#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QLabel>
#include <QPushButton>
#include <QLineEdit>
#include <QProgressBar>
#include <QPalette>
#include <QFontDatabase>

// Hilfsfunktion: Setzt die Fluent LIGHT Palette global
void applyFluentLightTheme(QApplication &app) {
  // 1. Schriftart setzen
  QFont font = app.font();
  font.setFamily("Segoe UI Variable Display");
  if (!QFontDatabase().families().contains("Segoe UI Variable Display")) {
    font.setFamily("Segoe UI");
  }
  font.setPointSize(10);
  app.setFont(font);

  // 2. Die Palette definieren (Light Mode)
  QPalette p;
  // Window / Background: #F3F3F3 (Mica Alt)
  QColor colBackground("#F3F3F3");
  // Surface / Container: #FFFFFF (Solid White)
  QColor colSurface("#FFFFFF");
  // Accent: #0078D4 (System Accent Default)
  QColor colAccent("#0078D4");
  // Text: Black / Dark Gray
  QColor colText("#1A1A1A"); // Fast Schwarz für weicheren Kontrast
  QColor colSubText("#5D5D5D");

  p.setColor(QPalette::Window, colBackground);
  p.setColor(QPalette::WindowText, colText);
  p.setColor(QPalette::Base, colSurface);
  p.setColor(QPalette::AlternateBase, colBackground);
  p.setColor(QPalette::ToolTipBase, colSurface);
  p.setColor(QPalette::ToolTipText, colText);
  p.setColor(QPalette::Text, colText);
  p.setColor(QPalette::Button, colSurface);
  p.setColor(QPalette::ButtonText, colText);
  p.setColor(QPalette::PlaceholderText, colSubText);
  p.setColor(QPalette::Highlight, colAccent);
  p.setColor(QPalette::HighlightedText, Qt::white); // Weißer Text auf Blau

  app.setPalette(p);

  // 3. Stylesheets für die Details
  app.setStyleSheet(R"(
        QWidget {
            background-color: #F3F3F3;
            color: #1A1A1A;
        }

        /* CARD / CONTAINER STYLE */
        QFrame#Card {
            background-color: #FFFFFF;
            border: 1px solid #E5E5E5; /* Subtiler Rand zur Abgrenzung */
            border-radius: 8px;
            /* Optional: Qt unterstützt simple Schatten, aber auf Pi teuer.
               Der Border reicht hier. */
        }

        /* BUTTONS */
        QPushButton {
            background-color: #FFFFFF;
            border: 1px solid #D1D1D1;
            border-bottom: 1px solid #B0B0B0; /* Tiefe simulieren */
            border-radius: 4px;
            padding: 6px 12px;
            color: #1A1A1A;
        }
        QPushButton:hover {
            background-color: #FBFBFB;
            border: 1px solid #C0C0C0;
        }
        QPushButton:pressed {
            background-color: #F0F0F0;
            color: #5D5D5D;
            border-bottom: 1px solid #D1D1D1; /* Flach drücken */
        }

        /* Accent Button (Primary) */
        QPushButton#PrimaryButton {
            background-color: #0078D4;
            color: #FFFFFF;
            border: 1px solid #0078D4;
        }
        QPushButton#PrimaryButton:hover {
            background-color: #1084D9;
        }
        QPushButton#PrimaryButton:pressed {
            background-color: #006CC1;
            border-color: #006CC1;
        }

        /* INPUT FIELDS */
        QLineEdit {
            background-color: #FFFFFF;
            border: 1px solid #D1D1D1;
            border-bottom: 2px solid #8A8A8A; /* Stärkerer Indikator */
            border-radius: 4px;
            padding: 5px;
            selection-background-color: #0078D4;
            selection-color: #FFFFFF;
        }
        QLineEdit:hover {
            background-color: #FDFDFD;
        }
        QLineEdit:focus {
            background-color: #FFFFFF;
            border-bottom: 2px solid #0078D4; /* Active highlight */
        }

        /* LABELS */
        QLabel#Title {
            font-size: 18pt;
            font-weight: bold;
            color: #000000;
        }
        QLabel#Subtitle {
            font-size: 10pt;
            color: #5D5D5D;
        }

        /* PROGRESS BAR */
        QProgressBar {
            border: none;
            background-color: #E0E0E0; /* Track Color */
            border-radius: 2px;
            height: 4px;
            text-align: center;
        }
        QProgressBar::chunk {
            background-color: #0078D4; /* Accent Color */
            border-radius: 2px;
        }
    )");
}

// Eine "Card" Komponente (Identisch zum Dark Mode)
class FluentCard : public QFrame {
public:
  FluentCard(const QString &title, const QString &value) {
    setObjectName("Card");
    QVBoxLayout *layout = new QVBoxLayout(this);

    QLabel *lblTitle = new QLabel(title);
    lblTitle->setObjectName("Subtitle");

    QLabel *lblValue = new QLabel(value);
    lblValue->setStyleSheet("font-size: 24pt; font-weight: 300; background: transparent;");
    // Wichtig: background transparent erzwingen, sonst erben Labels manchmal falsche Farbe

    layout->addWidget(lblTitle);
    layout->addWidget(lblValue);
    layout->addStretch();
  }
};

int main(int argc, char *argv[]) {
  QApplication app(argc, argv);

  // HIER: Light Theme anwenden
  applyFluentLightTheme(app);

  QWidget window;
  window.setWindowTitle("Fluent Light Mode Demo");
  window.resize(800, 500);

  QVBoxLayout *mainLayout = new QVBoxLayout(&window);
  mainLayout->setContentsMargins(24, 24, 24, 24);
  mainLayout->setSpacing(20);

  // Header
  QLabel *header = new QLabel("Dashboard");
  header->setObjectName("Title");
  mainLayout->addWidget(header);

  // Content Area
  QHBoxLayout *cardsLayout = new QHBoxLayout();
  cardsLayout->setSpacing(12);

  cardsLayout->addWidget(new FluentCard("CPU Temp", "42.5 °C"));
  cardsLayout->addWidget(new FluentCard("Memory", "1.2 GB"));
  cardsLayout->addWidget(new FluentCard("Network", "12 Mb/s"));

  mainLayout->addLayout(cardsLayout);

  // Controls Area
  QFrame *controlsCard = new QFrame();
  controlsCard->setObjectName("Card");
  QVBoxLayout *controlsLayout = new QVBoxLayout(controlsCard);

  QLabel *lblSettings = new QLabel("System Settings");
  lblSettings->setStyleSheet("font-size: 14pt; font-weight: bold; margin-bottom: 10px; background: transparent;");
  controlsLayout->addWidget(lblSettings);

  // Input Row
  QHBoxLayout *inputRow = new QHBoxLayout();
  QLineEdit *edit = new QLineEdit();
  edit->setPlaceholderText("Enter Device Name...");
  QPushButton *btnApply = new QPushButton("Apply");
  btnApply->setObjectName("PrimaryButton");

  inputRow->addWidget(edit);
  inputRow->addWidget(btnApply);
  controlsLayout->addLayout(inputRow);

  // Progress Bar
  controlsLayout->addSpacing(10);
  QLabel *lblProgress = new QLabel("Processing...");
  lblProgress->setObjectName("Subtitle");
  controlsLayout->addWidget(lblProgress);

  QProgressBar *progress = new QProgressBar();
  progress->setValue(75);
  progress->setTextVisible(false);
  controlsLayout->addWidget(progress);

  mainLayout->addWidget(controlsCard);
  mainLayout->addStretch();

  window.show();
  return app.exec();
}