let allAccSerial = []
let allSerialCoords = []

var ctx = document.getElementById('accChart').getContext('2d');
var accChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: [],
        datasets: [{
            label: 'Ublox Horizontal acc. (m)',
            backgroundColor: 'rgba(255, 255, 255, 1)',
            borderColor: 'rgba(255, 255, 255, 1)',
            borderWidth: 1,
            fill: false,
            pointRadius: 0.5,
            lineTension: 0.5,
            data: []
        },
        {
            label: 'Distance Ublox - Smartphone (m)',
            backgroundColor: 'rgba(30, 130, 76, 1)',
            borderColor: 'rgba(30, 130, 76, 1)',
            borderWidth: 1,
            fill: false,
            pointRadius: 0.5,
            lineTension: 0.5,
            data: []
        }]
    },
    options: {
        scales: {
            yAxes: [{
                ticks: {
                    min: 0,
                    max: 20,
                }
            }],
            xAxes: [{
                type: 'time',
                time: {
                    unit: 'second'
                }
            }]
        },
        animation: {
            duration: 0
        }
    }
});

function addDistances(tcpDataList, serialDataList){
    let tcpCoords = []
    let serialCoords = []

    let tcpTimes = []
    let serialHAccs = []
    let distances = []

    indexes.forEach(index => {
        serialHAccs.push(allAccSerial[index].toFixed(2))
        serialCoords.push(allSerialCoords[index])
    })

    tcpDataList.forEach(sensordata => {
        if(!(sensordata.Speed === 0) && !(sensordata.HAcc === 0)){
            if (!(sensordata.Position[0] === 0) && !(sensordata.Position[1] === 0)) {
                let tcpCoord = [sensordata.Position[1], sensordata.Position[0]]
                tcpCoords.push(tcpCoord)
                let time = sensordata.Timestamp
                tcpTimes.push(time)
            }
        }
    })

    for(let i = 0; i < tcpCoords.length; i++){
        let distance = distanceInMetersBetweenEarthCoordinates
            (serialCoords[i][0],serialCoords[i][1],tcpCoords[i][0],tcpCoords[i][1])
        distances.push(distance)
    }

    accChart.data.labels = tcpTimes
    accChart.data.datasets[0].data = serialHAccs
    accChart.data.datasets[1].data = distances
    accChart.update()
}

//https://www.movable-type.co.uk/scripts/latlong.html
function distanceInMetersBetweenEarthCoordinates(long1, lat1, long2, lat2) {
    var earthRadiusM = 6371000

    var phi1 = lat1 * Math.PI / 180
    var phi2 = lat2 * Math.PI / 180

    var dlat = (lat2-lat1) * Math.PI / 180
    var dlong = (long2 - long1) * Math.PI / 180

    var a = Math.sin(dlat/2) * Math.sin(dlat/2) +
            Math.cos(phi1) * Math.cos(phi2) *
            Math.sin(dlong/2) * Math.sin(dlong/2)
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a))
    return earthRadiusM * c
}