// SPDX-License-Identifier: GPL-2.0+
/*******************************************************************************
 * QtMips - MIPS 32-bit Architecture Subset Simulator
 *
 * Implemented to support following courses:
 *
 *   B35APO - Computer Architectures
 *   https://cw.fel.cvut.cz/wiki/courses/b35apo
 *
 *   B4M35PAP - Advanced Computer Architectures
 *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
 *
 * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
 * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
 *
 * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
 * Czech Technical University        (http://www.cvut.cz/)
 *
 * 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 "latch.h"
#include "coreview_colors.h"
#include <cmath>

using namespace coreview;

//////////////////////
#define WIDTH 7
#define PENW 1
//////////////////////

Latch::Latch(machine::QtMipsMachine *machine, qreal height) : QGraphicsObject(nullptr) {
    this->height = height;

    title = new QGraphicsSimpleTextItem(this);
    QFont font;
    font.setPointSize(6);
    title->setFont(font);

    wedge_animation = new QPropertyAnimation(this, "wedge_clr");
    wedge_animation->setDuration(100);
    wedge_animation->setStartValue(QColor(0, 0, 0));
    wedge_animation->setEndValue(QColor(255, 255, 255));
    wedge_clr = QColor(255, 255, 255);

    connect(machine, SIGNAL(tick()), this, SLOT(tick()));
}

Latch::~Latch() {
    while (!connectors.isEmpty()) {
        ConnectorPair cp = connectors.takeFirst();
        delete cp.in;
        delete cp.out;
    }
    delete wedge_animation;
}

QRectF Latch::boundingRect() const {
    QRectF b(-PENW / 2, -PENW / 2, WIDTH + PENW, height + PENW);
    b |= title->boundingRect();
    return b;
}

void Latch::paint(QPainter *painter, const QStyleOptionGraphicsItem *option __attribute__((unused)), QWidget *widget __attribute__((unused))) {
    QPen pen = painter->pen();
    pen.setColor(BLOCK_OUTLINE_COLOR);
    painter->setPen(pen);

    painter->drawRect(0, 0, WIDTH, height);
    // Now tick rectangle
    const QPointF tickPolygon[] = {
        QPointF(0, 0),
        QPointF(WIDTH, 0),
        QPointF(WIDTH/2, WIDTH/2)
    };
    painter->setBrush(QBrush(wedge_color()));
    painter->drawPolygon(tickPolygon, sizeof(tickPolygon) / sizeof(QPointF));
}

QColor Latch::wedge_color() {
    return wedge_clr;
}

void Latch::set_wedge_color(QColor &c) {
    wedge_clr = c;
    update();
}

void Latch::setTitle(const QString &str) {
    title->setText(str);
    QRectF box = title->boundingRect();
    title->setPos(WIDTH/2 - box.width()/2, - box.height() - 1);
}

void Latch::setPos(qreal x, qreal y) {
    QGraphicsObject::setPos(x, y);
    for (int i = 0; i < connectors.size(); i++) {
        connectors[i].in->setPos(x, y + connectors_off[i]);
        connectors[i].out->setPos(x + WIDTH, y + connectors_off[i]);
    }
}

struct Latch::ConnectorPair Latch::new_connector(qreal cy) {
    SANITY_ASSERT(cy < height, "Latch: Trying to create connector outside of latch height");
    ConnectorPair cp;
    cp.in = new Connector(Connector::AX_X);
    cp.out = new Connector(Connector::AX_X);
    connectors.append(cp);
    connectors_off.append(cy);
    setPos(x(), y()); // Update connectors position
    return cp;
}

void Latch::tick() {
    wedge_clr = QColor(0, 0, 0);
    wedge_animation->start();
    update();
}