/***************************************************************************
 *   Copyright (C) 2003 by David Saxton                                    *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   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.                                   *
 ***************************************************************************/

#include "ec555.h"

#include "ecnode.h"
#include "libraryitem.h"
#include "pin.h"
#include "resistance.h"

#include <KLocalizedString>
#include <QPainter>

Item* EC555::construct( ItemDocument *itemDocument, bool newItem, const char *id )
{
	return new EC555( (ICNDocument*)itemDocument, newItem, id );
}

LibraryItem* EC555::libraryItem()
{
	return new LibraryItem(
		QStringList(QString("ec/555")),
		i18n("555"),
		i18n("Integrated Circuits"),
		"ic1.png",
		LibraryItem::lit_component,
		EC555::construct );
}

EC555::EC555( ICNDocument *icnDocument, bool newItem, const char *id )
	: Component( icnDocument, newItem, (id) ? id : "555" )
{
	m_name = i18n("555");
// 	m_pins = QStringList::split( ',', "Gnd,Trg,Out,Res,CV,Th,Dis,Vcc" );
// 	m_pins = QStringList::split( ',', "Dis,Th,Trg,Gnd,CV,Out,Res,Vcc" );
	
	old_com1 = false;
	old_com2 = false;
	old_q = false;
	
	setSize( -32, -32, 64, 64 );

	// Pins down left
	
	// Pin 7
	discharge = createPin( -40, -16, 0, "Dis" )->pin();
	addDisplayText( "dis", QRect( -32, -24, 24, 16 ), "Dis" );
	
	// Pin 6
	threshold = createPin( -40, 0, 0, "Th" )->pin();
	addDisplayText( "th", QRect( -32, -8, 24, 16 ), "Th" );
	
	// Pin 2
	trigger = createPin( -40, 16, 0, "Trg" )->pin();
	addDisplayText( "trg", QRect( -32, 8, 24, 16 ), "Trg" );

	// Top two
	
	// Pin 8
	vcc = createPin( -16, -40, 90, "Vcc" )->pin();
	addDisplayText( "vcc", QRect( -24, -32, 16, 8 ), "+" );
	
	// Pin 4
	reset = createPin( 16, -40, 90, "Res" )->pin();
	addDisplayText( "res", QRect( 8, -28, 16, 16 ), "Res" );
	
	// Bottom two
	
	// Pin 1
	ground = createPin( -16, 40, 270, "Gnd" )->pin();
	addDisplayText( "gnd", QRect( -24, 20, 16, 8 ), "-" );
	
	// Pin 5
	control = createPin( 16, 40, 270, "CV" )->pin();
	addDisplayText( "cv", QRect( 8, 12, 16, 16 ), "CV" );
	
	// Output on right
	
	// Pin 3
	output = createPin( 40, 0, 180, "Out" )->pin();
	addDisplayText( "out", QRect( 8, -8, 16, 16 ), "Out" );
	
	m_r1 = createResistance( vcc, control, 5e3 );
	m_r23 = createResistance( control, ground, 1e4 );
	m_po_sink = createResistance( output, ground, 0. );
	m_po_source = createResistance( output, vcc, 0. );
	m_po_source->setConductance(0.);
	m_r_discharge = createResistance( discharge, ground, 0. );
}

EC555::~EC555()
{
}

// TODO: This is simulation code not UI code, so it shouldn't be here.
// Would it be better to simulate the appropriate elements, ie comparator, voltage divider,
// and flip-flop instead of all this hand-wavy logic?

void EC555::stepNonLogic()
{
	double v_threshold = threshold->voltage();
	double v_control = control->voltage();
	double v_ground = ground->voltage();
	double v_trigger = trigger->voltage();
	double v_reset = reset->voltage();
	double v_vcc = vcc->voltage();
	double v_r = (v_control+v_ground)/2;
	
	bool com1 = (v_threshold == v_control ) ? old_com1 : ( v_threshold < v_control );
	bool com2 = (v_r == v_trigger )         ? old_com2 : ( v_r > v_trigger );
	bool reset = v_reset >= (v_control - v_ground) / 2 + v_ground;

	old_com1 = com1;
	old_com2 = com2;
	
	bool r = !(reset && com1);
	bool s = com2;
	bool q = old_q;

	if ( v_vcc - v_ground >= 2.5 ) {
		if ( s && !r ) {
			q = true;
		} else if ( r && !s ) {
			q = false;
		}
	} else {
		q = false;
	}

	old_q = q;
	m_r_discharge->setConductance(0.);
	
	if (q) {
		m_po_source->setResistance(10.);
		m_po_sink->setConductance(0.);
	} else {
		m_po_source->setConductance(0.);
		m_po_sink->setResistance(10.);

		if ( v_ground+0.7 <= v_vcc ) {
			m_r_discharge->setResistance(10.);
		}
	}
}

