

var container = document.getElementById('popup');
var content = document.getElementById('popup-content');
var closer = document.getElementById('popup-closer');
var sketch;

closer.onclick = function() {
    container.style.display = 'none';
    closer.blur();
    return false;
};
var overlayPopup = new ol.Overlay({
    element: container
});

var expandedAttribution = new ol.control.Attribution({
    collapsible: false
});

var map = new ol.Map({
    controls: ol.control.defaults({attribution:false}).extend([
        expandedAttribution
    ]),
    target: document.getElementById('map'),
    renderer: 'canvas',
    overlays: [overlayPopup],
    layers: layersList,
    view: new ol.View({
         maxZoom: 28, minZoom: 6
    })
});


map.getView().fit([-20029584.112125, 6791898.372372, 20031878.278667, 10386611.256525], map.getSize());

var NO_POPUP = 0
var ALL_FIELDS = 1

/**
 * Returns either NO_POPUP, ALL_FIELDS or the name of a single field to use for
 * a given layer
 * @param layerList {Array} List of ol.Layer instances
 * @param layer {ol.Layer} Layer to find field info about
 */
function getPopupFields(layerList, layer) {
    // Determine the index that the layer will have in the popupLayers Array,
    // if the layersList contains more items than popupLayers then we need to
    // adjust the index to take into account the base maps group
    var idx = layersList.indexOf(layer) - (layersList.length - popupLayers.length);
    return popupLayers[idx];
}


var collection = new ol.Collection();
var featureOverlay = new ol.layer.Vector({
    map: map,
    source: new ol.source.Vector({
        features: collection,
        useSpatialIndex: false // optional, might improve performance
    }),
    style: [new ol.style.Style({
        stroke: new ol.style.Stroke({
            color: '#f00',
            width: 1
        }),
        fill: new ol.style.Fill({
            color: 'rgba(255,0,0,0.1)'
        }),
    })],
    updateWhileAnimating: true, // optional, for instant visual feedback
    updateWhileInteracting: true // optional, for instant visual feedback
});

var doHighlight = false;
var doHover = false;

var highlight;
var autolinker = new Autolinker({truncate: {length: 30, location: 'smart'}});
var onPointerMove = function(evt) {
    if (!doHover && !doHighlight) {
        return;
    }
    var pixel = map.getEventPixel(evt.originalEvent);
    var coord = evt.coordinate;
    var popupField;
    var currentFeature;
    var currentLayer;
    var currentFeatureKeys;
    var clusteredFeatures;
    var popupText = '<ul>';
    map.forEachFeatureAtPixel(pixel, function(feature, layer) {
        // We only care about features from layers in the layersList, ignore
        // any other layers which the map might contain such as the vector
        // layer used by the measure tool
        if (layersList.indexOf(layer) === -1) {
            return;
        }
        var doPopup = false;
        for (k in layer.get('fieldImages')) {
            if (layer.get('fieldImages')[k] != "Hidden") {
                doPopup = true;
            }
        }
        currentFeature = feature;
        currentLayer = layer;
        clusteredFeatures = feature.get("features");
        var clusterFeature;
        if (typeof clusteredFeatures !== "undefined") {
            if (doPopup) {
                for(var n=0; n<clusteredFeatures.length; n++) {
                    clusterFeature = clusteredFeatures[n];
                    currentFeatureKeys = clusterFeature.getKeys();
                    popupText += '<li><table>'
                    for (var i=0; i<currentFeatureKeys.length; i++) {
                        if (currentFeatureKeys[i] != 'geometry') {
                            popupField = '';
                            if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "inline label") {
                            popupField += '<th>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</th><td>';
                            } else {
                                popupField += '<td colspan="2">';
                            }
                            if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "header label") {
                                popupField += '<strong>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</strong><br />';
                            }
                            if (layer.get('fieldImages')[currentFeatureKeys[i]] != "ExternalResource") {
                                popupField += (clusterFeature.get(currentFeatureKeys[i]) != null ? autolinker.link(clusterFeature.get(currentFeatureKeys[i]).toLocaleString()) + '</td>' : '');
                            } else {
                                popupField += (clusterFeature.get(currentFeatureKeys[i]) != null ? '<img src="images/' + clusterFeature.get(currentFeatureKeys[i]).replace(/[\\\/:]/g, '_').trim()  + '" /></td>' : '');
                            }
                            popupText += '<tr>' + popupField + '</tr>';
                        }
                    } 
                    popupText += '</table></li>';    
                }
            }
        } else {
            currentFeatureKeys = currentFeature.getKeys();
            if (doPopup) {
                popupText += '<li><table>';
                for (var i=0; i<currentFeatureKeys.length; i++) {
                    if (currentFeatureKeys[i] != 'geometry') {
                        popupField = '';
                        if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "inline label") {
                            popupField += '<th>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</th><td>';
                        } else {
                            popupField += '<td colspan="2">';
                        }
                        if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "header label") {
                            popupField += '<strong>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</strong><br />';
                        }
                        if (layer.get('fieldImages')[currentFeatureKeys[i]] != "ExternalResource") {
                            popupField += (currentFeature.get(currentFeatureKeys[i]) != null ? autolinker.link(currentFeature.get(currentFeatureKeys[i]).toLocaleString()) + '</td>' : '');
                        } else {
                            popupField += (currentFeature.get(currentFeatureKeys[i]) != null ? '<img src="images/' + currentFeature.get(currentFeatureKeys[i]).replace(/[\\\/:]/g, '_').trim()  + '" /></td>' : '');
                        }
                        popupText += '<tr>' + popupField + '</tr>';
                    }
                }
                popupText += '</table></li>';
            }
        }
    });
    if (popupText == '<ul>') {
        popupText = '';
    } else {
        popupText += '</ul>';
    }

    if (doHighlight) {
        if (currentFeature !== highlight) {
            if (highlight) {
                featureOverlay.getSource().removeFeature(highlight);
            }
            if (currentFeature) {
                var styleDefinition = currentLayer.getStyle().toString();

                if (currentFeature.getGeometry().getType() == 'Point') {
                    var radius = styleDefinition.split('radius')[1].split(' ')[1];

                    highlightStyle = new ol.style.Style({
                        image: new ol.style.Circle({
                            fill: new ol.style.Fill({
                                color: "#ffff00"
                            }),
                            radius: radius
                        })
                    })
                } else if (currentFeature.getGeometry().getType() == 'LineString') {

                    var featureWidth = styleDefinition.split('width')[1].split(' ')[1].replace('})','');

                    highlightStyle = new ol.style.Style({
                        stroke: new ol.style.Stroke({
                            color: '#ffff00',
                            lineDash: null,
                            width: featureWidth
                        })
                    });

                } else {
                    highlightStyle = new ol.style.Style({
                        fill: new ol.style.Fill({
                            color: '#ffff00'
                        })
                    })
                }
                featureOverlay.getSource().addFeature(currentFeature);
                featureOverlay.setStyle(highlightStyle);
            }
            highlight = currentFeature;
        }
    }

    if (doHover) {
        if (popupText) {
            overlayPopup.setPosition(coord);
            content.innerHTML = popupText;
            container.style.display = 'block';        
        } else {
            container.style.display = 'none';
            closer.blur();
        }
    }
};

var onSingleClick = function(evt) {
    if (doHover) {
        return;
    }
    if (sketch) {
        return;
    }
    var pixel = map.getEventPixel(evt.originalEvent);
    var coord = evt.coordinate;
    var popupField;
    var currentFeature;
    var currentFeatureKeys;
    var clusteredFeatures;
    var popupText = '<ul>';
    map.forEachFeatureAtPixel(pixel, function(feature, layer) {
        if (feature instanceof ol.Feature && (layer.get("interactive") || layer.get("interactive") == undefined)) {
            var doPopup = false;
            for (k in layer.get('fieldImages')) {
                if (layer.get('fieldImages')[k] != "Hidden") {
                    doPopup = true;
                }
            }
            currentFeature = feature;
            clusteredFeatures = feature.get("features");
            var clusterFeature;
            if (typeof clusteredFeatures !== "undefined") {
                if (doPopup) {
                    for(var n=0; n<clusteredFeatures.length; n++) {
                        clusterFeature = clusteredFeatures[n];
                        currentFeatureKeys = clusterFeature.getKeys();
                        popupText += '<li><table>'
                        for (var i=0; i<currentFeatureKeys.length; i++) {
                            if (currentFeatureKeys[i] != 'geometry') {
                                popupField = '';
                                if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "inline label") {
                                popupField += '<th>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</th><td>';
                                } else {
                                    popupField += '<td colspan="2">';
                                }
                                if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "header label") {
                                    popupField += '<strong>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</strong><br />';
                                }
                                if (layer.get('fieldImages')[currentFeatureKeys[i]] != "ExternalResource") {
                                    popupField += (clusterFeature.get(currentFeatureKeys[i]) != null ? autolinker.link(clusterFeature.get(currentFeatureKeys[i]).toLocaleString()) + '</td>' : '');
                                } else {
                                    popupField += (clusterFeature.get(currentFeatureKeys[i]) != null ? '<img src="images/' + clusterFeature.get(currentFeatureKeys[i]).replace(/[\\\/:]/g, '_').trim()  + '" /></td>' : '');
                                }
                                popupText += '<tr>' + popupField + '</tr>';
                            }
                        } 
                        popupText += '</table></li>';    
                    }
                }
            } else {
                currentFeatureKeys = currentFeature.getKeys();
                if (doPopup) {
                    popupText += '<li><table>';
                    for (var i=0; i<currentFeatureKeys.length; i++) {
                        if (currentFeatureKeys[i] != 'geometry') {
                            popupField = '';
                            if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "inline label") {
                                popupField += '<th>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</th><td>';
                            } else {
                                popupField += '<td colspan="2">';
                            }
                            if (layer.get('fieldLabels')[currentFeatureKeys[i]] == "header label") {
                                popupField += '<strong>' + layer.get('fieldAliases')[currentFeatureKeys[i]] + ':</strong><br />';
                            }
                            if (layer.get('fieldImages')[currentFeatureKeys[i]] != "ExternalResource") {
                                popupField += (currentFeature.get(currentFeatureKeys[i]) != null ? autolinker.link(currentFeature.get(currentFeatureKeys[i]).toLocaleString()) + '</td>' : '');
                            } else {
                                popupField += (currentFeature.get(currentFeatureKeys[i]) != null ? '<img src="images/' + currentFeature.get(currentFeatureKeys[i]).replace(/[\\\/:]/g, '_').trim()  + '" /></td>' : '');
                            }
                            popupText += '<tr>' + popupField + '</tr>';
                        }
                    }
                    popupText += '</table>';
                }
            }
        }
    });
    if (popupText == '<ul>') {
        popupText = '';
    } else {
        popupText += '</ul>';
    }
    
    var viewProjection = map.getView().getProjection();
    var viewResolution = map.getView().getResolution();
    for (i = 0; i < wms_layers.length; i++) {
        if (wms_layers[i][1]) {
            var url = wms_layers[i][0].getSource().getGetFeatureInfoUrl(
                evt.coordinate, viewResolution, viewProjection,
                {
                    'INFO_FORMAT': 'text/html',
                });
            if (url) {
                popupText = popupText + '<iframe style="width:100%;height:110px;border:0px;" id="iframe" seamless src="' + url + '"></iframe>';
            }
        }
    }

    if (popupText) {
        overlayPopup.setPosition(coord);
        content.innerHTML = popupText;
        container.style.display = 'block';        
    } else {
        container.style.display = 'none';
        closer.blur();
    }
};



map.on('pointermove', function(evt) {
    onPointerMove(evt);
});
map.on('singleclick', function(evt) {
    onSingleClick(evt);
});




var attributionComplete = false;
map.on("rendercomplete", function(evt) {
    if (!attributionComplete) {
        var attribution = document.getElementsByClassName('ol-attribution')[0];
        var attributionList = attribution.getElementsByTagName('ul')[0];
        var firstLayerAttribution = attributionList.getElementsByTagName('li')[0];
        var qgis2webAttribution = document.createElement('li');
        qgis2webAttribution.innerHTML = '<a href="https://github.com/tomchadwin/qgis2web">qgis2web</a> &middot; ';
        var olAttribution = document.createElement('li');
        olAttribution.innerHTML = '<a href="https://openlayers.org/">OpenLayers</a> &middot; ';
        var qgisAttribution = document.createElement('li');
        qgisAttribution.innerHTML = '<a href="https://qgis.org/">QGIS</a>';
        attributionList.insertBefore(qgis2webAttribution, firstLayerAttribution);
        attributionList.insertBefore(olAttribution, firstLayerAttribution);
        attributionList.insertBefore(qgisAttribution, firstLayerAttribution);
        attributionComplete = true;
    }
})
