/*  ColorHistory.cpp
 *
 *  Copyright (C) 2014  Jim Evins <evins@snaught.com>
 *
 *  This file is part of gLabels-qt.
 *
 *  gLabels-qt 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.
 *
 *  gLabels-qt 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 gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "ColorHistory.h"

#include <QSettings>


namespace glabels
{

	ColorHistory::ColorHistory()
	{
	}


	ColorHistory* ColorHistory::instance()
	{
		static ColorHistory* singletonInstance = 0;

		if ( singletonInstance == 0 )
		{
			singletonInstance = new ColorHistory();
		}

		return singletonInstance;
	}


	void ColorHistory::addColor( const QColor &color )
	{
		QColor oldColors[MAX_COLORS];
		QColor newColors[MAX_COLORS];
		int n;

		readColorArray( oldColors, &n );

		int i;
		newColors[0] = color;
		for ( i = 0; ( i < (MAX_COLORS-1) ) && (i < n); i++ )
		{
			newColors[i+1] = oldColors[i];
		}

		writeColorArray( newColors, i+1 );
		emit changed();
	}


	QColor ColorHistory::getColor( int i )
	{
		QColor colors[MAX_COLORS];
		int n;

		readColorArray( colors, &n );
		
		if ( (n > 0) && (i < n) )
		{
			return colors[i];
		}
		else
		{
			return QColor( 0, 0, 0, 0 );
		}
	}


	void ColorHistory::readColorArray( QColor array[MAX_COLORS], int* n )
	{
		QSettings settings;

		settings.beginGroup( "ColorHistory" );

		settings.beginReadArray( "history" );
		*n = settings.value( "history/size", 0 ).toInt();
		for ( int i = 0; i < *n; i++ )
		{
			settings.setArrayIndex(i);
			array[i] = settings.value( "color" ).value<QColor>();
		}
		settings.endArray();

		settings.endGroup();
	}


	void ColorHistory::writeColorArray( const QColor array[MAX_COLORS], int n )
	{
		QSettings settings;

		settings.beginGroup( "ColorHistory" );

		settings.beginWriteArray( "history" );
		for ( int i = 0; (i < n) && (i < MAX_COLORS); i++ )
		{
			settings.setArrayIndex(i);
			settings.setValue( "color", array[i] );
		}
		settings.endArray();

		settings.endGroup();
	}

}