// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "consoleview.h"

#include "consoleitemdelegate.h"
#include "consoleitemmodel.h"
#include "../debuggertr.h"

#include <coreplugin/editormanager/editormanager.h>
#include <coreplugin/manhattanstyle.h>
#include <qtsupport/baseqtversion.h>

#include <utils/hostosinfo.h>
#include <utils/stringutils.h>

#include <QAction>
#include <QMenu>
#include <QMouseEvent>
#include <QPainter>
#include <QApplication>
#include <QAbstractProxyModel>
#include <QFileInfo>
#include <QScrollBar>
#include <QStyleFactory>
#include <QString>
#include <QUrl>

namespace Debugger {
namespace Internal {

ConsoleView::ConsoleView(ConsoleItemModel *model, QWidget *parent) :
    Utils::TreeView(parent), m_model(model)
{
    setFrameStyle(QFrame::NoFrame);
    setHeaderHidden(true);
    setRootIsDecorated(false);
    setEditTriggers(QAbstractItemView::AllEditTriggers);
    setStyleSheet("QTreeView::branch:has-siblings:!adjoins-item {"
                  "border-image: none;"
                  "image: none; }"
                  "QTreeView::branch:has-siblings:adjoins-item {"
                  "border-image: none;"
                  "image: none; }"
                  "QTreeView::branch:!has-children:!has-siblings:adjoins-item {"
                  "border-image: none;"
                  "image: none; }"
                  "QTreeView::branch:has-children:!has-siblings:closed,"
                  "QTreeView::branch:closed:has-children:has-siblings {"
                  "border-image: none;"
                  "image: none; }"
                  "QTreeView::branch:open:has-children:!has-siblings,"
                  "QTreeView::branch:open:has-children:has-siblings  {"
                  "border-image: none;"
                  "image: none; }");

    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
    setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
    horizontalScrollBar()->setSingleStep(20);
    verticalScrollBar()->setSingleStep(20);

    connect(this, &ConsoleView::activated, this, &ConsoleView::onRowActivated);
}

void ConsoleView::onScrollToBottom()
{
    // Keep scrolling to bottom if scroll bar is not at maximum()
    if (verticalScrollBar()->value() != verticalScrollBar()->maximum())
        scrollToBottom();
}

void ConsoleView::populateFileFinder()
{
    QtSupport::QtVersion::populateQmlFileFinder(&m_finder, nullptr);
}

void ConsoleView::mousePressEvent(QMouseEvent *event)
{
    QPoint pos = event->pos();
    QModelIndex index = indexAt(pos);
    if (index.isValid()) {
        ConsoleItem::ItemType type = (ConsoleItem::ItemType)index.data(
                    ConsoleItem::TypeRole).toInt();
        bool handled = false;
        if (type == ConsoleItem::DefaultType) {
            bool showTypeIcon = index.parent() == QModelIndex();
            QStyleOptionViewItem option;
            initViewItemOption(&option);
            ConsoleItemPositions positions(m_model, visualRect(index), option.font, showTypeIcon, true);

            if (positions.expandCollapseIcon().contains(pos)) {
                if (isExpanded(index))
                    setExpanded(index, false);
                else
                    setExpanded(index, true);
                handled = true;
            }
        }
        if (!handled)
            Utils::TreeView::mousePressEvent(event);
    }
}

void ConsoleView::resizeEvent(QResizeEvent *e)
{
    static_cast<ConsoleItemDelegate *>(itemDelegate())->emitSizeHintChanged(
                selectionModel()->currentIndex());
    Utils::TreeView::resizeEvent(e);
}

void ConsoleView::drawBranches(QPainter *painter, const QRect &rect,
                                  const QModelIndex &index) const
{
    static_cast<ConsoleItemDelegate *>(itemDelegate())->drawBackground(painter, rect, index, {});
    Utils::TreeView::drawBranches(painter, rect, index);
}

void ConsoleView::contextMenuEvent(QContextMenuEvent *event)
{
    QModelIndex itemIndex = indexAt(event->pos());
    QMenu menu;

    auto copy = new QAction(Tr::tr("&Copy"), this);
    copy->setEnabled(itemIndex.isValid());
    menu.addAction(copy);
    auto show = new QAction(Tr::tr("&Show in Editor"), this);
    show->setEnabled(canShowItemInTextEditor(itemIndex));
    menu.addAction(show);
    menu.addSeparator();
    auto clear = new QAction(Tr::tr("C&lear"), this);
    menu.addAction(clear);

    QAction *a = menu.exec(event->globalPos());
    if (a == nullptr)
        return;

    if (a == copy) {
        copyToClipboard(itemIndex);
    } else if (a == show) {
        onRowActivated(itemIndex);
    } else if (a == clear) {
        auto proxyModel = qobject_cast<QAbstractProxyModel*>(model());
        auto handler = qobject_cast<ConsoleItemModel*>(
                    proxyModel->sourceModel());
        handler->clear();
    }
}

void ConsoleView::focusInEvent(QFocusEvent *event)
{
    Q_UNUSED(event)
    selectionModel()->setCurrentIndex(model()->index(model()->rowCount() - 1, 0),
                                      QItemSelectionModel::ClearAndSelect);
}

void ConsoleView::onRowActivated(const QModelIndex &index)
{
    if (!index.isValid())
        return;

    const Utils::FilePath fp
        = m_finder.findFile(model()->data(index, ConsoleItem::FileRole).toString()).constFirst();
    if (fp.exists() && fp.isFile() && fp.isReadableFile()) {
        Core::EditorManager::openEditorAt({fp, model()->data(index, ConsoleItem::LineRole).toInt()});
    }
}

void ConsoleView::copyToClipboard(const QModelIndex &index)
{
    if (!index.isValid())
        return;

    QString contents = model()->data(index, ConsoleItem::ExpressionRole).toString();
    // See if we have file and line Info
    QString filePath = model()->data(index, ConsoleItem::FileRole).toString();
    const QUrl fileUrl = QUrl(filePath);
    if (fileUrl.isLocalFile())
        filePath = fileUrl.toLocalFile();
    if (!filePath.isEmpty()) {
        contents = QString::fromLatin1("%1 %2: %3").arg(contents).arg(filePath).arg(
                    model()->data(index, ConsoleItem::LineRole).toString());
    }
    Utils::setClipboardAndSelection(contents);
}

bool ConsoleView::canShowItemInTextEditor(const QModelIndex &index)
{
    if (!index.isValid())
        return false;

    bool success = false;
    m_finder.findFile(model()->data(index, ConsoleItem::FileRole).toString(), &success);
    return success;
}

} // Internal
} // Debugger