#include "LauncherHomeWidget.h"

#include <QLabel>
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPixmap>
#include <QImage>
#include <QPainter>
#include <QPainterPath>
#include <QFont>
#include <QColor>

namespace {

QPixmap prepareLauncherIcon(const QString& iconPath, int size, int radius)
{
  QPixmap src(iconPath);
  if (src.isNull())
    return QPixmap();

  QImage img = src.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation)
                 .toImage()
                 .convertToFormat(QImage::Format_ARGB32);

  for (int y = 0; y < img.height(); ++y) {
    QRgb* line = reinterpret_cast<QRgb*>(img.scanLine(y));
    for (int x = 0; x < img.width(); ++x) {
      if (qRed(line[x]) > 235 && qGreen(line[x]) > 235 && qBlue(line[x]) > 235)
        line[x] = qRgba(0, 0, 0, 0);
    }
  }

  QPixmap out(size, size);
  out.fill(Qt::transparent);
  QPainter p(&out);
  p.setRenderHint(QPainter::Antialiasing, true);
  p.setRenderHint(QPainter::SmoothPixmapTransform, true);
  QPainterPath clip;
  clip.addRoundedRect(QRectF(0.5, 0.5, size - 1.0, size - 1.0), radius, radius);
  p.setClipPath(clip);
  p.drawImage(0, 0, img);
  return out;
}

QPushButton* makeAppCard(const QString& title,
                         const QString& subtitle,
                         const QString& iconPath,
                         QWidget* parent)
{
  auto* card = new QPushButton(parent);
  card->setCursor(Qt::PointingHandCursor);
  card->setFlat(true);
  card->setMinimumSize(240, 320);
  card->setMaximumWidth(300);
  card->setAttribute(Qt::WA_StyledBackground, true);
  card->setStyleSheet(
    QStringLiteral(
      "QPushButton {"
      "  background-color: #f7f8fa;"
      "  border: 1px solid #d0d5de;"
      "  border-radius: 16px;"
      "  text-align: center;"
      "  padding: 20px 18px;"
      "}"
      "QPushButton:hover {"
      "  background-color: #eef2f7;"
      "  border: 1px solid #aeb6c4;"
      "}"
      "QPushButton:pressed {"
      "  background-color: #e4e9f0;"
      "}"));

  auto* lay = new QVBoxLayout(card);
  lay->setSpacing(14);
  lay->setContentsMargins(22, 26, 22, 26);

  auto* icon = new QLabel(card);
  icon->setAlignment(Qt::AlignCenter);
  icon->setFixedSize(148, 148);
  icon->setStyleSheet(QStringLiteral("background: transparent; border: none;"));
  const QPixmap pm = prepareLauncherIcon(iconPath, 148, 28);
  if (!pm.isNull())
    icon->setPixmap(pm);
  icon->setAttribute(Qt::WA_TransparentForMouseEvents);
  lay->addWidget(icon, 0, Qt::AlignHCenter);

  auto* t = new QLabel(title, card);
  t->setAlignment(Qt::AlignCenter);
  QFont tf = t->font();
  tf.setPointSize(15);
  tf.setBold(true);
  t->setFont(tf);
  t->setStyleSheet(QStringLiteral("color:#2a3140; background:transparent; border:none;"));
  t->setAttribute(Qt::WA_TransparentForMouseEvents);
  lay->addWidget(t);

  auto* s = new QLabel(subtitle, card);
  s->setAlignment(Qt::AlignCenter);
  s->setWordWrap(true);
  s->setStyleSheet(QStringLiteral("color:#6a7385; background:transparent; border:none; font-size:12px;"));
  s->setAttribute(Qt::WA_TransparentForMouseEvents);
  lay->addWidget(s);
  lay->addStretch(1);
  return card;
}

} // namespace

LauncherHomeWidget::LauncherHomeWidget(QWidget* parent)
  : QWidget(parent)
{
  setAttribute(Qt::WA_StyledBackground, true);
  setStyleSheet(QStringLiteral(
    "LauncherHomeWidget {"
    "  background: #f0f2f5;"
    "}"));

  auto* root = new QVBoxLayout(this);
  root->setContentsMargins(48, 40, 48, 48);
  root->setSpacing(28);

  auto* brand = new QLabel(tr("Dose Comparison & Analysis Tools"), this);
  QFont bf = brand->font();
  bf.setPointSize(22);
  bf.setBold(false);
  brand->setFont(bf);
  brand->setStyleSheet(QStringLiteral("color:#333945; background:transparent;"));
  brand->setAlignment(Qt::AlignCenter);
  root->addWidget(brand);

  auto* hint = new QLabel(tr("选择一个应用开始"), this);
  hint->setAlignment(Qt::AlignCenter);
  hint->setStyleSheet(QStringLiteral("color:#7a8496; font-size:14px; background:transparent;"));
  root->addWidget(hint);

  auto* row = new QHBoxLayout();
  row->setSpacing(36);
  row->addStretch(1);

  auto* profileCard = makeAppCard(
    tr("Profile Comparison"),
    tr("剂量三切面叠加与交线 Profile 对比"),
    QStringLiteral(":/app-profile.png"),
    this);
  connect(profileCard, &QPushButton::clicked, this, &LauncherHomeWidget::openProfileRequested);
  row->addWidget(profileCard);

  auto* dvhCard = makeAppCard(
    tr("DVH Comparison"),
    tr("多剂量计划与结构勾画的 DVH 对比"),
    QStringLiteral(":/app-dvh.png"),
    this);
  connect(dvhCard, &QPushButton::clicked, this, &LauncherHomeWidget::openDvhRequested);
  row->addWidget(dvhCard);

  auto* gammaCard = makeAppCard(
    tr("Gamma Analysis"),
    tr("Background / Front 三维 Gamma 通过率与 Gamma Map"),
    QStringLiteral(":/app-gamma.png"),
    this);
  connect(gammaCard, &QPushButton::clicked, this, &LauncherHomeWidget::openGammaRequested);
  row->addWidget(gammaCard);

  row->addStretch(1);
  root->addLayout(row, 1);
}