/*
   mainwindow.cc
   This file is part of the Project::OSiRiON world editor 
   and is distributed under the terms and conditions of 
   the GNU General Public License version 2
*/

#include "mainwindow.h"
#include "editorwindow.h"

#include "config.h"

#include <QMenuBar>
#include <QStatusBar>
#include <QFileDialog>

namespace editor
{

/**
 * @brief MainWindow is the application's main window.
 * The main window contains a QMdiArea that manages ZoneEditor children
 * */
MainWindow::MainWindow()
{
	// set window title
	setWindowTitle(tr("Project::OSiRiON world editor") + " " + PACKAGE_VERSION);
	
	// initialize MDI (multiple document interface) area
	mainwindow_mdiarea = new QMdiArea();
	mainwindow_mdiarea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	mainwindow_mdiarea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	setCentralWidget(mainwindow_mdiarea);
	
	connect(mainwindow_mdiarea, SIGNAL(subWindowActivated(QMdiSubWindow*)), this, SLOT(updateMenus()));

	// initialize actions
	initActions();
	
	// initialize menu bar
	initMenus();
	updateMenus();
	
	// initialize status bar
	initStatus();

}

void MainWindow::initActions()
{
	// File -> New
	action_new = new QAction( tr("&New..."), this);
	action_new->setStatusTip(tr("Create a new zone"));
	action_new->setShortcuts(QKeySequence::New);
	connect(action_new, SIGNAL(triggered()), this, SLOT(slot_new()));
	
	// File -> Open
	action_open = new QAction( tr("&Open..."), this);
	action_open->setShortcuts(QKeySequence::Open);
	action_open->setStatusTip(tr("Open an existing zone .ini file"));
	connect(action_open, SIGNAL(triggered()), this, SLOT(slot_open()));
	
	action_save  = new QAction( tr("&Save"), this);
	action_save->setStatusTip(tr("Save zone to current .ini file"));
	action_save->setShortcuts(QKeySequence::Save);
	connect(action_save, SIGNAL(triggered()), this, SLOT(slot_save()));
	
	action_save_as  = new QAction( tr("Save &As..."), this);
	action_save_as->setStatusTip(tr("Save zone to a new .ini file"));
	action_save_as->setShortcuts(QKeySequence::SaveAs);
	connect(action_save_as, SIGNAL(triggered()), this, SLOT(slot_save_as()));
	
	// File -> Quit
	action_quit = new QAction(tr("&Quit"), this);
	action_quit->setShortcuts(QKeySequence::Quit);
	action_quit->setStatusTip(tr("Exit the application"));
	connect(action_quit, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()));
	
	// Edit -> Add
	action_add = new QAction(tr("&Add"), this);
	action_add->setStatusTip(tr("Add a new entity"));
	connect(action_add, SIGNAL(triggered()), this, SLOT(slot_add()));
	
	action_delete = new QAction(tr("&Delete"), this);
	action_delete->setStatusTip(tr("Delete selected entities"));
	action_delete->setShortcuts(QKeySequence::Delete);
	connect(action_delete, SIGNAL(triggered()), this, SLOT(slot_delete()));
	
	action_duplicate = new QAction(tr("D&uplicate"), this);
	action_duplicate->setStatusTip(tr("Duplicate selected entities"));
	action_duplicate->setShortcut(QKeySequence(Qt::Key_Space));
	connect(action_duplicate, SIGNAL(triggered()), this, SLOT(slot_duplicate()));	
}

void MainWindow::initMenus()
{
	mainwindow_filemenu = menuBar()->addMenu(tr("&File"));
	mainwindow_filemenu->addAction(action_new);
	mainwindow_filemenu->addAction(action_open);
	mainwindow_filemenu->addAction(action_save);
	mainwindow_filemenu->addAction(action_save_as);
	mainwindow_filemenu->addSeparator();
	mainwindow_filemenu->addAction(action_quit);

	mainwindow_editmenu = menuBar()->addMenu(tr("&Edit"));
	mainwindow_editmenu->addAction(action_add);
	mainwindow_editmenu->addAction(action_delete);
	mainwindow_editmenu->addAction(action_duplicate);
}

void MainWindow::initStatus()
{
	setStatusBar(new QStatusBar(this));
	statusBar()->showMessage(tr("Project::OSiRiON world editor") + " " + PACKAGE_VERSION);
}

void MainWindow::updateMenus()
{
	bool active =(mainwindow_mdiarea->activeSubWindow() != 0);
	
	action_save_as->setEnabled(active);
	action_save->setEnabled(active);
	
	action_add->setEnabled(active);
	action_delete->setEnabled(active);
	action_duplicate->setEnabled(active);
}

EditorWindow *MainWindow::active_child()
{
	if (QMdiSubWindow *active_subwindow = mainwindow_mdiarea->activeSubWindow())
		return qobject_cast<EditorWindow *>(active_subwindow->widget());
	return 0;
}

QMdiSubWindow *MainWindow::find_child(const QString &filename)
{

	QString canonical = QFileInfo(filename).canonicalFilePath();

	foreach (QMdiSubWindow *subwindow, mainwindow_mdiarea->subWindowList()) {
		EditorWindow *editorwindow = qobject_cast<EditorWindow *>(subwindow->widget());
		
		if (canonical == QFileInfo(editorwindow->filename()).canonicalFilePath())
			return subwindow;
	}
	return 0;

}

EditorWindow *MainWindow::add_child()
{
	// create a child widget
	EditorWindow *child_widget = new EditorWindow();
	
	// add the widget to the MDI area,
	// this will wrap an QMdiSubWindow around it
	QMdiSubWindow *subwindow = mainwindow_mdiarea->addSubWindow(child_widget);
	//subwindow->resize(768, 512);
	
	child_widget->show();
	
	return child_widget;
}

void MainWindow::slot_new()
{
	add_child();
}

void MainWindow::slot_open()
{
	QString filename = QFileDialog::getOpenFileName(this, tr("Open..."));
     
	if (!filename.isEmpty()) {
		QMdiSubWindow *subwindow = find_child(filename);
		
		if (subwindow) {
			mainwindow_mdiarea->setActiveSubWindow(subwindow);
		} else {
			EditorWindow *editorwindow = add_child();
						
			if (!editorwindow->loadFile(filename)) {
				subwindow = find_child(filename);
				subwindow->close();
			} else {			
				subwindow = find_child(filename);
				if (subwindow) {
					subwindow->setWindowTitle(filename);
				}
			}
		}
	}
}

void MainWindow::slot_save_as()
{
	EditorWindow *editorwindow = active_child();
	if (editorwindow) {
		QString filename = QFileDialog::getSaveFileName(this, tr("Save as..."));
		
		if (!filename.isEmpty()) {
			if (!editorwindow->saveFile(filename))
				return;
			
			QMdiSubWindow *subwindow = find_child(filename);
			if (subwindow) {
				subwindow->setWindowTitle(filename);
			}
		}
	}
}

void MainWindow::slot_save()
{
	if (active_child()) {
		if (active_child()->filename().isEmpty()) {
			slot_save_as();
			return;
		} else {
			active_child()->saveFile(active_child()->filename());
		}
	}
}

void MainWindow::slot_add()
{
	if (active_child()) {
		active_child()->addEntity();
	}
}

void MainWindow::slot_delete()
{
	if (active_child()) {
		active_child()->deleteSelected();
	}
}

void MainWindow::slot_duplicate()
{
	if (active_child()) {
		active_child()->duplicateSelected();
	}
}

}