/*
 *  pickfileradio.cpp  -  radio button with an associated file picker
 *  Program:  kalarm
 *  Copyright (C) 2005 by David Jarvie <software@astrojar.org.uk>
 *
 *  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 2 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, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "kalarm.h"

#include <qbuttongroup.h>
#include <qpushbutton.h>
#include <qtimer.h>

#include <kdebug.h>

#include "lineedit.h"
#include "pickfileradio.moc"


PickFileRadio::PickFileRadio(QPushButton* button, LineEdit* edit, const QString& text, QButtonGroup* parent, const char* name)
	: RadioButton(text, parent, name),
	  mGroup(parent),
	  mEdit(edit),
	  mButton(button),
	  mLastId(-1),     // set to an invalid value
	  mRevertId(false)
{
	Q_ASSERT(parent);
	Q_ASSERT(button);
	mButton->setEnabled(false);
	connect(mButton, SIGNAL(clicked()), SLOT(slotPickFile()));
	if (mEdit)
		mEdit->setEnabled(false);
	connect(mGroup, SIGNAL(buttonSet(int)), SLOT(slotSelectionChanged(int)));
}

PickFileRadio::PickFileRadio(const QString& text, QButtonGroup* parent, const char* name)
	: RadioButton(text, parent, name),
	  mGroup(parent),
	  mEdit(0),
	  mButton(0),
	  mLastId(-1),     // set to an invalid value
	  mRevertId(false)
{
	Q_ASSERT(parent);
}

void PickFileRadio::init(QPushButton* button, LineEdit* edit)
{
	Q_ASSERT(button);
	mEdit   = edit;
	mButton = button;
	mButton->setEnabled(false);
	connect(mButton, SIGNAL(clicked()), SLOT(slotPickFile()));
	if (mEdit)
		mEdit->setEnabled(false);
	connect(mGroup, SIGNAL(buttonSet(int)), SLOT(slotSelectionChanged(int)));
	setReadOnly(RadioButton::isReadOnly());
}

void PickFileRadio::setReadOnly(bool ro)
{
	RadioButton::setReadOnly(ro);
	if (mButton)
	{
		if (mEdit)
			mEdit->setReadOnly(ro);
		if (ro)
			mButton->hide();
		else
			mButton->show();
	}
}

void PickFileRadio::setFile(const QString& file)
{
	mFile = file;
}

QString PickFileRadio::file() const
{
	return mEdit ? mEdit->text() : mFile;
}

/******************************************************************************
* Set the radio button enabled or disabled.
* Adjusts the enabled/disabled state of other controls appropriately.
*/
void PickFileRadio::setEnabled(bool enable)
{
	Q_ASSERT(mButton);
	RadioButton::setEnabled(enable);
	enable = enable  &&  mGroup->selected() == this;
	if (enable)
	{
		if (!pickFileIfNone())
			enable = false;    // revert to previously selected type
	}
	mButton->setEnabled(enable);
	if (mEdit)
		mEdit->setEnabled(enable);
}

/******************************************************************************
* Called when the selected radio button changes.
*/
void PickFileRadio::slotSelectionChanged(int id)
{
	if (id == mLastId  ||  mRevertId)
		return;
	int radioId = mGroup->id(this);
	if (mLastId == radioId)
	{
		mButton->setEnabled(false);
		if (mEdit)
			mEdit->setEnabled(false);
	}
	else if (id == radioId)
	{
		if (!pickFileIfNone())
			return;    // revert to previously selected type
		mButton->setEnabled(true);
		if (mEdit)
			mEdit->setEnabled(true);
	}
	mLastId = id;
}

/******************************************************************************
* Prompt for a file name if there is none currently entered.
*/
bool PickFileRadio::pickFileIfNone()
{
	if (mEdit)
		mFile = mEdit->text();
	if (!mFile.isEmpty())
		return true;
	slotPickFile();
	return !mFile.isEmpty();
}

/******************************************************************************
* Called when the file picker button is clicked.
*/
void PickFileRadio::slotPickFile()
{
	mFile = pickFile();
	if (mEdit)
		mEdit->setText(mFile);
	if (mFile.isEmpty())
	{
		// No file is selected, so revert to the previous radio button selection.
		// But wait a moment before setting the radio button, or it won't work.
		mRevertId = true;   // prevent picker dialogue popping up twice
		QTimer::singleShot(0, this, SLOT(setLastId()));
	}
}

/******************************************************************************
* Select the previously selected radio button in the group.
*/
void PickFileRadio::setLastId()
{
	if (mLastId == -1)
		setOn(false);    // we don't know the previous selection, so just turn this button off
	else
		mGroup->setButton(mLastId);
	mRevertId = false;
}