#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QApplication>
#include <QPixmap>
#include <QResizeEvent>

MainWindow::MainWindow(const QStringList &filePaths, QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow) {
  ui->setupUi(this);

  connect(ui->actionQuit, &QAction::triggered, qApp, &QApplication::quit);

  if (!filePaths.isEmpty()) {
    current.load(filePaths.first());
    setWindowTitle(title_format.arg(filePaths.first()));
    fit();
  }

  connect(ui->ori_toolButton, &QToolButton::clicked, [this]() { scale(1.0); });
  connect(ui->fit_toolButton, &QToolButton::clicked, [this]() { fit(); });

  connect(ui->scale_slider, &QSlider::sliderMoved,
          [this](int value) { scale(static_cast<double>(value) / 100.0f); });
}

MainWindow::~MainWindow() { delete ui; }

void MainWindow::resizeEvent(QResizeEvent *event) {
  fit();
  QMainWindow::resizeEvent(event);
}

void MainWindow::fit() {
  const auto pixmpSize = current.size();
  const auto scaleSize =
      pixmpSize.scaled(ui->scrollArea->viewport()->size(), Qt::KeepAspectRatio);

  const int scale = std::min(scaleSize.width() * 100 / pixmpSize.width(),
                             scaleSize.height() * 100 / pixmpSize.height());

  ui->label->setPixmap(
      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
  ui->scale_slider->setValue(scale);
  ui->scale_label->setText(scale_format.arg(scale));
}

void MainWindow::scale(double scale) {
  const auto scaleSize = current.size() * scale;
  ui->label->setPixmap(
      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
  ui->scale_slider->setValue(scale * 100);
  ui->scale_label->setText(scale_format.arg(scale * 100));
}