/***************************************************************************
                          sq_slideshowwidget.cpp  -  description
                             -------------------
    begin                : ??? Mar 30 2007
    copyright            : (C) 2007 by Baryshev Dmitry
    email                : ksquirrel.iv@gmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <qimage.h>
#include <qpainter.h>
#include <qtimer.h>
#include <qtoolbutton.h>
#include <qhbox.h>
#include <qfileinfo.h>
#include <qfont.h>
#include <qlabel.h>
#include <qwhatsthis.h>

#include <kcursor.h>
#include <klocale.h>
#include <kio/global.h>
#include <kglobalsettings.h>

#include <ksquirrel-libs/fmt_defs.h>

#include "ksquirrel.h"
#include "sq_slideshowwidget.h"
#include "sq_imageloader.h"
#include "sq_iconloader.h"
#include "sq_config.h"
#include "sq_utils.h"

#ifdef SQ_HAVE_KEXIF
#include <libkexif/kexifdata.h>
#include <algorithm>
#endif

SQ_SlideShowWidget * SQ_SlideShowWidget::m_inst = 0;

SQ_SlideShowWidget::SQ_SlideShowWidget(QWidget *parent, const char *name)
    : QWidget(parent,name, Qt::WStyle_Customize | Qt::WStyle_NoBorder | Qt::WStyle_StaysOnTop | Qt::WNoAutoErase)
{
    m_inst = this;

    timerHide = new QTimer(this);

    message = new QLabel(this);

    QFont f = message->font();
    f.setPointSize(12);
    f.setBold(true);
    message->setFont(f);
    message->setMargin(4);
    message->setFrameShape(QFrame::NoFrame);

    connect(timerHide, SIGNAL(timeout()), this, SLOT(slotHide()));

    options = new QHBox(this, "kde toolbar widget");
    options->setSpacing(0);
    options->setMargin(1);
    options->move(0, 0);
    options->hide();
    message->hide();

    int is = KIcon::SizeMedium;

    QToolButton *b = new QToolButton(options);
    b->setIconSet(SQ_IconLoader::instance()->loadIcon("previous", KIcon::Desktop, is));
    connect(b, SIGNAL(clicked()), this, SIGNAL(previous()));
    connect(b, SIGNAL(clicked()), this, SLOT(slotResetPause()));

    b = new QToolButton(options);
    b->setIconSet(SQ_IconLoader::instance()->loadIcon("next", KIcon::Desktop, is));
    connect(b, SIGNAL(clicked()), this, SIGNAL(next()));
    connect(b, SIGNAL(clicked()), this, SLOT(slotResetPause()));

    buttonPause = new QToolButton(options);
    buttonPause->setToggleButton(true);
    buttonPause->setIconSet(SQ_IconLoader::instance()->loadIcon("player_pause", KIcon::Desktop, is));
    connect(buttonPause, SIGNAL(clicked()), this, SIGNAL(pause()));

    b = new QToolButton(options);
    b->setIconSet(SQ_IconLoader::instance()->loadIcon("help", KIcon::Desktop, is));
    connect(b, SIGNAL(clicked()), this, SLOT(slotShowHelp()));

    b = new QToolButton(options);
    b->setIconSet(SQ_IconLoader::instance()->loadIcon("cancel", KIcon::Desktop, is));
    connect(b, SIGNAL(clicked()), this, SIGNAL(stopSlideShow()));

    options->adjustSize();
    message->setFixedHeight(options->height());

    options->installEventFilter(this);

    KCursor::setAutoHideCursor(this, true);
    KCursor::setHideCursorDelay(2500);
}

SQ_SlideShowWidget::~SQ_SlideShowWidget()
{}

void SQ_SlideShowWidget::beginSlideShow(int totl)
{
    total = totl;

    SQ_Config::instance()->setGroup("Slideshow");

    bgcolor.setNamedColor(SQ_Config::instance()->readEntry("background", "#4e4e4e"));

    messages = SQ_Config::instance()->readBoolEntry("messages", true);
    mes_pos = SQ_Config::instance()->readBoolEntry("messages_pos", true);
    mes_name = SQ_Config::instance()->readBoolEntry("messages_name", true);
    mes_size = SQ_Config::instance()->readBoolEntry("messages_size", false);
    tcolor.setNamedColor(SQ_Config::instance()->readEntry("message_text", "#ffffff"));

    // fake transparency
    message->setPaletteForegroundColor(tcolor);
    message->setPaletteBackgroundColor(bgcolor);

    show();
    setGeometry(KGlobalSettings::desktopGeometry(KSquirrel::app()));

    message->hide();
    options->hide();

    if(messages)
    {
        message->move(0, 0);
        message->show();
    }

    path = "";
    current = 0;
    buttonPause->setOn(false);

    setFocus();
}

void SQ_SlideShowWidget::endSlideShow()
{
    options->hide();
    message->hide();
    hide();

    pixmap = QPixmap();
}

void SQ_SlideShowWidget::loadImage(const QString &_path, int _current)
{
    fmt_info *finfo;
    RGBA *bits;

    // load first page
    bool b = SQ_ImageLoader::instance()->loadImage(_path, SQ_CodecSettings::ImageViewer);

    finfo = SQ_ImageLoader::instance()->info();
    bits = SQ_ImageLoader::instance()->bits();

    // memory allocation failed in SQ_ImageLoader::loadImage()
    if(!b || !bits || !finfo->image.size())
        return;

    path = _path;
    current = _current;

    constructMessage();

    pixmap = QPixmap();

    int w = finfo->image[0].w;
    int h = finfo->image[0].h;
    QImage *all = 0, *small = 0;

    all = new QImage((uchar *)bits, w, h, 32, 0, 0, QImage::LittleEndian);
    all->setAlphaBuffer(true);

    // scale down to fit into window
    if(w > width() || h > height())
    {
        small = new QImage();
        *small = SQ_Utils::scale(*all, width(), height(), SQ_Utils::SMOOTH_FAST, QImage::ScaleMin);

        delete all;
        all = 0;

        if(small->isNull())
        {
            SQ_ImageLoader::instance()->cleanup();
            return;
        }
    }
    else
        small = all;

    const int wh =  small->width() * small->height();
    unsigned char t;
    RGBA *sk = reinterpret_cast<RGBA *>(small->bits());

    // swap R and B components - QPixmap need it
    for(int i = 0;i < wh;i++)
    {
        t = (sk+i)->r;
        (sk+i)->r = (sk+i)->b;
        (sk+i)->b = t;
    }

#ifdef SQ_HAVE_KEXIF
    KExifData data;
    data.readFromFile(_path);
    int O = data.getImageOrientation();

    if(O != KExifData::UNSPECIFIED && O != KExifData::NORMAL)
    {
        // copy original image
        QImage img = *small;

        // rotate image
        SQ_Utils::exifRotate(QString::null, img, O);

        // transfer back
        *small = img;
    }
#endif

    pixmap.convertFromImage(*small);

    // finally clean all memory buffers
    SQ_ImageLoader::instance()->cleanup();

    delete small;

    // show loaded image
    update();
}

void SQ_SlideShowWidget::paintEvent(QPaintEvent *e)
{
    QPainter p(this);

    p.setClipRect(e->rect());
    p.fillRect(e->rect(), bgcolor);

    if(!pixmap.isNull())
        p.drawPixmap((width() - pixmap.width()) / 2, (height() - pixmap.height()) / 2, pixmap);
}

void SQ_SlideShowWidget::closeEvent(QCloseEvent *e)
{
    emit stopSlideShow();

    e->ignore();
}

void SQ_SlideShowWidget::keyPressEvent(QKeyEvent *e)
{
    if(e->key() == Qt::Key_Enter || e->key() == Qt::Key_Escape || e->key() == Qt::Key_Return)
        close();
    else if(e->key() == Qt::Key_Pause || e->key() == Qt::Key_Space)
    {
        buttonPause->toggle();
        emit pause();
    }
    else if(e->key() == Qt::Key_PageUp)
        emit previous();
    else if(e->key() == Qt::Key_PageDown)
        emit next();
    else if(e->key() == Qt::Key_M)
    {
        SQ_Config::instance()->setGroup("Slideshow");

        messages = SQ_Config::instance()->readBoolEntry("messages", true);
        messages = !messages;
        SQ_Config::instance()->writeEntry("messages", messages);

        if(options->isVisible() && messages)
            message->move(options->width()+1, 0);

        constructMessage();

        message->setShown(messages);
    }

    e->accept();
}

void SQ_SlideShowWidget::mouseMoveEvent(QMouseEvent *)
{
    if(!options->isVisible())
    {
        options->show();
        if(messages) message->move(options->width()+1, 0);
    }

    timerHide->start(1500, true);
}

void SQ_SlideShowWidget::slotHide()
{
    options->hide();

    if(messages) message->move(0, 0);
}

bool SQ_SlideShowWidget::eventFilter(QObject *, QEvent *e)
{
    if(e->type() == QEvent::Enter)
    {
        timerHide->stop();
        return true;
    }

    return false;
}

void SQ_SlideShowWidget::slotShowHelp()
{
    QWhatsThis::display(i18n(
    "<table cellspacing=0>"
    "<tr><td><b>Enter, Escape, Return</b></td><td>stop slideshow</td></tr>"
    "<tr><td><b>Pause, Space</b></td><td>pause/unpause slideshow</td></tr>"
    "<tr><td><b>Page Up</b></td><td>previous image</td></tr>"
    "<tr><td><b>Page Down</b></td><td>next image</td></tr>"
    "<tr><td><b>M</b></td><td>show/hide onscreen messages</td></tr>"
    "</table>"
    ));
}

void SQ_SlideShowWidget::constructMessage()
{
    // construct onscreen message
    if(messages)
    {
        QFileInfo fm(path);
        QString s_message;

        if(mes_pos) s_message = QString::fromLatin1("[%1/%2] ").arg(current+1).arg(total);

        if(mes_name) s_message += fm.fileName();

        if(mes_size)
            s_message = (mes_name || mes_pos) ? (s_message + " (" + KIO::convertSize(fm.size()) + ')') : KIO::convertSize(fm.size());

        message->setText(s_message);
        message->adjustSize();
    }
}

void SQ_SlideShowWidget::slotResetPause()
{
    buttonPause->setOn(false);
}

#include "sq_slideshowwidget.moc"