/*
   Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#define DEBUG_KP_TOOL_SELECTION 0


#include <kpAbstractSelectionTool.h>
#include <kpAbstractSelectionToolPrivate.h>

#include <qapplication.h>
#include <qbitmap.h>
#include <qcursor.h>
#include <qevent.h>
#include <qmenu.h>
#include <qpainter.h>
#include <qpixmap.h>
#include <qpolygon.h>
#include <qtimer.h>

#include <kdebug.h>
#include <klocale.h>

#include <kpAbstractImageSelection.h>
#include <kpAbstractSelection.h>
#include <kpCommandHistory.h>
#include <kpDefs.h>
#include <kpDocument.h>
#include <kpMacroCommand.h>
#include <kpToolSelectionCreateCommand.h>
#include <kpToolSelectionDestroyCommand.h>
#include <kpToolSelectionEnvironment.h>
#include <kpToolSelectionMoveCommand.h>
#include <kpToolSelectionResizeScaleCommand.h>
#include <kpToolImageSelectionTransparencyCommand.h>
#include <kpToolToolBar.h>
#include <kpToolWidgetOpaqueOrTransparent.h>
#include <kpView.h>
#include <kpViewManager.h>


// private
void kpAbstractSelectionTool::initCreate ()
{
    d->createNOPTimer = new QTimer (this);
    d->createNOPTimer->setSingleShot (true);
    connect (d->createNOPTimer, SIGNAL (timeout ()),
             this, SLOT (delayedDrawCreate ()));
}

// private
void kpAbstractSelectionTool::uninitCreate ()
{
    // d->createNOPTimer (deleted by QObject mechanism)
}


// private
void kpAbstractSelectionTool::beginCreate ()
{
    // d->createNOPTimer
}

// private
void kpAbstractSelectionTool::endCreate ()
{
    // d->createNOPTimer
}

//---------------------------------------------------------------------
// use a crosshair cursor which is really always exactly 1 pixel wide
// to the contrary of the "themed" crosshair cursors which might look nice
// but does not allow to exactly position the hot-spot.
/* XPM */
static const char *crosshair[]={
"17 17 3 1",
". c None",
"x c #FFFFFF",
"# c #000000",
".......xxx.......",
".......x#x.......",
".......x#x.......",
".......x#x.......",
".......x#x.......",
".......x#x.......",
".......x#x.......",
"xxxxxxxx#xxxxxxxx",
"x#######.#######x",
"xxxxxxxx#xxxxxxxx",
".......x#x.......",
".......x#x.......",
".......x#x.......",
".......x#x.......",
".......x#x.......",
".......x#x.......",
".......xxx......."};

// private
void kpAbstractSelectionTool::setCursorCreate ()
{
    viewManager()->setCursor(QCursor(QPixmap(crosshair), 8, 8));
}

//---------------------------------------------------------------------

// protected virtual
void kpAbstractSelectionTool::setSelectionBorderForBeginDrawCreate ()
{
    viewManager ()->setQueueUpdates ();
    {
        // LOREFACTOR: I suspect some calls to viewManager() in this
        //             file (including this) are redundant since any
        //             code that tweaks such settings, returns them to
        //             their original state, after the code is complete.
        viewManager ()->setSelectionBorderVisible (true);

        viewManager ()->setSelectionBorderFinished (false);
    }
    viewManager ()->restoreQueueUpdates ();
}

// private
void kpAbstractSelectionTool::beginDrawCreate ()
{
    if (document ()->selection ())
        pushOntoDocument ();

    /*virtual*/setSelectionBorderForBeginDrawCreate ();

    // (single shot)
    d->createNOPTimer->start (200/*ms*/);

    setUserMessage (cancelUserMessage ());
}


// private
void kpAbstractSelectionTool::drawCreate (const QPoint &thisPoint,
        const QRect &normalizedRect)
{
#if DEBUG_KP_TOOL_SELECTION && 1
    kDebug () << "\tnot moving - resizing rect to" << normalizedRect
                << endl;
    kDebug () << "\t\tcreateNOPTimer->isActive()="
                << d->createNOPTimer->isActive ()
                << " viewManhattanLength from startPoint="
                << viewUnderStartPoint ()->transformDocToViewX ((thisPoint - startPoint ()).manhattanLength ())
                << endl;
#endif

    QPoint accidentalDragAdjustedPoint = thisPoint;
    if (d->createNOPTimer->isActive ())
    {
        // See below "d->createNOPTimer->stop()".
        Q_ASSERT (!d->dragAccepted);

        if (viewUnderStartPoint ()->transformDocToViewX (
                (accidentalDragAdjustedPoint - startPoint ()).manhattanLength ()) <= 6)
        {
        #if DEBUG_KP_TOOL_SELECTION && 1
            kDebug () << "\t\tsuppress accidental movement";
        #endif
            accidentalDragAdjustedPoint = startPoint ();
        }
        else
        {
        #if DEBUG_KP_TOOL_SELECTION && 1
            kDebug () << "\t\tit's a \"big\" intended move - stop timer";
        #endif
            d->createNOPTimer->stop ();
        }
    }


    const bool hadSelection = document ()->selection ();

    const bool oldDrawAcceptedAsDrag = d->dragAccepted;
    d->dragAccepted = /*virtual*/drawCreateMoreSelectionAndUpdateStatusBar (
        d->dragAccepted,
        accidentalDragAdjustedPoint,
        normalizedRect);
    if (oldDrawAcceptedAsDrag)
        Q_ASSERT (d->dragAccepted);
    if (d->dragAccepted)
    {
    #if DEBUG_KP_TOOL_SELECTION && 1
        kDebug () << "\t\tdrawHasDoneSomething - kill create timer";
    #endif
        // No longer a NOP.
        d->createNOPTimer->stop ();
    }

    // Did we just create a selection?
    if (!hadSelection && document ()->selection ())
        viewManager ()->setSelectionBorderVisible (true);
}

// private slot
void kpAbstractSelectionTool::delayedDrawCreate ()
{
#if DEBUG_KP_TOOL_SELECTION && 1
    kDebug () << "kpAbstractSelectionTool::delayedDrawCreate() hasBegunDraw="
               << hasBegunDraw ()
               << " currentPoint=" << currentPoint ()
               << " lastPoint=" << lastPoint ()
               << " startPoint=" << startPoint ()
               << endl;
#endif

    // (just in case not called from single shot)
    d->createNOPTimer->stop ();

    if (hasBegunDraw ())
    {
        draw (currentPoint (), lastPoint (), normalizedRect ());
    }
}


// private
void kpAbstractSelectionTool::cancelCreate ()
{
#if DEBUG_KP_TOOL_SELECTION
    kDebug () << "\twas creating sel - kill";
#endif

    d->createNOPTimer->stop ();

    // TODO: should we give the user back the selection s/he had before (if any)?
    if (document ()->selection ())
        document ()->selectionDelete ();
}

// private
void kpAbstractSelectionTool::endDrawCreate ()
{
    d->createNOPTimer->stop ();
}


// private
QVariant kpAbstractSelectionTool::operationCreate (Operation op,
        const QVariant &data1, const QVariant &data2)
{
    (void) data1;
    (void) data2;


    switch (op)
    {
    case HaventBegunDrawUserMessage:
        return /*virtual*/haventBegunDrawUserMessageCreate ();

    case SetCursor:
        setCursorCreate ();
        break;

    case BeginDraw:
        beginDrawCreate ();
        break;

    case Draw:
        drawCreate (currentPoint (), normalizedRect ());
        break;

    case Cancel:
        cancelCreate ();
        break;

    case EndDraw:
        endDrawCreate ();
        break;

    default:
        Q_ASSERT (!"Unhandled operation");
        break;
    }


    return QVariant ();
}