/*
 * Copyright 2003-2010, Haiku, Inc. All Rights Reserved.
 * Copyright 2004-2005 yellowTAB GmbH. All Rights Reserverd.
 * Copyright 2006 Bernd Korz. All Rights Reserved
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Fernando Francisco de Oliveira
 *              Michael Wilber
 *              Michael Pfeiffer
 *              Ryan Leavengood
 *              yellowTAB GmbH
 *              Bernd Korz
 *              Stephan Aßmus <superstippi@gmx.de>
 */


#include "SelectionBox.h"

#include <math.h>
#include <new>
#include <stdio.h>

#include "ShowImageView.h"


SelectionBox::SelectionBox()
        :
        fBounds()
{
        _InitPatterns();
}


SelectionBox::~SelectionBox()
{
}


void
SelectionBox::SetBounds(ShowImageView* view, BRect bounds)
{
        view->ConstrainToImage(bounds);

        if (fBounds == bounds)
                return;

        BRect dirtyOld = _RectInView(view);

        fBounds = bounds;

        BRect dirtyNew = _RectInView(view);

        if (dirtyOld.IsValid() && dirtyNew.IsValid())
                view->Invalidate(dirtyOld | dirtyNew);
        else if (dirtyOld.IsValid())
                view->Invalidate(dirtyOld);
        else if (dirtyNew.IsValid())
                view->Invalidate(dirtyNew);
}


BRect
SelectionBox::Bounds() const
{
        return fBounds;
}


void
SelectionBox::MouseDown(ShowImageView* view, BPoint where)
{
        // TODO: Allow to re-adjust corners.
        where = view->ViewToImage(where);
        SetBounds(view, BRect(where, where));
}


void
SelectionBox::MouseMoved(ShowImageView* view, BPoint where)
{
        // TODO: Allow to re-adjust corners.
        where = view->ViewToImage(where);

        BRect bounds(fBounds);

        if (where.x >= bounds.left)
                bounds.right = where.x;
        else
                bounds.left = where.x;

        if (where.y >= bounds.top)
                bounds.bottom = where.y;
        else
                bounds.top = where.y;

        SetBounds(view, bounds);
}


void
SelectionBox::MouseUp(ShowImageView* view, BPoint where)
{
}


void
SelectionBox::Animate()
{
        // rotate up
        uchar p = fPatternUp.data[0];
        for (int i = 0; i <= 6; i++)
                fPatternUp.data[i] = fPatternUp.data[i + 1];
        fPatternUp.data[7] = p;

        // rotate down
        p = fPatternDown.data[7];
        for (int i = 7; i >= 1; i--)
                fPatternDown.data[i] = fPatternDown.data[i - 1];
        fPatternDown.data[0] = p;

        // rotate to left
        p = fPatternLeft.data[0];
        bool set = (p & 0x80) != 0;
        p <<= 1;
        p &= 0xfe;
        if (set)
                p |= 1;
        memset(fPatternLeft.data, p, 8);

        // rotate to right
        p = fPatternRight.data[0];
        set = (p & 1) != 0;
        p >>= 1;
        if (set)
                p |= 0x80;
        memset(fPatternRight.data, p, 8);
}


void
SelectionBox::Draw(ShowImageView* view, const BRect& updateRect) const
{
        BRect r = _RectInView(view);
        if (!r.IsValid() || !updateRect.Intersects(r))
                return;

        view->PushState();

        view->SetLowColor(255, 255, 255);
        view->StrokeLine(BPoint(r.left, r.top), BPoint(r.right, r.top),
                fPatternLeft);
        view->StrokeLine(BPoint(r.right, r.top + 1), BPoint(r.right, r.bottom - 1),
                fPatternUp);
        view->StrokeLine(BPoint(r.left, r.bottom), BPoint(r.right, r.bottom),
                fPatternRight);
        view->StrokeLine(BPoint(r.left, r.top + 1), BPoint(r.left, r.bottom - 1),
                fPatternDown);

        view->PopState();
}


// #pragma mark -


void
SelectionBox::_InitPatterns()
{
        uchar p;
        uchar p1 = 0x33;
        uchar p2 = 0xCC;
        for (int i = 0; i <= 7; i++) {
                fPatternLeft.data[i] = p1;
                fPatternRight.data[i] = p2;
                if ((i / 2) % 2 == 0)
                        p = 255;
                else
                        p = 0;
                fPatternUp.data[i] = p;
                fPatternDown.data[i] = ~p;
        }
}


BRect
SelectionBox::_RectInView(ShowImageView* view) const
{
        BRect r;
        if (fBounds.Height() <= 0.0 || fBounds.Width() <= 0.0)
                return r;

        r = fBounds;
        // Layout selection rect in view coordinate space
        view->ConstrainToImage(r);
        r = view->ImageToView(r);
        // draw selection box *around* selection
        r.InsetBy(-1, -1);

        return r;
}