/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2022  PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 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 PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include "PrecompiledHeader.h"

#include <QtWidgets/QMessageBox>
#include <algorithm>

#include "EmuThread.h"
#include "QtUtils.h"
#include "SettingWidgetBinder.h"
#include "SettingsDialog.h"
#include "SystemSettingsWidget.h"

static constexpr int MINIMUM_EE_CYCLE_RATE = -3;
static constexpr int MAXIMUM_EE_CYCLE_RATE = 3;
static constexpr int DEFAULT_EE_CYCLE_RATE = 0;
static constexpr int DEFAULT_EE_CYCLE_SKIP = 0;

SystemSettingsWidget::SystemSettingsWidget(QWidget* parent, SettingsDialog* dialog)
	: QWidget(parent)
{
	m_ui.setupUi(this);

	SettingWidgetBinder::BindWidgetToIntSetting(m_ui.eeRoundingMode, "EmuCore/CPU", "FPU.Roundmode", 3);
	m_ui.eeClampMode->setCurrentIndex(getClampingModeIndex(false));
	connect(m_ui.eeClampMode, QOverload<int>::of(&QComboBox::currentIndexChanged),
		[this](int index) { setClampingMode(false, index); });
	m_ui.eeCycleRate->setCurrentIndex(
		std::clamp(QtHost::GetBaseIntSettingValue("EmuCore/Speedhacks", "EECycleRate", DEFAULT_EE_CYCLE_RATE),
			MINIMUM_EE_CYCLE_RATE, MAXIMUM_EE_CYCLE_RATE) +
		(0 - MINIMUM_EE_CYCLE_RATE));
	connect(m_ui.eeCycleRate, QOverload<int>::of(&QComboBox::currentIndexChanged), [](int index) {
		QtHost::SetBaseIntSettingValue("EmuCore/Speedhacks", "EECycleRate", MINIMUM_EE_CYCLE_RATE + index);
		g_emu_thread->applySettings();
	});
	SettingWidgetBinder::BindWidgetToIntSetting(m_ui.eeCycleSkipping, "EmuCore/Speedhacks", "EECycleSkip", 0);

	SettingWidgetBinder::BindWidgetToBoolSetting(m_ui.MTVU, "EmuCore/Speedhacks", "vuThread", false);
	SettingWidgetBinder::BindWidgetToBoolSetting(m_ui.instantVU1, "EmuCore/Speedhacks", "vu1Instant", true);
	SettingWidgetBinder::BindWidgetToIntSetting(m_ui.vuRoundingMode, "EmuCore/CPU", "VU.Roundmode", 3);
	m_ui.vuClampMode->setCurrentIndex(getClampingModeIndex(true));
	connect(m_ui.vuClampMode, QOverload<int>::of(&QComboBox::currentIndexChanged),
		[this](int index) { setClampingMode(true, index); });

	SettingWidgetBinder::BindWidgetToBoolSetting(m_ui.fastCDVD, "EmuCore/Speedhacks", "fastCDVD", false);

	updateVU1InstantState();
	connect(m_ui.MTVU, &QCheckBox::stateChanged, this, &SystemSettingsWidget::updateVU1InstantState);
}

SystemSettingsWidget::~SystemSettingsWidget() = default;

void SystemSettingsWidget::updateVU1InstantState()
{
	m_ui.instantVU1->setEnabled(!m_ui.MTVU->isChecked());
}

int SystemSettingsWidget::getClampingModeIndex(bool vu)
{
	if (QtHost::GetBaseBoolSettingValue("EmuCore/CPU/Recompiler", vu ? "vuSignOverflow" : "fpuFullMode", false))
		return 3;
	if (QtHost::GetBaseBoolSettingValue("EmuCore/CPU/Recompiler", vu ? "vuExtraOverflow" : "fpuExtraOverflow", false))
		return 2;
	if (QtHost::GetBaseBoolSettingValue("EmuCore/CPU/Recompiler", vu ? "vuOverflow" : "fpuOverflow", true))
		return 1;
	return 0;
}

void SystemSettingsWidget::setClampingMode(bool vu, int index)
{
	QtHost::SetBaseBoolSettingValue("EmuCore/CPU/Recompiler", vu ? "vuSignOverflow" : "fpuFullMode", (index >= 3));
	QtHost::SetBaseBoolSettingValue("EmuCore/CPU/Recompiler", vu ? "vuExtraOverflow" : "fpuExtraOverflow", (index >= 2));
	QtHost::SetBaseBoolSettingValue("EmuCore/CPU/Recompiler", vu ? "vuOverflow" : "fpuOverflow", (index >= 1));
	g_emu_thread->applySettings();
}