// d2if
// Copyright (C) 2012 xaizek.
//
// 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 "Display.hpp"

#include <fstream>
#include <sstream>
#include <string>

Display::Display(const ColorScheme& colorScheme)
    : Field(colorScheme)
{
    setVisible(false);
    initialBrightness = getDisplayBrightness();
}

void Display::update()
{
    const int actualBrightness { getDisplayBrightness() };

    if (actualBrightness != initialBrightness && !isVisible()) {
        setVisible(true);
    }

    if (!isVisible()) {
        return;
    }

    std::ostringstream result;

    result << "DB: " << actualBrightness << "%";

    Field::setText(result.str());
}

int Display::getDisplayBrightness() const
{
    std::ifstream max {
        "/sys/class/backlight/acpi_video0/max_brightness"
    };
    std::ifstream actual {
        "/sys/class/backlight/acpi_video0/actual_brightness"
    };
    if (max.is_open() && actual.is_open()) {
        int maxValue;
        max >> maxValue;

        int actualValue;
        actual >> actualValue;

        return ((100*actualValue)/maxValue);
    } else {
        return -1;
    }
}