// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: 2017-2019 Alejandro Sirgo Rica & Contributors

#include "utilitypanel.h"
#include "capturewidget.h"
#include <QHBoxLayout>
#include <QListWidget>
#include <QPropertyAnimation>
#include <QPushButton>
#include <QScrollArea>
#include <QTimer>

UtilityPanel::UtilityPanel(CaptureWidget* captureWidget)
  : QWidget(captureWidget)
  , m_captureWidget(captureWidget)
  , m_internalPanel(nullptr)
  , m_upLayout(nullptr)
  , m_bottomLayout(nullptr)
  , m_layout(nullptr)
  , m_showAnimation(nullptr)
  , m_hideAnimation(nullptr)
  , m_layersLayout(nullptr)
  , m_captureTools(nullptr)
  , m_buttonDelete(nullptr)
  , m_buttonMoveUp(nullptr)
  , m_buttonMoveDown(nullptr)
{
    initInternalPanel();
    setAttribute(Qt::WA_TransparentForMouseEvents);
    setCursor(Qt::ArrowCursor);

    m_showAnimation = new QPropertyAnimation(m_internalPanel, "geometry", this);
    m_showAnimation->setEasingCurve(QEasingCurve::InOutQuad);
    m_showAnimation->setDuration(300);

    m_hideAnimation = new QPropertyAnimation(m_internalPanel, "geometry", this);
    m_hideAnimation->setEasingCurve(QEasingCurve::InOutQuad);
    m_hideAnimation->setDuration(300);

    connect(m_hideAnimation,
            &QPropertyAnimation::finished,
            m_internalPanel,
            &QWidget::hide);

#if (defined(Q_OS_WIN) || defined(Q_OS_MACOS))
    move(0, 0);
#endif
    hide();
}

QWidget* UtilityPanel::toolWidget() const
{
    return m_toolWidget;
}

void UtilityPanel::setToolWidget(QWidget* widget)
{
    if (m_toolWidget != nullptr) {
        m_toolWidget->hide();
        m_toolWidget->setParent(this);
        m_toolWidget->deleteLater();
    }
    if (widget != nullptr) {
        m_toolWidget = widget;
        m_toolWidget->setSizePolicy(QSizePolicy::Ignored,
                                    QSizePolicy::Preferred);
        m_upLayout->addWidget(widget);
    }
}

void UtilityPanel::clearToolWidget()
{
    if (m_toolWidget != nullptr) {
        m_toolWidget->deleteLater();
    }
}

void UtilityPanel::pushWidget(QWidget* widget)
{
    m_layout->insertWidget(m_layout->count() - 1, widget);
}

void UtilityPanel::show()
{
    setAttribute(Qt::WA_TransparentForMouseEvents, false);
    m_showAnimation->setStartValue(QRect(-width(), 0, 0, height()));
    m_showAnimation->setEndValue(QRect(0, 0, width(), height()));
    m_internalPanel->show();
    m_showAnimation->start();
#if (defined(Q_OS_WIN) || defined(Q_OS_MACOS))
    move(0, 0);
#endif
    QWidget::show();
}

void UtilityPanel::hide()
{
    setAttribute(Qt::WA_TransparentForMouseEvents);
    m_hideAnimation->setStartValue(QRect(0, 0, width(), height()));
    m_hideAnimation->setEndValue(QRect(-width(), 0, 0, height()));
    m_hideAnimation->start();
    m_internalPanel->hide();
    QWidget::hide();
}

void UtilityPanel::toggle()
{
    if (m_internalPanel->isHidden()) {
        show();
    } else {
        hide();
    }
}

void UtilityPanel::initInternalPanel()
{
    m_internalPanel = new QScrollArea(this);
    m_internalPanel->setAttribute(Qt::WA_NoMousePropagation);
    auto* widget = new QWidget();
    m_internalPanel->setWidget(widget);
    m_internalPanel->setWidgetResizable(true);

    m_layout = new QVBoxLayout();
    m_upLayout = new QVBoxLayout();
    m_bottomLayout = new QVBoxLayout();
    m_layersLayout = new QVBoxLayout();
    m_layout->addLayout(m_upLayout);
    m_layout->addLayout(m_bottomLayout);
    m_bottomLayout->addLayout(m_layersLayout);
    widget->setLayout(m_layout);

    QColor bgColor = palette().window().color();
    bgColor.setAlphaF(0.0);
    m_internalPanel->setStyleSheet(
      QStringLiteral("QScrollArea {background-color: %1}").arg(bgColor.name()));
    m_internalPanel->hide();

    m_captureTools = new QListWidget(this);
    connect(m_captureTools,
            SIGNAL(currentRowChanged(int)),
            this,
            SLOT(onCurrentRowChanged(int)));

    auto* layersButtons = new QHBoxLayout();
    m_layersLayout->addLayout(layersButtons);

    m_layersLayout->addWidget(m_captureTools);

    bool isDark = ColorUtils::colorIsDark(bgColor);
    QString coloredIconPath =
      isDark ? PathInfo::whiteIconPath() : PathInfo::blackIconPath();

    m_buttonDelete = new QPushButton(this);
    m_buttonDelete->setIcon(QIcon(coloredIconPath + "delete.svg"));
    m_buttonDelete->setMinimumWidth(m_buttonDelete->height());
    m_buttonDelete->setDisabled(true);

    m_buttonMoveUp = new QPushButton(this);
    m_buttonMoveUp->setIcon(QIcon(coloredIconPath + "move_up.svg"));
    m_buttonMoveUp->setMinimumWidth(m_buttonMoveUp->height());
    m_buttonMoveUp->setDisabled(true);

    m_buttonMoveDown = new QPushButton(this);
    m_buttonMoveDown->setIcon(QIcon(coloredIconPath + "move_down.svg"));
    m_buttonMoveDown->setMinimumWidth(m_buttonMoveDown->height());
    m_buttonMoveDown->setDisabled(true);

    layersButtons->addWidget(m_buttonDelete);
    layersButtons->addWidget(m_buttonMoveUp);
    layersButtons->addWidget(m_buttonMoveDown);
    layersButtons->addStretch();

    connect(m_buttonDelete,
            SIGNAL(clicked(bool)),
            this,
            SLOT(slotButtonDelete(bool)));

    connect(m_buttonMoveUp,
            &QPushButton::clicked,
            this,
            &UtilityPanel::slotUpClicked);

    connect(m_buttonMoveDown,
            &QPushButton::clicked,
            this,
            &UtilityPanel::slotDownClicked);

    // Bottom
    auto* closeButton = new QPushButton(this);
    closeButton->setText(tr("Close"));
    connect(closeButton, &QPushButton::clicked, this, &UtilityPanel::toggle);
    m_bottomLayout->addWidget(closeButton);
}

void UtilityPanel::fillCaptureTools(
  const QList<QPointer<CaptureTool>>& captureToolObjects)
{
    int currentSelection = m_captureTools->currentRow();
    m_captureTools->clear();
    m_captureTools->addItem(tr("<Empty>"));

    for (auto toolItem : captureToolObjects) {
        auto* item = new QListWidgetItem(
          toolItem->icon(QColor(Qt::white), false), toolItem->info());
        m_captureTools->addItem(item);
    }
    if (currentSelection >= 0 && currentSelection < m_captureTools->count()) {
        m_captureTools->setCurrentRow(currentSelection);
    }
}

void UtilityPanel::setActiveLayer(int index)
{
    Q_ASSERT(index >= -1);
    m_captureTools->setCurrentRow(index + 1);
}

int UtilityPanel::activeLayerIndex()
{
    return m_captureTools->currentRow() >= 0 ? m_captureTools->currentRow() - 1
                                             : -1;
}

void UtilityPanel::onCurrentRowChanged(int currentRow)
{
    m_buttonDelete->setDisabled(currentRow <= 0);
    m_buttonMoveDown->setDisabled(currentRow == 0 ||
                                  currentRow + 1 == m_captureTools->count());
    m_buttonMoveUp->setDisabled(currentRow <= 1);

    emit layerChanged(activeLayerIndex());
}

void UtilityPanel::slotUpClicked(bool clicked)
{
    Q_UNUSED(clicked);
    // subtract 1 because there's <empty> in m_captureTools as [0] element
    int toolRow = m_captureTools->currentRow() - 1;
    m_captureTools->setCurrentRow(toolRow);
    emit moveUpClicked(toolRow);
}

void UtilityPanel::slotDownClicked(bool clicked)
{
    Q_UNUSED(clicked);
    // subtract 1 because there's <empty> in m_captureTools as [0] element
    int toolRow = m_captureTools->currentRow() - 1;
    m_captureTools->setCurrentRow(toolRow + 2);
    emit moveDownClicked(toolRow);
}

void UtilityPanel::slotButtonDelete(bool clicked)
{
    Q_UNUSED(clicked)
    int currentRow = m_captureTools->currentRow();
    if (currentRow > 0) {
        m_captureWidget->removeToolObject(currentRow);
        if (currentRow >= m_captureTools->count()) {
            currentRow = m_captureTools->count() - 1;
        }
    } else {
        currentRow = 0;
    }
    m_captureTools->setCurrentRow(currentRow);
}

bool UtilityPanel::isVisible() const
{
    return !m_internalPanel->isHidden();
}