/*
 * This file Copyright (C) Mnemosyne LLC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * $Id$
 */

#include <cassert>
#include <ctime>

#include <QCheckBox>
#include <QComboBox>
#include <QDateTime>
#include <QDialogButtonBox>
#include <QDoubleSpinBox>
#include <QEvent>
#include <QFont>
#include <QFontMetrics>
#include <QHBoxLayout>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QInputDialog>
#include <QItemSelectionModel>
#include <QLabel>
#include <QList>
#include <QMap>
#include <QMessageBox>
#include <QPushButton>
#include <QRadioButton>
#include <QResizeEvent>
#include <QSpinBox>
#include <QStringList>
#include <QStyle>
#include <QTabWidget>
#include <QTextBrowser>
#include <QTreeView>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QVBoxLayout>

#include <libtransmission/transmission.h>
#include <libtransmission/utils.h> // tr_getRatio()

#include "details.h"
#include "file-tree.h"
#include "formatter.h"
#include "hig.h"
#include "prefs.h"
#include "session.h"
#include "squeezelabel.h"
#include "torrent.h"
#include "torrent-model.h"
#include "tracker-delegate.h"
#include "tracker-model.h"
#include "tracker-model-filter.h"

class Prefs;
class Session;

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

namespace
{
    const int REFRESH_INTERVAL_MSEC = 4000;

    const char * PREF_KEY( "pref-key" );

    enum // peer columns
    {
        COL_LOCK,
        COL_UP,
        COL_DOWN,
        COL_PERCENT,
        COL_STATUS,
        COL_ADDRESS,
        COL_CLIENT,
        N_COLUMNS
    };
}

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

class PeerItem: public QTreeWidgetItem
{
        Peer peer;
        QString collatedAddress;
        QString status;

    public:
        virtual ~PeerItem( ) { }
        PeerItem( const Peer& p ) {
            peer = p;
            int q[4];
            if( sscanf( p.address.toUtf8().constData(), "%d.%d.%d.%d", q+0, q+1, q+2, q+3 ) == 4 )
                collatedAddress.sprintf( "%03d.%03d.%03d.%03d", q[0], q[1], q[2], q[3] );
            else
                collatedAddress = p.address;
        }
    public:
        void refresh( const Peer& p ) { peer = p; }
        void setStatus( const QString& s ) { status = s; }
        virtual bool operator< ( const QTreeWidgetItem & other ) const {
            const PeerItem * i = dynamic_cast<const PeerItem*>(&other);
            QTreeWidget * tw( treeWidget( ) );
            const int column = tw ? tw->sortColumn() : 0;
            switch( column ) {
                case COL_UP: return peer.rateToPeer < i->peer.rateToPeer;
                case COL_DOWN: return peer.rateToClient < i->peer.rateToClient;
                case COL_PERCENT: return peer.progress < i->peer.progress;
                case COL_STATUS: return status < i->status;
                case COL_CLIENT: return peer.clientName < i->peer.clientName;
                case COL_LOCK: return peer.isEncrypted && !i->peer.isEncrypted;
                default: return collatedAddress < i->collatedAddress;
            }
        }
};

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

QIcon
Details :: getStockIcon( const QString& freedesktop_name, int fallback )
{
    QIcon icon = QIcon::fromTheme( freedesktop_name );

    if( icon.isNull( ) )
        icon = style()->standardIcon( QStyle::StandardPixmap( fallback ), 0, this );

    return icon;
}

Details :: Details( Session& session, Prefs& prefs, TorrentModel& model, QWidget * parent ):
    QDialog( parent, Qt::Dialog ),
    mySession( session ),
    myPrefs( prefs ),
    myModel( model ),
    myChangedTorrents( false ),
    myHavePendingRefresh( false )
{
    QVBoxLayout * layout = new QVBoxLayout( this );

    setWindowTitle( tr( "Torrent Properties" ) );

    QTabWidget * t = new QTabWidget( this );
    QWidget * w;
    t->addTab( w = createInfoTab( ),      tr( "Information" ) );
    myWidgets << w;
    t->addTab( w = createPeersTab( ),     tr( "Peers" ) );
    myWidgets << w;
    t->addTab( w = createTrackerTab( ),   tr( "Tracker" ) );
    myWidgets << w;
    t->addTab( w = createFilesTab( ),     tr( "Files" ) );
    myWidgets << w;
    t->addTab( w = createOptionsTab( ),   tr( "Options" ) );
    myWidgets << w;
    layout->addWidget( t );

    QDialogButtonBox * buttons = new QDialogButtonBox( QDialogButtonBox::Close, Qt::Horizontal, this );
    connect( buttons, SIGNAL(rejected()), this, SLOT(close()));
    layout->addWidget( buttons );
    QWidget::setAttribute( Qt::WA_DeleteOnClose, true );

    QList<int> initKeys;
    initKeys << Prefs :: SHOW_TRACKER_SCRAPES
             << Prefs :: SHOW_BACKUP_TRACKERS;
    foreach( int key, initKeys )
        refreshPref( key );

    connect( &myTimer, SIGNAL(timeout()), this, SLOT(onTimer()));
    connect( &myPrefs, SIGNAL(changed(int)), this, SLOT(refreshPref(int)) );

    onTimer( );
    myTimer.setSingleShot( false );
    myTimer.start( REFRESH_INTERVAL_MSEC );
}

Details :: ~Details( )
{
    myTrackerDelegate->deleteLater();
    myTrackerFilter->deleteLater();
    myTrackerModel->deleteLater();
}

void
Details :: setIds( const QSet<int>& ids )
{
    if( ids == myIds )
        return;

    myChangedTorrents = true;

    // stop listening to the old torrents
    foreach( int id, myIds ) {
        const Torrent * tor = myModel.getTorrentFromId( id );
        if( tor ) {
            disconnect( tor, SIGNAL(torrentChanged(int)), this, SLOT(onTorrentChanged()) );
            disconnect( tor, SIGNAL(torrentFileListRebuilt(int)), this, SLOT(onTorrentFileListRebuilt()) );
        }
    }

    myFileTreeView->clear( );
    myIds = ids;
    myTrackerModel->refresh( myModel, myIds );

    // listen to the new torrents
    foreach( int id, myIds ) {
        const Torrent * tor = myModel.getTorrentFromId( id );
        if( tor ) {
            connect( tor, SIGNAL(torrentChanged(int)), this, SLOT(onTorrentChanged()) );
            connect( tor, SIGNAL(torrentFileListRebuilt(int)), this, SLOT(onTorrentFileListRebuilt()) );
        }
    }

    foreach( QWidget * w, myWidgets )
        w->setEnabled( false );

    onTimer( );
}

void
Details :: refreshPref( int key )
{
    QString str;

    switch( key )
    {
        case Prefs :: SHOW_TRACKER_SCRAPES: {
            QItemSelectionModel * selectionModel( myTrackerView->selectionModel( ) );
            const QItemSelection selection( selectionModel->selection( ) );
            const QModelIndex currentIndex( selectionModel->currentIndex( ) );
            myTrackerDelegate->setShowMore( myPrefs.getBool( key ) );
            selectionModel->clear( );
            myTrackerView->reset( );
            selectionModel->select( selection, QItemSelectionModel::Select );
            selectionModel->setCurrentIndex( currentIndex, QItemSelectionModel::NoUpdate );
            break;
        }

        case Prefs :: SHOW_BACKUP_TRACKERS:
            myTrackerFilter->setShowBackupTrackers( myPrefs.getBool( key ) );
            break;

        default:
            break;
    }
}


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

QString
Details :: timeToStringRounded( int seconds )
{
    if( seconds > 60 ) seconds -= ( seconds % 60 );
    return Formatter::timeToString ( seconds );
}

void
Details :: onTimer( )
{
    getNewData( );
}

void
Details :: getNewData( )
{
    if( !myIds.empty( ) )
    {
        QSet<int> infos;
        foreach( int id, myIds ) {
            const Torrent * tor = myModel.getTorrentFromId( id );
            if( tor->isMagnet() )
                infos.insert( tor->id() );
        }
        if( !infos.isEmpty() )
            mySession.initTorrents( infos );
        mySession.refreshExtraStats( myIds );
    }
}

void
Details :: onTorrentChanged( )
{
    if( !myHavePendingRefresh ) {
        myHavePendingRefresh = true;
        QTimer::singleShot( 100, this, SLOT(refresh()));
    }
}

void
Details :: onTorrentFileListRebuilt( )
{
  myFilesDirty = true;
  onTorrentChanged( );
}

namespace
{
    void setIfIdle( QComboBox * box, int i )
    {
        if( !box->hasFocus( ) )
        {
            box->blockSignals( true );
            box->setCurrentIndex( i );
            box->blockSignals( false );
        }
    }

    void setIfIdle( QDoubleSpinBox * spin, double value )
    {
        if( !spin->hasFocus( ) )
        {
            spin->blockSignals( true );
            spin->setValue( value );
            spin->blockSignals( false );
        }
    }

    void setIfIdle( QSpinBox * spin, int value )
    {
        if( !spin->hasFocus( ) )
        {
            spin->blockSignals( true );
            spin->setValue( value );
            spin->blockSignals( false );
        }
    }
}

void
Details :: refresh( )
{
    const int n = myIds.size( );
    const bool single = n == 1;
    const QString blank;
    const QFontMetrics fm( fontMetrics( ) );
    QList<const Torrent*> torrents;
    QString string;
    const QString none = tr( "None" );
    const QString mixed = tr( "Mixed" );
    const QString unknown = tr( "Unknown" );

    // build a list of torrents
    foreach( int id, myIds ) {
        const Torrent * tor = myModel.getTorrentFromId( id );
        if( tor )
            torrents << tor;
    }

    ///
    ///  activity tab
    ///

    // myStateLabel
    if( torrents.empty( ) )
        string = none;
    else {
        bool isMixed = false;
        bool allPaused = true;
        bool allFinished = true;
        const tr_torrent_activity baseline = torrents[0]->getActivity( );
        foreach( const Torrent * t, torrents ) {
            const tr_torrent_activity activity = t->getActivity( );
            if( activity != baseline )
                isMixed = true;
            if( activity != TR_STATUS_STOPPED )
                allPaused = allFinished = false;
            if( !t->isFinished( ) )
                allFinished = false;
        }
        if( isMixed )
            string = mixed;
        else if( allFinished )
            string = tr( "Finished" );
        else if( allPaused )
            string = tr( "Paused" );
        else
            string = torrents[0]->activityString( );
    }
    myStateLabel->setText( string );
    const QString stateString = string;

    // myHaveLabel
    double sizeWhenDone = 0;
    double leftUntilDone = 0;
    double available = 0;
    int64_t haveTotal = 0;
    int64_t haveVerified = 0;
    int64_t haveUnverified = 0;
    int64_t verifiedPieces = 0;
    if( torrents.empty( ) )
        string = none;
    else {
        foreach( const Torrent * t, torrents ) {
            if( t->hasMetadata( ) ) {
                haveTotal += t->haveTotal( );
                haveUnverified += t->haveUnverified( );
                const uint64_t v = t->haveVerified( );
                haveVerified += v;
                if( t->pieceSize( ) )
                    verifiedPieces += v / t->pieceSize( );
                sizeWhenDone += t->sizeWhenDone( );
                leftUntilDone += t->leftUntilDone( );
                available += t->sizeWhenDone() - t->leftUntilDone() + t->desiredAvailable();
            }
        }
        {
            const double d = 100.0 * ( sizeWhenDone ? ( sizeWhenDone - leftUntilDone ) / sizeWhenDone : 1 );
            QString pct = Formatter::percentToString( d );

            if( !haveUnverified && !leftUntilDone )
            {
                string = tr( "%1 (100%)" )
                             .arg( Formatter::sizeToString( haveVerified ) );
            }
            else if( !haveUnverified )
            {
                string = tr( "%1 of %2 (%3%)" )
                             .arg( Formatter::sizeToString( haveVerified ) )
                             .arg( Formatter::sizeToString( sizeWhenDone ) )
                             .arg( pct );
            }
            else
            {
                string = tr( "%1 of %2 (%3%), %4 Unverified" )
                             .arg( Formatter::sizeToString( haveVerified + haveUnverified ) )
                             .arg( Formatter::sizeToString( sizeWhenDone ) )
                             .arg( pct )
                             .arg( Formatter::sizeToString( haveUnverified ) );
            }
        }
    }
    myHaveLabel->setText( string );

    // myAvailabilityLabel
    if( torrents.empty( ) )
        string = none;
    else {
        if( sizeWhenDone == 0 )
            string = none;
        else
            string = QString( "%1%" ).arg( Formatter::percentToString( ( 100.0 * available ) / sizeWhenDone ) );
    }
    myAvailabilityLabel->setText( string );

    // myDownloadedLabel
    if( torrents.empty( ) )
        string = none;
    else {
        uint64_t d = 0;
        uint64_t f = 0;
        foreach( const Torrent * t, torrents ) {
            d += t->downloadedEver( );
            f += t->failedEver( );
        }
        const QString dstr = Formatter::sizeToString( d );
        const QString fstr = Formatter::sizeToString( f );
        if( f )
            string = tr( "%1 (%2 corrupt)" ).arg( dstr ).arg( fstr );
        else
            string = dstr;
    }
    myDownloadedLabel->setText( string );

    if( torrents.empty( ) )
        string = none;
    else {
        uint64_t u = 0;
        uint64_t d = 0;
        foreach( const Torrent * t, torrents ) {
            u += t->uploadedEver( );
            d += t->downloadedEver( );
        }
        string = tr( "%1 (Ratio: %2)" )
                   .arg( Formatter::sizeToString( u ) )
                   .arg( Formatter::ratioToString( tr_getRatio( u, d ) ) );
    }
    myUploadedLabel->setText( string );

    const QDateTime qdt_now = QDateTime::currentDateTime( );

    // myRunTimeLabel
    if( torrents.empty( ) )
        string = none;
    else {
        bool allPaused = true;
        QDateTime baseline = torrents[0]->lastStarted( );
        foreach( const Torrent * t, torrents ) {
            if( baseline != t->lastStarted( ) )
                baseline = QDateTime( );
            if( !t->isPaused( ) )
                allPaused = false;
        }
        if( allPaused )
            string = stateString; // paused || finished
        else if( baseline.isNull( ) )
            string = mixed;
        else
            string = Formatter::timeToString( baseline.secsTo( qdt_now ) );
    }
    myRunTimeLabel->setText( string );


    // myETALabel
    string.clear( );
    if( torrents.empty( ) )
        string = none;
    else {
        int baseline = torrents[0]->getETA( );
        foreach( const Torrent * t, torrents ) {
            if( baseline != t->getETA( ) ) {
                string = mixed;
                break;
            }
        }
        if( string.isEmpty( ) ) {
            if( baseline < 0 )
                string = tr( "Unknown" );
            else
                string = Formatter::timeToString( baseline );
       }
    }
    myETALabel->setText( string );


    // myLastActivityLabel
    if( torrents.empty( ) )
        string = none;
    else {
        QDateTime latest = torrents[0]->lastActivity( );
        foreach( const Torrent * t, torrents ) {
            const QDateTime dt = t->lastActivity( );
            if( latest < dt )
                latest = dt;
        }
        const int seconds = latest.isValid() ? latest.secsTo( qdt_now ) : -1;
        if( seconds < 0 )
            string = none;
        else if( seconds < 5 )
            string = tr( "Active now" );
        else
            string = tr( "%1 ago" ).arg( Formatter::timeToString( seconds ) );
    }
    myLastActivityLabel->setText( string );


    if( torrents.empty( ) )
        string = none;
    else {
        string = torrents[0]->getError( );
        foreach( const Torrent * t, torrents ) {
            if( string != t->getError( ) ) {
                string = mixed;
                break;
            }
        }
    }
    if( string.isEmpty( ) )
        string = none;
    myErrorLabel->setText( string );


    ///
    /// information tab
    ///

    // mySizeLabel
    if( torrents.empty( ) )
        string = none;
    else {
        int pieces = 0;
        uint64_t size = 0;
        uint32_t pieceSize = torrents[0]->pieceSize( );
        foreach( const Torrent * t, torrents ) {
            pieces += t->pieceCount( );
            size += t->totalSize( );
            if( pieceSize != t->pieceSize( ) )
                pieceSize = 0;
        }
        if( !size )
            string = none;
        else if( pieceSize > 0 )
            string = tr( "%1 (%Ln pieces @ %2)", "", pieces )
                     .arg( Formatter::sizeToString( size ) )
                     .arg( Formatter::memToString( pieceSize ) );
        else
            string = tr( "%1 (%Ln pieces)", "", pieces )
                     .arg( Formatter::sizeToString( size ) );
    }
    mySizeLabel->setText( string );

    // myHashLabel
    if( torrents.empty( ) )
        string = none;
    else {
        string = torrents[0]->hashString( );
        foreach( const Torrent * t, torrents ) {
            if( string != t->hashString( ) ) {
                string = mixed;
                break;
            }
        }
    }
    myHashLabel->setText( string );

    // myPrivacyLabel
    if( torrents.empty( ) )
        string = none;
    else {
        bool b = torrents[0]->isPrivate( );
        string = b ? tr( "Private to this tracker -- DHT and PEX disabled" )
                   : tr( "Public torrent" );
        foreach( const Torrent * t, torrents ) {
            if( b != t->isPrivate( ) ) {
                string = mixed;
                break;
            }
        }
    }
    myPrivacyLabel->setText( string );

    // myCommentBrowser
    if( torrents.empty( ) )
        string = none;
    else {
        string = torrents[0]->comment( );
        foreach( const Torrent * t, torrents ) {
            if( string != t->comment( ) ) {
                string = mixed;
                break;
            }
        }
    }
    myCommentBrowser->setText( string );
    myCommentBrowser->setMaximumHeight( QWIDGETSIZE_MAX );

    // myOriginLabel
    if( torrents.empty( ) )
        string = none;
    else {
        bool mixed_creator=false, mixed_date=false;
        const QString creator = torrents[0]->creator();
        const QString date = torrents[0]->dateCreated().toString();
        foreach( const Torrent * t, torrents ) {
            mixed_creator |= ( creator != t->creator() );
            mixed_date |=  ( date != t->dateCreated().toString() );
        }
        if( mixed_creator && mixed_date )
            string = mixed;
        else if( mixed_date && !creator.isEmpty())
            string = tr( "Created by %1" ).arg( creator );
        else if( mixed_creator && !date.isEmpty())
            string = tr( "Created on %1" ).arg( date );
        else if( creator.isEmpty() && date.isEmpty())
            string = tr( "N/A" );
        else
            string = tr( "Created by %1 on %2" ).arg( creator ).arg( date );
    }
    myOriginLabel->setText( string );

    // myLocationLabel
    if( torrents.empty( ) )
        string = none;
    else {
        string = torrents[0]->getPath( );
        foreach( const Torrent * t, torrents ) {
            if( string != t->getPath( ) ) {
                string = mixed;
                break;
            }
        }
    }
    myLocationLabel->setText( string );


    ///
    ///  Options Tab
    ///

    if( myChangedTorrents && !torrents.empty( ) )
    {
        int i;
        const Torrent * baseline = *torrents.begin();
        const Torrent * tor;
        bool uniform;
        bool baselineFlag;
        int baselineInt;

        // mySessionLimitCheck
        uniform = true;
        baselineFlag = baseline->honorsSessionLimits( );
        foreach( tor, torrents ) if( baselineFlag != tor->honorsSessionLimits( ) ) { uniform = false; break; }
        mySessionLimitCheck->setChecked( uniform && baselineFlag );

        // mySingleDownCheck
        uniform = true;
        baselineFlag = baseline->downloadIsLimited( );
        foreach( tor, torrents ) if( baselineFlag != tor->downloadIsLimited( ) ) { uniform = false; break; }
        mySingleDownCheck->setChecked( uniform && baselineFlag );

        // mySingleUpCheck
        uniform = true;
        baselineFlag = baseline->uploadIsLimited( );
        foreach( tor, torrents ) if( baselineFlag != tor->uploadIsLimited( ) ) { uniform = false; break; }
        mySingleUpCheck->setChecked( uniform && baselineFlag );

        // myBandwidthPriorityCombo
        uniform = true;
        baselineInt = baseline->getBandwidthPriority( );
        foreach( tor, torrents ) if ( baselineInt != tor->getBandwidthPriority( ) ) { uniform = false; break; }
        if( uniform )
            i = myBandwidthPriorityCombo->findData( baselineInt );
        else
            i = -1;
        setIfIdle( myBandwidthPriorityCombo, i );

        setIfIdle( mySingleDownSpin, int(tor->downloadLimit().KBps()) );
        setIfIdle( mySingleUpSpin, int(tor->uploadLimit().KBps()) );
        setIfIdle( myPeerLimitSpin, tor->peerLimit() );
    }

    if( !torrents.empty( ) )
    {
        const Torrent * tor;

        // ratio
        bool uniform = true;
        int baselineInt = torrents[0]->seedRatioMode( );
        foreach( tor, torrents ) if( baselineInt != tor->seedRatioMode( ) ) { uniform = false; break; }

        setIfIdle( myRatioCombo, uniform ? myRatioCombo->findData( baselineInt ) : -1 );
        myRatioSpin->setVisible( uniform && ( baselineInt == TR_RATIOLIMIT_SINGLE ) );

        setIfIdle( myRatioSpin, tor->seedRatioLimit( ) );

        // idle
        uniform = true;
        baselineInt = torrents[0]->seedIdleMode( );
        foreach( tor, torrents ) if( baselineInt != tor->seedIdleMode( ) ) { uniform = false; break; }

        setIfIdle( myIdleCombo, uniform ? myIdleCombo->findData( baselineInt ) : -1 );
        myIdleSpin->setVisible( uniform && ( baselineInt == TR_RATIOLIMIT_SINGLE ) );

        setIfIdle( myIdleSpin, tor->seedIdleLimit( ) );
    }

    ///
    ///  Tracker tab
    ///

    myTrackerModel->refresh( myModel, myIds );

    ///
    ///  Peers tab
    ///

    QMap<QString,QTreeWidgetItem*> peers2;
    QList<QTreeWidgetItem*> newItems;
    foreach( const Torrent * t, torrents )
    {
        const QString idStr( QString::number( t->id( ) ) );
        PeerList peers = t->peers( );

        foreach( const Peer& peer, peers )
        {
            const QString key = idStr + ":" + peer.address;
            PeerItem * item = (PeerItem*) myPeers.value( key, 0 );

            if( item == 0 ) // new peer has connected
            {
                static const QIcon myEncryptionIcon( ":/icons/encrypted.png" );
                static const QIcon myEmptyIcon;
                item = new PeerItem( peer );
                item->setTextAlignment( COL_UP, Qt::AlignRight|Qt::AlignVCenter );
                item->setTextAlignment( COL_DOWN, Qt::AlignRight|Qt::AlignVCenter );
                item->setTextAlignment( COL_PERCENT, Qt::AlignRight|Qt::AlignVCenter );
                item->setIcon( COL_LOCK, peer.isEncrypted ? myEncryptionIcon : myEmptyIcon );
                item->setToolTip( COL_LOCK, peer.isEncrypted ? tr( "Encrypted connection" ) : "" );
                item->setText( COL_ADDRESS, peer.address );
                item->setText( COL_CLIENT, peer.clientName );
                newItems << item;
            }

            const QString code = peer.flagStr;
            item->setStatus( code );
            item->refresh( peer );

            QString codeTip;
            foreach( QChar ch, code ) {
                QString txt;
                switch( ch.toAscii() ) {
                    case 'O': txt = tr( "Optimistic unchoke" ); break;
                    case 'D': txt = tr( "Downloading from this peer" ); break;
                    case 'd': txt = tr( "We would download from this peer if they would let us" ); break;
                    case 'U': txt = tr( "Uploading to peer" ); break;
                    case 'u': txt = tr( "We would upload to this peer if they asked" ); break;
                    case 'K': txt = tr( "Peer has unchoked us, but we're not interested" ); break;
                    case '?': txt = tr( "We unchoked this peer, but they're not interested" ); break;
                    case 'E': txt = tr( "Encrypted connection" ); break;
                    case 'H': txt = tr( "Peer was discovered through DHT" ); break;
                    case 'X': txt = tr( "Peer was discovered through Peer Exchange (PEX)" ); break;
                    case 'I': txt = tr( "Peer is an incoming connection" ); break;
                    case 'T': txt = tr( "Peer is connected over uTP" ); break;
                }
                if( !txt.isEmpty( ) )
                    codeTip += QString("%1: %2\n").arg(ch).arg(txt);
            }

            if( !codeTip.isEmpty() )
                codeTip.resize( codeTip.size()-1 ); // eat the trailing linefeed

            item->setText( COL_UP, peer.rateToPeer.isZero() ? "" : Formatter::speedToString( peer.rateToPeer ) );
            item->setText( COL_DOWN, peer.rateToClient.isZero() ? "" : Formatter::speedToString( peer.rateToClient ) );
            item->setText( COL_PERCENT, peer.progress > 0 ? QString( "%1%" ).arg( (int)( peer.progress * 100.0 ) ) : "" );
            item->setText( COL_STATUS, code );
            item->setToolTip( COL_STATUS, codeTip );

            peers2.insert( key, item );
        }
    }
    myPeerTree->addTopLevelItems( newItems );
    foreach( QString key, myPeers.keys() ) {
        if( !peers2.contains( key ) ) { // old peer has disconnected
            QTreeWidgetItem * item = myPeers.value( key, 0 );
            myPeerTree->takeTopLevelItem( myPeerTree->indexOfTopLevelItem( item ) );
            delete item;
        }
    }
    myPeers = peers2;

    if( !single || myFilesDirty )
        myFileTreeView->clear( );
    if( single )
        myFileTreeView->update( torrents[0]->files( ) , myChangedTorrents );
    myFilesDirty = false;

    myChangedTorrents = false;
    myHavePendingRefresh = false;
    foreach( QWidget * w, myWidgets )
        w->setEnabled( true );
}

void
Details :: enableWhenChecked( QCheckBox * box, QWidget * w )
{
    connect( box, SIGNAL(toggled(bool)), w, SLOT(setEnabled(bool)) );
    w->setEnabled( box->isChecked( ) );
}


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

QWidget *
Details :: createInfoTab( )
{
    HIG * hig = new HIG( this );

    hig->addSectionTitle( tr( "Activity" ) );
    hig->addRow( tr( "Have:" ), myHaveLabel = new SqueezeLabel );
    hig->addRow( tr( "Availability:" ), myAvailabilityLabel = new SqueezeLabel );
    hig->addRow( tr( "Downloaded:" ), myDownloadedLabel = new SqueezeLabel );
    hig->addRow( tr( "Uploaded:" ), myUploadedLabel = new SqueezeLabel );
    hig->addRow( tr( "State:" ), myStateLabel = new SqueezeLabel );
    hig->addRow( tr( "Running time:" ), myRunTimeLabel = new SqueezeLabel );
    hig->addRow( tr( "Remaining time:" ), myETALabel = new SqueezeLabel );
    hig->addRow( tr( "Last activity:" ), myLastActivityLabel = new SqueezeLabel );
    hig->addRow( tr( "Error:" ), myErrorLabel = new SqueezeLabel );
    hig->addSectionDivider( );

    hig->addSectionDivider( );
    hig->addSectionTitle( tr( "Details" ) );
    hig->addRow( tr( "Size:" ), mySizeLabel = new SqueezeLabel );
    hig->addRow( tr( "Location:" ), myLocationLabel = new SqueezeLabel );
    hig->addRow( tr( "Hash:" ), myHashLabel = new SqueezeLabel );
    hig->addRow( tr( "Privacy:" ), myPrivacyLabel = new SqueezeLabel );
    hig->addRow( tr( "Origin:" ), myOriginLabel = new SqueezeLabel );
    myOriginLabel->setMinimumWidth( 325 ); // stop long origin strings from resizing the widgit
    hig->addRow( tr( "Comment:" ), myCommentBrowser = new QTextBrowser );
    const int h = QFontMetrics(myCommentBrowser->font()).lineSpacing() * 4;
    myCommentBrowser->setFixedHeight( h );

    hig->finish( );

    return hig;
}

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

void
Details :: onShowTrackerScrapesToggled (bool val)
{
    myPrefs.set (Prefs::SHOW_TRACKER_SCRAPES, val);
}

void
Details :: onShowBackupTrackersToggled (bool val)
{
  myPrefs.set (Prefs::SHOW_BACKUP_TRACKERS, val);
}

void
Details :: onHonorsSessionLimitsToggled (bool val)
{
  mySession.torrentSet (myIds, TR_KEY_honorsSessionLimits, val);
  getNewData ();
}
void
Details :: onDownloadLimitedToggled (bool val)
{
  mySession.torrentSet (myIds, TR_KEY_downloadLimited, val);
  getNewData ();
}
void
Details :: onSpinBoxEditingFinished ()
{
  const QObject * spin = sender();
  const tr_quark key = spin->property(PREF_KEY).toInt();
  const QDoubleSpinBox * d = qobject_cast<const QDoubleSpinBox*>( spin );
  if (d)
    mySession.torrentSet( myIds, key, d->value( ) );
  else
    mySession.torrentSet( myIds, key, qobject_cast<const QSpinBox*>(spin)->value( ) );
  getNewData( );
}

void
Details :: onUploadLimitedToggled (bool val)
{
  mySession.torrentSet (myIds, TR_KEY_uploadLimited, val);
  getNewData ();
}

void
Details :: onIdleModeChanged (int index)
{
  const int val = myIdleCombo->itemData(index).toInt();
  mySession.torrentSet (myIds, TR_KEY_seedIdleMode, val);
  getNewData ();
}

void
Details :: onRatioModeChanged (int index)
{
  const int val = myRatioCombo->itemData(index).toInt();
  mySession.torrentSet (myIds, TR_KEY_seedRatioMode, val);
}

void
Details :: onBandwidthPriorityChanged (int index)
{
  if( index != -1 )
    {
      const int priority = myBandwidthPriorityCombo->itemData(index).toInt();
      mySession.torrentSet( myIds, TR_KEY_bandwidthPriority, priority );
      getNewData( );
    }
}

void
Details :: onTrackerSelectionChanged ()
{
  const int selectionCount = myTrackerView->selectionModel()->selectedRows().size();
  myEditTrackerButton->setEnabled (selectionCount == 1);
  myRemoveTrackerButton->setEnabled (selectionCount > 0);
}

void
Details :: onAddTrackerClicked ()
{
  bool ok = false;
  const QString url = QInputDialog::getText (this,
                                             tr("Add URL "),
                                             tr("Add tracker announce URL:"),
                                             QLineEdit::Normal, QString(), &ok);
  if(!ok)
    {
      // user pressed "cancel" -- noop
    }
  else if (!QUrl(url).isValid())
    {
      QMessageBox::warning( this, tr("Error"), tr("Invalid URL \"%1\"").arg(url));
    }
  else
    {
      QSet<int> ids;

      foreach (int id, myIds)
        if (myTrackerModel->find(id,url) == -1)
          ids.insert (id);

      if (ids.empty()) // all the torrents already have this tracker
        {
          QMessageBox::warning (this, tr("Error"), tr("Tracker already exists."));
        }
        else
        {
          QStringList urls;
          urls << url;
          mySession.torrentSet (ids, TR_KEY_trackerAdd, urls);
          getNewData ();
        }
    }
}

void
Details :: onEditTrackerClicked ()
{
  QItemSelectionModel * selectionModel = myTrackerView->selectionModel();
  QModelIndexList selectedRows = selectionModel->selectedRows();
  assert (selectedRows.size() == 1);
  QModelIndex i = selectionModel->currentIndex();
  const TrackerInfo trackerInfo = myTrackerView->model()->data(i, TrackerModel::TrackerRole).value<TrackerInfo>();

  bool ok = false;
  const QString newval = QInputDialog::getText (this,
                                                tr("Edit URL "),
                                                tr("Edit tracker announce URL:"),
                                                QLineEdit::Normal,
                                                trackerInfo.st.announce, &ok);

  if (!ok)
    {
      // user pressed "cancel" -- noop
    }
  else if( !QUrl(newval).isValid( ) )
    {
      QMessageBox::warning (this, tr("Error"), tr("Invalid URL \"%1\"").arg(newval));
    }
    else
    {
      QSet<int> ids;
      ids << trackerInfo.torrentId;

      const QPair<int,QString> idUrl = qMakePair (trackerInfo.st.id, newval);

      mySession.torrentSet (ids, TR_KEY_trackerReplace, idUrl);
      getNewData ();
    }
}

void
Details :: onRemoveTrackerClicked( )
{
    // make a map of torrentIds to announce URLs to remove
    QItemSelectionModel * selectionModel = myTrackerView->selectionModel( );
    QModelIndexList selectedRows = selectionModel->selectedRows( );
    QMap<int,int> torrentId_to_trackerIds;
    foreach( QModelIndex i, selectedRows )
    {
        const TrackerInfo inf = myTrackerView->model()->data( i, TrackerModel::TrackerRole ).value<TrackerInfo>();
        torrentId_to_trackerIds.insertMulti( inf.torrentId, inf.st.id );
    }

    // batch all of a tracker's torrents into one command
    foreach( int id, torrentId_to_trackerIds.uniqueKeys( ) )
    {
        QSet<int> ids;
        ids << id;
        mySession.torrentSet( ids, TR_KEY_trackerRemove, torrentId_to_trackerIds.values( id ) );
    }

    selectionModel->clearSelection( );
    getNewData( );
}

QWidget *
Details :: createOptionsTab( )
{
    QSpinBox * s;
    QCheckBox * c;
    QComboBox * m;
    QHBoxLayout * h;
    QDoubleSpinBox * ds;
    const QString speed_K_str = Formatter::unitStr( Formatter::SPEED, Formatter::KB );

    HIG * hig = new HIG( this );
    hig->addSectionTitle( tr( "Speed" ) );

    c = new QCheckBox( tr( "Honor global &limits" ) );
    mySessionLimitCheck = c;
    hig->addWideControl( c );
    connect( c, SIGNAL(clicked(bool)), this, SLOT(onHonorsSessionLimitsToggled(bool)) );

    c = new QCheckBox( tr( "Limit &download speed (%1):" ).arg( speed_K_str ) );
    mySingleDownCheck = c;
    s = new QSpinBox( );
    s->setProperty (PREF_KEY, TR_KEY_downloadLimit);
    s->setSingleStep( 5 );
    s->setRange( 0, INT_MAX );
    mySingleDownSpin = s;
    hig->addRow( c, s );
    enableWhenChecked( c, s );
    connect( c, SIGNAL(clicked(bool)), this, SLOT(onDownloadLimitedToggled(bool)) );
    connect( s, SIGNAL(editingFinished()), this, SLOT(onSpinBoxEditingFinished()));

    c = new QCheckBox( tr( "Limit &upload speed (%1):" ).arg( speed_K_str ) );
    mySingleUpCheck = c;
    s = new QSpinBox( );
    s->setSingleStep( 5 );
    s->setRange( 0, INT_MAX );
    s->setProperty( PREF_KEY, TR_KEY_uploadLimit );
    mySingleUpSpin = s;
    hig->addRow( c, s );
    enableWhenChecked( c, s );
    connect( c, SIGNAL(clicked(bool)), this, SLOT(onUploadLimitedToggled(bool)) );
    connect( s, SIGNAL(editingFinished()), this, SLOT(onSpinBoxEditingFinished()));

    m = new QComboBox;
    m->addItem( tr( "High" ),   TR_PRI_HIGH );
    m->addItem( tr( "Normal" ), TR_PRI_NORMAL );
    m->addItem( tr( "Low" ),    TR_PRI_LOW );
    connect( m, SIGNAL(currentIndexChanged(int)), this, SLOT(onBandwidthPriorityChanged(int)));
    hig->addRow( tr( "Torrent &priority:" ), m );
    myBandwidthPriorityCombo = m;

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

    h = new QHBoxLayout( );
    h->setSpacing( HIG :: PAD );
    m = new QComboBox;
    m->addItem( tr( "Use Global Settings" ),      TR_RATIOLIMIT_GLOBAL );
    m->addItem( tr( "Seed regardless of ratio" ), TR_RATIOLIMIT_UNLIMITED );
    m->addItem( tr( "Stop seeding at ratio:" ),   TR_RATIOLIMIT_SINGLE );
    connect( m, SIGNAL(currentIndexChanged(int)), this, SLOT(onRatioModeChanged(int)));
    h->addWidget( myRatioCombo = m );
    ds = new QDoubleSpinBox( );
    ds->setRange( 0.5, INT_MAX );
    ds->setProperty( PREF_KEY, TR_KEY_seedRatioLimit );
    connect( ds, SIGNAL(editingFinished()), this, SLOT(onSpinBoxEditingFinished()));
    h->addWidget( myRatioSpin = ds );
    hig->addRow( tr( "&Ratio:" ), h, m );

    h = new QHBoxLayout( );
    h->setSpacing( HIG :: PAD );
    m = new QComboBox;
    m->addItem( tr( "Use Global Settings" ),                 TR_IDLELIMIT_GLOBAL );
    m->addItem( tr( "Seed regardless of activity" ),         TR_IDLELIMIT_UNLIMITED );
    m->addItem( tr( "Stop seeding if idle for N minutes:" ), TR_IDLELIMIT_SINGLE );
    connect( m, SIGNAL(currentIndexChanged(int)), this, SLOT(onIdleModeChanged(int)));
    h->addWidget( myIdleCombo = m );
    s = new QSpinBox( );
    s->setSingleStep( 5 );
    s->setRange( 1, 9999 );
    s->setProperty( PREF_KEY, TR_KEY_seedIdleLimit );
    connect( s, SIGNAL(editingFinished()), this, SLOT(onSpinBoxEditingFinished()));
    h->addWidget( myIdleSpin = s );
    hig->addRow( tr( "&Idle:" ), h, m );


    hig->addSectionDivider( );
    hig->addSectionTitle( tr( "Peer Connections" ) );

    s = new QSpinBox( );
    s->setSingleStep( 5 );
    s->setRange( 1, 300 );
    s->setProperty( PREF_KEY, TR_KEY_peer_limit );
    connect( s, SIGNAL(editingFinished()), this, SLOT(onSpinBoxEditingFinished()));
    myPeerLimitSpin = s;
    hig->addRow( tr( "&Maximum peers:" ), s );

    hig->finish( );

    return hig;
}

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

QWidget *
Details :: createTrackerTab( )
{
    QCheckBox * c;
    QPushButton * p;
    QWidget * top = new QWidget;
    QVBoxLayout * v = new QVBoxLayout( top );
    QHBoxLayout * h = new QHBoxLayout();
    QVBoxLayout * v2 = new QVBoxLayout();

    v->setSpacing( HIG::PAD_BIG );
    v->setContentsMargins( HIG::PAD_BIG, HIG::PAD_BIG, HIG::PAD_BIG, HIG::PAD_BIG );

    h->setSpacing( HIG::PAD );
    h->setContentsMargins( HIG::PAD_SMALL, HIG::PAD_SMALL, HIG::PAD_SMALL, HIG::PAD_SMALL );

    v2->setSpacing( HIG::PAD );

    myTrackerModel = new TrackerModel;
    myTrackerFilter = new TrackerModelFilter;
    myTrackerFilter->setSourceModel( myTrackerModel );
    myTrackerView = new QTreeView;
    myTrackerView->setModel( myTrackerFilter );
    myTrackerView->setHeaderHidden( true );
    myTrackerView->setSelectionMode( QTreeWidget::ExtendedSelection );
    myTrackerView->setRootIsDecorated( false );
    myTrackerView->setIndentation( 2 );
    myTrackerView->setItemsExpandable( false );
    myTrackerView->setAlternatingRowColors( true );
    myTrackerView->setItemDelegate( myTrackerDelegate = new TrackerDelegate( ) );
    connect( myTrackerView->selectionModel(), SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)), this, SLOT(onTrackerSelectionChanged()));
    h->addWidget( myTrackerView, 1 );

    p = new QPushButton();
    p->setIcon( getStockIcon( "list-add", QStyle::SP_DialogOpenButton ) );
    p->setToolTip( tr( "Add Tracker" ));
    myAddTrackerButton = p;
    v2->addWidget( p, 1 );
    connect( p, SIGNAL(clicked(bool)), this, SLOT(onAddTrackerClicked()));

    p = new QPushButton();
    p->setIcon( getStockIcon( "document-properties", QStyle::SP_DesktopIcon ) );
    p->setToolTip( tr( "Edit Tracker" ));
    myAddTrackerButton = p;
    p->setEnabled( false );
    myEditTrackerButton = p;
    v2->addWidget( p, 1 );
    connect( p, SIGNAL(clicked(bool)), this, SLOT(onEditTrackerClicked()));

    p = new QPushButton();
    p->setIcon( getStockIcon( "list-remove", QStyle::SP_TrashIcon ) );
    p->setToolTip( tr( "Remove Trackers" ));
    p->setEnabled( false );
    myRemoveTrackerButton = p;
    v2->addWidget( p, 1 );
    connect( p, SIGNAL(clicked(bool)), this, SLOT(onRemoveTrackerClicked()));

    v2->addStretch( 1 );

    h->addLayout( v2, 1 );
    h->setStretch( 1, 0 );

    v->addLayout( h, 1 );

    c = new QCheckBox( tr( "Show &more details" ) );
    c->setChecked( myPrefs.getBool( Prefs::SHOW_TRACKER_SCRAPES ) );
    myShowTrackerScrapesCheck = c;
    v->addWidget( c, 1 );
    connect( c, SIGNAL(clicked(bool)), this, SLOT(onShowTrackerScrapesToggled(bool)) );

    c = new QCheckBox( tr( "Show &backup trackers" ) );
    c->setChecked( myPrefs.getBool( Prefs::SHOW_BACKUP_TRACKERS ) );
    myShowBackupTrackersCheck = c;
    v->addWidget( c, 1 );
    connect( c, SIGNAL(clicked(bool)), this, SLOT(onShowBackupTrackersToggled(bool)) );

    return top;
}

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

QWidget *
Details :: createPeersTab( )
{
    QWidget * top = new QWidget;
    QVBoxLayout * v = new QVBoxLayout( top );
    v->setSpacing( HIG :: PAD_BIG );
    v->setContentsMargins( HIG::PAD_BIG, HIG::PAD_BIG, HIG::PAD_BIG, HIG::PAD_BIG );

    QStringList headers;
    headers << QString() << tr("Up") << tr("Down") << tr("%") << tr("Status") << tr("Address") << tr("Client");
    myPeerTree = new QTreeWidget;
    myPeerTree->setUniformRowHeights( true );
    myPeerTree->setHeaderLabels( headers );
    myPeerTree->setColumnWidth( 0, 20 );
    myPeerTree->setSortingEnabled( true );
    myPeerTree->sortByColumn( COL_ADDRESS, Qt::AscendingOrder );
    myPeerTree->setRootIsDecorated( false );
    myPeerTree->setTextElideMode( Qt::ElideRight );
    v->addWidget( myPeerTree, 1 );

    const QFontMetrics m( font( ) );
    QSize size = m.size( 0, "1024 MiB/s" );
    myPeerTree->setColumnWidth( COL_UP, size.width( ) );
    myPeerTree->setColumnWidth( COL_DOWN, size.width( ) );
    size = m.size( 0, " 100% " );
    myPeerTree->setColumnWidth( COL_PERCENT, size.width( ) );
    size = m.size( 0, "ODUK?EXI" );
    myPeerTree->setColumnWidth( COL_STATUS, size.width( ) );
    size = m.size( 0, "888.888.888.888" );
    myPeerTree->setColumnWidth( COL_ADDRESS, size.width( ) );
    size = m.size( 0, "Some BitTorrent Client" );
    myPeerTree->setColumnWidth( COL_CLIENT, size.width( ) );
    myPeerTree->setAlternatingRowColors( true );

    return top;
}

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

QWidget *
Details :: createFilesTab( )
{
    myFileTreeView = new FileTreeView( );

    connect( myFileTreeView, SIGNAL(      priorityChanged(const QSet<int>&, int)),
             this,           SLOT(  onFilePriorityChanged(const QSet<int>&, int)));

    connect( myFileTreeView, SIGNAL(      wantedChanged(const QSet<int>&, bool)),
             this,           SLOT(  onFileWantedChanged(const QSet<int>&, bool)));

    connect( myFileTreeView, SIGNAL( pathEdited(const QString&, const QString&)),
             this,           SLOT (onPathEdited(const QString&, const QString&)));

    return myFileTreeView;
}

void
Details :: onFilePriorityChanged (const QSet<int>& indices, int priority)
{
  tr_quark key;

  switch (priority)
    {
      case TR_PRI_LOW:
        key = TR_KEY_priority_low;
        break;

      case TR_PRI_HIGH:
        key = TR_KEY_priority_high;
        break;

      default:
        key = TR_KEY_priority_normal;
        break;
    }

  mySession.torrentSet (myIds, key, indices.toList());
    getNewData( );
}

void
Details :: onFileWantedChanged (const QSet<int>& indices, bool wanted)
{
  const tr_quark key = wanted ? TR_KEY_files_wanted : TR_KEY_files_unwanted;
  mySession.torrentSet (myIds, key, indices.toList());
  getNewData ();
}

void
Details :: onPathEdited (const QString& oldpath, const QString& newname)
{
  mySession.torrentRenamePath (myIds, oldpath, newname);
}