/* Copyright (C) 2008-2011 Étienne Loks  <etienne.loks_AT_peacefrogsDOTnet>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

See the file COPYING for details.
*/

/* map edit */

var map;
var currentControl;

/* availaible map layers */
var vectors = new OpenLayers.Layer.Vector("Vector Layer");

vectors.events.on({
 "featuremodified": updateForm,
 "featureadded": featureCreated
});

var currentFeature;
function featureCreated(event) {
    /* toggle to edition mode */
    pathCreate.deactivate();
    currentControl = pathModify;
    var help_route_create = document.getElementById('help-route-create');
    if (help_route_create){
        help_route_create.style.display = 'None';
    }
    document.getElementById('help-route-modify').style.display = 'block';
    pathModify.activate();
    updateForm(event);
    pathModify.selectControl.select(event.feature);
}

function initFeature(json_geometry){
    var json = new OpenLayers.Format.JSON();
    var polyline = json.read(json_geometry);
    var point_array = new Array();
    for (i=0; i<polyline.coordinates.length; i++){
        var point = new OpenLayers.Geometry.Point(polyline.coordinates[i][0],
                                                  polyline.coordinates[i][1]);
        point_array.push(point);
    }
    var linestring = new OpenLayers.Geometry.LineString(point_array);
    initFeatureFromGeometry(linestring);
}

function initFeatureFromWkt(wkt_geometry){
    var linestring = OpenLayers.Geometry.fromWKT(wkt_geometry);
    initFeatureFromGeometry(linestring);
}

function initFeatureFromGeometry(linestring){
    linestring.transform(epsg_display_projection, map.getProjectionObject());
    currentFeature = new OpenLayers.Feature.Vector();
    currentFeature.geometry = linestring;
    vectors.removeFeatures();
    vectors.addFeatures([currentFeature]);
    currentControl = pathModify;
    /*zoom to the route*/
    var bounds = vectors.getDataExtent();
    if (bounds) map.zoomToExtent(bounds);
}

function updateForm(event) {
    /* update the form */
    currentFeature = event.feature;
    var current_geo = currentFeature.geometry.clone();
    current_geo.transform(map.getProjectionObject(),
                          epsg_display_projection);
    document.getElementById('id_route').value = current_geo;
    var vertices = current_geo.getVertices();
    var associated_point = document.getElementById('id_point');
    if (vertices && associated_point){
        associated_point.value = vertices[0];
    }
}


/* path control */
var pathCreate = new OpenLayers.Control.DrawFeature(vectors,
                                            OpenLayers.Handler.Path);
var currentControl = pathCreate;

var pathModify = new OpenLayers.Control.ModifyFeature(vectors,
                {clickout:false, toggle:false});

/* main initialisation function */
function init(){
    var options = {
        controls:[new OpenLayers.Control.Navigation(),
                  new OpenLayers.Control.PanPanel(),
                  new OpenLayers.Control.ZoomPanel(),
                  new OpenLayers.Control.Attribution(),
                  pathCreate,
                  pathModify],
        maxResolution: 156543.0399,
        units: 'm',
        projection: epsg_projection,
        displayProjection: epsg_display_projection
    };
    if (restricted_extent){
        restricted_extent.transform(epsg_display_projection, epsg_projection);
        options['restrictedExtent'] = restricted_extent;
    }

    map = new OpenLayers.Map('map_edit', options);

    vectors.setOpacity(0.5);
    map.addLayers([map_layer, vectors]);
    /* zoom to the appropriate extent */
    if (!zoomToCurrentExtent(map)){
        map.setCenter(centerLonLat, 12);
    }
}

function toggleDrawOn() {
    currentControl.activate();
    document.getElementById('draw-toggle-off').style.display = 'None';
    document.getElementById('draw-toggle-on').style.display = 'block';
    if (currentFeature){
        pathModify.selectControl.select(currentFeature);
    }
}

function toggleDrawOff() {
    currentControl.deactivate();
    document.getElementById('draw-toggle-on').style.display = 'None';
    document.getElementById('draw-toggle-off').style.display = 'block';
}

function checkFields(){
    if (!jQuery("#id_name").val() ||
        !jQuery("#id_categories").val()){
        return false;
    }
    return true;
}

function uploadFile(error_msg) {
    if(!checkFields()){
        alert(error_msg);
        return;
    }
    open_window(extra_url + 'upload_file');
}