let allAccSerial = []
let allSerialCoords = []
let allTcpCoords = []

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][1],serialCoords[i][0],tcpCoords[i][1],tcpCoords[i][0])
        distances.push(distance)
    }

    console.log("distances: " + distances)

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

function degreesToRadians(degrees) {
    return degrees * Math.PI / 180;
}

function distanceInMetersBetweenEarthCoordinates(lat1, lon1, lat2, lon2) {
    var earthRadiusKm = 6371

    var dLat = degreesToRadians(lat2-lat1)
    var dLon = degreesToRadians(lon2-lon1)

    lat1 = degreesToRadians(lat1)
    lat2 = degreesToRadians(lat2)

    var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
        Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2)
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a))
    return (earthRadiusKm * c) * 1000
}