/*
    This file is part of EqualizerAPO, a system-wide equalizer.
    Copyright (C) 2015  Jonas Thedering

    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 <sstream>
#include <QDrag>
#include <QElapsedTimer>
#include <QLabel>
#include <QMimeData>
#include <QPushButton>
#include <QStandardItemModel>
#include <QStringBuilder>
#include <QScrollArea>
#include <QFileInfo>
#include <QFileDialog>
#include <QMessageBox>
#include <QProcess>
#include <QSettings>

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <shellapi.h>

#include "helpers/StringHelper.h"
#include "helpers/LogHelper.h"
#include "helpers/ChannelHelper.h"
#include "Editor/helpers/GUIChannelHelper.h"
#include "Editor/helpers/DPIHelper.h"
#include "version.h"
#include "FilterTable.h"
#include "MainWindow.h"
#include "ui_MainWindow.h"

using namespace std;

MainWindow::MainWindow(QDir configDir, QWidget* parent)
	: QMainWindow(parent), ui(new Ui::MainWindow), configDir(configDir)
{
	outputDevices = QList<shared_ptr<AbstractAPOInfo> >::fromVector(QVector<shared_ptr<AbstractAPOInfo> >::fromStdVector(DeviceAPOInfo::loadAllInfos(false)));
	inputDevices = QList<shared_ptr<AbstractAPOInfo> >::fromVector(QVector<shared_ptr<AbstractAPOInfo> >::fromStdVector(DeviceAPOInfo::loadAllInfos(true)));

	defaultOutputDevice = NULL;
	for (shared_ptr<AbstractAPOInfo>& apoInfo : outputDevices)
	{
		if (apoInfo->isDefaultDevice())
		{
			defaultOutputDevice = apoInfo;
			break;
		}
	}

	ui->setupUi(this);
	resize(DPIHelper::scale(QSize(1024, 768)));

	LogHelper::set(stderr, true, false, false);

	QString version = QString("%0.%1").arg(MAJOR).arg(MINOR);
	if (REVISION != 0)
		version += QString(".%0").arg(REVISION);
	setWindowTitle(tr("Equalizer APO %0 Configuration Editor").arg(version));

	QWidget* spacer = new QWidget;
	spacer->setFixedWidth(10);
	ui->mainToolBar->addWidget(spacer);

	instantModeCheckBox = new QCheckBox(tr("Instant mode"));
	instantModeCheckBox->setChecked(true);
	instantModeCheckBox->setToolTip(tr("Changes are saved immediately"));
	connect(instantModeCheckBox, SIGNAL(toggled(bool)), this, SLOT(instantModeEnabled(bool)));
	ui->mainToolBar->addWidget(instantModeCheckBox);

	spacer = new QWidget;
	spacer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
	ui->mainToolBar->addWidget(spacer);

	ui->mainToolBar->addWidget(new QLabel(tr("Device: ")));

	deviceComboBox = new QComboBox;
	connect(deviceComboBox, SIGNAL(activated(int)), this, SLOT(deviceSelected(int)));
	ui->mainToolBar->addWidget(deviceComboBox);

	spacer = new QWidget;
	spacer->setFixedWidth(10);
	ui->mainToolBar->addWidget(spacer);

	ui->mainToolBar->addWidget(new QLabel(tr("Channel configuration: ")));

	channelConfigurationComboBox = new QComboBox;
	channelConfigurationComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
	ui->mainToolBar->addWidget(channelConfigurationComboBox);

	QStandardItemModel* model = qobject_cast<QStandardItemModel*>(deviceComboBox->model());
	if (defaultOutputDevice != NULL)
		deviceComboBox->addItem(tr("Default") + " (" + QString::fromStdWString(defaultOutputDevice->getConnectionName()) + " - " + QString::fromStdWString(defaultOutputDevice->getDeviceName()) + ")", NULL);

	deviceComboBox->addItem(tr("Playback devices:"));
	QStandardItem* item = model->item(model->rowCount() - 1);
	QFont font = item->font();
	font.setBold(true);
	item->setFont(font);
	item->setSelectable(false);

	for (shared_ptr<AbstractAPOInfo>& apoInfo : outputDevices)
		if (apoInfo->isInstalled())
			deviceComboBox->addItem(QString::fromStdWString(apoInfo->getConnectionName()) + " - " + QString::fromStdWString(apoInfo->getDeviceName()), QVariant::fromValue(apoInfo));

	deviceComboBox->addItem(tr("Capture devices:"));
	item = model->item(model->rowCount() - 1);
	item->setFont(font);
	item->setSelectable(false);

	for (shared_ptr<AbstractAPOInfo>& apoInfo : inputDevices)
		if (apoInfo->isInstalled())
			deviceComboBox->addItem(QString::fromStdWString(apoInfo->getConnectionName()) + " - " + QString::fromStdWString(apoInfo->getDeviceName()), QVariant::fromValue(apoInfo));

	connect(channelConfigurationComboBox, SIGNAL(activated(int)), this, SLOT(channelConfigurationSelected(int)));

	analysisPlotScene = new AnalysisPlotScene(ui->graphicsView);
	ui->graphicsView->setScene(analysisPlotScene);

	analysisThread = new AnalysisThread;
	analysisThread->start();
	connect(analysisThread, SIGNAL(analysisFinished()), this, SLOT(updateAnalysisPanel()));

	QLocale autoLocale = QLocale::system();
	if (autoLocale.language() != QLocale::German)
		autoLocale = QLocale("en");
	QLocale::Language languages[] = {QLocale::AnyLanguage, QLocale::English, QLocale::German};
	for (int i = 0; i < sizeof(languages) / sizeof(QLocale::Language); i++)
	{
		QLocale::Language language = languages[i];
		QString languageName;
		if (language == QLocale::AnyLanguage)
			languageName = autoLocale.nativeLanguageName();
		else
			languageName = QLocale(language).nativeLanguageName();
		if (languageName == "American English")
			languageName = "English";
		QString text;
		if (language == QLocale::AnyLanguage)
			text = tr("Automatic (%0)").arg(languageName);
		else
			text = languageName;
		QAction* action = ui->menuLanguage->addAction(text);
		action->setData(language);
		action->setCheckable(true);
		connect(action, SIGNAL(triggered(bool)), this, SLOT(languageSelected(bool)));
	}

	loadPreferences();
}

MainWindow::~MainWindow()
{
	delete ui;

	delete analysisThread;
}

void MainWindow::doChecks()
{
	if (!DeviceAPOInfo::checkProtectedAudioDG(false) || !DeviceAPOInfo::checkAPORegistration(false))
	{
		if (QMessageBox::warning(this, tr("Registry problem"), tr("A registry value that is required for the operation of Equalizer APO is not set correctly.\nDo you want to run the Configurator application to fix the problem?"), QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes)
		{
			runConfigurator();
			return;
		}
	}

	if (defaultOutputDevice != NULL && !defaultOutputDevice->isInstalled())
	{
		if (QMessageBox::warning(this, tr("APO not installed to device"), tr("Equalizer APO has not been installed to the selected device.\nDo you want to run the Configurator application to fix the problem?"), QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes)
		{
			runConfigurator();
			return;
		}
	}

	AbstractAPOInfo* disabledApoInfo = NULL;
	for (shared_ptr<AbstractAPOInfo>& apoInfo : outputDevices)
	{
		if (apoInfo->isInstalled() && apoInfo->isEnhancementsDisabled())
		{
			disabledApoInfo = apoInfo.get();
			break;
		}
	}

	if (disabledApoInfo == NULL)
	{
		for (shared_ptr<AbstractAPOInfo>& apoInfo : inputDevices)
		{
			if (apoInfo->isInstalled() && apoInfo->isEnhancementsDisabled())
			{
				disabledApoInfo = apoInfo.get();
				break;
			}
		}
	}

	if (disabledApoInfo != NULL)
	{
		if (QMessageBox::warning(this, tr("Audio enhancements disabled"), tr("Audio enhancements are not enabled for the device\n%0 %1.\nDo you want to run the Configurator application to fix the problem?").arg(QString::fromStdWString(disabledApoInfo->getConnectionName())).arg(QString::fromStdWString(disabledApoInfo->getDeviceName())), QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes)
		{
			runConfigurator();
			return;
		}
	}
}

void MainWindow::runConfigurator()
{
	// cannot use QProcess::startDetached because of UAC
	wstring file = (QDir::toNativeSeparators(QCoreApplication::applicationDirPath() + "/Configurator.exe")).toStdWString();
	int result = (int)ShellExecuteW(NULL, L"open", file.c_str(), NULL, NULL, SW_SHOWNORMAL);
	if (result == SE_ERR_ACCESSDENIED)
		ShellExecuteW(NULL, L"runas", file.c_str(), NULL, NULL, SW_SHOWNORMAL);
}

void MainWindow::load(QString path)
{
	path = QDir::toNativeSeparators(path);

	for (int i = 0; i < ui->tabWidget->count(); i++)
	{
		QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->widget(i));
		FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());

		if (filterTable->getConfigPath() == path)
		{
			ui->tabWidget->setCurrentIndex(i);
			return;
		}
	}

	QElapsedTimer timer;
	timer.start();

	HANDLE hFile = INVALID_HANDLE_VALUE;
	while (hFile == INVALID_HANDLE_VALUE)
	{
		hFile = CreateFile(path.toStdWString().c_str(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
		if (hFile == INVALID_HANDLE_VALUE)
		{
			DWORD error = GetLastError();
			if (error != ERROR_SHARING_VIOLATION)
			{
				QMessageBox::critical(this, tr("Error"), tr("Error while reading configuration file: %0").arg(QString::fromStdWString(StringHelper::getSystemErrorString(error))));
				return;
			}

			// file is being written, so wait
			Sleep(1);
		}
	}

	stringstream inputStream;

	char buf[8192];
	unsigned long bytesRead = -1;
	while (ReadFile(hFile, buf, sizeof(buf), &bytesRead, NULL) && bytesRead != 0)
	{
		inputStream.write(buf, bytesRead);
	}

	CloseHandle(hFile);

	inputStream.seekg(0);

	QList<QString> lines;
	while (inputStream.good())
	{
		string encodedLine;
		getline(inputStream, encodedLine);
		if (encodedLine.size() > 0 && encodedLine[encodedLine.size() - 1] == '\r')
			encodedLine.resize(encodedLine.size() - 1);

		wstring line = StringHelper::toWString(encodedLine, CP_UTF8);
		if (line.find(L'\uFFFD') != -1)
			line = StringHelper::toWString(encodedLine, CP_ACP);

		lines.append(QString::fromStdWString(line));
	}

	QFileInfo fileInfo(path);
	FilterTable* filterTable = addTab(fileInfo.fileName(), QDir::toNativeSeparators(fileInfo.absoluteFilePath()), path, lines);

	connect(filterTable, SIGNAL(linesChanged()), this, SLOT(linesChanged()));

	qDebug("Loading took %.1f ms", timer.nsecsElapsed() / 1e6);

	ui->tabWidget->setCurrentIndex(ui->tabWidget->count() - 1);

	recentFiles.removeAll(path);
	recentFiles.prepend(path);
	if (recentFiles.size() > 10)
		recentFiles.removeLast();
	updateRecentFiles();
}

void MainWindow::save(FilterTable* filterTable, QString path)
{
	QElapsedTimer timer;
	timer.start();

	QList<QString> lines = filterTable->getLines();

	bool first = true;
	QByteArray byteArray;
	for (QString line : lines)
	{
		if (first)
			first = false;
		else
			byteArray.append("\r\n");
		byteArray.append(line.toUtf8());
	}

	HANDLE hFile = INVALID_HANDLE_VALUE;
	while (hFile == INVALID_HANDLE_VALUE)
	{
		hFile = CreateFile(path.toStdWString().c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
		if (hFile == INVALID_HANDLE_VALUE)
		{
			DWORD error = GetLastError();
			if (error != ERROR_SHARING_VIOLATION)
			{
				QMessageBox::critical(this, tr("Error"), tr("Error while writing configuration file: %0").arg(QString::fromStdWString(StringHelper::getSystemErrorString(error))));
				return;
			}

			// file is being written, so wait
			Sleep(1);
		}
	}

	unsigned long bytesWritten;
	WriteFile(hFile, byteArray.constData(), byteArray.length(), &bytesWritten, NULL);
	if (bytesWritten != byteArray.length())
	{
		// should never happen
		QMessageBox::critical(this, tr("Error"), tr("Only %0/%1 bytes have been written!").arg(bytesWritten).arg(byteArray.length()));
	}

	CloseHandle(hFile);

	qDebug("Saving took %.1f ms", timer.nsecsElapsed() / 1e6);

	startAnalysis();
}

bool MainWindow::isEmpty()
{
	return ui->tabWidget->count() == 0;
}

bool MainWindow::shouldRestart()
{
	return restart;
}

void MainWindow::closeEvent(QCloseEvent* event)
{
	bool canceled = false;
	for (int i = 0; i < ui->tabWidget->count(); i++)
	{
		if (!askForClose(i))
		{
			canceled = true;
			break;
		}
	}

	if (canceled)
	{
		event->ignore();
		restart = false;
		noSavePreferences = false;
		noSaveFilePreferences = false;
	}
	else
	{
		savePreferences();
	}
}

void MainWindow::deviceSelected(int index)
{
	shared_ptr<AbstractAPOInfo> apoInfo = deviceComboBox->itemData(index).value<shared_ptr<AbstractAPOInfo> >();
	if (apoInfo == NULL)
		apoInfo = defaultOutputDevice;

	channelConfigurationComboBox->clear();

	const QList<GUIChannelHelper::ChannelConfigurationInfo>& infos = GUIChannelHelper::getInstance()->getChannelConfigurationInfos();

	if (apoInfo != NULL)
	{
		const GUIChannelHelper::ChannelConfigurationInfo* selectedInfo = NULL;
		for (const GUIChannelHelper::ChannelConfigurationInfo& info : infos)
		{
			if (info.channelMask == apoInfo->getChannelMask())
			{
				selectedInfo = &info;
				break;
			}
		}

		if (selectedInfo != NULL)
			channelConfigurationComboBox->addItem(tr("From device") + " (" + selectedInfo->name + ")", 0);
		else if (apoInfo->getChannelCount() != 0)
			channelConfigurationComboBox->addItem(tr("From device") + " (" + apoInfo->getChannelCount() + " channels)", 0);
		else
			channelConfigurationComboBox->addItem(tr("From device") + " (? channels)", 0);
	}
	else
	{
		channelConfigurationComboBox->addItem(tr("From device") + " (?)", 0);
	}

	for (const GUIChannelHelper::ChannelConfigurationInfo& info : infos)
		channelConfigurationComboBox->addItem(info.name, info.channelMask);

	channelConfigurationSelected(channelConfigurationComboBox->currentIndex());
}

void MainWindow::channelConfigurationSelected(int index)
{
	shared_ptr<AbstractAPOInfo> selectedDevice;
	int channelMask;
	getDeviceAndChannelMask(&selectedDevice, &channelMask);

	for (int i = 0; i < ui->tabWidget->count(); i++)
	{
		QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->widget(i));
		FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
		filterTable->updateDeviceAndChannelMask(selectedDevice, channelMask);
	}

	ui->analysisChannelComboBox->clear();

	if (selectedDevice != NULL)
	{
		unsigned channelCount = selectedDevice->getChannelCount();
		if (channelMask != 0 && channelMask != selectedDevice->getChannelMask())
		{
			channelCount = 0;
			for (int i = 0; i < 31; i++)
			{
				int channelPos = 1 << i;
				if (channelMask & channelPos)
					channelCount++;
			}
		}
		if (channelCount == 0)
		{
			channelCount = 8;
			channelMask = KSAUDIO_SPEAKER_7POINT1_SURROUND;
		}

		vector<wstring> channelNames = ChannelHelper::getChannelNames(channelCount, channelMask);
		for (wstring channelName : channelNames)
		{
			ui->analysisChannelComboBox->addItem(QString::fromStdWString(channelName));
		}
	}

	startAnalysis();
}

void MainWindow::linesChanged()
{
	FilterTable* filterTable = qobject_cast<FilterTable*>(sender());

	if (instantModeCheckBox->isChecked())
	{
		QString configPath = filterTable->getConfigPath();
		if (configPath.length() > 0)
		{
			save(filterTable, configPath);
			return;
		}
	}

	int tabIndex = -1;
	for (int i = 0; i < ui->tabWidget->count(); i++)
	{
		QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->widget(i));
		if (scrollArea->widget() == filterTable)
		{
			tabIndex = i;
			break;
		}
	}
	QString tabText = ui->tabWidget->tabText(tabIndex);
	if (!tabText.endsWith('*'))
	{
		tabText += '*';
		ui->tabWidget->setTabText(tabIndex, tabText);
	}
}

bool MainWindow::on_tabWidget_tabCloseRequested(int index)
{
	if (askForClose(index))
		ui->tabWidget->removeTab(index);
	return true;
}

void MainWindow::on_actionOpen_triggered()
{
	QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
	QString path;
	if (scrollArea != NULL)
	{
		FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
		if (filterTable->getConfigPath().length() > 0)
		{
			QFileInfo fileInfo(filterTable->getConfigPath());
			path = fileInfo.absolutePath();
		}
	}
	if (path.length() == 0)
		path = configDir.absolutePath();

	QFileDialog dialog(this, tr("Open file"), path, "*.txt");
	dialog.setFileMode(QFileDialog::ExistingFiles);
	dialog.setNameFilter(tr("E-APO configurations (*.txt)"));

	if (dialog.exec() == QDialog::Accepted)
	{
		for (QString file : dialog.selectedFiles())
			load(file);
	}
}

void MainWindow::on_actionSave_triggered()
{
	QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
	if (scrollArea == NULL)
		return;

	FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());

	if (filterTable->getConfigPath().length() == 0)
	{
		ui->actionSaveAs->trigger();
	}
	else
	{
		save(filterTable, filterTable->getConfigPath());

		QString tabText = ui->tabWidget->tabText(ui->tabWidget->currentIndex());
		if (tabText.endsWith('*'))
			ui->tabWidget->setTabText(ui->tabWidget->currentIndex(), tabText.left(tabText.length() - 1));
	}
}

void MainWindow::on_actionSaveAs_triggered()
{
	QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
	if (scrollArea == NULL)
		return;

	FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
	QString path;
	QString filename;
	if (filterTable->getConfigPath().length() == 0)
	{
		path = configDir.absolutePath();
	}
	else
	{
		QFileInfo fileInfo(filterTable->getConfigPath());
		path = fileInfo.absolutePath();
		filename = fileInfo.fileName();
	}
	QFileDialog dialog(this, tr("Save file as"), path, "*.txt");
	dialog.setFileMode(QFileDialog::AnyFile);
	dialog.setAcceptMode(QFileDialog::AcceptSave);
	dialog.setNameFilter(tr("E-APO configurations (*.txt)"));
	dialog.setDefaultSuffix(".txt");
	if (filename.length() > 0)
		dialog.selectFile(filename);

	if (dialog.exec() == QDialog::Accepted)
	{
		QString savePath = dialog.selectedFiles().first();
		save(filterTable, savePath);
		filterTable->setConfigPath(QDir::toNativeSeparators(savePath));

		QFileInfo fileInfo(savePath);
		ui->tabWidget->setTabText(ui->tabWidget->currentIndex(), fileInfo.fileName());
		ui->tabWidget->setTabToolTip(ui->tabWidget->currentIndex(), QDir::toNativeSeparators(fileInfo.absoluteFilePath()));
	}
}

void MainWindow::on_actionNew_triggered()
{
	FilterTable* filterTable = addTab(tr("Unsaved"), "", "", QList<QString>());

	connect(filterTable, SIGNAL(linesChanged()), this, SLOT(linesChanged()));
	ui->tabWidget->setCurrentIndex(ui->tabWidget->count() - 1);
}

void MainWindow::recentFileSelected()
{
	QAction* action = qobject_cast<QAction*>(sender());
	load(action->text());
}

void MainWindow::on_actionCut_triggered()
{
	QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
	if (scrollArea == NULL)
		return;

	FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
	filterTable->cut();
}

void MainWindow::on_actionCopy_triggered()
{
	QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
	if (scrollArea == NULL)
		return;

	FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
	filterTable->copy();
}

void MainWindow::on_actionPaste_triggered()
{
	QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
	if (scrollArea == NULL)
		return;

	FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
	filterTable->paste();
}

void MainWindow::on_actionDelete_triggered()
{
	QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
	if (scrollArea == NULL)
		return;

	FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
	filterTable->deleteSelectedLines();
}

void MainWindow::instantModeEnabled(bool enabled)
{
	if (enabled)
	{
		for (int i = 0; i < ui->tabWidget->count(); i++)
		{
			QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->widget(i));
			FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());

			if (filterTable->getConfigPath().length() > 0)
			{
				save(filterTable, filterTable->getConfigPath());

				QString tabText = ui->tabWidget->tabText(i);
				if (tabText.endsWith('*'))
					ui->tabWidget->setTabText(i, tabText.left(tabText.length() - 1));
			}
		}
	}
}

void MainWindow::on_tabWidget_currentChanged(int index)
{
	startAnalysis();
}

void MainWindow::on_startFromComboBox_activated(int index)
{
	startAnalysis();
}

void MainWindow::on_analysisChannelComboBox_activated(int index)
{
	startAnalysis();
}

void MainWindow::on_resolutionSpinBox_valueChanged(int value)
{
	startAnalysis();
}

void MainWindow::updateAnalysisPanel()
{
	analysisThread->beginGetResult();
	int sampleRate = analysisThread->getFreqDataSampleRate();
	int latency = analysisThread->getLatency();
	analysisPlotScene->setFreqData(analysisThread->getFreqData(), analysisThread->getFreqDataLength(), sampleRate);

	double peakGain = analysisThread->getPeakGain();
	ui->peakGainValueLabel->setText(tr("%0 dB").arg(peakGain, 0, 'f', 1));
	ui->peakGainValueLabel->setForegroundRole(peakGain > 0 ? QPalette::Dark : QPalette::WindowText);

	ui->latencyValueLabel->setText(tr("%0 ms (%1 s.)").arg(latency * 1000.0 / sampleRate, 0, 'f', 1).arg(latency));

	ui->initTimeValueLabel->setText(tr("%0 ms").arg(analysisThread->getInitializationTime(), 0, 'f', 1));

	double cpuUsage = analysisThread->getProcessingTime() * 100.0 / (analysisThread->getProcessedFrames() * 1000.0 / sampleRate);
	ui->cpuUsageValueLabel->setText(tr("%0 % (one core)").arg(cpuUsage, 0, 'f', 1));
	ui->cpuUsageValueLabel->setForegroundRole(cpuUsage >= 20 ? (cpuUsage >= 50 ? QPalette::Dark : QPalette::Midlight) : QPalette::WindowText);

	analysisThread->endGetResult();
}

void MainWindow::on_mainToolBar_visibilityChanged(bool visible)
{
	ui->actionToolbar->setChecked(visible);
}

void MainWindow::on_analysisDockWidget_visibilityChanged(bool visible)
{
	ui->actionAnalysisPanel->setChecked(visible);

	if (visible)
		startAnalysis();
}

void MainWindow::on_actionToolbar_triggered(bool checked)
{
	ui->mainToolBar->setVisible(checked);
}

void MainWindow::on_actionAnalysisPanel_triggered(bool checked)
{
	ui->analysisDockWidget->setVisible(checked);
}

void MainWindow::languageSelected(bool selected)
{
	QAction* action = qobject_cast<QAction*>(sender());

	if (!selected)
	{
		action->setChecked(true);
		return;
	}

	QLocale::Language language = (QLocale::Language)action->data().toInt();

	if (QMessageBox::question(this, tr("Restart required"), tr("Configuration Editor will be restarted to apply the changed settings. Proceed?")) == QMessageBox::Yes)
	{
		QSettings settings(QString::fromWCharArray(EDITOR_REGPATH), QSettings::NativeFormat);
		if (language == QLocale::AnyLanguage)
		{
			settings.remove("language");
		}
		else
		{
			QString name = QLocale(language).name();
			int index = name.indexOf('_');
			if (index != -1)
				name = name.left(index);
			settings.setValue("language", name);
		}

		restart = true;
		close();
	}
	else
	{
		action->setChecked(false);
	}
}

void MainWindow::on_actionResetAllGlobalPreferences_triggered()
{
	if (QMessageBox::question(this, tr("Restart required"), tr("Configuration Editor will be restarted to apply the changed settings. Proceed?")) == QMessageBox::Yes)
	{
		QSettings settings(QString::fromWCharArray(EDITOR_REGPATH), QSettings::NativeFormat);
		for (QString key : settings.childGroups())
		{
			if (key != "file-specific")
				settings.remove(key);
		}
		for (QString key : settings.childKeys())
			settings.remove(key);

		restart = true;
		noSavePreferences = true;
		close();
	}
}

void MainWindow::on_actionResetAllFileSpecificPreferences_triggered()
{
	if (QMessageBox::question(this, tr("Restart required"), tr("Configuration Editor will be restarted to apply the changed settings. Proceed?")) == QMessageBox::Yes)
	{
		QSettings settings(QString::fromWCharArray(EDITOR_PER_FILE_REGPATH), QSettings::NativeFormat);
		for (QString key : settings.childGroups())
			settings.remove(key);
		for (QString key : settings.childKeys())
			settings.remove(key);

		restart = true;
		noSaveFilePreferences = true;
		close();
	}
}

FilterTable* MainWindow::addTab(QString title, QString tooltip, QString configPath, QList<QString> lines)
{
	QScrollArea* scrollArea = new QScrollArea(ui->tabWidget);
	scrollArea->setWidgetResizable(true);
	FilterTable* filterTable = new FilterTable(this);
	scrollArea->setWidget(filterTable);
	filterTable->setAcceptDrops(true);
	filterTable->setFocusPolicy(Qt::WheelFocus);

	shared_ptr<AbstractAPOInfo> selectedDevice;
	int channelMask;
	getDeviceAndChannelMask(&selectedDevice, &channelMask);
	filterTable->updateDeviceAndChannelMask(selectedDevice, channelMask);
	filterTable->initialize(scrollArea, outputDevices, inputDevices);
	filterTable->setLines(configPath, lines);

	int tabIndex = ui->tabWidget->addTab(scrollArea, title);
	ui->tabWidget->setTabToolTip(tabIndex, tooltip);

	return filterTable;
}

void MainWindow::getDeviceAndChannelMask(shared_ptr<AbstractAPOInfo>* selectedDevice, int* channelMask)
{
	*selectedDevice = deviceComboBox->currentData().value<shared_ptr<AbstractAPOInfo> >();
	if (*selectedDevice == NULL)
		*selectedDevice = defaultOutputDevice;

	*channelMask = channelConfigurationComboBox->currentData().toInt();
	if (*channelMask == 0 && selectedDevice->get() != NULL)
	{
		*channelMask = (*selectedDevice)->getChannelMask();

		if (*channelMask == 0)
			*channelMask = ChannelHelper::getDefaultChannelMask((*selectedDevice)->getChannelCount());
	}
}

bool MainWindow::askForClose(int tabIndex)
{
	bool discarded = false;
	if (ui->tabWidget->tabText(tabIndex).endsWith('*'))
	{
		ui->tabWidget->setCurrentIndex(tabIndex);
		QString configPath = ui->tabWidget->tabToolTip(tabIndex);
		QMessageBox messageBox;
		messageBox.setWindowTitle(tr("Unsaved changes"));
		messageBox.setText(tr("The configuration file %0 has unsaved changes.").arg(configPath));
		messageBox.setInformativeText(tr("Do you want to save the changes before closing the file?"));
		messageBox.setIcon(QMessageBox::Question);
		messageBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
		messageBox.setDefaultButton(QMessageBox::Save);
		messageBox.setEscapeButton(QMessageBox::Cancel);
		messageBox.setWindowFlags(Qt::Dialog | Qt::CustomizeWindowHint | Qt::WindowTitleHint | Qt::WindowCloseButtonHint);
		int result = messageBox.exec();

		switch (result)
		{
		case QMessageBox::Save:
			ui->actionSave->trigger();
			if (ui->tabWidget->tabText(tabIndex).endsWith('*'))
				// saving was canceled
				return false;
			break;
		case QMessageBox::Discard:
			discarded = true;
			break;
		case QMessageBox::Cancel:
			return false;
		}
	}

	if (!discarded && !noSaveFilePreferences)
	{
		QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->widget(tabIndex));
		if (scrollArea != NULL)
		{
			FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
			filterTable->savePreferences();
		}
	}

	return true;
}

void MainWindow::startAnalysis()
{
	if (!ui->analysisDockWidget->isVisible())
		return;

	shared_ptr<AbstractAPOInfo> selectedDevice;

	int channelMask;
	getDeviceAndChannelMask(&selectedDevice, &channelMask);

	if (selectedDevice != NULL)
	{
		QString configPath;

		if (ui->startFromComboBox->currentIndex() == 1)
		{
			QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->currentWidget());
			if (scrollArea != NULL)
			{
				FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());

				if (filterTable->getConfigPath().length() > 0)
					configPath = filterTable->getConfigPath();
			}
		}

		if (configPath.isEmpty())
			configPath = configDir.absoluteFilePath("config.txt");
		configPath = QDir::toNativeSeparators(configPath);

		analysisThread->setParameters(selectedDevice, channelMask, ui->analysisChannelComboBox->currentIndex(), configPath, ui->resolutionSpinBox->value());
	}
}

void MainWindow::loadPreferences()
{
	QSettings settings(QString::fromWCharArray(EDITOR_REGPATH), QSettings::NativeFormat);
	QVariant geometryValue = settings.value("geometry");
	if (geometryValue.isValid())
		restoreGeometry(geometryValue.toByteArray());
	QVariant stateValue = settings.value("windowState");
	if (stateValue.isValid())
		restoreState(stateValue.toByteArray());
	instantModeCheckBox->setChecked(settings.value("instantMode", true).toBool());
	QString selectedDevice = settings.value("selectedDevice").toString();
	if (!selectedDevice.isEmpty())
	{
		for (int i = 0; i < deviceComboBox->count(); i++)
		{
			shared_ptr<AbstractAPOInfo> apoInfo = deviceComboBox->itemData(i).value<shared_ptr<AbstractAPOInfo> >();
			if (apoInfo != NULL)
			{
				if (QString::fromStdWString(apoInfo->getDeviceString()).compare(selectedDevice, Qt::CaseInsensitive) == 0)
				{
					deviceComboBox->setCurrentIndex(i);
					break;
				}
			}
		}
	}
	deviceSelected(deviceComboBox->currentIndex());

	int selectedChannelMask = settings.value("selectedChannelMask").toInt();
	if (selectedChannelMask != 0)
	{
		int index = channelConfigurationComboBox->findData(selectedChannelMask);
		if (index != -1)
			channelConfigurationComboBox->setCurrentIndex(index);
	}
	channelConfigurationSelected(channelConfigurationComboBox->currentIndex());

	ui->startFromComboBox->setCurrentIndex(settings.value("analysis/startFrom").toInt());
	ui->analysisChannelComboBox->setCurrentText(settings.value("analysis/channel").toString());
	ui->resolutionSpinBox->setValue(settings.value("analysis/resolution", 65536).toInt());
	double zoomX = DPIHelper::scaleZoom(settings.value("analysis/zoomX", 1.0).toDouble());
	double zoomY = DPIHelper::scaleZoom(settings.value("analysis/zoomY", 1.0).toDouble());
	analysisPlotScene->setZoom(zoomX, zoomY);
	bool ok;
	int scrollX = DPIHelper::scale(settings.value("analysis/scrollX").toDouble(&ok));
	if (!ok)
		scrollX = round(analysisPlotScene->hzToX(20));
	int scrollY = DPIHelper::scale(settings.value("analysis/scrollY").toDouble(&ok));
	if (!ok)
		scrollY = round(analysisPlotScene->dbToY(22));

	ui->graphicsView->setScrollOffsets(scrollX, scrollY);

	QVariant openFilesValue = settings.value("openFiles");
	int tabIndex = settings.value("tabIndex").toInt();
	if (openFilesValue.isValid())
	{
		QStringList fileList = openFilesValue.toStringList();
		for (int i = 0; i < fileList.size(); i++)
		{
			load(fileList[i]);
			if (i == tabIndex)
				tabIndex = ui->tabWidget->currentIndex();
		}
	}
	ui->tabWidget->setCurrentIndex(tabIndex);
	recentFiles = settings.value("recentFiles").toStringList();
	updateRecentFiles();

	QVariant languageValue = settings.value("language");
	QLocale::Language language;
	if (languageValue.isValid())
		language = QLocale(languageValue.toString()).language();
	else
		language = QLocale::AnyLanguage;

	for (QAction* action : ui->menuLanguage->actions())
		action->setChecked(action->data().toInt() == language);
}

void MainWindow::savePreferences()
{
	if (noSavePreferences)
		return;

	QSettings settings(QString::fromWCharArray(EDITOR_REGPATH), QSettings::NativeFormat);
	settings.setValue("geometry", saveGeometry());
	settings.setValue("windowState", saveState());
	settings.setValue("instantMode", instantModeCheckBox->isChecked());
	shared_ptr<AbstractAPOInfo> selectedDevice = deviceComboBox->currentData().value<shared_ptr<AbstractAPOInfo> >();
	settings.setValue("selectedDevice", selectedDevice != NULL ? QString::fromStdWString(selectedDevice->getDeviceString()) : "");
	int channelMask = channelConfigurationComboBox->currentData().toInt();
	settings.setValue("selectedChannelMask", channelMask);

	settings.setValue("analysis/startFrom", ui->startFromComboBox->currentIndex());
	settings.setValue("analysis/channel", ui->analysisChannelComboBox->currentText());
	settings.setValue("analysis/resolution", ui->resolutionSpinBox->value());
	settings.setValue("analysis/zoomX", DPIHelper::invScaleZoom(analysisPlotScene->getZoomX()));
	settings.setValue("analysis/zoomY", DPIHelper::invScaleZoom(analysisPlotScene->getZoomY()));
	QScrollBar* hScrollBar = ui->graphicsView->horizontalScrollBar();
	double value = DPIHelper::invScale(hScrollBar->value());
	settings.setValue("analysis/scrollX", value);
	QScrollBar* vScrollBar = ui->graphicsView->verticalScrollBar();
	value = DPIHelper::invScale(vScrollBar->value());
	settings.setValue("analysis/scrollY", value);

	QStringList fileList;
	for (int i = 0; i < ui->tabWidget->count(); i++)
	{
		QScrollArea* scrollArea = qobject_cast<QScrollArea*>(ui->tabWidget->widget(i));
		if (scrollArea == NULL)
			continue;
		FilterTable* filterTable = qobject_cast<FilterTable*>(scrollArea->widget());
		if (filterTable->getConfigPath().length() > 0)
		{
			fileList.append(filterTable->getConfigPath());
		}
	}
	settings.setValue("openFiles", fileList);
	settings.setValue("tabIndex", ui->tabWidget->currentIndex());
	settings.setValue("recentFiles", recentFiles);

	settings.sync();
}

void MainWindow::updateRecentFiles()
{
	QList<QAction*> actions = ui->menuFile->actions();
	int separatorsFound = 0;
	for (int i = actions.size() - 1; i >= 0; i--)
	{
		QAction* action = actions[i];
		if (action->isSeparator())
		{
			separatorsFound++;

			if (separatorsFound == 1)
			{
				QList<QAction*> newActions;
				for (QString recentFile : recentFiles)
				{
					QAction* newAction = new QAction(recentFile, ui->menuFile);
					connect(newAction, SIGNAL(triggered(bool)), this, SLOT(recentFileSelected()));
					newActions.append(newAction);
				}
				ui->menuFile->insertActions(action, newActions);
			}
			else
			{
				break;
			}
		}
		else if (separatorsFound >= 1)
		{
			ui->menuFile->removeAction(action);
		}
	}
}
