/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2021 Olive Team

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "panel.h"

#include <QCloseEvent>
#include <QDebug>
#include <QHBoxLayout>
#include <QPainter>
#include <QStyle>
#include <QStyleOption>
#include <QVariant>

#include "panel/panelmanager.h"

namespace olive {

PanelWidget::PanelWidget(const QString &object_name, QWidget *parent) :
  QDockWidget(parent),
  border_visible_(false),
  signal_instead_of_close_(false)
{
  setObjectName(object_name);
  setFocusPolicy(Qt::ClickFocus);

  connect(this, &PanelWidget::visibilityChanged, this, &PanelWidget::PanelVisibilityChanged);

  PanelManager::instance()->RegisterPanel(this);
}

PanelWidget::~PanelWidget()
{
  PanelManager::instance()->UnregisterPanel(this);
}

void PanelWidget::SetMovementLocked(bool locked)
{
  if (locked) {
    // Disable moving on QDockWidget
    setFeatures(features() & ~QDockWidget::DockWidgetMovable);

    // Hide the title bar (only real way to do this is to replace it with an empty QWidget)
    setTitleBarWidget(new QWidget(this));
  } else {
    // Re-enable moving on QDockWidget
    setFeatures(features() | QDockWidget::DockWidgetMovable);

    // Set the "custom" titlebar to null so the default gets restored
    setTitleBarWidget(nullptr);
  }
}

void PanelWidget::SetBorderVisible(bool enabled)
{
  border_visible_ = enabled;

  update();
}

void PanelWidget::SetTitle(const QString &t)
{
  title_ = t;
  UpdateTitle();
}

void PanelWidget::SetSubtitle(const QString &t)
{
  subtitle_ = t;
  UpdateTitle();
}

void PanelWidget::paintEvent(QPaintEvent *event)
{
  // Perform default behavior
  QDockWidget::paintEvent(event);

  // Check if this panel (or a child of it) has focus using PanelFocusManager
  if (border_visible_) {

    // Draw a highlight border if so
    QPainter p(this);

    // We need to adjust the rect by 1 pixel since the bottom and right are "offscreen"
    QRect highlight_border = rect();
    highlight_border.adjust(0, 0, -1, -1);

    // Set the color to the palette's highlight color
    p.setPen(palette().highlight().color());

    // Draw the highlight border
    p.drawRect(highlight_border);
  }
}

void PanelWidget::UpdateTitle()
{
  // If there's no subtitle, just use the title. Otherwise, we set a formatted combination of the two that can
  // differ based on translation
  if (subtitle_.isEmpty()) {
    setWindowTitle(title_);
  } else {
    setWindowTitle(tr("%1: %2").arg(title_, subtitle_));
  }
}

void PanelWidget::PanelVisibilityChanged(bool e)
{
  if (e) {
    setFocus();
  }
}

void PanelWidget::SetSignalInsteadOfClose(bool e)
{
  signal_instead_of_close_ = e;
}

void PanelWidget::closeEvent(QCloseEvent *event)
{
  if (signal_instead_of_close_) {
    event->ignore();
    emit CloseRequested();
  } else {
    QDockWidget::closeEvent(event);
  }
}

void PanelWidget::changeEvent(QEvent *e)
{
  if (e->type() == QEvent::LanguageChange) {
    Retranslate();
  }
  QDockWidget::changeEvent(e);
}

void PanelWidget::Retranslate()
{
}

void PanelWidget::SetWidgetWithPadding(QWidget *widget)
{
  QWidget* wrapper = new QWidget();
  QHBoxLayout* layout = new QHBoxLayout(wrapper);
  layout->setMargin(layout->margin() / 2);
  layout->addWidget(widget);
  setWidget(wrapper);
}

}