/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2017  Vladimir Golovnev <glassez@yandex.ru>
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

#include "articlelistwidget.h"

#include <QListWidgetItem>

#include "base/rss/rss_article.h"
#include "base/rss/rss_item.h"

ArticleListWidget::ArticleListWidget(QWidget *parent)
    : QListWidget(parent)
{
    setContextMenuPolicy(Qt::CustomContextMenu);
    setSelectionMode(QAbstractItemView::ExtendedSelection);
}

RSS::Article *ArticleListWidget::getRSSArticle(QListWidgetItem *item) const
{
    Q_ASSERT(item);
    return reinterpret_cast<RSS::Article *>(item->data(Qt::UserRole).value<quintptr>());
}

QListWidgetItem *ArticleListWidget::mapRSSArticle(RSS::Article *rssArticle) const
{
    return m_rssArticleToListItemMapping.value(rssArticle);
}

void ArticleListWidget::setRSSItem(RSS::Item *rssItem, bool unreadOnly)
{
    // Clear the list first
    clear();
    m_rssArticleToListItemMapping.clear();
    if (m_rssItem)
        m_rssItem->disconnect(this);

    m_unreadOnly = unreadOnly;
    m_rssItem = rssItem;
    if (!m_rssItem) return;

    m_rssItem = rssItem;
    connect(m_rssItem, &RSS::Item::newArticle, this, &ArticleListWidget::handleArticleAdded);
    connect(m_rssItem, &RSS::Item::articleRead, this, &ArticleListWidget::handleArticleRead);
    connect(m_rssItem, &RSS::Item::articleAboutToBeRemoved, this, &ArticleListWidget::handleArticleAboutToBeRemoved);

    foreach (auto article, rssItem->articles()) {
        if (!(m_unreadOnly && article->isRead()))
            addItem(createItem(article));
    }
}

void ArticleListWidget::handleArticleAdded(RSS::Article *rssArticle)
{
    if (!(m_unreadOnly && rssArticle->isRead()))
        insertItem(0, createItem(rssArticle));
}

void ArticleListWidget::handleArticleRead(RSS::Article *rssArticle)
{
    if (m_unreadOnly) {
        delete m_rssArticleToListItemMapping.take(rssArticle);
    }
    else {
        auto item = mapRSSArticle(rssArticle);
        item->setData(Qt::ForegroundRole, QColor("grey"));
        item->setData(Qt::DecorationRole, QIcon(":/icons/sphere.png"));
    }
}

void ArticleListWidget::handleArticleAboutToBeRemoved(RSS::Article *rssArticle)
{
    delete m_rssArticleToListItemMapping.take(rssArticle);
}

QListWidgetItem *ArticleListWidget::createItem(RSS::Article *article)
{
    Q_ASSERT(article);
    QListWidgetItem *item = new QListWidgetItem;

    item->setData(Qt::DisplayRole, article->title());
    item->setData(Qt::UserRole, reinterpret_cast<quintptr>(article));
    if (article->isRead()) {
        item->setData(Qt::ForegroundRole, QColor("grey"));
        item->setData(Qt::DecorationRole, QIcon(":/icons/sphere.png"));
    }
    else {
        item->setData(Qt::ForegroundRole, QColor("blue"));
        item->setData(Qt::DecorationRole, QIcon(":/icons/sphere2.png"));
    }

    m_rssArticleToListItemMapping.insert(article, item);
    return item;
}