function getThemeChartColors() {
    return [
        {
            themeName: 'dark-theme',
            machineStatus: {
                datasets: [
                    {
                        backgroundColor: '#34495e' // Running
                    },
                    {
                        backgroundColor: '#34495e' // Wait
                    },
                    {
                        backgroundColor: '#34495e' // Error
                    },
                    {
                        backgroundColor: '#34495e' // Unknown
                    },
                    {
                        backgroundColor: '#34495e' // Disconnected
                    }
                ]
            },
            lineUtilization: {
                pointBackgroundColor: '#34495e'
            }
        },
        {
            themeName: 'blue-theme',
            machineStatus: {
                datasets: [
                    {
                        backgroundColor: '#2980b9' // Running
                    },
                    {
                        backgroundColor: '#2980b9' // Wait
                    },
                    {
                        backgroundColor: '#2980b9' // Error
                    },
                    {
                        backgroundColor: '#2980b9' // Unknown
                    },
                    {
                        backgroundColor: '#2980b9' // Disconnected
                    }
                ]
            },
            lineUtilization: {
                pointBackgroundColor: '#2980b9'
            }
        }
    ];
}

function changeTheme(themeName) {
    var themeList = getThemeChartColors();

    var theme = themeList.find(x => x.themeName === themeName);

    for (var i = 0; i < theme.machineStatus.datasets.length; ++i) {
        _widgetMachineStatus.data.datasets[i].backgroundColor = theme.machineStatus.datasets[i].backgroundColor;
    }

    _widgetMachineStatus.update();

    _widgetLineUtilization.data.datasets[0].pointBackgroundColor = theme.lineUtilization.pointBackgroundColor;
    _widgetLineUtilization.update();
}