/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2019  Mike Tzou (Chocobo1)
 *
 * 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 "trackerentriesdialog.h"

#include <algorithm>

#include <QHash>
#include <QVector>

#include "base/bittorrent/trackerentry.h"
#include "ui_trackerentriesdialog.h"
#include "utils.h"

#define SETTINGS_KEY(name) "TrackerEntriesDialog/" name

TrackerEntriesDialog::TrackerEntriesDialog(QWidget *parent)
    : QDialog(parent)
    , m_ui(new Ui::TrackerEntriesDialog)
    , m_storeDialogSize(SETTINGS_KEY("Size"))
{
    m_ui->setupUi(this);

    connect(m_ui->buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
    connect(m_ui->buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);

    loadSettings();
}

TrackerEntriesDialog::~TrackerEntriesDialog()
{
    saveSettings();

    delete m_ui;
}

void TrackerEntriesDialog::setTrackers(const QVector<BitTorrent::TrackerEntry> &trackers)
{
    int maxTier = -1;
    QHash<int, QString> tiers;  // <tier, tracker URLs>

    for (const BitTorrent::TrackerEntry &entry : trackers)
    {
        tiers[entry.tier] += (entry.url + '\n');
        maxTier = std::max(maxTier, entry.tier);
    }

    QString text = tiers.value(0);

    for (int i = 1; i <= maxTier; ++i)
        text += ('\n' + tiers.value(i));

    m_ui->plainTextEdit->setPlainText(text);
}

QVector<BitTorrent::TrackerEntry> TrackerEntriesDialog::trackers() const
{
    const QString plainText = m_ui->plainTextEdit->toPlainText();
    const QVector<QStringRef> lines = plainText.splitRef('\n');

    QVector<BitTorrent::TrackerEntry> entries;
    entries.reserve(lines.size());

    int tier = 0;
    for (QStringRef line : lines)
    {
        line = line.trimmed();

        if (line.isEmpty())
        {
            ++tier;
            continue;
        }

        entries.append({line.toString(), tier});
    }

    return entries;
}

void TrackerEntriesDialog::saveSettings()
{
    m_storeDialogSize = size();
}

void TrackerEntriesDialog::loadSettings()
{
    Utils::Gui::resize(this, m_storeDialogSize);
}
