#include <QPainter>
#include <QPropertyAnimation>
#include <QEasingCurve>
#include <QEnterEvent>
#include <QEvent>

#include <bctoggleswitch.h>

BCToggleSwitch::BCToggleSwitch(QWidget *parent)
  : QAbstractButton(parent)
  , m_position(0.0f)
{
  setCheckable(true);
  setCursor(Qt::PointingHandCursor);
  setFixedSize(44, 22); // Standardgröße

  // Animation initialisieren
  m_animation = new QPropertyAnimation(this, "position", this);
  m_animation->setDuration(200);
  m_animation->setEasingCurve(QEasingCurve::OutQuad);

  // Signal verknüpfen
  connect(this, &QAbstractButton::toggled, this, [this](bool checked){
    m_animation->stop();
    m_animation->setStartValue(m_position);
    m_animation->setEndValue(checked ? 1.0f : 0.0f);
    m_animation->start();
  });
}

float BCToggleSwitch::position() const
{
  return m_position;
}

void BCToggleSwitch::setPosition(float pos) {
  m_position = pos;
  update(); // Trigger Repaint
}

QSize BCToggleSwitch::sizeHint() const
{
  return QSize(44, 22);
}

void BCToggleSwitch::paintEvent(QPaintEvent *)
{
  QPainter p(this);
  p.setRenderHint(QPainter::Antialiasing);

  // --- Farben ---
  // Tipp: In einem echten Projekt diese Farben als const statics
  // oder aus der QPalette laden.
  QColor offBorderColor = QColor("#8D8D8D");
  QColor offKnobColor   = QColor("#5D5D5D");
  QColor onColor        = QColor("#0078D4"); // Fluent Blue
  QColor white          = Qt::white;

  QRectF rect = this->rect();
  qreal radius = rect.height() / 2.0;

  // 1. Hintergrund (Track) zeichnen
  p.setPen(Qt::NoPen);

  if (isChecked() || m_position > 0.5f)
  {
    // AN-Zustand: Hintergrund gefüllt
    p.setBrush(onColor);
    p.drawRoundedRect(rect, radius, radius);
  }
  else
  {
    // AUS-Zustand: Nur Rahmen
    p.setBrush(Qt::NoBrush);

    // Hover-Status prüfen
    if (underMouse())
      p.setPen(QPen(offBorderColor.darker(120), 1.5));
    else
      p.setPen(QPen(offBorderColor, 1.5));

    // Rechteck etwas verkleinern, damit der Rahmen nicht abgeschnitten wird
    p.drawRoundedRect(rect.adjusted(1, 1, -1, -1), radius - 1, radius - 1);
  }

  // 2. Knopf (Thumb) zeichnen
  qreal padding = 3.0;
  qreal knobDiameter = rect.height() - (2 * padding);

  // Interpolation der Position
  qreal startX = padding;
  qreal endX = rect.width() - knobDiameter - padding;
  qreal currentX = startX + (m_position * (endX - startX));

  QRectF knobRect(currentX, padding, knobDiameter, knobDiameter);

  if (isChecked() || m_position > 0.5f) {
    p.setBrush(white);
  } else {
    if (underMouse()) p.setBrush(offKnobColor.darker(110));
    else              p.setBrush(offKnobColor);
  }

  p.setPen(Qt::NoPen);
  p.drawEllipse(knobRect);
}

void BCToggleSwitch::enterEvent(QEnterEvent *event)
{
  update(); // Für Hover-Effekt neu zeichnen
  QAbstractButton::enterEvent(event);
}

void BCToggleSwitch::leaveEvent(QEvent *event)
{
  update(); // Hover entfernen
  QAbstractButton::leaveEvent(event);
}