#ifndef SLIDERDELEGATE_H
#define SLIDERDELEGATE_H

#include <QStyledItemDelegate>
#include <QApplication>
#include <QWidget>
#include <QTableView>
#include <QStandardItemModel>
#include <QVBoxLayout>
#include <QHeaderView>

#include <QSlider>
#include <QPainter>

#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QLineEdit>
#include <QSlider>
#include <QCheckBox>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QLabel>
#include <QProxyStyle>
#include <QPainter>
#include <QStyleOptionSlider>
#include <QGraphicsDropShadowEffect>

// Custom Delegate für QSlider in Spalte 3


// Fluent Design Slider Style
class FluentSliderStyle : public QProxyStyle
{
public:

  FluentSliderStyle()
    : QProxyStyle()
  {}

  // Wichtig: Genug Platz für Handle reservieren
  int pixelMetric(PixelMetric metric, const QStyleOption* option = nullptr, const QWidget* widget = nullptr) const override
  {
    switch (metric)
    {
      case PM_SliderThickness:
        return 32;  // Höhe für horizontalen Slider
      case PM_SliderLength:
        return 20;  // Handle-Größe
      case PM_SliderControlThickness:
        return 20;
      case PM_SliderSpaceAvailable:
        if (option)
        {
          if (const QStyleOptionSlider* sliderOpt = qstyleoption_cast<const QStyleOptionSlider*>(option)) {
            if (sliderOpt->orientation == Qt::Horizontal) {
              return sliderOpt->rect.width() - 20;
            } else {
              return sliderOpt->rect.height() - 20;
            }
          }
        }
        return QProxyStyle::pixelMetric(metric, option, widget);

      default:
        return QProxyStyle::pixelMetric(metric, option, widget);
    }
  }

  QRect subControlRect(ComplexControl cc, const QStyleOptionComplex* opt,SubControl sc, const QWidget* widget) const override
  {
    if (cc == CC_Slider) {
      if (const QStyleOptionSlider* slider = qstyleoption_cast<const QStyleOptionSlider*>(opt)) {
        QRect rect = slider->rect;
        int handleSize = 20;

        if (sc == SC_SliderHandle) {
          // Handle Position korrekt berechnen
          if (slider->orientation == Qt::Horizontal) {
            int range = slider->maximum - slider->minimum;
            int pos = slider->sliderPosition - slider->minimum;
            int pixelRange = rect.width() - handleSize;
            int pixelPos = (range != 0) ? (pos * pixelRange) / range : 0;

            return QRect(rect.x() + pixelPos,
                         rect.center().y() - handleSize / 2,
                         handleSize, handleSize);
          } else {
            int range = slider->maximum - slider->minimum;
            int pos = slider->sliderPosition - slider->minimum;
            int pixelRange = rect.height() - handleSize;
            int pixelPos = (range != 0) ? (pos * pixelRange) / range : 0;

            return QRect(rect.center().x() - handleSize / 2,
                         rect.bottom() - pixelPos - handleSize,
                         handleSize, handleSize);
          }
        }
      }
    }
    return QProxyStyle::subControlRect(cc, opt, sc, widget);
  }

  void drawComplexControl(ComplexControl control, const QStyleOptionComplex* option, QPainter* painter, const QWidget* widget) const override
  {
    if (control == CC_Slider)
    {
      if (const QStyleOptionSlider* slider = qstyleoption_cast<const QStyleOptionSlider*>(option)) {
        painter->setRenderHint(QPainter::Antialiasing);

        // Fluent Colors
        QColor accentColor(0, 120, 212);      // #0078D4
        QColor inactiveColor(138, 136, 134);  // #8A8886
        QColor bgColor(255, 255, 255);        // White background

        if (slider->orientation == Qt::Horizontal) {
          drawHorizontalFluentSlider(painter, slider, accentColor, inactiveColor, bgColor);
        } else {
          drawVerticalFluentSlider(painter, slider, accentColor, inactiveColor, bgColor);
        }
        return;
      }
    }
    QProxyStyle::drawComplexControl(control, option, painter, widget);
  }

private:

  void drawHorizontalFluentSlider(QPainter* painter, const QStyleOptionSlider* slider,
                                  const QColor& activeColor, const QColor& inactiveColor,
                                  const QColor& bgColor) const {
    QRect groove = slider->rect;
    QRect handle = subControlRect(CC_Slider, slider, SC_SliderHandle, nullptr);

    int grooveHeight = 4;
    // Track sollte im Widget-Zentrum sein, nicht im groove-Zentrum
    int grooveY = slider->rect.center().y() - grooveHeight / 2;

    // Full background track
    QRect fullTrack(groove.left(), grooveY, groove.width(), grooveHeight);
    painter->setPen(Qt::NoPen);
    painter->setBrush(inactiveColor.lighter(150));
    painter->drawRoundedRect(fullTrack, grooveHeight / 2, grooveHeight / 2);

    // Active track (filled portion)
    int activeWidth = handle.center().x() - groove.left();
    QRect activeTrack(groove.left(), grooveY, activeWidth, grooveHeight);
    painter->setBrush(activeColor);
    painter->drawRoundedRect(activeTrack, grooveHeight / 2, grooveHeight / 2);

    // Handle (Thumb) - Fluent style is more subtle
    int handleSize = 20;
    QRect thumbRect(handle.center().x() - handleSize / 2,
                    handle.center().y() - handleSize / 2,
                    handleSize, handleSize);

    // Hover effect - subtle glow
    if (slider->state & State_MouseOver) {
      painter->setBrush(QColor(activeColor.red(), activeColor.green(),
                               activeColor.blue(), 30));
      int glowSize = 32;
      QRect glow(handle.center().x() - glowSize / 2,
                 handle.center().y() - glowSize / 2,
                 glowSize, glowSize);
      painter->drawEllipse(glow);
    }

    // Thumb
    painter->setBrush(bgColor);
    painter->setPen(QPen(activeColor, 2));
    painter->drawEllipse(thumbRect);

    // Inner circle for pressed state
    if (slider->state & State_Sunken) {
      int innerSize = 8;
      QRect inner(handle.center().x() - innerSize / 2,
                  handle.center().y() - innerSize / 2,
                  innerSize, innerSize);
      painter->setPen(Qt::NoPen);
      painter->setBrush(activeColor);
      painter->drawEllipse(inner);
    }
  }

  void drawVerticalFluentSlider(QPainter* painter, const QStyleOptionSlider* slider,
                                const QColor& activeColor, const QColor& inactiveColor,
                                const QColor& bgColor) const {
    QRect groove = slider->rect;
    QRect handle = subControlRect(CC_Slider, slider, SC_SliderHandle, nullptr);

    int grooveWidth = 4;
    // Track sollte im Widget-Zentrum sein
    int grooveX = slider->rect.center().x() - grooveWidth / 2;

    // Full background track
    QRect fullTrack(grooveX, groove.top(), grooveWidth, groove.height());
    painter->setPen(Qt::NoPen);
    painter->setBrush(inactiveColor.lighter(150));
    painter->drawRoundedRect(fullTrack, grooveWidth / 2, grooveWidth / 2);

    // Active track
    int activeHeight = groove.bottom() - handle.center().y();
    QRect activeTrack(grooveX, handle.center().y(), grooveWidth, activeHeight);
    painter->setBrush(activeColor);
    painter->drawRoundedRect(activeTrack, grooveWidth / 2, grooveWidth / 2);

    // Handle
    int handleSize = 20;
    QRect thumbRect(handle.center().x() - handleSize / 2,
                    handle.center().y() - handleSize / 2,
                    handleSize, handleSize);

    if (slider->state & State_MouseOver) {
      painter->setBrush(QColor(activeColor.red(), activeColor.green(),
                               activeColor.blue(), 30));
      int glowSize = 32;
      QRect glow(handle.center().x() - glowSize / 2,
                 handle.center().y() - glowSize / 2,
                 glowSize, glowSize);
      painter->drawEllipse(glow);
    }

    painter->setBrush(bgColor);
    painter->setPen(QPen(activeColor, 2));
    painter->drawEllipse(thumbRect);

    if (slider->state & State_Sunken) {
      int innerSize = 8;
      QRect inner(handle.center().x() - innerSize / 2,
                  handle.center().y() - innerSize / 2,
                  innerSize, innerSize);
      painter->setPen(Qt::NoPen);
      painter->setBrush(activeColor);
      painter->drawEllipse(inner);
    }
  }
};

class SliderDelegate : public QStyledItemDelegate
{
  Q_OBJECT

public:
  SliderDelegate(QObject* parent = nullptr)
    : QStyledItemDelegate(parent)
  {}

  // Editor erstellen (QSlider)
  QWidget* createEditor(QWidget* parent, const QStyleOptionViewItem& option,const QModelIndex& index) const override
  {
    Q_UNUSED(option)
    Q_UNUSED(index)

    auto* slider = new QSlider(Qt::Horizontal, parent);
    slider->setRange(0, 100);
    slider->setSingleStep(1);
    slider->setPageStep(10);
slider->setStyle(new FluentSliderStyle());
    // Signal für sofortige Updates
    connect(slider, &QSlider::valueChanged, this, [this, slider]() {
      // Commit data sofort bei Änderung
      emit const_cast<SliderDelegate*>(this)->commitData(slider);
    });

    return slider;
  }

  // Editor mit aktuellem Wert füllen
  void setEditorData(QWidget* editor, const QModelIndex& index) const override {
    int value = index.model()->data(index, Qt::EditRole).toInt();
    auto* slider = static_cast<QSlider*>(editor);
    slider->setValue(value);
  }

  // Wert vom Editor ins Model schreiben
  void setModelData(QWidget* editor, QAbstractItemModel* model,
                    const QModelIndex& index) const override {
    auto* slider = static_cast<QSlider*>(editor);
    int value = slider->value();
    model->setData(index, value, Qt::EditRole);
  }

  // Editor-Geometrie (wichtig für korrekte Positionierung)
  void updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option,
                            const QModelIndex& index) const override {
    Q_UNUSED(index)
    /*
    QRect barRect = option.rect.adjusted(option.rect.width() - 55,
                                         option.rect.height() / 2 - 2,
                                         -8,
                                      -option.rect.height() / 2 + 2);
 */
    QRect sliderRect = option.rect.adjusted(
      option.rect.width() - 115,  // Von rechts: 115px (Breite der Progress Bar)
      0,                          // Oben: kein Offset
      -8,                         // Rechts: 8px Padding
      0                           // Unten: kein Offset
      );
    editor->setGeometry(sliderRect);  // Slider nur über Progress Bar
    //editor->setGeometry(option.rect);
  }

  // Anzeige wenn NICHT editiert wird
  void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override
  {

    if (index.column() == 1)
    {  // Nur für Wert-Spalte
      // Wert holen
      int value = index.model()->data(index, Qt::DisplayRole).toInt();

      // Hintergrund
      if (option.state & QStyle::State_Selected) {
        painter->fillRect(option.rect, option.palette.highlight());
      } else if (index.row() % 2 == 1) {
        painter->fillRect(option.rect, QColor(0xFAFAFA));
      } else {
        painter->fillRect(option.rect, Qt::white);
      }

      // Text und kleiner Slider-Indikator zeichnen
      painter->save();
      painter->setRenderHint(QPainter::Antialiasing);

      QRect textRect = option.rect.adjusted(8, 0, -120, 0);
      QRect barRect = option.rect.adjusted(option.rect.width() - 115,
                                           option.rect.height() / 2 - 2,
                                           -8,
                                           -option.rect.height() / 2 + 2);

      // Text
      painter->setPen(option.state & QStyle::State_Selected ?
                        option.palette.highlightedText().color() : Qt::black);
      painter->drawText(textRect, Qt::AlignVCenter | Qt::AlignLeft,
                        QString::number(value));

      // Mini Progress Bar
      painter->setPen(Qt::NoPen);
      painter->setBrush(QColor(0xE0E0E0));
      painter->drawRoundedRect(barRect, 2, 2);

      QRect fillRect = barRect;
      fillRect.setWidth(barRect.width() * value / 100);
      painter->setBrush(QColor(0x0078D4));
      painter->drawRoundedRect(fillRect, 2, 2);

      painter->restore();
    } else {
      // Standard-Zeichnung für andere Spalten
      QStyledItemDelegate::paint(painter, option, index);
    }
  }
};

#endif // SLIDERDELEGATE_H