/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2015
 *
 * 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.
 */

#ifndef ADVANCEDSETTINGS_H
#define ADVANCEDSETTINGS_H

#include <QTableWidget>
#include <QHeaderView>
#include <QSpinBox>
#include <QHostAddress>
#include <QCheckBox>
#include <QLineEdit>
#include <QComboBox>
#include <QNetworkInterface>

#include "base/preferences.h"

enum AdvSettingsCols
{
    PROPERTY,
    VALUE
};
enum AdvSettingsRows
{
    DISK_CACHE,
    DISK_CACHE_TTL,
    OS_CACHE,
    SAVE_RESUME_DATA_INTERVAL,
    OUTGOING_PORT_MIN,
    OUTGOING_PORT_MAX,
    RECHECK_COMPLETED,
    LIST_REFRESH,
    RESOLVE_COUNTRIES,
    RESOLVE_HOSTS,
    MAX_HALF_OPEN,
    SUPER_SEEDING,
    NETWORK_IFACE,
    NETWORK_LISTEN_IPV6,
    NETWORK_ADDRESS,
    PROGRAM_NOTIFICATIONS,
    TRACKER_STATUS,
    TRACKER_PORT,
#if defined(Q_OS_WIN) || defined(Q_OS_MAC)
    UPDATE_CHECK,
#endif
#if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
    USE_ICON_THEME,
#endif
    CONFIRM_RECHECK_TORRENT,
    TRACKER_EXCHANGE,
    ANNOUNCE_ALL_TRACKERS,
    ROW_COUNT
};

class AdvancedSettings: public QTableWidget
{
    Q_OBJECT

private:
    QSpinBox spin_cache, spin_save_resume_data_interval, outgoing_ports_min, outgoing_ports_max, spin_list_refresh, spin_maxhalfopen, spin_tracker_port;
    QCheckBox cb_os_cache, cb_recheck_completed, cb_resolve_countries, cb_resolve_hosts,
              cb_super_seeding, cb_program_notifications, cb_tracker_status,
              cb_confirm_torrent_recheck, cb_enable_tracker_ext, cb_listen_ipv6;
    QComboBox combo_iface;
    QSpinBox spin_cache_ttl;
#if defined(Q_OS_WIN) || defined(Q_OS_MAC)
    QCheckBox cb_update_check;
#endif
#if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
    QCheckBox cb_use_icon_theme;
#endif
    QCheckBox cb_announce_all_trackers;
    QLineEdit txt_network_address;

public:
    AdvancedSettings(QWidget *parent=0): QTableWidget(parent)
    {
        // Set visual appearance
        setEditTriggers(QAbstractItemView::NoEditTriggers);
        setAlternatingRowColors(true);
        setColumnCount(2);
        QStringList header;
        header << tr("Setting") << tr("Value", "Value set for this setting");
        setHorizontalHeaderLabels(header);
        setColumnWidth(0, width()/2);
        horizontalHeader()->setStretchLastSection(true);
        verticalHeader()->setVisible(false);
        setRowCount(ROW_COUNT);
        // Signals
        connect(&spin_cache, SIGNAL(valueChanged(int)), SLOT(updateCacheSpinSuffix(int)));
        // Load settings
        loadAdvancedSettings();
    }

    ~AdvancedSettings() {}

public slots:
    void saveAdvancedSettings()
    {
        Preferences* const pref = Preferences::instance();
        // Disk write cache
        pref->setDiskCacheSize(spin_cache.value());
        pref->setDiskCacheTTL(spin_cache_ttl.value());
        // Enable OS cache
        pref->setOsCache(cb_os_cache.isChecked());
        // Save resume data interval
        pref->setSaveResumeDataInterval(spin_save_resume_data_interval.value());
        // Outgoing ports
        pref->setOutgoingPortsMin(outgoing_ports_min.value());
        pref->setOutgoingPortsMax(outgoing_ports_max.value());
        // Recheck torrents on completion
        pref->recheckTorrentsOnCompletion(cb_recheck_completed.isChecked());
        // Transfer list refresh interval
        pref->setRefreshInterval(spin_list_refresh.value());
        // Peer resolution
        pref->resolvePeerCountries(cb_resolve_countries.isChecked());
        pref->resolvePeerHostNames(cb_resolve_hosts.isChecked());
        // Max Half-Open connections
        pref->setMaxHalfOpenConnections(spin_maxhalfopen.value());
        // Super seeding
        pref->enableSuperSeeding(cb_super_seeding.isChecked());
        // Network interface
        if (combo_iface.currentIndex() == 0) {
            // All interfaces (default)
            pref->setNetworkInterface(QString::null);
            pref->setNetworkInterfaceName(QString::null);
        }
        else {
            pref->setNetworkInterface(combo_iface.itemData(combo_iface.currentIndex()).toString());
            pref->setNetworkInterfaceName(combo_iface.currentText());
        }
        // Listen on IPv6 address
        pref->setListenIPv6(cb_listen_ipv6.isChecked());
        // Network address
        QHostAddress addr(txt_network_address.text().trimmed());
        if (addr.isNull())
            pref->setNetworkAddress("");
        else
            pref->setNetworkAddress(addr.toString());
        // Program notification
        pref->useProgramNotification(cb_program_notifications.isChecked());
        // Tracker
        pref->setTrackerEnabled(cb_tracker_status.isChecked());
        pref->setTrackerPort(spin_tracker_port.value());
#if defined(Q_OS_WIN) || defined(Q_OS_MAC)
        pref->setUpdateCheckEnabled(cb_update_check.isChecked());
#endif
        // Icon theme
#if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
        pref->useSystemIconTheme(cb_use_icon_theme.isChecked());
#endif
        pref->setConfirmTorrentRecheck(cb_confirm_torrent_recheck.isChecked());
        // Tracker exchange
        pref->setTrackerExchangeEnabled(cb_enable_tracker_ext.isChecked());
        pref->setAnnounceToAllTrackers(cb_announce_all_trackers.isChecked());
    }

signals:
    void settingsChanged();

private:
    void setRow(int row, const QString &property, QSpinBox* editor)
    {
        setItem(row, PROPERTY, new QTableWidgetItem(property));
        bool ok; Q_UNUSED(ok);
        ok = connect(editor, SIGNAL(valueChanged(int)), SIGNAL(settingsChanged()));
        Q_ASSERT(ok);
        setCellWidget(row, VALUE, editor);
    }

    void setRow(int row, const QString &property, QComboBox* editor)
    {
        setItem(row, PROPERTY, new QTableWidgetItem(property));
        bool ok; Q_UNUSED(ok);
        ok = connect(editor, SIGNAL(currentIndexChanged(int)), SIGNAL(settingsChanged()));
        Q_ASSERT(ok);
        setCellWidget(row, VALUE, editor);
    }

    void setRow(int row, const QString &property, QCheckBox* editor)
    {
        setItem(row, PROPERTY, new QTableWidgetItem(property));
        bool ok; Q_UNUSED(ok);
        ok = connect(editor, SIGNAL(stateChanged(int)), SIGNAL(settingsChanged()));
        Q_ASSERT(ok);
        setCellWidget(row, VALUE, editor);
    }

    void setRow(int row, const QString &property, QLineEdit* editor)
    {
        setItem(row, PROPERTY, new QTableWidgetItem(property));
        bool ok; Q_UNUSED(ok);
        ok = connect(editor, SIGNAL(textChanged(QString)), SIGNAL(settingsChanged()));
        Q_ASSERT(ok);
        setCellWidget(row, VALUE, editor);
    }

private slots:
    void updateCacheSpinSuffix(int value)
    {
        if (value <= 0)
            spin_cache.setSuffix(tr(" (auto)"));
        else
            spin_cache.setSuffix(tr(" MiB"));
    }

    void loadAdvancedSettings()
    {
        const Preferences* const pref = Preferences::instance();
        // Disk write cache
        spin_cache.setMinimum(0);
        // When build as 32bit binary, set the maximum at less than 2GB to prevent crashes.
        // These macros may not be available on compilers other than MSVC and GCC
#if defined(__x86_64__) || defined(_M_X64)
        spin_cache.setMaximum(4096);
#else
        // allocate 1536MiB and leave 512MiB to the rest of program data in RAM
        spin_cache.setMaximum(1536);
#endif
        spin_cache.setValue(pref->diskCacheSize());
        updateCacheSpinSuffix(spin_cache.value());
        setRow(DISK_CACHE, tr("Disk write cache size"), &spin_cache);
        // Disk cache expiry
        spin_cache_ttl.setMinimum(15);
        spin_cache_ttl.setMaximum(600);
        spin_cache_ttl.setValue(pref->diskCacheTTL());
        spin_cache_ttl.setSuffix(tr(" s", " seconds"));
        setRow(DISK_CACHE_TTL, tr("Disk cache expiry interval"), &spin_cache_ttl);
        // Enable OS cache
        cb_os_cache.setChecked(pref->osCache());
        setRow(OS_CACHE, tr("Enable OS cache"), &cb_os_cache);
        // Save resume data interval
        spin_save_resume_data_interval.setMinimum(1);
        spin_save_resume_data_interval.setMaximum(1440);
        spin_save_resume_data_interval.setValue(pref->saveResumeDataInterval());
        spin_save_resume_data_interval.setSuffix(tr(" m", " minutes"));
        setRow(SAVE_RESUME_DATA_INTERVAL, tr("Save resume data interval", "How often the fastresume file is saved."), &spin_save_resume_data_interval);
        // Outgoing port Min
        outgoing_ports_min.setMinimum(0);
        outgoing_ports_min.setMaximum(65535);
        outgoing_ports_min.setValue(pref->outgoingPortsMin());
        setRow(OUTGOING_PORT_MIN, tr("Outgoing ports (Min) [0: Disabled]"), &outgoing_ports_min);
        // Outgoing port Min
        outgoing_ports_max.setMinimum(0);
        outgoing_ports_max.setMaximum(65535);
        outgoing_ports_max.setValue(pref->outgoingPortsMax());
        setRow(OUTGOING_PORT_MAX, tr("Outgoing ports (Max) [0: Disabled]"), &outgoing_ports_max);
        // Recheck completed torrents
        cb_recheck_completed.setChecked(pref->recheckTorrentsOnCompletion());
        setRow(RECHECK_COMPLETED, tr("Recheck torrents on completion"), &cb_recheck_completed);
        // Transfer list refresh interval
        spin_list_refresh.setMinimum(30);
        spin_list_refresh.setMaximum(99999);
        spin_list_refresh.setValue(pref->getRefreshInterval());
        spin_list_refresh.setSuffix(tr(" ms", " milliseconds"));
        setRow(LIST_REFRESH, tr("Transfer list refresh interval"), &spin_list_refresh);
        // Resolve Peer countries
        cb_resolve_countries.setChecked(pref->resolvePeerCountries());
        setRow(RESOLVE_COUNTRIES, tr("Resolve peer countries (GeoIP)"), &cb_resolve_countries);
        // Resolve peer hosts
        cb_resolve_hosts.setChecked(pref->resolvePeerHostNames());
        setRow(RESOLVE_HOSTS, tr("Resolve peer host names"), &cb_resolve_hosts);
        // Max Half Open connections
        spin_maxhalfopen.setMinimum(0);
        spin_maxhalfopen.setMaximum(99999);
        spin_maxhalfopen.setValue(pref->getMaxHalfOpenConnections());
        setRow(MAX_HALF_OPEN, tr("Maximum number of half-open connections [0: Unlimited]"), &spin_maxhalfopen);
        // Super seeding
        cb_super_seeding.setChecked(pref->isSuperSeedingEnabled());
        setRow(SUPER_SEEDING, tr("Strict super seeding"), &cb_super_seeding);
        // Network interface
        combo_iface.addItem(tr("Any interface", "i.e. Any network interface"));
        const QString current_iface = pref->getNetworkInterface();
        bool interface_exists = current_iface.isEmpty();
        int i = 1;
        foreach (const QNetworkInterface& iface, QNetworkInterface::allInterfaces()) {
            if (iface.flags() & QNetworkInterface::IsLoopBack) continue;
            combo_iface.addItem(iface.humanReadableName(),iface.name());
            if (!current_iface.isEmpty() && iface.name() == current_iface) {
                combo_iface.setCurrentIndex(i);
                interface_exists = true;
            }
            ++i;
        }
        // Saved interface does not exist, show it anyway
        if (!interface_exists) {
            combo_iface.addItem(pref->getNetworkInterfaceName(),current_iface);
            combo_iface.setCurrentIndex(i);
        }
        setRow(NETWORK_IFACE, tr("Network Interface (requires restart)"), &combo_iface);
        // Listen on IPv6 address
        cb_listen_ipv6.setChecked(pref->getListenIPv6());
        setRow(NETWORK_LISTEN_IPV6, tr("Listen on IPv6 address (requires restart)"), &cb_listen_ipv6);
        // Network address
        txt_network_address.setText(pref->getNetworkAddress());
        setRow(NETWORK_ADDRESS, tr("IP Address to report to trackers (requires restart)"), &txt_network_address);
        // Program notifications
        cb_program_notifications.setChecked(pref->useProgramNotification());
        setRow(PROGRAM_NOTIFICATIONS, tr("Display program on-screen notifications"), &cb_program_notifications);
        // Tracker State
        cb_tracker_status.setChecked(pref->isTrackerEnabled());
        setRow(TRACKER_STATUS, tr("Enable embedded tracker"), &cb_tracker_status);
        // Tracker port
        spin_tracker_port.setMinimum(1);
        spin_tracker_port.setMaximum(65535);
        spin_tracker_port.setValue(pref->getTrackerPort());
        setRow(TRACKER_PORT, tr("Embedded tracker port"), &spin_tracker_port);
#if defined(Q_OS_WIN) || defined(Q_OS_MAC)
        cb_update_check.setChecked(pref->isUpdateCheckEnabled());
        setRow(UPDATE_CHECK, tr("Check for software updates"), &cb_update_check);
#endif
#if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
        cb_use_icon_theme.setChecked(pref->useSystemIconTheme());
        setRow(USE_ICON_THEME, tr("Use system icon theme"), &cb_use_icon_theme);
#endif
        // Torrent recheck confirmation
        cb_confirm_torrent_recheck.setChecked(pref->confirmTorrentRecheck());
        setRow(CONFIRM_RECHECK_TORRENT, tr("Confirm torrent recheck"), &cb_confirm_torrent_recheck);
        // Tracker exchange
        cb_enable_tracker_ext.setChecked(pref->trackerExchangeEnabled());
        setRow(TRACKER_EXCHANGE, tr("Exchange trackers with other peers"), &cb_enable_tracker_ext);
        // Announce to all trackers
        cb_announce_all_trackers.setChecked(pref->announceToAllTrackers());
        setRow(ANNOUNCE_ALL_TRACKERS, tr("Always announce to all trackers"), &cb_announce_all_trackers);
    }
};

#endif // ADVANCEDSETTINGS_H