#include "lts_picture_editing.h"
#include "ui_lts_picture_editing.h"
#include "lts_picture_view.h"

#include <QFileDialog>
#include <QPixmap>
#include <QMessageBox>
#include <QImage>
#include <QGraphicsPixmapItem>

#include <QDebug>
#include <QTimer>

LtsPictureEditing::LtsPictureEditing(QWidget *parent)
  : QMainWindow(parent)
  , m_gvPicture(nullptr)
  , m_ui(new Ui::PictureEditing)
{
  m_ui->setupUi(this);
  connect(m_ui->actionOpen, &QAction::triggered, this, &LtsPictureEditing::onOpenImage);
  connect(m_ui->actionSave, &QAction::triggered, this, &LtsPictureEditing::onSavePicture);
  connect(m_ui->actionQuit, &QAction::triggered, this, &LtsPictureEditing::close);
  connect(m_ui->pbSetSize, &QPushButton::clicked, this, &LtsPictureEditing::onSetSize);

  connect(m_ui->sbHeight, QOverload<int>::of(&QSpinBox::valueChanged), this, &LtsPictureEditing::onRatioChanged);
  connect(m_ui->sbWidth, QOverload<int>::of(&QSpinBox::valueChanged), this, &LtsPictureEditing::onRatioChanged);
  connect(m_ui->chbRatio, &QPushButton::clicked, this, &LtsPictureEditing::onRatioClicked);

  connect(m_ui->sbXMin, QOverload<int>::of(&QSpinBox::valueChanged), this, &LtsPictureEditing::onLeftChanged);
  connect(m_ui->sbXMax, QOverload<int>::of(&QSpinBox::valueChanged), this, &LtsPictureEditing::onRightChanged);
  connect(m_ui->sbYMin, QOverload<int>::of(&QSpinBox::valueChanged), this, &LtsPictureEditing::onTopChanged);
  connect(m_ui->sbYMax, QOverload<int>::of(&QSpinBox::valueChanged), this, &LtsPictureEditing::onBottomChanged);

  addViewToFrame();

  connect(this, &LtsPictureEditing::leftChanged, m_gvPicture, &LtsWidgets::LtsPictureView::leftChanged);
  connect(this, &LtsPictureEditing::rightChanged, m_gvPicture, &LtsWidgets::LtsPictureView::rightChanged);
  connect(this, &LtsPictureEditing::topChanged, m_gvPicture, &LtsWidgets::LtsPictureView::topChanged);
  connect(this, &LtsPictureEditing::bottomChanged, m_gvPicture, &LtsWidgets::LtsPictureView::bottomChanged);

  connect(this, &LtsPictureEditing::setAspectRatio, m_gvPicture, &LtsWidgets::LtsPictureView::setAspectRatio);
  connect(this, &LtsPictureEditing::ratioClicked, m_gvPicture, &LtsWidgets::LtsPictureView::ratioClicked);

  connect(m_gvPicture, &LtsWidgets::LtsPictureView::mouseMoved, this, &LtsPictureEditing::setSpinboxValues);
  connect(m_gvPicture, &LtsWidgets::LtsPictureView::setLimits, this, &LtsPictureEditing::setSpinboxLimits);
  connect(this, &LtsPictureEditing::setPicture, m_gvPicture, &LtsWidgets::LtsPictureView::setPicture);

  onRatioChanged();
}

LtsPictureEditing::~LtsPictureEditing()
{
  delete m_ui;
}

void LtsPictureEditing::addViewToFrame()
{
  QHBoxLayout *layout(new QHBoxLayout(m_ui->frPicFrame));
  m_gvPicture = new LtsWidgets::LtsPictureView(m_ui->frPicFrame);
  layout->addWidget(m_gvPicture);
  m_gvPicture->setEnabled(false);
}

void LtsPictureEditing::onOpenImage()
{
  const QStringList filter ({
                              tr("Images (*.jpg *.jpeg *.png)")
                            });
  QString fileName = QFileDialog::getOpenFileName(this, tr("Open Image"),
                                                  QStringLiteral("../picture_editing"),
                                                  filter.join(QStringLiteral(";;")));

  if (fileName.isEmpty())
    return;

  QFileInfo fi(fileName);
  if (!fi.isReadable())
  {
    QMessageBox::warning(this, tr("Error!"), tr("An error occurred while loading the file.\n"
                                                "The loaded file is not readable."));
    return;
  }

  QImage pic;
  pic.load(fileName);
  if (pic.isNull())
  {
    QMessageBox::warning(this, tr("Error!"), tr("An error occurred while loading the file.\n"
                                                 "The loaded file is no picture file.\n"
                                                 "Please load *.jpg, *.jpeg, *.png files only."));
    return;
  }
  m_image = pic;
  emit setPicture(pic, QPoint(0, 0), true);
  m_gvPicture->setEnabled(true);
  m_gvPicture->newRubberBand();
}

void LtsPictureEditing::onSetSize()
{
  if (m_image.isNull())
    return;

  m_gvPicture->hideRubberband();

  int xMin = m_ui->sbXMin->value() - 1;
  int yMin = m_ui->sbYMin->value() - 1;
  int xMax = m_ui->sbXMax->value() - 1;
  int yMax = m_ui->sbYMax->value() - 1;

  if (xMax < xMin || yMax < yMin || xMax == xMin || yMax == yMin)
  {
    clear();
    return;
  }

  QRect picRect(xMin,
                yMin,
                xMax - xMin,
                yMax - yMin);
  QImage newPic = m_image.copy(picRect);
   emit setPicture(newPic, QPoint(xMin, yMin), false);
}

void LtsPictureEditing::onSavePicture()
{
  if (m_gvPicture->getImage()->pixmap().isNull())
  {
    QMessageBox::warning(this, tr("Error!"), tr("An error occurred while saving the picture\n"
                                                "Please load a picture before saving it."));
    return;
  }
  else
  {
    QString filename = QFileDialog::getSaveFileName(this, tr("Open Image"), QLatin1String("../picture_editing"),
                                                    tr("Images (*.jpg *.jpeg *.png)"));
    if (filename.isEmpty())
    {
      QMessageBox::warning(this, tr("Error!"), tr("An error occurred while saving the picture.\n"
                                                  "Please choose a valid path to save the picture."));
      return;
    }

    m_gvPicture->getImage()->pixmap().save(filename, "PNG");
  }
}

void LtsPictureEditing::setSpinboxLimits(const QSize &picSize, bool setValues)
{
  m_ui->sbXMin->setMaximum(picSize.width());
  m_ui->sbXMax->setMaximum(picSize.width());
  m_ui->sbYMin->setMaximum(picSize.height());
  m_ui->sbYMax->setMaximum(picSize.height());

  if (setValues)
  {
    m_ui->sbXMin->setValue(0);
    m_ui->sbYMin->setValue(0);
    m_ui->sbXMax->setValue(picSize.width() - 1);
    m_ui->sbYMax->setValue(picSize.height() - 1);
  }
}

void LtsPictureEditing::setSpinboxValues(const QRect &picRect)
{
  m_ui->sbXMin->setValue(picRect.left());
  m_ui->sbYMin->setValue(picRect.top());
  m_ui->sbXMax->setValue(picRect.right());
  m_ui->sbYMax->setValue(picRect.bottom());
}

void LtsPictureEditing::onRatioChanged()
{
  double ratio =  double(m_ui->sbWidth->value()) / double(m_ui->sbHeight->value());
  emit setAspectRatio(ratio);
}

void LtsPictureEditing::onRatioClicked()
{
  if (m_ui->chbRatio->isChecked())
  {
    m_ui->sbHeight->setEnabled(true);
    m_ui->sbWidth->setEnabled(true);
    emit ratioClicked(true);
  }
  else
  {
    m_ui->sbHeight->setEnabled(false);
    m_ui->sbWidth->setEnabled(false);
    emit ratioClicked(false);
  }
}

void LtsPictureEditing::onLeftChanged(int left)
{
  emit leftChanged(left);
}

void LtsPictureEditing::onRightChanged(int right)
{
  emit rightChanged(right);
}

void LtsPictureEditing::onTopChanged(int top)
{
  emit topChanged(top);
}

void LtsPictureEditing::onBottomChanged(int bottom)
{
  emit bottomChanged(bottom);
}


void LtsPictureEditing::clear()
{
   emit setPicture(QImage(), QPoint(), false);
}