/**
 * @file MessageWindow.cpp
 * @brief MessageWindow Implementation.
 * @see MessageWindow.h
 * @author Micha? Policht
 */

#include <stdio.h>
#include "MessageWindow.h"
#include <QMessageBox>
#include <QCoreApplication>
#include <QMutexLocker>

const char* MessageWindow::WINDOW_TITLE = "Message Window";
MessageWindow* MessageWindow::MsgHandler = NULL;

MessageWindow::MessageWindow(QWidget* parent, Qt::WFlags flags) 
	: QDockWidget(parent, flags),
		msgTextEdit(this)
{
	setWindowTitle(tr(WINDOW_TITLE));
	msgTextEdit.setReadOnly(true);
	setWidget(&msgTextEdit);

	MessageWindow::MsgHandler = this;
}

//static
QString MessageWindow::QtMsgToQString(QtMsgType type, const char *msg)
{
	switch (type) {
		case QtDebugMsg:
			return QLatin1String("Debug: ")+QLatin1String(msg);
		case QtWarningMsg:
			return QLatin1String("Warning: ")+QLatin1String(msg);
		case QtCriticalMsg:
			return QLatin1String("Critical: ")+QLatin1String(msg);
		case QtFatalMsg:
			return QLatin1String("Fatal: ")+QLatin1String(msg);
		default:
			return QLatin1String("Unrecognized message type: ")+QLatin1String(msg);
	}
}

//static
void MessageWindow::AppendMsgWrapper(QtMsgType type, const char* msg)
{
	static QMutex mutex;
	QMutexLocker locker(&mutex);
	
	if (MessageWindow::MsgHandler != NULL)
		return MessageWindow::MsgHandler->postMsgEvent(type, msg);
	else
        fprintf(stderr, "%s", MessageWindow::QtMsgToQString(type, msg).toLatin1().data());
}

void MessageWindow::customEvent(QEvent* event)
{
	if (static_cast<MessageWindow::EventType>(event->type()) == MessageWindow::MessageEventType)
		msgTextEdit.append(dynamic_cast<MessageEvent* >(event)->msg);
}

void MessageWindow::postMsgEvent(QtMsgType type, const char* msg)
{
	QString qmsg = MessageWindow::QtMsgToQString(type, msg);
	switch (type) {
		case QtDebugMsg:
			break;
		case QtWarningMsg:
			qmsg.prepend(QLatin1String("<FONT color=\"#FF0000\">"));
			qmsg.append(QLatin1String("</FONT>"));
			break;
		case QtCriticalMsg:
			if (QMessageBox::critical(this, QLatin1String("Critical Error"), qmsg,
					QMessageBox::Ignore,
					QMessageBox::Abort,
					QMessageBox::NoButton) == QMessageBox::Abort)
				abort(); // core dump
			qmsg.prepend(QLatin1String("<B><FONT color=\"#FF0000\">"));
			qmsg.append(QLatin1String("</FONT></B>"));
			break;
		case QtFatalMsg:
			QMessageBox::critical(this, QLatin1String("Fatal Error"), qmsg, QMessageBox::Ok, QMessageBox::NoButton, QMessageBox::NoButton);
			abort(); // deliberately core dump
	}
	//it's impossible to change GUI directly from thread other than the main thread 
	//so post message encapsulated by MessageEvent to the main thread's event queue
	QCoreApplication::postEvent(this, new MessageEvent(qmsg));
}

MessageEvent::MessageEvent(QString & msg):
	QEvent(static_cast<QEvent::Type>(MessageWindow::MessageEventType))
{
	this->msg = msg;
}