/**
 * This file defines an horizontal bar chart used in the live tracking page, showing Ublox horizontal accuracy,
 * smartphone horizontal accuracy and distance between the positions of the Ublox
 * and the Smartphone at a same time in meters.
 *
 * @authors Timo Volkmann, Frank Herkommer.
 */

//Defines the chart and its properties.
let ctx = document.getElementById("accuracy").getContext('2d');
let barChart = new Chart(ctx, {
    type: 'horizontalBar',
    data: {
        labels: ["Meters"],
        datasets: [{
            label: 'Ublox H. acc.',
            data: [0, 0],
            backgroundColor: "rgba(214, 69, 65, 1)"
        }, {
            label: 'Smartphone H. acc.',
            data: [0, 0],
            backgroundColor: "rgba(30, 139, 195, 1)"
        }, {
            label: 'Dist. Ublox-Smartphone',
            data: [0],
            backgroundColor: "rgba(30, 139, 0, 1)"
        }]
    },
    options: {
        scales: {
            xAxes: [{
                ticks: {
                    min: 0,
                    max: 10
                }
            }]
        },
        legend: {
            display: true,
            enabled: true
        },
        tooltips: {
            enabled: false,
            display: false
        }
    }
});

/**
 * Function to add the Horizontal and Vertical accuracy sent by the Ublox to the chart.
 * Called every time a message is received over serial connection from the server.
 * @param hacc  horizontal accuracy in meters.
 * @param vacc  vertical accuracy in meters
 */
function addSerialAccuracy(hacc, vacc){
    barChart.data.datasets[0].data = [hacc, vacc];
    barChart.update();
}

/**
 * Function to add the Horizontal and Vertical accuracy sent by the Smartphone to the chart.
 * Called every time a message is received over tcp connection from the server.
 * @param hacc  horizontal accuracy in meters.
 * @param vacc  vertical accuracy in meters
 */
function addTCPAccuracy(hacc, vacc){
    barChart.data.datasets[1].data = [hacc, vacc];
    barChart.update();
}

/**
 * Function to add the calculated distance between coordinates sent by the Ublox and the coordinates
 * sent by the smartphone to the chart.
 * @param dist  distance calculated in meters.
 */
function addDistanceToBarChart(dist){
    barChart.data.datasets[2].data = [dist];
    barChart.update();
}