#include "BackupDialog.h"
#include "ui_BackupDialog.h"

#include "BackupFormatModel.h"

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

BackupDialog::BackupDialog(QWidget *parent) :
	QDialog(parent),
	ui(new Ui::BackupDialog)
{
	ui->setupUi(this);

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

BackupDialog::~BackupDialog()
{
	delete ui;
}

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(QString s)
{
	ui->stdOutput->appendPlainText(s);
	QScrollBar *bar = ui->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 (ui->chkbxVerbose->checkState() == Qt::Checked)
		short_args += "v";
	if (ui->chkbxClean->checkState() == Qt::Checked)
		short_args += "c";
	if (ui->chkbxCreate->checkState() == Qt::Checked)
		short_args += "C";
	if (ui->chkbxIncludeBlobs->checkState() == Qt::Checked)
		short_args += "b";
	switch (ui->what->currentIndex()) {
	case 1:
		short_args += "a";
		break;
	case 2:
		short_args += "s";
		break;
	}
	if (ui->oids->checkState() == Qt::Checked)
		short_args += "o";
	if (ui->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(ui->editFilename->text()));
	QDir dir(fi.absolutePath());
	if (!dir.exists())
		dir.mkdir(fi.absolutePath());

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

	int format_index = ui->backupFormat->currentIndex();
	auto format_model_base = ui->backupFormat->model();
	BackupFormatModel *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 jobs = ui->jobs->value();
	if (jobs > 0)
		args << "-j" << QString::number(jobs);

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

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

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


//	BOOL res = AllocConsole();
//	if (!res) {
//		DWORD error = GetLastError();
//		QMessageBox::critical(this, "pglab", tr("AllocConsole failed %1").arg(error), QMessageBox::Close);
//	}
//	HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
//	DWORD written;
//	res = WriteConsoleOutputCharacter(out, L"Hello, world!\n", 14, {0, 0}, &written);

//	PROCESS_INFORMATION proc_info;
//	STARTUPINFO startup_info;
//	memset(&startup_info, 0, sizeof(startup_info));
//	startup_info.cb = sizeof(startup_info);
//	startup_info.lpReserved;
//	startup_info.lpDesktop;
//	startup_info.lpTitle;
//	startup_info.dwX;
//	startup_info.dwY;
//	startup_info.dwXSize;
//	startup_info.dwYSize;
//	startup_info.dwXCountChars;
//	startup_info.dwYCountChars;
//	startup_info.dwFillAttribute;
//	startup_info.dwFlags = STARTF_USESTDHANDLES;
//	startup_info.wShowWindow;
//	startup_info.cbReserved2;
//	startup_info.lpReserved2;
//	startup_info.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
//	startup_info.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
//	startup_info.hStdError = GetStdHandle(STD_ERROR_HANDLE);
//	res =  CreateProcess(
//		LR"_(C:\Prog\build-conoutputtest-Desktop_Qt_5_8_0_MSVC2015_32bit2-Debug\debug\conoutputtest.exe)_",
//		NULL, //  _Inout_opt_ LPTSTR                lpCommandLine,
//		NULL, // _In_opt_    LPSECURITY_ATTRIBUTES lpProcessAttributes,
//		NULL, // _In_opt_    LPSECURITY_ATTRIBUTES lpThreadAttributes,
//		TRUE,
//		0, // _In_        DWORD                 dwCreationFlags,
//		NULL, // _In_opt_    LPVOID                lpEnvironment,
//		NULL, // _In_opt_    LPCTSTR               lpCurrentDirectory,
//		&startup_info, // _In_        LPSTARTUPINFO         lpStartupInfo,
//		&proc_info // _Out_       LPPROCESS_INFORMATION lpProcessInformation
//	);


//	QString program = R"_(C:\prog\build-conoutputtest-Desktop_Qt_5_8_0_MSVC2015_32bit2-Debug\debug\conoutputtest.exe)_";
//	QStringList arguments;
//	arguments << "/C" << "DIR /S c:\\";

	// 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 = ui->backupFormat->currentIndex();
	auto format_model_base = ui->backupFormat->model();
	BackupFormatModel *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");
		ui->compression->setEnabled(comp_enable);
		if (!comp_enable)
			ui->compression->setValue(-1);

		bool jobs_enable = (format == "d");
		ui->jobs->setEnabled(jobs_enable);
		if (!jobs_enable)
			ui->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()) {
		ui->editFilename->setText(QDir::toNativeSeparators(fn));
	}
}