#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#include <Wt/WAbstractTableModel.h>
#pragma GCC diagnostic pop
#include <Wt/WApplication.h>
#include <Wt/WBootstrap5Theme.h>
#include <Wt/WContainerWidget.h>
#include <Wt/WGridLayout.h>
#include <Wt/WHBoxLayout.h>
#include <Wt/WMenuItem.h>
#include <Wt/WPanel.h>
#include <Wt/WPushButton.h>
#include <Wt/WServer.h>
#include <Wt/WTableView.h>
#include <Wt/WTabWidget.h>
#include <Wt/WText.h>
#include <Wt/WVBoxLayout.h>

using namespace std;
using namespace Wt;
using namespace Wt::cpp17;

#define SET_BS5THEME  1

// Always apply theme before creating widgets!
class CThemedApplication : public WApplication
{
public:
    CThemedApplication(const WEnvironment& rcEnv)
    : WApplication{rcEnv}
    {
        #if SET_BS5THEME
            setTheme(make_shared<WBootstrap5Theme>());
        #endif
    }
};

class CFixedTableModel : public WAbstractTableModel
{
public:
    CFixedTableModel(const int rowCount, const int colCount)
    : _rowCount{rowCount}
    , _colCount{colCount}
    { }

    any headerData(const int section, const Orientation orientation, const ItemDataRole role) const
    {
        if (orientation != Orientation::Horizontal)  throw invalid_argument("orientation");
        switch (role.value())
        {
            default:                     return {};
            case ItemDataRole::Display:  return format("C{}", section);
        }
    }

    any data(const WModelIndex& index, const ItemDataRole role) const override
    {
        if (!index.isValid())  return {};
        switch (role.value())
        {
            default:                     return {};
            case ItemDataRole::Display:  return format("{}, {}", index.row(), index.column());
        }
    }

    //! Returns the WModelIndex moved by delta.
    [[nodiscard]]
    WModelIndex move(const WModelIndex& index, int rowDelta, int colDelta) const
    {
      const int row{clamp(index.row()    + rowDelta, 0, _rowCount - 1)};
      const int col{clamp(index.column() + colDelta, 0, _colCount - 1)};
      return createIndex(row, col, nullptr);
    }

    int columnCount(const WModelIndex& index) const override { return index.isValid() ? 0 : _colCount; }
    int rowCount   (const WModelIndex& index) const override { return index.isValid() ? 0 : _rowCount; }

    const int _rowCount;
    const int _colCount;
};

template<typename T, typename... TArgs>
constexpr inline
std::unique_ptr<T> create(std::function<void (T&)>&& fInitialize, TArgs&&... args)
{
  std::unique_ptr<T> Ptr{std::make_unique<T>(std::forward<TArgs>(args)...)};
  fInitialize(*Ptr);
  return Ptr;
}

inline void setAccessKey(WInteractWidget& widget, const char mnemonic) { widget.setAttributeValue("accesskey", string(1, tolower(mnemonic))); }

class CApplication final : public CThemedApplication
{
public:
    CApplication(const WEnvironment& rcEnv);

private:
    WServer& _Server; //!< The associated WServer instance, needed for async operations.

    WContainerWidget& _cntRoot{*root()};
    WBoxLayout& _lytRoot{*_cntRoot.setLayout(make_unique<WVBoxLayout>())};

    WPushButton& _btnP{*_lytRoot.addWidget(create<WPushButton>([this](auto& btnP)
        {
            btnP.clicked().connect([this] { _tvA.setRowHeaderCount(1); });
            btnP.setTextFormat(TextFormat::UnsafeXHTML);
            setAccessKey(btnP, 'F');
        }, "<u>F</u>ix <i>first column</i> of A - by means of 'set<i>RowHeader</i>Count(1)'"))};

    WTabWidget& _tbwMain{*_lytRoot.addWidget(make_unique<WTabWidget>(), /*stretch*/ 100)};
    WMenuItem& _tabConnecting{*_tbwMain.addTab(make_unique<WText>(), "connecting...", ContentLoading::Eager)};
    WMenuItem& _tabA{*_tbwMain.addTab(make_unique<WTableView>(), "A", ContentLoading::Eager)};
    WTableView& _tvA{dynamic_cast<WTableView&>(*_tbwMain.widget(_tbwMain.count() - 1))};
    WMenuItem& _tabB{*_tbwMain.addTab(make_unique<WTableView>(), "B", ContentLoading::Eager)};
    WTableView& _tvB{dynamic_cast<WTableView&>(*_tbwMain.widget(_tbwMain.count() - 1))};

    WPanel& _pnlBottom{*_lytRoot.addWidget(make_unique<WPanel>())};
    WContainerWidget& _cntBottom{*_pnlBottom.setCentralWidget(make_unique<WContainerWidget>())};
    WBoxLayout& _lytBottom{*_cntBottom.setLayout(make_unique<WHBoxLayout>())};

    WPushButton& _btnUp{*_lytBottom.addWidget(create<WPushButton>([this](auto& btnUp)
        {
            btnUp.clicked().connect([this] { _tvA.select(_mdlAPtr->move(*_tvA.selectedIndexes().begin(), -1, 0)); });
            btnUp.setTextFormat(TextFormat::UnsafeXHTML);
            setAccessKey(btnUp, 'U');
        }, "<u>U</u>p A"))};
    WPushButton& _btnDown{*_lytBottom.addWidget(create<WPushButton>([this](auto& btnDown)
        {
            btnDown.clicked().connect([this] { _tvA.select(_mdlAPtr->move(*_tvA.selectedIndexes().begin(), +1, 0)); });
            btnDown.setTextFormat(TextFormat::UnsafeXHTML);
            setAccessKey(btnDown, 'D');
        }, "<u>D</u>own A"))};
    WPushButton& _btnLeft{*_lytBottom.addWidget(create<WPushButton>([this](auto& btnLeft)
        {
            btnLeft.clicked().connect([this] { _tvA.select(_mdlAPtr->move(*_tvA.selectedIndexes().begin(), 0, -1)); });
            btnLeft.setTextFormat(TextFormat::UnsafeXHTML);
            setAccessKey(btnLeft, 'L');
        }, "<u>L</u>eft A"))};
    WPushButton& _btnRight{*_lytBottom.addWidget(create<WPushButton>([this](auto& btnRight)
        {
            btnRight.clicked().connect([this] { _tvA.select(_mdlAPtr->move(*_tvA.selectedIndexes().begin(), 0, +1)); });
            btnRight.setTextFormat(TextFormat::UnsafeXHTML);
            setAccessKey(btnRight, 'R');
        }, "<u>R</u>ight A"))};

    shared_ptr<CFixedTableModel> _mdlAPtr{make_shared<CFixedTableModel>(100,  50)};
    shared_ptr<CFixedTableModel> _mdlBPtr{make_shared<CFixedTableModel>(200, 100)};

    const vector<reference_wrapper<WWidget>> _appWidgets{_tabA, _tabB, _pnlBottom};
};

CApplication::CApplication(const WEnvironment& rcEnv)
: CThemedApplication{rcEnv}
, _Server{*environment().server()}
{
    setTitle("bug repro " WT_VERSION_STR);

    const auto initTable = [this](WTableView& tv, const shared_ptr<CFixedTableModel>& mdlPtr)
        {
            //tv.setRowHeaderCount(1); // causes double scrollbar with 4.12.2
            tv.setSelectionBehavior(SelectionBehavior::Items);
            tv.setSelectionMode(SelectionMode::Single);
            tv.setSortingEnabled(false);
            tv.setCanReceiveFocus(true);
            tv.setEditTriggers(EditTrigger::None);
            tv.setAlternatingRowColors(true);
            tv.setModel(mdlPtr);

            tv.selectionChanged().connect([&tv]
                {
                    const WModelIndexSet selectedIndexes{tv.selectionModel()->selectedIndexes()};
                    switch (selectedIndexes.size())
                    {
                        case 0:  break;
                        case 1:  tv.scrollTo(*selectedIndexes.cbegin()); break;
                        default: throw logic_error("multi-selection unexpected");
                    }
                });

            tv.select(mdlPtr->move(WModelIndex{}, 0, 1));

            tv.keyWentDown().connect([&tv, this](const WKeyEvent& rcKeyEvent)
                {
                    const WModelIndex selected{*tv.selectedIndexes().cbegin()};
                    const CFixedTableModel& model{dynamic_cast<CFixedTableModel&>(*tv.model())};
                    const int ciMax{0x3FFFFFFF};
                    switch (rcKeyEvent.modifiers())
                    {
                        case KeyboardModifier::None:
                            switch (rcKeyEvent.key())
                            {
                                case Key::Up:       return tv.select(model.move(selected,  -1,      0));
                                case Key::Down:     return tv.select(model.move(selected,  +1,      0));
                                case Key::Left:     return tv.select(model.move(selected,   0,     -1));
                                case Key::Right:    return tv.select(model.move(selected,   0,     +1));
                                case Key::Home:     return tv.select(model.move(selected,   0, -ciMax));
                                case Key::End:      return tv.select(model.move(selected,   0, +ciMax));
                                case Key::PageUp:   return tv.select(model.move(selected, -20,      0));
                                case Key::PageDown: return tv.select(model.move(selected, +20,      0));
                                default:            return;
                            }
                        case KeyboardModifier::Control:
                            switch (rcKeyEvent.key())
                            {
                                case Key::Home:     return tv.select(model.move(selected, -ciMax, -ciMax));
                                case Key::End:      return tv.select(model.move(selected, +ciMax, +ciMax));
                                case Key::PageUp:   log("trace") << "Ctrl+PageUp would work in this browser"; return; // caught by browser
                                case Key::PageDown: log("trace") << "Ctrl+PageDn would work in this browser"; return; // caught by browser
                                default:            return;
                            }
                        case KeyboardModifier::Shift:
                            switch (rcKeyEvent.key())
                            {
                                case Key::Home:     return tv.select(model.move(selected,      0, -ciMax));
                                case Key::End:      return tv.select(model.move(selected,      0, +ciMax));
                                case Key::PageUp:   return tv.select(model.move(selected, -ciMax,      0));
                                case Key::PageDown: return tv.select(model.move(selected, +ciMax,      0));
                                default:            return;
                            }
                        default: return;
                    }
                });
        };
    initTable(_tvA, _mdlAPtr);
    initTable(_tvB, _mdlBPtr);
    _tvB.setHeaderHeight(0);
    _tvB.setRowHeaderCount(1);

    _lytBottom.setContentsMargins(0, 0, 0, 0);
    _lytBottom.addStretch(100);

    const auto showAppWidgets{[this](const bool show) { for (WWidget& appWidget : _appWidgets) { appWidget.setHidden(!show); } }};
    showAppWidgets(false);
    _Server.schedule(300ms, sessionId(), [this, showAppWidgets = move(showAppWidgets)]
        {
            showAppWidgets(true);
            _tabConnecting.hide();
            log("trace") << "canReceiveFocus " << _tvA.canReceiveFocus(); // is true (by default)
            _tabA.setFirstFocus(); // Why doesn't this have any effect?!?
            _tvA.setFocus();
            triggerUpdate();
        });

    // final action after creating the UI
    enableUpdates();
}

int main(int argc, char* argv[])
{
    return WRun(argc, argv, [](const WEnvironment& rcEnv)
        {
            try
            {
                return make_unique<CApplication>(rcEnv);
            }
            catch (const std::exception& rcException)
            {
                cerr << "exception " << typeid(remove_cvref<decltype(rcException)>::type).name() << ": " << rcException.what() << endl;

                #if DEBUG
                    exit(-1);
                #endif
                throw;
            }
        });
}