/*
 * Copyright 2010  Niels Kummerfeldt <niels.kummerfeldt@tu-harburg.de>
 *
 * 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.
 *
 * 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 Street, Fifth Floor,
 * Boston, MA  02110-1301  USA
 */

#include "batterylayer.h"

#include "mapwidget.h"

#include <QtCore/QDebug>
#include <QtCore/QFile>
//#include <QtCore/QFileSystemWatcher>
#include <QtCore/QTextStream>
#include <QtCore/QTime>

BatteryLayer::BatteryLayer(MapWidget *map) :
    AbstractLayer(map),
    m_updateTimer(new QTimer(this)),
    m_percent(0),
    m_isCharging(false)
{
    m_updateTimer->setInterval(60 * 1000);
    connect(m_updateTimer, SIGNAL(timeout()), this, SLOT(repaint()));
    m_updateTimer->start();

//    QFileSystemWatcher *w = new QFileSystemWatcher(this);
//    w->addPath("/sys/class/power_supply/battery/capacity");
//    w->addPath("/sys/class/power_supply/battery/status");
//    connect(w, SIGNAL(fileChanged(QString)), this, SLOT(fileChanged(QString)));

    repaint();
}

void BatteryLayer::keyPressed(QKeyEvent *event)
{
    if (event->modifiers() == Qt::NoModifier &&
        event->key() == Qt::Key_B) {
        toggleVisibility();
    }
}

void BatteryLayer::paint(QPainter *painter)
{
    int w = map()->width();
    int h = map()->height();

    painter->setBrush(QBrush(QColor(255, 255, 255, 210)));
    painter->drawRoundedRect(w - 111, h - 17, 110, 16, 5, 5);
    painter->drawText(w - 101, h - 15, 90, 14, Qt::AlignCenter, QString("%1%").arg(m_percent));
    if (m_isCharging) {
        painter->setBrush(QBrush(QColor(0, 255, 0, 110)));
    } else {
        painter->setBrush(QBrush(QColor(0, 0, 255, 110)));
    }
    painter->drawRoundedRect(w - 111, h - 17, 10 + m_percent, 16, 5, 5);
}

void BatteryLayer::repaint()
{
    if (isVisible()) {
        int percent = m_percent;
        QFile capacity("/sys/class/power_supply/battery/capacity");
        if (capacity.open(QFile::ReadOnly | QFile::Text)) {
            QTextStream in(&capacity);
            QString l = in.readLine();
            percent = l.toInt();
        }

        bool charging = m_isCharging;
        QFile status("/sys/class/power_supply/battery/status");
        if (status.open(QFile::ReadOnly | QFile::Text)) {
            QTextStream in(&status);
            QString l = in.readLine().toLower();
            charging = (l == "charging");
        }

        if (charging != m_isCharging || percent != m_percent) {
            m_percent = percent;
            m_isCharging = charging;
            map()->update();
        }
    }
}

void BatteryLayer::fileChanged(const QString &filename)
{
    qDebug() << filename;
    repaint();
}