}
     */
    ignoreEvent: function(evt) {
        OpenLayers.Event.stop(evt);
    },

    /**
     * Method: mouseDown
     * Register a local 'mouseDown' flag so that we'll know whether or not
     *     to ignore a mouseUp event
     *
     * Parameters:
     * evt - {Event}
     */
    mouseDown: function(evt) {
        this.isMouseDown = true;
        this.ignoreEvent(evt);
    },

    /**
     * Method: mouseUp
     * If the 'isMouseDown' flag has been set, that means that the drag was
     *     started from within the LayerSwitcher control, and thus we can
     *     ignore the mouseup. Otherwise, let the Event continue.
     *
     * Parameters:
     * evt - {Event}
     */
    mouseUp: function(evt) {
        if (this.isMouseDown) {
            this.isMouseDown = false;
            this.ignoreEvent(evt);
        }
    },

    CLASS_NAME: "OpenLayers.Control.newLayerSwitcher"
});