#include "BackupDialog.h"

#include "BackupFormatModel.h"

#include <QFileDialog>
#include <QMessageBox>
#include <QProcess>
#include <QScrollBar>
#include <QStandardPaths>

#include <QApplication>
#include <QCheckBox>
#include <QComboBox>
#include <QDialog>
#include <QFormLayout>
#include <QHBoxLayout>
#include <QLabel>
#include <QLineEdit>
#include <QPlainTextEdit>
#include <QPushButton>
#include <QSpinBox>
#include <QTabWidget>
#include <QVBoxLayout>
#include <QWidget>


#ifdef WIN32
# include <windows.h> // for CreateProcess flags
#endif

QPlainTextEdit* createStdOutput(QWidget *parent)
{
	auto stdOutput = new QPlainTextEdit(parent);
	stdOutput->setObjectName(QString::fromUtf8("stdOutput"));
	QPalette palette;
	QBrush brush(QColor(255, 255, 255, 255));
	brush.setStyle(Qt::SolidPattern);
	palette.setBrush(QPalette::Active, QPalette::Text, brush);
	QBrush brush1(QColor(0, 0, 0, 255));
	brush1.setStyle(Qt::SolidPattern);
	palette.setBrush(QPalette::Active, QPalette::Base, brush1);
	palette.setBrush(QPalette::Inactive, QPalette::Text, brush);
	palette.setBrush(QPalette::Inactive, QPalette::Base, brush1);
	QBrush brush2(QColor(120, 120, 120, 255));
	brush2.setStyle(Qt::SolidPattern);
	palette.setBrush(QPalette::Disabled, QPalette::Text, brush2);
	QBrush brush3(QColor(240, 240, 240, 255));
	brush3.setStyle(Qt::SolidPattern);
	palette.setBrush(QPalette::Disabled, QPalette::Base, brush3);
	stdOutput->setPalette(palette);
	QFont font;
	font.setFamily(QString::fromUtf8("Source Code Pro"));
	font.setPointSize(10);
	stdOutput->setFont(font);
	stdOutput->setLineWrapMode(QPlainTextEdit::NoWrap);
	stdOutput->setReadOnly(true);
	return stdOutput;
}

BackupDialog::BackupDialog(QWidget *parent)
	: QDialog(parent)
{

	btnStart = new QPushButton(this);
	btnStart->setObjectName(QString::fromUtf8("btnStart"));
	btnStart->setGeometry(QRect(270, 630, 75, 23));

	tabWidget = new QTabWidget(this);
	tabWidget->setObjectName(QString::fromUtf8("tabWidget"));
	tabWidget->setGeometry(QRect(30, 90, 601, 501));

	tab = new QWidget();
	tab->setObjectName(QString::fromUtf8("tab"));

	verticalLayout = new QVBoxLayout(tab);
	verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));

	formLayout = new QFormLayout();
	formLayout->setObjectName(QString::fromUtf8("formLayout"));

	label = new QLabel(tab);
	label->setObjectName(QString::fromUtf8("label"));

	formLayout->setWidget(0, QFormLayout::LabelRole, label);

	widget = new QWidget(tab);
	widget->setObjectName(QString::fromUtf8("widget"));
	horizontalLayout = new QHBoxLayout(widget);
	horizontalLayout->setSpacing(0);
	horizontalLayout->setObjectName(QString::fromUtf8("horizontalLayout"));
	horizontalLayout->setContentsMargins(0, 0, 0, 0);
	editFilename = new QLineEdit(widget);
	editFilename->setObjectName(QString::fromUtf8("editFilename"));

	horizontalLayout->addWidget(editFilename);

	selectDestination = new QPushButton(widget);
	selectDestination->setObjectName(QString::fromUtf8("selectDestination"));

	horizontalLayout->addWidget(selectDestination);


	formLayout->setWidget(0, QFormLayout::FieldRole, widget);

	label_2 = new QLabel(tab);
	label_2->setObjectName(QString::fromUtf8("label_2"));

	formLayout->setWidget(1, QFormLayout::LabelRole, label_2);

	backupFormat = new QComboBox(tab);
	backupFormat->setObjectName(QString::fromUtf8("backupFormat"));
	backupFormat->setModelColumn(0);

	formLayout->setWidget(1, QFormLayout::FieldRole, backupFormat);

	label_3 = new QLabel(tab);
	label_3->setObjectName(QString::fromUtf8("label_3"));

	formLayout->setWidget(2, QFormLayout::LabelRole, label_3);

	jobs = new QSpinBox(tab);
	jobs->setObjectName(QString::fromUtf8("jobs"));

	formLayout->setWidget(2, QFormLayout::FieldRole, jobs);

	chkbxVerbose = new QCheckBox(tab);
	chkbxVerbose->setObjectName(QString::fromUtf8("chkbxVerbose"));

	formLayout->setWidget(3, QFormLayout::FieldRole, chkbxVerbose);

	label_5 = new QLabel(tab);
	label_5->setObjectName(QString::fromUtf8("label_5"));

	formLayout->setWidget(4, QFormLayout::LabelRole, label_5);

	compression = new QSpinBox(tab);
	compression->setObjectName(QString::fromUtf8("compression"));
	compression->setMinimum(-1);
	compression->setMaximum(9);
	compression->setValue(-1);

	formLayout->setWidget(4, QFormLayout::FieldRole, compression);

	chkbxIncludeBlobs = new QCheckBox(tab);
	chkbxIncludeBlobs->setObjectName(QString::fromUtf8("chkbxIncludeBlobs"));

	formLayout->setWidget(6, QFormLayout::FieldRole, chkbxIncludeBlobs);

	chkbxClean = new QCheckBox(tab);
	chkbxClean->setObjectName(QString::fromUtf8("chkbxClean"));

	formLayout->setWidget(7, QFormLayout::FieldRole, chkbxClean);

	chkbxCreate = new QCheckBox(tab);
	chkbxCreate->setObjectName(QString::fromUtf8("chkbxCreate"));

	formLayout->setWidget(8, QFormLayout::FieldRole, chkbxCreate);

	noOwner = new QCheckBox(tab);
	noOwner->setObjectName(QString::fromUtf8("noOwner"));

	formLayout->setWidget(9, QFormLayout::FieldRole, noOwner);

	oids = new QCheckBox(tab);
	oids->setObjectName(QString::fromUtf8("oids"));

	formLayout->setWidget(10, QFormLayout::FieldRole, oids);

	what = new QComboBox(tab);
	what->addItem(QString());
	what->addItem(QString());
	what->addItem(QString());
	what->setObjectName(QString::fromUtf8("what"));

	formLayout->setWidget(5, QFormLayout::FieldRole, what);

	label_4 = new QLabel(tab);
	label_4->setObjectName(QString::fromUtf8("label_4"));

	formLayout->setWidget(5, QFormLayout::LabelRole, label_4);

	noAcl = new QCheckBox(tab);
	noAcl->setObjectName(QString::fromUtf8("noAcl"));

	formLayout->setWidget(11, QFormLayout::FieldRole, noAcl);

	verticalLayout->addLayout(formLayout);

	tabWidget->addTab(tab, QString());
	tab_2 = new QWidget();
	tab_2->setObjectName(QString::fromUtf8("tab_2"));
	verticalLayout_2 = new QVBoxLayout(tab_2);
	verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));

	stdOutput = createStdOutput(this);
	verticalLayout_2->addWidget(stdOutput);
	tabWidget->addTab(tab_2, QString());

	tabWidget->setCurrentIndex(0);

	QMetaObject::connectSlotsByName(this);

	auto format_model = new BackupFormatModel(this);
	backupFormat->setModel(format_model);

	retranslateUi();
}

BackupDialog::~BackupDialog()
{
}


void BackupDialog::retranslateUi()
{
	setWindowTitle(QApplication::translate("BackupDialog", "Dialog", nullptr));
	label->setText(QApplication::translate("BackupDialog", "Filename", nullptr));
	selectDestination->setText(QApplication::translate("BackupDialog", "...", nullptr));
	label_2->setText(QApplication::translate("BackupDialog", "Format", nullptr));
	label_3->setText(QApplication::translate("BackupDialog", "Jobs:", nullptr));
	chkbxVerbose->setText(QApplication::translate("BackupDialog", "Verbose (-v)", nullptr));
	label_5->setText(QApplication::translate("BackupDialog", "Compression (-Z)", nullptr));
#ifndef QT_NO_TOOLTIP
	compression->setToolTip(QApplication::translate("BackupDialog", "-1 means default, 0-9 is no compression to max compression", nullptr));
#endif // QT_NO_TOOLTIP
	label_4->setText(QApplication::translate("BackupDialog", "What", nullptr));
	what->setItemText(0, QApplication::translate("BackupDialog", "data + schema", nullptr));
	what->setItemText(1, QApplication::translate("BackupDialog", "data only (-a)", nullptr));
	what->setItemText(2, QApplication::translate("BackupDialog", "schema-only (-s)", nullptr));

	chkbxIncludeBlobs->setText(QApplication::translate("BackupDialog", "Include blobs (-b)", nullptr));
	chkbxClean->setText(QApplication::translate("BackupDialog", "Clean (-c)", nullptr));
	chkbxCreate->setText(QApplication::translate("BackupDialog", "Create (-C)", nullptr));
	noOwner->setText(QApplication::translate("BackupDialog", "No owner (-O)", nullptr));
	oids->setText(QApplication::translate("BackupDialog", "Oids (-o)", nullptr));
	noAcl->setText(QApplication::translate("BackupDialog", "No privileges/acl (-x)", nullptr));
	btnStart->setText(QApplication::translate("BackupDialog", "START", nullptr));
	tabWidget->setTabText(tabWidget->indexOf(tab), QApplication::translate("BackupDialog", "Tab 1", nullptr));
	stdOutput->setPlainText(QApplication::translate("BackupDialog", "Test text.", nullptr));
	tabWidget->setTabText(tabWidget->indexOf(tab_2), QApplication::translate("BackupDialog", "Tab 2", nullptr));
} // retranslateUi

void BackupDialog::setConfig(const ConnectionConfig &cfg)
{
	m_config = cfg;
}


void BackupDialog::ConnectTo(QProcess *process)
{
	disconnectCurrentProcess();
	m_process = process;
	if (process) {
		process->setProcessChannelMode(QProcess::MergedChannels);
		process->setReadChannel(QProcess::StandardOutput);

		connect(process,  SIGNAL(readyRead()), this, SLOT(on_process_readyRead()));
		connect(process,  SIGNAL(errorOccurred(QProcess::ProcessError)), this,
				SLOT(on_process_errorOccurred(QProcess::ProcessError)));
		connect(process,  SIGNAL(finished(int, QProcess::ExitStatus)), this,
				SLOT(on_process_finished(int, QProcess::ExitStatus)));
	}
}

void BackupDialog::disconnectCurrentProcess()
{
	if (m_process) {
		disconnect(m_process,  SIGNAL(readyRead()), this, SLOT(on_process_readyRead()));
		disconnect(m_process,  SIGNAL(errorOccurred(QProcess::ProcessError)), this,
				SLOT(on_process_errorOccurred(QProcess::ProcessError)));
		disconnect(m_process,  SIGNAL(finished(int, QProcess::ExitStatus)), this,
				SLOT(on_process_finished(int, QProcess::ExitStatus)));
		m_process = nullptr;
	}

}


void BackupDialog::writeOutput(const QString &s)
{
	stdOutput->appendPlainText(s);
	QScrollBar *bar = stdOutput->verticalScrollBar();
	bar->setValue(bar->maximum());
}

void BackupDialog::on_process_readyRead()
{
	QByteArray data = m_process->readAllStandardOutput();
	writeOutput(QString::fromUtf8(data));
}

void BackupDialog::on_process_errorOccurred(QProcess::ProcessError error)
{
	QString msg;
	switch (error) {
	case 0:
		msg = tr("Failed to start");
		break;
	case 1:
		msg = tr("Crashed");
		break;
	case 2:
		msg = tr("Timedout");
		break;
	case 3:
		msg = tr("Read error");
		break;
	case 4:
		msg = tr("Write error");
		break;
	case 5:
		msg = tr("Unknown error");
		break;
	default:
		msg = tr("Unexpected error");
	}


	auto res = QMessageBox::critical(this, "pglab", msg, QMessageBox::Close);
	if (res == QMessageBox::Yes) {
		QApplication::quit();
	}

}

void BackupDialog::on_process_finished(int exitCode, QProcess::ExitStatus )
{
	writeOutput(tr("Completed, with exitcode %1\n").arg(exitCode));
}

void BackupDialog::setParams(QStringList &args)
{
	QString short_args("-");
	if (chkbxVerbose->checkState() == Qt::Checked)
		short_args += "v";
	if (chkbxClean->checkState() == Qt::Checked)
		short_args += "c";
	if (chkbxCreate->checkState() == Qt::Checked)
		short_args += "C";
	if (chkbxIncludeBlobs->checkState() == Qt::Checked)
		short_args += "b";
	switch (what->currentIndex()) {
	case 1:
		short_args += "a";
		break;
	case 2:
		short_args += "s";
		break;
	}
	if (oids->checkState() == Qt::Checked)
		short_args += "o";
	if (noAcl->checkState() == Qt::Checked)
		short_args += "x";
	if (short_args.length() > 1) // larger then one because always includes '-'
		args << short_args;

	// Todo check path exists and name is valid?

	QFileInfo fi(QDir::fromNativeSeparators(editFilename->text()));
	QDir dir(fi.absolutePath());
	if (!dir.exists())
		dir.mkdir(fi.absolutePath());

	args << "-f" << editFilename->text(); // R"-(c:\temp\backup.sql)-";

	int format_index = backupFormat->currentIndex();
	auto format_model_base = backupFormat->model();
	auto *bfm = dynamic_cast<BackupFormatModel *>(format_model_base);
	if (bfm) {
		QVariant v = bfm->data(bfm->index(format_index, 1));
		QString format("-F");
		format += v.toString();
		args << format;
	}

	int j = jobs->value();
	if (j > 0)
		args << "-j" << QString::number(j);

	int comp = compression->value();
	if (comp >= 0)
		args << "-Z" << QString::number(comp);
}

void BackupDialog::on_btnStart_clicked()
{
	stdOutput->clear();

	//QString program = R"-(C:\Prog\bigsql\pg96\bin\pg_dump.exe)-";
	QString program = "C:/Prog/bigsql/pg11/bin/pg_dump.exe";
	QStringList arguments;
	setParams(arguments);

	// Database connection paramters are passed through the environment as this is far less visible to others. Commandline
	// parameters can often be viewed even if the user is not the owner of the process.
	// We use the systemEnvironment as a sane default. Then we let the connection overwrite all PG variables in it.
	QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
	m_config.writeToEnvironment(env);
	//env.insert("SESSIONNAME", "Console");
	auto p = new QProcess(this);
	ConnectTo(p);
	p->setProcessEnvironment(env);
#ifdef WIN32
//	p->setCreateProcessArgumentsModifier([] (QProcess::CreateProcessArguments *args)
//		{
//			args->flags |= CREATE_NEW_CONSOLE;
//			args->flags &= ~DETACHED_PROCESS;
//			args->startupInfo->dwFlags &= ~STARTF_USESTDHANDLES;
//		});
#endif
	p->start(program, arguments);
}

void BackupDialog::on_backupFormat_currentIndexChanged(int /*index*/)
{
	int format_index = backupFormat->currentIndex();
	auto format_model_base = backupFormat->model();
	auto *bfm = dynamic_cast<BackupFormatModel *>(format_model_base);
	if (bfm) {
		QVariant v = bfm->data(bfm->index(format_index, 1));
		QString format = v.toString();

		bool comp_enable = (format == "c" || format == "d");
		compression->setEnabled(comp_enable);
		if (!comp_enable)
			compression->setValue(-1);

		bool jobs_enable = (format == "d");
		jobs->setEnabled(jobs_enable);
		if (!jobs_enable)
			jobs->setValue(0);
	}
}

void BackupDialog::on_selectDestination_clicked()
{
	QString home_dir = QStandardPaths::locate(QStandardPaths::HomeLocation, "", QStandardPaths::LocateDirectory);
	QString fn = QFileDialog::getSaveFileName(this, tr("Save backup"), home_dir,
										tr("Backup file (*.backup)"));
	if (!fn.isEmpty()) {
		editFilename->setText(QDir::toNativeSeparators(fn));
	}
}