/*
 * This file Copyright (C) 2009 Charles Kerr <charles@transmissionbt.com>
 *
 * This file is licensed by the GPL version 2.  Works owned by the
 * Transmission project are granted a special exemption to clause 2(b)
 * so that the bulk of its code can remain under the MIT license.
 * This exemption does not extend to derived works not owned by
 * the Transmission project.
 *
 * $Id:$
 */

#include <cassert>
#include <iostream>

#include <QCoreApplication>
#include <QCheckBox>
#include <QFileDialog>
#include <QComboBox>
#include <QDialogButtonBox>
#include <QDoubleSpinBox>
#include <QHBoxLayout>
#include <QLabel>
#include <QLineEdit>
#include <QFileInfo>
#include <QList>
#include <QPushButton>
#include <QIcon>
#include <QSpinBox>
#include <QStyle>
#include <QTabWidget>
#include <QTime>
#include <QTimeEdit>
#include <QTimer>
#include <QVBoxLayout>
#include <QHttp>
#include <QMessageBox>

#include "hig.h"
#include "prefs.h"
#include "prefs-dialog.h"
#include "qticonloader.h"
#include "session.h"

/***
****
***/

namespace
{
    const char * PREF_KEY( "pref-key" );
};

void
PrefsDialog :: checkBoxToggled( bool checked )
{
    const int key( sender( )->property( PREF_KEY ).toInt( ) );
    myPrefs.set( key, checked );
}

QCheckBox *
PrefsDialog :: checkBoxNew( const QString& text, int key )
{
    QCheckBox * box = new QCheckBox( text );
    box->setChecked( myPrefs.getBool( key ) );
    box->setProperty( PREF_KEY, key );
    connect( box, SIGNAL(toggled(bool)), this, SLOT(checkBoxToggled(bool)));
    myWidgets.insert( key, box );
    return box;
}

void
PrefsDialog :: enableBuddyWhenChecked( QCheckBox * box, QWidget * buddy )
{
    connect( box, SIGNAL(toggled(bool)), buddy, SLOT(setEnabled(bool)) );
    buddy->setEnabled( box->isChecked( ) );
}

void
PrefsDialog :: spinBoxChangedIdle( )
{
    const QObject * spin( sender()->property( "SPIN" ).value<QObject*>( ) );
    const int key( spin->property( PREF_KEY ).toInt( ) );

    const QDoubleSpinBox * d = qobject_cast<const QDoubleSpinBox*>( spin );
    if( d != 0 )
        myPrefs.set( key, d->value( ) );
    else
        myPrefs.set( key, qobject_cast<const QSpinBox*>(spin)->value( ) );
}

void
PrefsDialog :: spinBoxChanged( int value )
{
    Q_UNUSED( value );

    static const QString timerName( "TIMER_CHILD" );
    QObject * o( sender( ) );

    // user may be spinning through many values, so let's hold off
    // for a moment to kekep from flooding a bunch of prefs changes
    QTimer * timer( o->findChild<QTimer*>( timerName ) );
    if( timer == 0 )
    {
        timer = new QTimer( o );
        timer->setObjectName( timerName );
        timer->setSingleShot( true );
        timer->setProperty( "SPIN", qVariantFromValue( o ) );
        connect( timer, SIGNAL(timeout()), this, SLOT(spinBoxChangedIdle()));
    }
    timer->start( 200 );
}

QSpinBox *
PrefsDialog :: spinBoxNew( int key, int low, int high, int step )
{
    QSpinBox * spin = new QSpinBox( );
    spin->setRange( low, high );
    spin->setSingleStep( step );
    spin->setValue( myPrefs.getInt( key ) );
    spin->setProperty( PREF_KEY, key );
    connect( spin, SIGNAL(valueChanged(int)), this, SLOT(spinBoxChanged(int)));
    myWidgets.insert( key, spin );
    return spin;
}

void
PrefsDialog :: doubleSpinBoxChanged( double value )
{
    Q_UNUSED( value );

    spinBoxChanged( 0 );
}

QDoubleSpinBox *
PrefsDialog :: doubleSpinBoxNew( int key, double low, double high, double step, int decimals )
{
    QDoubleSpinBox * spin = new QDoubleSpinBox( );
    spin->setRange( low, high );
    spin->setSingleStep( step );
    spin->setDecimals( decimals );
    spin->setValue( myPrefs.getDouble( key ) );
    spin->setProperty( PREF_KEY, key );
    connect( spin, SIGNAL(valueChanged(double)), this, SLOT(doubleSpinBoxChanged(double)));
    myWidgets.insert( key, spin );
    return spin;
}

void
PrefsDialog :: timeChanged( const QTime& time )
{
    const int key( sender()->property( PREF_KEY ).toInt( ) );
    const int seconds( QTime().secsTo( time ) );
    myPrefs.set( key, seconds / 60 );
}

QTimeEdit*
PrefsDialog :: timeEditNew( int key )
{
    const int minutes( myPrefs.getInt( key ) );
    QTimeEdit * e = new QTimeEdit( );
    e->setDisplayFormat( "hh:mm" );
    e->setProperty( PREF_KEY, key );
    e->setTime( QTime().addSecs( minutes * 60 ) );
    myWidgets.insert( key, e );
    connect( e, SIGNAL(timeChanged(const QTime&)), this, SLOT(timeChanged(const QTime&)) );
    return e;
}

void
PrefsDialog :: textChanged( const QString& text )
{
    const int key( sender()->property( PREF_KEY ).toInt( ) );
    myPrefs.set( key, text );
}

QLineEdit*
PrefsDialog :: lineEditNew( int key, int echoMode )
{
    QLineEdit * e = new QLineEdit( myPrefs.getString( key ) );
    e->setProperty( PREF_KEY, key );
    e->setEchoMode( QLineEdit::EchoMode( echoMode ) );
    myWidgets.insert( key, e );
    connect( e, SIGNAL(textChanged(const QString&)), this, SLOT(textChanged(const QString&)) );
    return e;
}

/***
****
***/

QWidget *
PrefsDialog :: createTrackerTab( )
{
    QWidget *l, *r;
    HIG * hig = new HIG( );
    hig->addSectionTitle( tr( "Tracker Proxy" ) );
    hig->addWideControl( l = checkBoxNew( tr( "Connect to tracker via a pro&xy" ), Prefs::PROXY_ENABLED ) );
    myUnsupportedWhenRemote << l;
    l = hig->addRow( tr( "Proxy &server:" ), r = lineEditNew( Prefs::PROXY ) );
    myProxyWidgets << l << r;
    l = hig->addRow( tr( "Proxy &port:" ), r = spinBoxNew( Prefs::PROXY_PORT, 1, 65535, 1 ) );
    myProxyWidgets << l << r;
    hig->addWideControl( l = checkBoxNew( tr( "Require &authentication" ), Prefs::PROXY_AUTH_ENABLED ) );
    myProxyWidgets << l;
    l = hig->addRow( tr( "&Username:" ), r = lineEditNew( Prefs::PROXY_USERNAME ) );
    myProxyAuthWidgets << l << r;
    l = hig->addRow( tr( "Pass&word:" ), r = lineEditNew( Prefs::PROXY_PASSWORD, QLineEdit::Password ) );
    myProxyAuthWidgets << l << r;
    myUnsupportedWhenRemote << myProxyAuthWidgets;
    hig->finish( );
    return hig;
}

/***
****
***/

QWidget *
PrefsDialog :: createWebTab( Session& session )
{
    HIG * hig = new HIG( this );
    hig->addSectionTitle( tr( "Web Interface" ) );
    QWidget * w;
    QHBoxLayout * h = new QHBoxLayout( );
    QIcon i( style()->standardIcon( QStyle::StandardPixmap( QStyle::SP_DirOpenIcon ) ) );
    QPushButton * b = new QPushButton( i, tr( "&Open web interface" ) );
    connect( b, SIGNAL(clicked()), &session, SLOT(launchWebInterface()) );
    h->addWidget( b, 0, Qt::AlignRight );
    QWidget * l = checkBoxNew( tr( "&Enable web interface" ), Prefs::RPC_ENABLED );
    myUnsupportedWhenRemote << l;
    hig->addRow( l, h, 0 );
    l = hig->addRow( tr( "Listening &port:" ), w = spinBoxNew( Prefs::RPC_PORT, 0, 65535, 1 ) );
    myWebWidgets << l << w;
    hig->addWideControl( w = checkBoxNew( tr( "&Require username" ), Prefs::RPC_AUTH_REQUIRED ) );
    myWebWidgets << w;
    l = hig->addRow( tr( "&Username:" ), w = lineEditNew( Prefs::RPC_USERNAME ) );
    myWebAuthWidgets << l << w;
    l = hig->addRow( tr( "Pass&word:" ), w = lineEditNew( Prefs::RPC_PASSWORD, QLineEdit::Password ) );
    myWebAuthWidgets << l << w;
    hig->addWideControl( w = checkBoxNew( tr( "Only allow the following IP &addresses to connect:" ), Prefs::RPC_WHITELIST_ENABLED ) );
    myWebWidgets << w;
    l = hig->addRow( tr( "Addresses:" ), w = lineEditNew( Prefs::RPC_WHITELIST ) );
    myWebWhitelistWidgets << l << w;
    myUnsupportedWhenRemote << myWebWidgets << myWebAuthWidgets << myWebWhitelistWidgets;
    hig->finish( );
    return hig;
}

/***
****
***/

void
PrefsDialog :: altSpeedDaysEdited( int i )
{
    const int value = qobject_cast<QComboBox*>(sender())->itemData(i).toInt();
    myPrefs.set( Prefs::ALT_SPEED_LIMIT_TIME_DAY, value );
}


QWidget *
PrefsDialog :: createBandwidthTab( )
{
    QWidget *l, *r;
    HIG * hig = new HIG( this );
    hig->addSectionTitle( tr( "Global Bandwidth Limits" ) );

        l = checkBoxNew( tr( "Limit &download speed (KB/s):" ), Prefs::DSPEED_ENABLED );
        r = spinBoxNew( Prefs::DSPEED, 0, INT_MAX, 5 );
        hig->addRow( l, r );
        enableBuddyWhenChecked( qobject_cast<QCheckBox*>(l), r );

        l = checkBoxNew( tr( "Limit &upload speed (KB/s):" ), Prefs::USPEED_ENABLED );
        r = spinBoxNew( Prefs::USPEED, 0, INT_MAX, 5 );
        hig->addRow( l, r );
        enableBuddyWhenChecked( qobject_cast<QCheckBox*>(l), r );

    hig->addSectionDivider( );
    QHBoxLayout * h = new QHBoxLayout;
    h->setSpacing( HIG :: PAD );
    QLabel * label = new QLabel;
    label->setPixmap( QPixmap( ":/icons/alt-limit-off.png" ) );
    label->setAlignment( Qt::AlignLeft|Qt::AlignVCenter );
    h->addWidget( label );
    label = new QLabel( tr( "Speed Limit Mode" ) );
    label->setStyleSheet( "font: bold" );
    label->setAlignment( Qt::AlignLeft|Qt::AlignVCenter );
    h->addWidget( label );
    hig->addSectionTitle( h );

        QString s = tr( "Limit d&ownload speed (KB/s):" );
        r = spinBoxNew( Prefs :: ALT_SPEED_LIMIT_DOWN, 0, INT_MAX, 5 );
        hig->addRow( s, r );

        s = tr( "Limit u&pload speed (KB/s):" );
        r = spinBoxNew( Prefs :: ALT_SPEED_LIMIT_UP, 0, INT_MAX, 5 );
        hig->addRow( s, r );

        s = tr( "<small>When enabled, Speed Limit Mode overrides the Global Bandwidth Limits</small>" );
        hig->addWideControl( new QLabel( s ) );

        QCheckBox * c = checkBoxNew( tr( "Use Speed Limit Mode &between" ), Prefs::ALT_SPEED_LIMIT_TIME_ENABLED );
        h = new QHBoxLayout( );
        h->setSpacing( HIG::PAD );
        QWidget * w = timeEditNew( Prefs :: ALT_SPEED_LIMIT_TIME_BEGIN );
        h->addWidget( w, 1 );
        mySchedWidgets << w;
        w = new QLabel( "and" );
        h->addWidget( w );
        mySchedWidgets << w;
        w = timeEditNew( Prefs :: ALT_SPEED_LIMIT_TIME_END );
        h->addWidget( w, 1 );
        mySchedWidgets << w;
        hig->addRow( c, h, 0 );

        s = tr( "&On days:" );
        QComboBox * box = new QComboBox;
        const QIcon noIcon;
        box->addItem( noIcon, tr( "Every Day" ), QVariant( TR_SCHED_ALL ) );
        box->addItem( noIcon, tr( "Weekdays" ),  QVariant( TR_SCHED_WEEKDAY ) );
        box->addItem( noIcon, tr( "Weekends" ),  QVariant( TR_SCHED_WEEKEND ) );
        box->addItem( noIcon, tr( "Sunday" ),    QVariant( TR_SCHED_SUN ) );
        box->addItem( noIcon, tr( "Monday" ),    QVariant( TR_SCHED_MON ) );
        box->addItem( noIcon, tr( "Tuesday" ),   QVariant( TR_SCHED_TUES ) );
        box->addItem( noIcon, tr( "Wednesday" ), QVariant( TR_SCHED_WED ) );
        box->addItem( noIcon, tr( "Thursday" ),  QVariant( TR_SCHED_THURS ) );
        box->addItem( noIcon, tr( "Friday" ),    QVariant( TR_SCHED_FRI ) );
        box->addItem( noIcon, tr( "Saturday" ),  QVariant( TR_SCHED_SAT ) );
        box->setCurrentIndex( box->findData( myPrefs.getInt( Prefs :: ALT_SPEED_LIMIT_TIME_DAY ) ) );
        connect( box, SIGNAL(activated(int)), this, SLOT(altSpeedDaysEdited(int)) );
        w = hig->addRow( s, box );
        mySchedWidgets << w << box;

    hig->finish( );
    return hig;
}

/***
****
***/

void
PrefsDialog :: onPortTested( bool isOpen )
{
    myPortButton->setEnabled( true );
    myWidgets[Prefs::PEER_PORT]->setEnabled( true );
    myPortLabel->setText( isOpen ? tr( "Port is <b>open</b>" )
                                 : tr( "Port is <b>closed</b>" ) );
}

void
PrefsDialog :: onPortTest( )
{
    myPortLabel->setText( tr( "Testing..." ) );
    myPortButton->setEnabled( false );
    myWidgets[Prefs::PEER_PORT]->setEnabled( false );
    mySession.portTest( );
}

QWidget *
PrefsDialog :: createNetworkTab( )
{
    HIG * hig = new HIG( this );
    hig->addSectionTitle( tr( "Incoming Peers" ) );

        QSpinBox * s = spinBoxNew( Prefs::PEER_PORT, 1, 65535, 1 );
        QHBoxLayout * h = new QHBoxLayout( );
        QPushButton * b = myPortButton = new QPushButton( tr( "&Test Port" ) );
        QLabel * l = myPortLabel = new QLabel( tr( "Status unknown" ) );
        h->addWidget( l );
        h->addSpacing( HIG :: PAD_BIG );
        h->addWidget( b );
        h->setStretchFactor( l, 1 );
        connect( b, SIGNAL(clicked(bool)), this, SLOT(onPortTest()));
        connect( &mySession, SIGNAL(portTested(bool)), this, SLOT(onPortTested(bool)));

        hig->addRow( tr( "&Port for incoming connections:" ), s );
        hig->addRow( "", h, 0 );
        hig->addWideControl( checkBoxNew( tr( "Randomize the port every launch" ), Prefs :: PEER_PORT_RANDOM_ON_START ) );
        hig->addWideControl( checkBoxNew( tr( "Use UPnP or NAT-PMP port &forwarding from my router" ), Prefs::PORT_FORWARDING ) );

    hig->finish( );
    return hig;
}

/***
****
***/

void
PrefsDialog :: onBlocklistDialogDestroyed( QObject * o )
{
    Q_UNUSED( o );

    myBlocklistDialog = 0;
}

void
PrefsDialog :: onUpdateBlocklistCancelled( )
{
    disconnect( &mySession, SIGNAL(blocklistUpdated(int)), this, SLOT(onBlocklistUpdated(int))) ;
    myBlocklistDialog->deleteLater( );
}

void
PrefsDialog :: onBlocklistUpdated( int n )
{
    myBlocklistDialog->setText( tr( "<b>Update succeeded!</b><p>Blocklist now has %Ln rules.", 0, n ) );
    myBlocklistDialog->setTextFormat( Qt::RichText );
}

void
PrefsDialog :: onUpdateBlocklistClicked( )
{
    myBlocklistDialog = new QMessageBox( QMessageBox::Information,
                                         "",
                                         tr( "<b>Update Blocklist</b><p>Getting new blocklist..." ),
                                         QMessageBox::Close,
                                         this );
    QPixmap pixmap;
    QIcon icon = QtIconLoader :: icon( "dialog-information" );
    if( !icon.isNull( ) ) {
        const int size = style()->pixelMetric( QStyle::PM_LargeIconSize );
        myBlocklistDialog->setIconPixmap( icon.pixmap( size, size ) );
    }
    connect( myBlocklistDialog, SIGNAL(rejected()), this, SLOT(onUpdateBlocklistCancelled()) );
    connect( &mySession, SIGNAL(blocklistUpdated(int)), this, SLOT(onBlocklistUpdated(int))) ;
    myBlocklistDialog->show( );
    mySession.updateBlocklist( );
}
    
void
PrefsDialog :: encryptionEdited( int i )
{
    const int value( qobject_cast<QComboBox*>(sender())->itemData(i).toInt( ) );
    myPrefs.set( Prefs::ENCRYPTION, value );
}

QWidget *
PrefsDialog :: createPeersTab( )
{
    HIG * hig = new HIG( this );
    hig->addSectionTitle( tr( "Blocklist" ) );
    QHBoxLayout * h = new QHBoxLayout( );
    QIcon i( style()->standardIcon( QStyle::StandardPixmap( QStyle::SP_BrowserReload ) ) );
    QPushButton * w = new QPushButton( i, tr( "&Update blocklist" ) );
    connect( w, SIGNAL(clicked(bool)), this, SLOT(onUpdateBlocklistClicked()));
    myBlockWidgets << w;
    QWidget * l = checkBoxNew( "", Prefs::BLOCKLIST_ENABLED );
    h->addWidget( l );
    h->addStretch( 1 );
    h->addWidget( w );
    hig->addWideControl( h );
    l = checkBoxNew( tr( "Enable &automatic updates" ), Prefs::BLOCKLIST_UPDATES_ENABLED );
    myBlockWidgets << l;
    hig->addWideControl( l );

    hig->addSectionDivider( );
    hig->addSectionTitle( tr( "Limits" ) );
    hig->addRow( tr( "Maximum peers &overall:" ), spinBoxNew( Prefs::PEER_LIMIT_GLOBAL, 1, 3000, 5 ) );
    hig->addRow( tr( "Maximum peers per &torrent:" ), spinBoxNew( Prefs::PEER_LIMIT_TORRENT, 1, 300, 5 ) );

    QComboBox * box = new QComboBox( );
    box->addItem( tr( "Plaintext Preferred" ), 0 );
    box->addItem( tr( "Encryption Preferred" ), 1 );
    box->addItem( tr( "Encryption Required" ), 2 );
    myWidgets.insert( Prefs :: ENCRYPTION, box );
    connect( box, SIGNAL(activated(int)), this, SLOT(encryptionEdited(int)));

    hig->addSectionDivider( );
    hig->addSectionTitle( tr( "Privacy" ) );
    hig->addRow( tr( "Encryption &mode:" ), box );
    hig->addWideControl( checkBoxNew( tr( "Use peer e&xchange" ), Prefs::PEX_ENABLED ) );

    hig->finish( );
    updateBlocklistCheckBox( );
    return hig;
}

/***
****
***/

void
PrefsDialog :: onWatchClicked( void )
{
    QFileDialog * d = new QFileDialog( this,
                                       tr( "Select Watch Directory" ),
                                       myPrefs.getString( Prefs::DIR_WATCH ) );
    d->setFileMode( QFileDialog::Directory );
    connect( d, SIGNAL(filesSelected(const QStringList&)), this, SLOT(onWatchSelected(const QStringList&)) );
    d->show( );
}

void
PrefsDialog :: onWatchSelected( const QStringList& list )
{
    if( list.size() == 1 )
        myPrefs.set( Prefs::DIR_WATCH, list.first( ) );
}

void
PrefsDialog :: onDestinationClicked( void )
{
    QFileDialog * d = new QFileDialog( this,
                                       tr( "Select Destination" ),
                                       myPrefs.getString( Prefs::DOWNLOAD_DIR ) );
    d->setFileMode( QFileDialog::Directory );
    connect( d, SIGNAL(filesSelected(const QStringList&)), this, SLOT(onDestinationSelected(const QStringList&)) );
    d->show( );
}

void
PrefsDialog :: onDestinationSelected( const QStringList& list )
{
    if( list.size() == 1 )
        myPrefs.set( Prefs::DOWNLOAD_DIR, list.first( ) );
}

QWidget *
PrefsDialog :: createTorrentsTab( )
{
    const int iconSize( style( )->pixelMetric( QStyle :: PM_SmallIconSize ) );
    const QIcon folderIcon = QtIconLoader :: icon( "folder", style()->standardIcon( QStyle::SP_DirIcon ) );
    const QPixmap folderPixmap = folderIcon.pixmap( iconSize );

    QWidget *l, *r;
    HIG * hig = new HIG( this );
    hig->addSectionTitle( tr( "Adding Torrents" ) );

        l = checkBoxNew( tr( "Automatically &add torrents from:" ), Prefs::DIR_WATCH_ENABLED );
        QPushButton * b = myWatchButton = new QPushButton;
        b->setIcon( folderPixmap );
        b->setStyleSheet( "text-align: left; padding-left: 5; padding-right: 5" );
        connect( b, SIGNAL(clicked(bool)), this, SLOT(onWatchClicked(void)) );
        hig->addRow( l, b );
        enableBuddyWhenChecked( qobject_cast<QCheckBox*>(l), b );

        hig->addWideControl( checkBoxNew( tr( "Display &options dialog" ), Prefs::OPTIONS_PROMPT ) );
        hig->addWideControl( checkBoxNew( tr( "&Start when added" ), Prefs::START ) );
        hig->addWideControl( checkBoxNew( tr( "Mo&ve source files to Trash" ), Prefs::TRASH_ORIGINAL ) );

        b = myDestinationButton = new QPushButton;
        b->setIcon( folderPixmap );
        b->setStyleSheet( "text-align: left; padding-left: 5; padding-right: 5" );
        connect( b, SIGNAL(clicked(bool)), this, SLOT(onDestinationClicked(void)) );
        hig->addRow( tr( "&Destination folder:" ), b );

    hig->addSectionDivider( );
    hig->addSectionTitle( tr( "Limits" ) );

        l = checkBoxNew( tr( "&Stop seeding torrents at ratio:" ), Prefs::RATIO_ENABLED );
        r = doubleSpinBoxNew( Prefs::RATIO, 0, INT_MAX, 0.5, 2 );
        hig->addRow( l, r );
        enableBuddyWhenChecked( qobject_cast<QCheckBox*>(l), r );

    hig->finish( );
    return hig;
}

/***
****
***/

PrefsDialog :: PrefsDialog( Session& session, Prefs& prefs, QWidget * parent ):
    QDialog( parent ),
    myIsServer( session.isServer( ) ),
    mySession( session ),
    myPrefs( prefs ),
    myLayout( new QVBoxLayout( this ) )
{
    setWindowTitle( tr( "Transmission Preferences" ) );

    QTabWidget * t = new QTabWidget( this );
    t->addTab( createTorrentsTab( ),       tr( "Torrents" ) );
    t->addTab( createPeersTab( ),          tr( "Peers" ) );
    t->addTab( createBandwidthTab( ),      tr( "Speed" ) );
    t->addTab( createNetworkTab( ),        tr( "Network" ) );
    t->addTab( createWebTab( session ),    tr( "Web" ) );
    //t->addTab( createTrackerTab( ),        tr( "Trackers" ) );
    myLayout->addWidget( t );

    QDialogButtonBox * buttons = new QDialogButtonBox( QDialogButtonBox::Close, Qt::Horizontal, this );
    connect( buttons, SIGNAL(rejected()), this, SLOT(hide()) ); // "close" triggers rejected
    myLayout->addWidget( buttons );

    connect( &myPrefs, SIGNAL(changed(int)), this, SLOT(updatePref(int)));
    connect( &mySession, SIGNAL(sessionUpdated()), this, SLOT(sessionUpdated()));

    QList<int> keys;
    keys << Prefs :: RPC_ENABLED
         << Prefs :: PROXY_ENABLED
         << Prefs :: ALT_SPEED_LIMIT_ENABLED
         << Prefs :: ALT_SPEED_LIMIT_TIME_ENABLED
         << Prefs :: ENCRYPTION
         << Prefs :: BLOCKLIST_ENABLED
         << Prefs :: DIR_WATCH
         << Prefs :: DOWNLOAD_DIR;
    foreach( int key, keys )
        updatePref( key );

    // if it's a remote session, disable the preferences
    // that don't work in remote sessions
    if( !myIsServer )  {
        foreach( QWidget * w, myUnsupportedWhenRemote ) {
            w->setToolTip( tr( "Not supported by remote sessions" ) );
            w->setEnabled( false );
        }
    }
}

PrefsDialog :: ~PrefsDialog( )
{
}

/***
****
***/

void
PrefsDialog :: sessionUpdated( )
{
    updateBlocklistCheckBox( );
}

void
PrefsDialog :: updateBlocklistCheckBox( )
{
    QCheckBox * box = qobject_cast<QCheckBox*>( myWidgets[Prefs::BLOCKLIST_ENABLED] );
    const int n = mySession.blocklistSize( );
    if( n < 0 ) // unknown
        box->setText( tr( "Enable &blocklist" ) );
    else
        box->setText( tr( "Enable &blocklist (%Ln rules)", 0, n ) );
}

void
PrefsDialog :: updatePref( int key )
{
    switch( key )
    {
        case Prefs :: RPC_ENABLED:
        case Prefs :: RPC_WHITELIST_ENABLED:
        case Prefs :: RPC_AUTH_REQUIRED: {
            const bool enabled( myPrefs.getBool( Prefs::RPC_ENABLED ) );
            const bool whitelist( myPrefs.getBool( Prefs::RPC_WHITELIST_ENABLED ) );
            const bool auth( myPrefs.getBool( Prefs::RPC_AUTH_REQUIRED ) );
            foreach( QWidget * w, myWebWhitelistWidgets ) w->setEnabled( enabled && whitelist ); 
            foreach( QWidget * w, myWebAuthWidgets ) w->setEnabled( enabled && auth ); 
            foreach( QWidget * w, myWebWidgets ) w->setEnabled( enabled );
            break;
        }

        case Prefs :: PROXY_ENABLED:
        case Prefs :: PROXY_AUTH_ENABLED: {
            const bool enabled( myPrefs.getBool( Prefs::PROXY_ENABLED ) );
            const bool auth( myPrefs.getBool( Prefs::PROXY_AUTH_ENABLED ) );
            foreach( QWidget * w, myProxyAuthWidgets ) w->setEnabled( enabled && auth ); 
            foreach( QWidget * w, myProxyWidgets ) w->setEnabled( enabled );
            break;
        }

        case Prefs :: ALT_SPEED_LIMIT_TIME_ENABLED: {
            const bool enabled = myPrefs.getBool( key );
            foreach( QWidget * w, mySchedWidgets ) w->setEnabled( enabled );
            break;
        }

        case Prefs :: BLOCKLIST_ENABLED: {
            const bool enabled = myPrefs.getBool( key );
            foreach( QWidget * w, myBlockWidgets ) w->setEnabled( enabled );
            break;
        }

        case Prefs :: DIR_WATCH:
            myWatchButton->setText( QFileInfo(myPrefs.getString(Prefs::DIR_WATCH)).fileName() );
            break;

        case Prefs :: PEER_PORT:
            myPortLabel->setText( tr( "Status unknown" ) );
            myPortButton->setEnabled( true );
            break;

        case Prefs :: DOWNLOAD_DIR: {
            QString path( myPrefs.getString( Prefs :: DOWNLOAD_DIR ) );
            myDestinationButton->setText( QFileInfo(path).fileName() );
            break;
        }

        default:
            break;
    }

    key2widget_t::iterator it( myWidgets.find( key ) );
    if( it != myWidgets.end( ) )
    {
        QWidget * w( it.value( ) );
        QCheckBox * checkBox;
        QSpinBox * spin;
        QDoubleSpinBox * doubleSpin;
        QTimeEdit * timeEdit;
        QLineEdit * lineEdit;

        if(( checkBox = qobject_cast<QCheckBox*>(w)))
        {
            checkBox->setChecked( myPrefs.getBool( key ) );
        }
        else if(( spin = qobject_cast<QSpinBox*>(w)))
        {
            spin->setValue( myPrefs.getInt( key ) );
        }
        else if(( doubleSpin = qobject_cast<QDoubleSpinBox*>(w)))
        {
            doubleSpin->setValue( myPrefs.getDouble( key ) );
        }
        else if(( timeEdit = qobject_cast<QTimeEdit*>(w)))
        {
            const int minutes( myPrefs.getInt( key ) );
            timeEdit->setTime( QTime().addSecs( minutes * 60 ) );
        }
        else if(( lineEdit = qobject_cast<QLineEdit*>(w)))
        {
            lineEdit->setText( myPrefs.getString( key ) );
        }
        else if( key == Prefs::ENCRYPTION )
        {
            QComboBox * comboBox( qobject_cast<QComboBox*>( w ) );
            const int index = comboBox->findData( myPrefs.getInt( key ) );
            comboBox->setCurrentIndex( index );
        }
    }
}

bool
PrefsDialog :: isAllowed( int key ) const
{
    Q_UNUSED( key );

    return true;
}