#include <QSlider>
#include <QLabel>
#include <QHBoxLayout>
#include <QWidget>
#include <QDebug>
#include <QPainter>
#include <QTimer>
#include <QListView>

#include <QVariantAnimation>
#include <QPropertyAnimation>
#include <QPainter>

#include "bcitemdelegate.h"
#include "bcdataitem.h"
#include "qapplication.h"



BCItemDelegate::BCItemDelegate(QListView *view)
  : QStyledItemDelegate(view), _view{view}
{

}


QString BCItemDelegate::displayText(const QVariant& dataValue, const QLocale& locale) const
{
  // Wir prüfen, ob im Variant unser Struct steckt
  if (dataValue.canConvert<BCDataItem*>())
  {
    BCDataItem& bc = *dataValue.value<BCDataItem*>();
    qDebug() << " --- YES: " << bc.label;
    // Hier bauen wir den String zusammen, den man sieht,
    // wenn KEIN Editor offen ist.
    // Format: "Label: Wert Einheit"
    return QString("%1: %2 %3").arg(bc.label, bc.value.toString(), "mmX");
  }
  else
  {
    //qDebug() << " --- Nö!";
  }

  // Fallback für normale Strings/Zahlen
  return QStyledItemDelegate::displayText(dataValue, locale);
}


QWidget *BCItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex& index) const
{
  QVariant rawData = index.data(Qt::EditRole);
  if (!rawData.canConvert<BCDataItem*>())
    return QStyledItemDelegate::createEditor(parent, option, index);

  const BCDataItem& bc = *rawData.value<BCDataItem*>();

  // Nur bei Integern den Slider-Editor bauen
  if (bc.value.typeId() == QMetaType::Int)
  {
    QWidget *container = new QWidget(parent);
    container->setAutoFillBackground(true);

    QHBoxLayout *layout = new QHBoxLayout(container);
    layout->setContentsMargins(4, 0, 4, 0);
    layout->setSpacing(10);

    // Linkes Label (Name)
    QLabel *lblName = new QLabel(bc.label, container);
    lblName->setFixedWidth(80);

    // Slider
    QSlider *slider = new QSlider(Qt::Horizontal, container);
    slider->setRange(0, 100);
    slider->setObjectName("slider");

    // Rechtes Label (Vorschau Wert + Einheit)
    QLabel *lblUnit = new QLabel(container);
    lblUnit->setFixedWidth(60);
    lblUnit->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
    lblUnit->setObjectName("lblUnit");

    layout->addWidget(lblName);
    layout->addWidget(slider);
    layout->addWidget(lblUnit);

    // Live-Update des Labels im Editor (aber noch kein Speichern im Model)
    connect(slider, &QSlider::valueChanged, this, [=](int val){
      lblUnit->setText(QString("%1 %2").arg(val).arg("mm2"));
    });

    return container;
  }

  return QStyledItemDelegate::createEditor(parent, option, index);
}

void BCItemDelegate::setEditorData(QWidget *editor, const QModelIndex& index) const
{
  // Daten vom Model in den Editor laden
  const BCDataItem& bc = *index.data(Qt::EditRole).value<BCDataItem*>();

  QSlider *slider = editor->findChild<QSlider*>("slider");
  QLabel *lblUnit = editor->findChild<QLabel*>("lblUnit");

  if (slider && lblUnit) {
    bool olDriverState = slider->blockSignals(true);
    slider->setValue(bc.value.toInt());
    slider->blockSignals(olDriverState);

    lblUnit->setText(QString("%1 %2").arg(bc.value.toInt()).arg( "mm3"));
  } else {
    QStyledItemDelegate::setEditorData(editor, index);
  }
}

void BCItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex& index) const
{
  // Daten vom Editor zurück ins Model speichern (Beim Schließen)
  QSlider *slider = editor->findChild<QSlider*>("slider");

  if (slider) {
    int value = slider->value();
    model->setData(index, value, Qt::EditRole);
  } else {
    QStyledItemDelegate::setModelData(editor, model, index);
  }
}

void BCItemDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex& index) const
{
  editor->setGeometry(option.rect);
}

QSize BCItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex& index) const
{
  return QStyledItemDelegate::sizeHint(option,index);
  /*
  QStyleOptionViewItem opt = option;
  initStyleOption(&opt, index);
  opt.text = formatDisplayString(index);

  QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
  return style->sizeFromContents(QStyle::CT_ItemViewItem, &opt, QSize(), opt.widget);
  */
}


void BCItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
  /*
  // 1. Standard-Zeichnen (Text, Hintergrund, Selection) durchführen
  QStyledItemDelegate::paint(painter, option, index);

  // 2. Unser Custom-Overly: Oranger Rahmen, wenn Zeile passt
  if (index.row() == _highlightedRow)
  {
    painter->save();

    qDebug() << " --- is highlight: " << index.row();

    // Setup Stift
    QPen pen(QColor(255, 165, 0)); // Orange
    pen.setWidth(2);
    painter->setPen(pen);

    // Rechteck zeichnen (leicht eingezogen, damit es nicht abgeschnitten wird)
    QRect rect = option.rect.adjusted(1, 1, -1, -1);
    painter->drawRect(rect);

    painter->restore();
  }
  */

  QStyledItemDelegate::paint(painter, option, index);

  /*
  if (index.row() == _highlightedRow && _opacity > 0.0)
  {
    painter->save();

    qDebug() << " --- is highlight: " << index.row();

    QColor highlightColor( 0xFF9800 );
    highlightColor.setAlphaF(_opacity);

    QPen pen(highlightColor, 3);
    painter->setPen(pen);
    painter->setBrush(Qt::NoBrush);
    painter->drawRoundedRect(option.rect.adjusted(2, 2, -2, -2), 8, 8);

    painter->restore();
  }

*/

  int row = index.row();

  if (m_rowOpacities.contains(row))
  {
    /*
    qreal opacity = m_rowOpacities.value(row);
    if (opacity > 0.01)
    {
      painter->save();
      painter->setOpacity(opacity);
      painter->fillRect(option.rect, QColor(255, 140, 0, 120));
      painter->restore();
    }
    */
    paintHighlightRow(painter,option,index);
  }

}

void BCItemDelegate::paintHighlightRow(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
  painter->save();
  painter->setRenderHint(QPainter::Antialiasing);

  int row = index.row();
  qreal opacity = m_rowOpacities.value(row);
  painter->setOpacity(opacity);
  // Margin von 4px
  QRect itemRect = option.rect.adjusted(4, 4, -4, -4);

  // Border von 2px berücksichtigen (nach innen)
  QRect contentRect = itemRect.adjusted(2, 2, -2, -2);

  // Hintergrund (weiß)
  painter->setBrush(Qt::white);
  painter->setPen(Qt::NoPen);
  painter->drawRoundedRect(itemRect, 8, 8);

  // Border (2px solid #2196F3)
  QPen borderPen( Qt::red, 2);
  painter->setPen(borderPen);
  painter->setBrush(Qt::NoBrush);
  painter->drawRoundedRect(itemRect, 8, 8);

  // Padding von 8px für den Content
  QRect textRect = contentRect.adjusted(8, 8, -8, -8);

  // Text zeichnen
  painter->setPen(Qt::black); // oder option.palette.color(QPalette::Text)
  QString text = index.data(Qt::DisplayRole).toString();
  painter->drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, text);

  painter->restore();
}


void BCItemDelegate::onHighlightRow(int row)
{
  qDebug() << " --- should highlight: " << row;

  // Alte Animation für diese Zeile stoppen falls vorhanden
  if (m_rowAnimations.contains(row))
  {
    m_rowAnimations[row]->stop();
    m_rowAnimations[row]->deleteLater();
  }

  // QVariantAnimation ist flexibler als QPropertyAnimation
  auto* anim = new QVariantAnimation(this);
  anim->setDuration(800);
  anim->setStartValue(0.0);
  anim->setEndValue(1.0);

  // Custom Easing für Fade-in/out Effekt
  anim->setEasingCurve(QEasingCurve::OutQuad);

  connect(anim, &QVariantAnimation::valueChanged, this, [this, row](const QVariant& value)
  {
    qreal progress = value.toReal();
    qreal opacity;

    // Schnelles Fade-in (20%), langsames Fade-out (80%)
    if (progress < 0.2) {
      opacity = progress * 5.0; // 0->1 in 20%
    } else {
      opacity = 1.0 - ((progress - 0.2) / 0.8); // 1->0 in 80%
    }

    m_rowOpacities[row] = opacity;
    updateRow(row);
  });

  connect(anim, &QVariantAnimation::finished, this, [this, row, anim]()
  {
    m_rowOpacities.remove(row);
    m_rowAnimations.remove(row);
    updateRow(row);
    anim->deleteLater();
  });

  m_rowAnimations[row] = anim;
  anim->start(QAbstractAnimation::DeleteWhenStopped);
}

// Optional: alle Highlights sofort clearen
void BCItemDelegate::clearAllHighlights()
{
  for(auto* anim : std::as_const(m_rowAnimations))
  {
    anim->stop();
    anim->deleteLater();
  }
  m_rowAnimations.clear();
  m_rowOpacities.clear();

  if (_view)
  {
    _view->viewport()->update();
  }
}

void BCItemDelegate::updateRow(int row)
{
  if (_view && _view->model() && row >= 0)
  {
    QModelIndex idx = _view->model()->index(row, 0);
    QRect rect = _view->visualRect(idx);
    if (!rect.isEmpty()) {
      _view->viewport()->update(rect);
    }
  }
}

QString BCItemDelegate::formatDisplayString(const QModelIndex& index) const
{
  if (!index.isValid())
    return QString();

  QString displayStr;

  /*
  QString label = index.data(BCDataListModel::LabelRole).toString();
  QVariant value = index.data(BCDataListModel::ValueRole);
  QString unit = index.data(BCDataListModel::UnitRole).toString();

  QString valueStr = value.toString();

  // Formatierung für Zahlen
  bool ok;
  double numValue = value.toDouble(&ok);
  if (ok) {
    valueStr = QString::number(numValue, 'f', 2);
  }

  // Zusammensetzen des Anzeige-Strings
  QString displayStr = label;
  if (!displayStr.isEmpty() && !valueStr.isEmpty())
    displayStr += ": ";
  displayStr += valueStr;
  if (!unit.isEmpty())
    displayStr += " " + unit;
  */

  return displayStr;
}