'use strict';

TABS.gps = {};
TABS.gps.initialize = function (callback) {

    if (GUI.active_tab != 'gps') {
        GUI.active_tab = 'gps';
        googleAnalytics.sendAppView('GPS');
    }

    function load_html() {
        $('#content').load("./tabs/gps.html", process_html);
    }

    load_html();

    let cursorInitialized = false;
    let iconStyle;
    let mapHandler;
    let iconGeometry;
    let iconFeature;

    function process_html() {
        localize();

        let mapView = new ol.View({
            center: ol.proj.fromLonLat([0, 0]),
            zoom: 15
        });
        
        let mapLayer;

        if (globalSettings.mapProviderType == 'bing') {
            mapLayer = new ol.source.BingMaps({
                key: globalSettings.mapApiKey,
                imagerySet: 'AerialWithLabels',
                maxZoom: 19
            });
        } else {
            mapLayer = new ol.source.OSM();
        }

        mapHandler = new ol.Map({
            target: document.getElementById('gps-map'),
            layers: [
                new ol.layer.Tile({
                    source: mapLayer
                })
            ],
            view: mapView
        });

        let center = ol.proj.fromLonLat([0, 0]);
        mapView.setCenter(center);
        mapView.setZoom(2);

        function get_raw_gps_data() {
            MSP.send_message(MSPCodes.MSP_RAW_GPS, false, false, get_comp_gps_data);
        }

        function get_comp_gps_data() {
            MSP.send_message(MSPCodes.MSP_COMP_GPS, false, false, get_gpsstatistics_data);
        }

        function get_gpsstatistics_data() {
            MSP.send_message(MSPCodes.MSP_GPSSTATISTICS, false, false, update_ui);
        }

        function update_ui() {

            let lat = GPS_DATA.lat / 10000000;
            let lon = GPS_DATA.lon / 10000000;

            let gpsFixType = chrome.i18n.getMessage('gpsFixNone');
            if (GPS_DATA.fix >= 2) {
                gpsFixType = chrome.i18n.getMessage('gpsFix3D');
            } else if (GPS_DATA.fix >= 1) {
                gpsFixType = chrome.i18n.getMessage('gpsFix2D');
            }
            
            $('.GPS_info td.fix').html(gpsFixType);
            $('.GPS_info td.alt').text(GPS_DATA.alt + ' m');
            $('.GPS_info td.lat').text(lat.toFixed(4) + ' deg');
            $('.GPS_info td.lon').text(lon.toFixed(4) + ' deg');
            $('.GPS_info td.speed').text(GPS_DATA.speed + ' cm/s');
            $('.GPS_info td.sats').text(GPS_DATA.numSat);
            $('.GPS_info td.distToHome').text(GPS_DATA.distanceToHome + ' m');

            let gpsRate = 0;
            if (GPS_DATA.messageDt > 0) {
                gpsRate = 1000 / GPS_DATA.messageDt;
            }

            $('.GPS_stat td.messages').text(GPS_DATA.packetCount);
            $('.GPS_stat td.rate').text(gpsRate.toFixed(1) + ' Hz');
            $('.GPS_stat td.errors').text(GPS_DATA.errors);
            $('.GPS_stat td.timeouts').text(GPS_DATA.timeouts);
            $('.GPS_stat td.eph').text((GPS_DATA.eph / 100).toFixed(2) + ' m');
            $('.GPS_stat td.epv').text((GPS_DATA.epv / 100).toFixed(2) + ' m');
            $('.GPS_stat td.hdop').text((GPS_DATA.hdop / 100).toFixed(2));

            //Update map
            if (GPS_DATA.fix >= 2) {

                if (!cursorInitialized) {
                    cursorInitialized = true;

                    iconStyle = new ol.style.Style({
                        image: new ol.style.Icon(({
                            anchor: [0.5, 1],
                            opacity: 1,
                            scale: 0.5,
                            src: '../images/icons/cf_icon_position.png'
                        }))
                    });
            
                    let currentPositionLayer;
                    iconGeometry = new ol.geom.Point(ol.proj.fromLonLat([0, 0]));
                    iconFeature = new ol.Feature({
                        geometry: iconGeometry
                    });
            
                    iconFeature.setStyle(iconStyle);
            
                    let vectorSource = new ol.source.Vector({
                        features: [iconFeature]
                    });
                    currentPositionLayer = new ol.layer.Vector({
                        source: vectorSource
                    });
            
                    mapHandler.addLayer(currentPositionLayer);
                }

                let center = ol.proj.fromLonLat([lon, lat]);
                mapView.setCenter(center);
                mapView.setZoom(14);
                iconGeometry.setCoordinates(center);
            }
        }

        /*
         * enable data pulling
         * GPS is usually refreshed at 5Hz, there is no reason to pull it much more often, really...
         */
        helper.mspBalancedInterval.add('gps_pull', 200, 3, function gps_update() {
            // avoid usage of the GPS commands until a GPS sensor is detected for targets that are compiled without GPS support.
            if (!have_sensor(CONFIG.activeSensors, 'gps')) {
                update_ui();
                return;
            }

            if (helper.mspQueue.shouldDrop()) {
                return;
            }

            get_raw_gps_data();
        });

        GUI.content_ready(callback);
    }

};

TABS.gps.cleanup = function (callback) {
    if (callback) callback();
};