/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2009 Kristian Lehmann <email@thexception.net>

 *

 * 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; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include "bgwidget.h"

#include "hwconsts.h"

SpritePosition::SpritePosition(QWidget * parent, int sw, int sh)

{

    wParent = parent;

    iSpriteWidth = sw;

    iSpriteHeight = sh;

    reset();

}

SpritePosition::~SpritePosition()

{

}

void SpritePosition::move()

{

    fX += fXMov;

    fY += fYMov;

    iAngle += 4;

    if (iAngle >= 360) iAngle = 0;

    if ((fX - fXMov) > wParent->width()) reset();

    else if ((fY - fYMov) > wParent->height()) reset();

}

void SpritePosition::reset()

{

    // random movement values

    fYMov = ((qrand() % 400)+300) / 100.0f;

    fXMov = fYMov * 0.2f+((qrand()%100)/100.0f * 0.6f); //so between 0.2 and 0.8, or 0.5 +/- 0.3

    // random respawn locations

    int tmp = fXMov * (wParent->height() / fYMov);

    fX = (qrand() % (wParent->width() + tmp)) - tmp;

    // adjust respawn location to be next to (but outside) the parent's limits

    if (fX > -iSpriteWidth)

    {

        fY = -1 * iSpriteHeight;

    }

    else

    {

        fY = qrand() % wParent->height();

        fX = -iSpriteWidth;

    }

    // random initial angle

    iAngle = qrand() % 360;

}

QPoint SpritePosition::pos()

{

    return QPoint((int)fX,(int)fY);

}

int SpritePosition::getAngle()

{

    return iAngle;

}

void SpritePosition::init()

{

    fY = qrand() % (wParent->height() + 1);

    fX = qrand() % (wParent->width() + 1);

}

BGWidget::BGWidget(QWidget * parent) : QWidget(parent), enabled(false)

{

    setAttribute(Qt::WA_NoSystemBackground, true);

    QString fname;

    //For each season, there is a replacement for the star (Star.png)

    //Todo: change element for easter and birthday

    //Simply replace Confetti.png and Egg.png with an appropriate graphic)

    switch (season)

    {

        case SEASON_CHRISTMAS :

            fname = "Flake.png";

            break;

        case SEASON_EASTER :

            fname = "Egg.png";

            break;

        case SEASON_HWBDAY :

            fname = "Confetti.png";

            break;

        default :

            fname = "Star.png";

    }

    sprite.load(":/res/" + fname);

    setAutoFillBackground(false);

    for (int i = 0; i < SPRITE_MAX; i++) spritePositions[i] = new SpritePosition(this, sprite.width(), sprite.height());

    for (int i = 0; i < 90; i++)

    {

        rotatedSprites[i] = new QImage(sprite.width(), sprite.height(), QImage::Format_ARGB32);

        rotatedSprites[i]->fill(0);

        QPoint translate(sprite.width()/2, sprite.height()/2);

        QPainter p;

        p.begin(rotatedSprites[i]);

        //  p.setRenderHint(QPainter::Antialiasing);

        p.setRenderHint(QPainter::SmoothPixmapTransform);

        p.translate(translate.x(), translate.y());

        p.rotate(4 * i);

        p.translate(-1*translate.x(), -1*translate.y());

        p.drawImage(0, 0, sprite);

    }

    timerAnimation = new QTimer();

    connect(timerAnimation, SIGNAL(timeout()), this, SLOT(animate()));

    timerAnimation->setInterval(ANIMATION_INTERVAL);

}

BGWidget::~BGWidget()

{

    for (int i = 0; i < SPRITE_MAX; i++) delete spritePositions[i];

    for (int i = 0; i < 90; i++) delete rotatedSprites[i];

    delete timerAnimation;

}

void BGWidget::paintEvent(QPaintEvent *event)

{

    Q_UNUSED(event);

    if (!enabled)

        return;

    QPainter p;

    p.begin(this);

    for (int i = 0; i < SPRITE_MAX; i++)

    {

        QPoint point = spritePositions[i]->pos();

        p.drawImage(point.x(), point.y(), *rotatedSprites[spritePositions[i]->getAngle()/4]);

    }

    p.end();

}

void BGWidget::animate()

{

    if (!enabled)

        return;

    for (int i = 0; i < SPRITE_MAX; i++)

    {

        QPoint oldPos = spritePositions[i]->pos();

        spritePositions[i]->move();

        QPoint newPos = spritePositions[i]->pos();

        int xdiff = newPos.x() - oldPos.x();

        int ydiff = newPos.y() - oldPos.y();

        update(oldPos.x(), oldPos.y(), xdiff+sprite.width(), ydiff+sprite.height());

    }

    //repaint(); // Repaint every frame. Prevents ghosting of widgets if widgets resize in runtime.

}

void BGWidget::startAnimation()

{

    timerAnimation->start();

}

void BGWidget::stopAnimation()

{

    timerAnimation->stop();

    repaint();

}

void BGWidget::init()

{

    for (int i = 0; i < SPRITE_MAX; i++) spritePositions[i]->init();

}