/*
 * psifilteredcontactlistview.cpp
 * Copyright (C) 2010  Yandex LLC (Michail Pishchagin)
 *
 * 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 2
 * 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 <https://www.gnu.org/licenses/>.
 *
 */

#include "psifilteredcontactlistview.h"

#include "contactlistviewdelegate.h"
#include "psioptions.h"

#include <QKeyEvent>
#include <QPainter>

PsiFilteredContactListView::PsiFilteredContactListView(QWidget *parent) : PsiContactListView(parent)
{
    // setFocusPolicy(Qt::NoFocus);

    // setDragEnabled(false);
    setAcceptDrops(false);
}

bool PsiFilteredContactListView::handleKeyPressEvent(QKeyEvent *e)
{
    updateKeyboardModifiers(e);

    switch (e->key()) {
    case Qt::Key_Enter:
    case Qt::Key_Return: {
        if (state() == EditingState)
            return false;

        QModelIndex currentIndex = this->currentIndex();
        if (currentIndex.isValid()) {
            // TODO: probably should select the item from the filteredListView_
            // in the contactListView_ as well
            activate(currentIndex);
        }
        return true;
    }
    case Qt::Key_Home: {
        selectIndex(0);
        return true;
    }
    case Qt::Key_End: {
        selectIndex(model()->rowCount() - 1);
        return true;
    }
    case Qt::Key_Up:
    case Qt::Key_Down: {
        moveSelection(1, e->key() == Qt::Key_Up ? Backward : Forward);
        return true;
    }
    case Qt::Key_PageUp:
    case Qt::Key_PageDown: {
        int         delta = 0;
        QModelIndex index = model()->index(0, 0, QModelIndex());
        if (index.isValid()) {
            int itemHeight = itemDelegate()->sizeHint(QStyleOptionViewItem(), index).height();
            if (itemHeight)
                delta = viewport()->height() / itemHeight;
        }
        moveSelection(uint(delta), e->key() == Qt::Key_PageUp ? Backward : Forward);
        return true;
    }
    default:;
    }

    return false;
}

void PsiFilteredContactListView::moveSelection(uint delta, PsiFilteredContactListView::Direction direction)
{
    QModelIndex currentIndex = this->currentIndex();
    uint        row          = uint(currentIndex.row());
    if (currentIndex.isValid())
        row = direction == Forward ? (row + delta) : (row - delta);
    else
        row = 0;
    selectIndex(int(row));
}

void PsiFilteredContactListView::selectIndex(int row)
{
    setUpdatesEnabled(false);

    row                  = qMax(0, qMin(model()->rowCount() - 1, row));
    QModelIndex newIndex = model()->index(row, 0, QModelIndex());
    if (newIndex.isValid()) {
        QItemSelection selection(selectionModel()->selection());
        if (extendSelection()) {
            selection.select(currentIndex(), newIndex);
            selection.select(newIndex, currentIndex());
        }

        setCurrentIndex(newIndex);

        if (extendSelection()) {
            selectionModel()->select(selection, QItemSelectionModel::Select);
        }
    }

    setUpdatesEnabled(true);
}

void PsiFilteredContactListView::itemActivated(const QModelIndex &index)
{
    PsiContactListView::itemActivated(index);
    if (PsiOptions::instance()->getOption("options.ui.contactlist.autohide-contact-filter").toBool())
        emit quitFilteringMode();
}

bool PsiFilteredContactListView::extendSelection() const { return bool(keyboardModifiers() & Qt::ShiftModifier); }
