/***************************************************************************

  BionxControl
  © 2025 -2026 christoph holzheuer
  christoph.holzheuer@gmail.com

  Using:

  mhs_can_drv.c
  © 2011 - 2023 by MHS-Elektronik GmbH & Co. KG, Germany
  Klaus Demlehner, klaus@mhs-elektronik.de
  @see www.mhs-elektronik.de

  Based on Bionx data type descriptions from:

  BigXionFlasher USB V 0.2.4 rev. 97
  © 2011-2013 by Thomas Koenig <info@bigxionflasher.org>
  @see www.bigxionflasher.org

  Bionx Bike Info
  © 2018 Thorsten Schmidt (tschmidt@ts-soft.de)
  @see www.ts-soft.de

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 3 of the License, or
  (at your option) any later version.
  @see https://github.com/bikemike/bionx-bikeinfo

 ***************************************************************************/


#ifndef BCSLIDERSTYLE_H
#define BCSLIDERSTYLE_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>

// 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);
    }
  }
};


#endif // BCSLIDERSTYLE_H