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	/*******************************************************************************
	* fred Copyright (c) 2011 by Gillen Daniel <gillen.dan@pinguin.lu> *
	* *
	* Forensic Registry EDitor (fred) is a cross-platform M$ registry hive editor *
	* with special feautures useful during forensic analysis. *
	* *
	* 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 3 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, see <http://www.gnu.org/licenses/>. *
	*******************************************************************************/

	#ifndef FRED_REPORT_TEMPLATE_DIR
	#define FRED_REPORT_TEMPLATE_DIR "/usr/share/fred/report_templates/"
	#endif

	#include <QFileDialog>
	#include <QMessageBox>
	#include <QStringList>
	#include <QDesktopWidget>
	#include <QDir>
	#include <QSplitter>

	#include "mainwindow.h"
	#include "ui_mainwindow.h"
	#include "dlgabout.h"
	#include "dlgkeydetails.h"
	#include "dlgreportviewer.h"

	#include "compileinfo.h"

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

	// Initialize private vars
	this->p_hive=new RegistryHive(this);
	this->is_hive_open=false;
	this->p_reg_node_tree_model=NULL;
	this->p_reg_key_table_model=NULL;

	// Check for ~/.fred config dir
	this->CheckUserConfigDir();

	// Set main window size
	int cur_screen=QApplication::desktop()->screenNumber(this);
	int window_width=
	QApplication::desktop()->availableGeometry(cur_screen).width()*0.5;
	int window_height=
	QApplication::desktop()->availableGeometry(cur_screen).height()*0.5;
	int window_x=
	(QApplication::desktop()->availableGeometry(cur_screen).width()/2)-
	(window_width/2);
	int window_y=
	(QApplication::desktop()->availableGeometry(cur_screen).height()/2)-
	(window_height/2);
	this->setGeometry(window_x,
	window_y,
	window_width,
	window_height);

	// Create widgets
	this->p_horizontal_splitter=new QSplitter();
	this->p_horizontal_splitter->setOrientation(Qt::Horizontal);

	this->p_node_tree=new RegistryNodeTree(this->p_horizontal_splitter);
	this->p_node_tree->setHeaderHidden(true);

	this->p_vertical_splitter=new QSplitter(this->p_horizontal_splitter);
	this->p_vertical_splitter->setOrientation(Qt::Vertical);

	this->p_key_table=new RegistryKeyTable(this->p_vertical_splitter);

	this->p_horizontal_splitter2=new QSplitter(this->p_vertical_splitter);
	this->p_horizontal_splitter2->setOrientation(Qt::Horizontal);

	this->p_hex_edit_widget=new QWidget(this->p_horizontal_splitter2);
	this->p_hex_edit_layout=new QVBoxLayout(this->p_hex_edit_widget);
	this->p_hex_edit_layout->setContentsMargins(0,0,0,0);
	this->p_hex_edit=new QHexEdit();
	this->p_hex_edit->setReadOnly(true);
	this->p_hex_edit_status_bar=new QLabel();

	this->p_data_interpreter=new DataInterpreter(this->p_horizontal_splitter2);

	// Make sure hex viewer font is monospaced.
	QFont mono_font("Monospace");
	mono_font.setStyleHint(QFont::TypeWriter);
	this->p_hex_edit->setFont(mono_font);

	// Lay out widgets
	this->p_hex_edit_layout->addWidget(this->p_hex_edit);
	this->p_hex_edit_layout->addWidget(this->p_hex_edit_status_bar);

	this->p_horizontal_splitter2->addWidget(this->p_hex_edit_widget);
	this->p_horizontal_splitter2->addWidget(this->p_data_interpreter);

	this->p_vertical_splitter->addWidget(this->p_key_table);
	this->p_vertical_splitter->addWidget(this->p_horizontal_splitter2);

	this->p_horizontal_splitter->addWidget(this->p_node_tree);
	this->p_horizontal_splitter->addWidget(this->p_vertical_splitter);

	// Set stretch factors
	QSizePolicy node_tree_policy=this->p_node_tree->sizePolicy();
	node_tree_policy.setHorizontalStretch(1);
	node_tree_policy.setVerticalStretch(100);
	this->p_node_tree->setSizePolicy(node_tree_policy);

	QSizePolicy vertical_splitter_policy=this->p_vertical_splitter->sizePolicy();
	vertical_splitter_policy.setHorizontalStretch(4);
	vertical_splitter_policy.setVerticalStretch(100);
	this->p_vertical_splitter->setSizePolicy(vertical_splitter_policy);

	QSizePolicy key_table_policy=this->p_key_table->sizePolicy();
	key_table_policy.setVerticalStretch(5);
	key_table_policy.setHorizontalStretch(100);
	this->p_key_table->setSizePolicy(key_table_policy);

	QSizePolicy hex_edit_widget_policy=this->p_hex_edit_widget->sizePolicy();
	hex_edit_widget_policy.setVerticalStretch(2);
	hex_edit_widget_policy.setHorizontalStretch(200);
	this->p_hex_edit_widget->setSizePolicy(hex_edit_widget_policy);

	QSizePolicy data_interpreter_policy=this->p_data_interpreter->sizePolicy();
	data_interpreter_policy.setVerticalStretch(2);
	data_interpreter_policy.setHorizontalStretch(0);
	this->p_data_interpreter->setSizePolicy(data_interpreter_policy);

	// Connect signals
	this->connect(this->p_node_tree,
	SIGNAL(clicked(QModelIndex)),
	this,
	SLOT(SlotNodeTreeClicked(QModelIndex)));
	this->connect(this->p_node_tree,
	SIGNAL(activated(QModelIndex)),
	this,
	SLOT(SlotNodeTreeClicked(QModelIndex)));
	this->connect(this->p_key_table,
	SIGNAL(clicked(QModelIndex)),
	this,
	SLOT(SlotKeyTableClicked(QModelIndex)));
	this->connect(this->p_key_table,
	SIGNAL(doubleClicked(QModelIndex)),
	this,
	SLOT(SlotKeyTableDoubleClicked(QModelIndex)));
	this->connect(this->p_hex_edit,
	SIGNAL(currentAddressChanged(int)),
	this,
	SLOT(SlotHexEditAddressChanged(int)));

	// Add central widget
	this->setContentsMargins(4,4,4,0);
	this->setCentralWidget(this->p_horizontal_splitter);

	// Set window title
	this->UpdateWindowTitle();

	// Set last open location to home dir
	this->last_open_location=QDir::homePath();

	// Load report templates and update menu
	this->p_data_reporter=new DataReporter();
	// Load reports from system wide include dir
	this->p_data_reporter->LoadReportTemplates(FRED_REPORT_TEMPLATE_DIR);
	// Load user's report templates
	this->p_data_reporter->LoadReportTemplates(QDir::homePath()
	.append(QDir::separator())
	.append(".fred")
	.append(QDir::separator())
	.append("report_templates"));
	this->UpdateDataReporterMenu();

	// Finally, parse command line arguments
	this->ParseCommandLineArgs();
	}

	MainWindow::~MainWindow() {
	if(this->is_hive_open) {
	this->p_hive->Close();
	}
	delete ui;
	}

	void MainWindow::on_action_Quit_triggered() {
	qApp->exit();
	}

	void MainWindow::on_action_Open_hive_triggered() {
	QString hive_file="";

	hive_file=QFileDialog::getOpenFileName(this,
	tr("Open registry hive"),
	this->last_open_location,
	tr("All files (*)"));
	if(hive_file=="") return;

	this->OpenHive(hive_file);
	}

	void MainWindow::on_action_Close_hive_triggered() {
	if(this->is_hive_open) {
	// Delete models
	if(this->p_reg_node_tree_model!=NULL) {
	this->p_node_tree->setModel(NULL);
	delete this->p_reg_node_tree_model;
	this->p_reg_node_tree_model=NULL;
	}
	if(this->p_reg_key_table_model!=NULL) {
	this->p_key_table->setModel(NULL);
	delete this->p_reg_key_table_model;
	this->p_reg_key_table_model=NULL;
	}

	// Remove any data from hex edit and data interpreter
	this->p_hex_edit->setData(QByteArray());
	this->p_hex_edit_status_bar->setText("");
	this->p_data_interpreter->ClearValues();

	// Close hive
	this->p_hive->Close();

	this->is_hive_open=false;
	this->ui->action_Close_hive->setEnabled(false);
	this->ui->MenuReports->setEnabled(false);
	this->UpdateWindowTitle();
	}
	}

	void MainWindow::on_actionAbout_Qt_triggered() {
	QMessageBox::aboutQt(this,tr("About Qt"));
	}

	void MainWindow::on_actionAbout_fred_triggered() {
	DlgAbout dlg_about(this);
	dlg_about.exec();
	}

	void MainWindow::SlotNodeTreeClicked(QModelIndex index) {
	QString node_path;

	if(!index.isValid()) return;

	//Built node path
	node_path.clear();
	node_path=this->p_reg_node_tree_model->data(index,Qt::DisplayRole)
	.toString().prepend("\\");
	while(this->p_reg_node_tree_model->parent(index)!=QModelIndex()) {
	// Prepend all parent nodes
	index=this->p_reg_node_tree_model->parent(index);
	node_path.prepend(this->p_reg_node_tree_model->data(index,Qt::DisplayRole)
	.toString().prepend("\\"));
	}

	// Create table model and attach it to the table view
	if(this->p_reg_key_table_model!=NULL) {
	this->p_key_table->setModel(NULL);
	delete this->p_reg_key_table_model;
	this->p_hex_edit->setData(QByteArray());
	this->p_hex_edit_status_bar->setText("");
	this->p_data_interpreter->ClearValues();
	}
	this->p_reg_key_table_model=new RegistryKeyTableModel(this->p_hive,node_path);
	this->p_key_table->setModel(this->p_reg_key_table_model);
	}

	void MainWindow::SlotKeyTableDoubleClicked(QModelIndex index) {
	Q_UNUSED(index);
	/*
	QModelIndex key_index;
	QModelIndex node_index;
	QStringList nodes;

	QString key_name;
	QString key_type;
	QByteArray key_value;

	if(!index.isValid()) return;

	// Get key name, type and value
	key_index=this->p_reg_key_table_model->index(index.row(),0);
	key_name=this->p_reg_key_table_model->data(key_index,Qt::DisplayRole)
	.toString();
	key_index=this->p_reg_key_table_model->index(index.row(),1);
	key_type=this->p_reg_key_table_model->data(key_index,Qt::DisplayRole)
	.toString();
	key_index=this->p_reg_key_table_model->index(index.row(),2);
	key_value=this->p_reg_key_table_model->data(key_index,
	RegistryKeyTableModel::
	AdditionalRoles_GetRawData)
	.toByteArray();

	// Get current node
	node_index=this->p_node_tree->currentIndex();

	//Built node path
	nodes.clear();
	nodes.append(this->p_reg_node_tree_model->
	data(node_index,Qt::DisplayRole).toString());
	while(this->p_reg_node_tree_model->parent(node_index)!=QModelIndex()) {
	// Prepend all parent nodes
	node_index=this->p_reg_node_tree_model->parent(node_index);
	nodes.prepend(this->p_reg_node_tree_model->
	data(node_index,Qt::DisplayRole).toString());
	}

	DlgKeyDetails dlg_key_details(this);
	dlg_key_details.SetValues(nodes,key_name,key_type,key_value);
	dlg_key_details.exec();
	*/
	}

	void MainWindow::SlotKeyTableClicked(QModelIndex index) {
	if(!index.isValid()) return;

	this->selected_key_value=
	this->p_reg_key_table_model->data(this->p_reg_key_table_model->
	index(index.row(),2),
	RegistryKeyTableModel::
	AdditionalRoles_GetRawData)
	.toByteArray();
	this->p_hex_edit->setData(this->selected_key_value);
	}

	void MainWindow::SlotHexEditAddressChanged(int hex_offset) {
	if(!this->is_hive_open \|\| this->selected_key_value.isEmpty()) return;

	// Update hex edit status bar
	this->p_hex_edit_status_bar->
	setText(QString().sprintf("Byte offset: 0x%04X (%u)",hex_offset,hex_offset));
	// Update data interpreter
	this->UpdateDataInterpreter(hex_offset);
	}

	void MainWindow::SlotReportClicked() {
	// Get report category and name from sender and it's parent
	QString category=((QMenu)((QAction)QObject::sender())->parent())->title();
	QString report=((QAction*)QObject::sender())->text();

	// Generate report
	QString report_content=this->p_data_reporter->GenerateReport(this->p_hive,
	category,
	report);

	// Show result in report viewer
	if(report_content!=QString()) {
	DlgReportViewer *p_dlg_report_view=new DlgReportViewer(report_content,this);
	p_dlg_report_view->exec();
	delete p_dlg_report_view;
	} else {
	// TODO: Something went wrong!
	}
	}

	void MainWindow::CheckUserConfigDir() {
	QString user_config_dir=QDir::homePath()
	.append(QDir::separator())
	.append(".fred");
	if(!QDir(user_config_dir).exists()) {
	// User config dir does not exists, try to create it
	if(!QDir().mkpath(user_config_dir)) {
	// TODO: Maybe warn user
	return;
	}
	user_config_dir.append(QDir::separator()).append("report_templates");
	if(!QDir().mkpath(user_config_dir)) {
	// TODO: Maybe warn user
	return;
	}
	}
	}

	void MainWindow::UpdateWindowTitle(QString filename) {
	if(filename=="") {
	this->setWindowTitle(QString().sprintf("%s v%s",APP_TITLE,APP_VERSION));
	} else {
	this->setWindowTitle(QString().sprintf("%s v%s - %s",
	APP_TITLE,
	APP_VERSION,
	filename.toLocal8Bit().constData()));
	}
	}

	void MainWindow::UpdateDataInterpreter(int hex_offset) {
	QDateTime date_time;
	const char *p_data;
	int remaining_data_len;

	// Remove all old values from data interpreter
	this->p_data_interpreter->ClearValues();

	// Calculate how many bytes are remainig after current offset
	remaining_data_len=this->selected_key_value.size()-hex_offset;
	if(!remaining_data_len>0) {
	// Nothing to show
	return;
	}

	// Get pointer to data at current offset
	p_data=this->selected_key_value.constData();
	p_data+=hex_offset;

	//#define rotl32(x,n) (((x) << n) \| ((x) >> (32 - n)))
	//#define rotr32(x,n) (((x) >> n) \| ((x) << (32 - n)))
	//#define rotl64(x,n) (((x) << n) \| ((x) >> (64 - n)))
	//#define rotr64(x,n) (((x) >> n) \| ((x) << (64 - n)))

	if(remaining_data_len>=1) {
	this->p_data_interpreter->AddValue("int8:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"int8",
	hex_offset));
	this->p_data_interpreter->AddValue("uint8:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"uint8",
	hex_offset));
	}
	if(remaining_data_len>=2) {
	this->p_data_interpreter->AddValue("int16:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"int16",
	hex_offset));
	this->p_data_interpreter->AddValue("uint16:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"uint16",
	hex_offset));
	}
	if(remaining_data_len>=4) {
	this->p_data_interpreter->AddValue("int32:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"int32",
	hex_offset));
	this->p_data_interpreter->AddValue("uint32:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"uint32",
	hex_offset));
	this->p_data_interpreter->AddValue("unixtime:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"unixtime",
	hex_offset));
	}
	if(remaining_data_len>=8) {
	this->p_data_interpreter->AddValue("int64:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"int64",
	hex_offset));
	this->p_data_interpreter->AddValue("uint64:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"uint64",
	hex_offset));
	this->p_data_interpreter->AddValue("filetime64:",
	RegistryHive::KeyValueToString(
	this->selected_key_value,
	"filetime",
	hex_offset));
	}

	//#undef rotl32
	//#undef rotl64
	}

	void MainWindow::UpdateDataReporterMenu() {
	int i=0,ii=0;
	QMenu *p_category_entry;
	QAction *p_report_entry;

	QStringList categories=this->p_data_reporter->GetAvailableReportCategories();
	QStringList reports;

	for(i=0;i<categories.count();i++) {
	// First create category submenu
	p_category_entry=this->ui->MenuReports->addMenu(categories.value(i));
	// Now add category reports
	reports=this->p_data_reporter->GetAvailableReports(categories.value(i));
	for(ii=0;ii<reports.count();ii++) {
	p_report_entry=new QAction(reports.value(ii),p_category_entry);
	p_category_entry->addAction(p_report_entry);
	this->connect(p_report_entry,
	SIGNAL(triggered()),
	this,
	SLOT(SlotReportClicked()));
	}
	}
	}

	void MainWindow::OpenHive(QString hive_file) {
	// Update last open location
	this->last_open_location=hive_file.left(hive_file.
	lastIndexOf(QDir::separator()));

	// If another hive is currently open, close it
	if(this->is_hive_open) this->on_action_Close_hive_triggered();

	// Try to open hive
	if(!this->p_hive->Open(hive_file)) {
	QMessageBox::critical(this,
	tr("Error opening hive file"),
	tr("Unable to open file '%1'").arg(hive_file));
	return;
	}

	// Create tree model
	this->p_reg_node_tree_model=
	new RegistryNodeTreeModel(this->p_hive);
	this->p_node_tree->setModel(this->p_reg_node_tree_model);

	this->is_hive_open=true;
	this->ui->action_Close_hive->setEnabled(true);
	this->ui->MenuReports->setEnabled(true);
	this->UpdateWindowTitle(hive_file);
	}

	void MainWindow::ParseCommandLineArgs() {
	QStringList args=qApp->arguments();

	// If exactly 1 argument was specified, it should be a hive to open
	if(args.count()==2) {
	this->OpenHive(args.at(1));
	}
	}

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