#include <Wt/WApplication.h>
#include <Wt/WContainerWidget.h>
#include <Wt/WEnvironment.h>
#include <Wt/WStandardItemModel.h>
#include <Wt/WText.h>
#include <Wt/WVBoxLayout.h>
#include <Wt/Chart/WPieChart.h>

using namespace Wt;

#define HAPPY_RESIZING

class myApplication : public WApplication
{
public:
  myApplication(const WEnvironment &env) : WApplication(env)
  {
    std::unique_ptr<WVBoxLayout> upBoxLayout = std::make_unique<WVBoxLayout>();
    upBoxLayout->setPreferredImplementation(Wt::LayoutImplementation::JavaScript);

#ifdef HAPPY_RESIZING
    upBoxLayout->addWidget(myPieChart());
#else
    std::unique_ptr<Wt::WContainerWidget> upContainerPieChart = std::make_unique<Wt::WContainerWidget>();
    Wt::Chart::WPieChart *chart = upContainerPieChart->addWidget(myPieChart());
    chart->resize(800, 300);
    upBoxLayout->addWidget(std::move(upContainerPieChart));
#endif

    std::unique_ptr<Wt::WContainerWidget> upContainer = std::make_unique<Wt::WContainerWidget>();
    upContainer->addWidget(std::make_unique<Wt::WText>(""));
    upBoxLayout->addWidget(std::move(upContainer), 1);
    upBoxLayout->setResizable(0);

    root()->setLayout(std::move(upBoxLayout));
  }

private:

  std::unique_ptr<Wt::Chart::WPieChart> myPieChart()
  {
    auto upModel = std::make_shared<Wt::WStandardItemModel>();

    upModel->insertColumns(upModel->columnCount(), 2);
    upModel->insertRows(upModel->rowCount(), 6);

    int row = 0;
    upModel->setData(row, 0, Wt::WString("Blueberry"));
    upModel->setData(row, 1, 120);
    upModel->setData(++row, 0, Wt::WString("Cherry"));
    upModel->setData(row, 1, 30);

    std::unique_ptr<Wt::Chart::WPieChart> upPieChart = std::make_unique<Wt::Chart::WPieChart>();

#ifdef HAPPY_RESIZING
    upPieChart->resize(Wt::WLength(), 300);
#else
    upPieChart->resize(800, 300);
#endif

    upPieChart->setModel(upModel);
    upPieChart->setLabelsColumn(0);
    upPieChart->setDataColumn(1);
    upPieChart->setPerspectiveEnabled(true, 0.2);
    upPieChart->setShadowEnabled(true);
    upPieChart->setExplode(0, 0.3);

    upPieChart->setDisplayLabels(Wt::Chart::LabelOption::Outside |
      Wt::Chart::LabelOption::TextLabel |
      Wt::Chart::LabelOption::TextPercentage);

    upPieChart->setMargin(10,
      Wt::Side::Bottom);

    upPieChart->setMargin(Wt::WLength::Auto,
      Wt::Side::Left |
      Wt::Side::Right);

    return std::move(upPieChart);
  };

};

  std::unique_ptr<WApplication> createMyApplication(const WEnvironment& env)
  {
    auto app = cpp14::make_unique<myApplication>(env);
    return std::move(app);
  }

  int main(int argc, char **argv)
  {
    return WRun(argc, argv, &createMyApplication);
  }