// 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 "cop0dock.h"


Cop0Dock::Cop0Dock(QWidget *parent) : QDockWidget(parent) {
    scrollarea = new QScrollArea(this);
    scrollarea->setWidgetResizable(true);
    widg = new StaticTable(scrollarea);

#define INIT(X, LABEL) do{ \
        X = new QLabel("0x00000000", widg); \
        X->setFixedSize(X->sizeHint()); \
        X->setText(""); \
        X->setTextInteractionFlags(Qt::TextSelectableByMouse); \
        widg->addRow({new QLabel(LABEL, widg), X}); \
    } while(false)

    cop0reg[0] = nullptr;
    for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++) {
        INIT(cop0reg[i], machine::Cop0State::cop0reg_name((machine::Cop0State::Cop0Registers)i));
        cop0reg_highlighted[i] = false;
    }
#undef INIT
    scrollarea->setWidget(widg);

    setWidget(scrollarea);
    setObjectName("Coprocessor0");
    setWindowTitle("Coprocessor0");

    pal_normal = QPalette(cop0reg[1]->palette());
    pal_updated = QPalette(cop0reg[1]->palette());
    pal_read = QPalette(cop0reg[1]->palette());
    pal_normal.setColor(QPalette::WindowText, QColor(0, 0, 0));
    pal_updated.setColor(QPalette::WindowText, QColor(240, 0, 0));
    pal_read.setColor(QPalette::WindowText, QColor(0, 0, 240));
    cop0reg_highlighted_any = false;
}

Cop0Dock::~Cop0Dock() {
    for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++)
        delete cop0reg[i];
    delete widg;
    delete scrollarea;
}

void Cop0Dock::setup(machine::QtMipsMachine *machine) {
    if (machine == nullptr) {
        // Reset data
        for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++)
            cop0reg[i]->setText("");
        return;
    }

    const machine::Cop0State *cop0state = machine->cop0state();

    for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++)
        labelVal(cop0reg[i], cop0state->read_cop0reg((machine::Cop0State::Cop0Registers)i));

    connect(cop0state, &machine::Cop0State::cop0reg_update,
            this, &Cop0Dock::cop0reg_changed);
    connect(cop0state, &machine::Cop0State::cop0reg_read,
            this, &Cop0Dock::cop0reg_read);
    connect(machine, SIGNAL(tick()), this, SLOT(clear_highlights()));
}

void Cop0Dock::cop0reg_changed(enum machine::Cop0State::Cop0Registers reg, std::uint32_t val) {
    SANITY_ASSERT((uint)reg < machine::Cop0State::COP0REGS_CNT && (uint)reg,
                  QString("Cop0Dock received signal with invalid cop0 register: ") +
                  QString::number((uint)reg));
    labelVal(cop0reg[(uint)reg], val);
    cop0reg[reg]->setPalette(pal_updated);
    cop0reg_highlighted[reg] = true;
    cop0reg_highlighted_any = true;
}

void Cop0Dock::cop0reg_read(enum machine::Cop0State::Cop0Registers reg, std::uint32_t val) {
    (void)val;
    SANITY_ASSERT((uint)reg < machine::Cop0State::COP0REGS_CNT && (uint)reg,
                  QString("Cop0Dock received signal with invalid cop0 register: ") +
                  QString::number((uint)reg));
    if (!cop0reg_highlighted[reg])
        cop0reg[reg]->setPalette(pal_read);
    cop0reg_highlighted[reg] = true;
    cop0reg_highlighted_any = true;
}

void Cop0Dock::clear_highlights() {
    if (!cop0reg_highlighted_any)
        return;
    for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++) {
        if (cop0reg_highlighted[i]) {
            cop0reg[i]->setPalette(pal_normal);
            cop0reg_highlighted[i] = false;
        }
    }
    cop0reg_highlighted_any = false;
}

void Cop0Dock::labelVal(QLabel *label, std::uint32_t value) {
    QString t = QString("0x") + QString::number(value, 16);
    label->setText(t);
}