/*
** Originally based on the KWorldClock program 
** written by Matthias Hölzer-Klüpfel
** Copyright (C) 1998-2001 by Matthias Hölzer-Klüpfel <hoelzer@kde.org>
**
** Copyright (C) 2008 by Henry de Valence <hdevalence@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 3 of the License, or
** (at your option) any later version.
**
** 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 in a file called COPYING; if not, write to
** the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
** MA 02110-1301, USA.
*/

#include <time.h>
#include <assert.h>

#include <QPainter>
#include <QFontMetrics>
#include <QSizeF>

#include <plasma/theme.h>
#include <plasma/dataengine.h>

#include <kglobal.h>
#include <qimageblitz/qimageblitz.h>
#include <kstandarddirs.h>
#include <kworldclock/maploader.h>
 
#include "plasmamap.h"
//#include "astro.h"
//#include "sunclock.h"

using namespace KWorldClock;

WorldClock::WorldClock(QObject *parent, const QVariantList &args)
	: Plasma::Applet(parent, args)
{
	setDrawStandardBackground(true);
	setSize(400, 200);
}
 
 
WorldClock::~WorldClock()
{
}
 
void WorldClock::connectToEngine()
{
	Plasma::DataEngine* timeEngine = dataEngine("time");
	timeEngine->connectSource("Local", this, 6000, Plasma::AlignToMinute);
}

void WorldClock::init()
{
	connectToEngine();
	m_nextRenderTime = QTime(0,0,0,1);
	//m_nextRenderTime = m_nextRenderTime.addSecs( 60 * 10 ); //move it forwards 10 min
}

void WorldClock::dataUpdated(const QString &name, const Plasma::DataEngine::Data &data)
{
	m_time = data["Time"].toTime();
	update();
}

//much of this is based on the mapwidget code
void WorldClock::calculatePixmap(const QRect& contentsRect, QPixmap& final)
{
	time_t local = time(NULL);
	struct tm *curtime = gmtime(&local);
	int sec = curtime->tm_hour*60*60 + curtime->tm_min*60 + curtime->tm_sec;
	int gmt_position = contentsRect.width() * sec / 86400;

	if( m_nextRenderTime > m_time ) {
		qDebug() << "less than x mins since last calculatePixmap()";
		if(  m_lastContentsRect == contentsRect ) {
			qDebug() << "same size, returning last result";
			final = m_lastRender;
			return;
		} else {
			qDebug() << "scaling old image to new size";
			final = final.scaled(contentsRect.size());
			//final = m_lastRender;
			return;
		} 
	} else {
		qDebug() << "more than x mins since last calculatePixmap()";
	}

	qDebug() << "loading theme 'daynight' width=" << contentsRect.width()
	         << " height=" << contentsRect.height();
	load( static_cast<unsigned int>(contentsRect.width()),
	      "daynight", static_cast<unsigned int>(contentsRect.height()));

	QPixmap map = darkMap();
	QPixmap clean = lightMap();

	qDebug() << "contentsRect = " << contentsRect.size();
	qDebug() << "QPixmap map = " << map.size();
	qDebug() << "QPixmap clean = " << clean.size();

	QPainter mp(&map);
	clean.setAlphaChannel(darkMask(map.width(), map.height()));
	mp.drawPixmap(0,0, clean);

	QPainter p(&final);

	int greenwich = map.width()/2;

	if (gmt_position >= greenwich) {
		p.drawPixmap(gmt_position-greenwich, 0, map);
		p.drawPixmap(0, 0, map, map.width()-gmt_position+greenwich, 0, gmt_position-greenwich, -1);
	} else {
		p.drawPixmap(0,0, map, greenwich-gmt_position, 0, map.width()+gmt_position-greenwich, -1);
		p.drawPixmap(map.width()+gmt_position-greenwich, 0, map, 0, 0, greenwich-gmt_position, -1);
	}

	QTime time = QTime::currentTime();
	p.setPen(Qt::black);
	p.drawText( 0, (final.height() - 10 ), "last rendered at " + time.toString("hh:mm:ss.zzz") );

	m_lastRender = final;
	m_nextRenderTime = time;
	m_nextRenderTime = m_nextRenderTime.addSecs( 60 * 2 ); //move it forwards
	return;
}

void WorldClock::paintInterface(QPainter *p, const QStyleOptionGraphicsItem *option,
                                const QRect &contentsRect)
{
	qDebug() << "updating..";
	p->setRenderHint(QPainter::SmoothPixmapTransform);
	p->setRenderHint(QPainter::Antialiasing);

	QPixmap world(contentsRect.size());
	calculatePixmap(contentsRect, world);
	p->drawPixmap(0,0, world );
	m_lastRender = world;
	QTime time = QTime::currentTime();
	p->setPen(Qt::white);
	p->drawText( 0,0, "last painted at " + time.toString("hh:mm:ss.zzz") );
}

 
#include "plasmamap.moc"