/*
 *  specialactions.cpp  -  widget to specify special alarm actions
 *  Program:  kalarm
 *  Copyright © 2004-2009,2012 by David Jarvie <djarvie@kde.org>
 *
 *  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 "specialactions.h"

#include "autoqpointer.h"
#include "checkbox.h"
#include "functions.h"
#include "shellprocess.h"

#include <KLocalizedString>

#include <QLabel>
#include <QGroupBox>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QResizeEvent>
#include <QDialogButtonBox>
#include <QPushButton>
#include <QLineEdit>
#include "kalarm_debug.h"


/*=============================================================================
= Class SpecialActionsButton
= Button to display the Special Alarm Actions dialog.
=============================================================================*/

SpecialActionsButton::SpecialActionsButton(bool enableCheckboxes, QWidget* parent)
    : QPushButton(i18nc("@action:button", "Special Actions..."), parent),
      mOptions(0),
      mEnableCheckboxes(enableCheckboxes),
      mReadOnly(false)
{
    setCheckable(true);
    setChecked(false);
    connect(this, &SpecialActionsButton::clicked, this, &SpecialActionsButton::slotButtonPressed);
    setWhatsThis(i18nc("@info:whatsthis", "Specify actions to execute before and after the alarm is displayed."));
}

/******************************************************************************
* Set the pre- and post-alarm actions.
* The button's pressed state is set to reflect whether any actions are set.
*/
void SpecialActionsButton::setActions(const QString& pre, const QString& post, KAEvent::ExtraActionOptions options)
{
    mPreAction  = pre;
    mPostAction = post;
    mOptions    = options;
    setChecked(!mPreAction.isEmpty() || !mPostAction.isEmpty());
}

/******************************************************************************
* Called when the OK button is clicked.
* Display a font and colour selection dialog and get the selections.
*/
void SpecialActionsButton::slotButtonPressed()
{
    // Use AutoQPointer to guard against crash on application exit while
    // the dialogue is still open. It prevents double deletion (both on
    // deletion of SpecialActionsButton, and on return from this function).
    AutoQPointer<SpecialActionsDlg> dlg = new SpecialActionsDlg(mPreAction, mPostAction, mOptions, mEnableCheckboxes, this);
    dlg->setReadOnly(mReadOnly);
    if (dlg->exec() == QDialog::Accepted)
    {
        mPreAction  = dlg->preAction();
        mPostAction = dlg->postAction();
        mOptions    = dlg->options();
        Q_EMIT selected();
    }
        if (dlg)
            setChecked(!mPreAction.isEmpty() || !mPostAction.isEmpty());
}


/*=============================================================================
= Class SpecialActionsDlg
= Pre- and post-alarm actions dialog.
=============================================================================*/

static const char SPEC_ACT_DIALOG_NAME[] = "SpecialActionsDialog";


SpecialActionsDlg::SpecialActionsDlg(const QString& preAction, const QString& postAction,
                                     KAEvent::ExtraActionOptions options, bool enableCheckboxes,
                                     QWidget* parent)
    : QDialog(parent)
{
    setWindowTitle(i18nc("@title:window", "Special Alarm Actions"));
    QVBoxLayout* mainLayout = new QVBoxLayout;
    setLayout(mainLayout);

    QWidget* page = new QWidget(this);
    mainLayout->addWidget(page);
    QVBoxLayout* layout = new QVBoxLayout(page);
    layout->setMargin(0);

    mActions = new SpecialActions(enableCheckboxes, page);
    layout->addWidget(mActions);
    mActions->setActions(preAction, postAction, options);

    QDialogButtonBox* buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok|QDialogButtonBox::Cancel);
    mainLayout->addWidget(buttonBox);
    QPushButton* okButton = buttonBox->button(QDialogButtonBox::Ok);
    okButton->setDefault(true);
    okButton->setShortcut(Qt::CTRL | Qt::Key_Return);
    connect(buttonBox, &QDialogButtonBox::rejected, this, &SpecialActionsDlg::reject);
    connect(okButton, &QPushButton::clicked, this, &SpecialActionsDlg::slotOk);

    QSize s;
    if (KAlarm::readConfigWindowSize(SPEC_ACT_DIALOG_NAME, s))
        resize(s);
}

/******************************************************************************
* Called when the OK button is clicked.
*/
void SpecialActionsDlg::slotOk()
{
    if (mActions->isReadOnly())
        reject();
    accept();
}

/******************************************************************************
* Called when the dialog's size has changed.
* Records the new size in the config file.
*/
void SpecialActionsDlg::resizeEvent(QResizeEvent* re)
{
    if (isVisible())
        KAlarm::writeConfigWindowSize(SPEC_ACT_DIALOG_NAME, re->size());
    QDialog::resizeEvent(re);
}


/*=============================================================================
= Class SpecialActions
= Pre- and post-alarm actions widget.
=============================================================================*/

SpecialActions::SpecialActions(bool enableCheckboxes, QWidget* parent)
    : QWidget(parent),
      mEnableCheckboxes(enableCheckboxes),
      mReadOnly(false)
{
    QVBoxLayout* topLayout = new QVBoxLayout(this);
    topLayout->setMargin(0);

    // Pre-alarm action
    QGroupBox* group = new QGroupBox(i18nc("@title:group", "Pre-Alarm Action"), this);
    topLayout->addWidget(group);
    QVBoxLayout* vlayout = new QVBoxLayout(group);

    QWidget* box = new QWidget(group);   // this is to control the QWhatsThis text display area
    vlayout->addWidget(box);
    QHBoxLayout* boxLayout = new QHBoxLayout(box);
    boxLayout->setMargin(0);
    QLabel* label = new QLabel(i18nc("@label:textbox", "Command:"), box);
    boxLayout->addWidget(label);
    mPreAction = new QLineEdit(box);
    boxLayout->addWidget(mPreAction);
    label->setBuddy(mPreAction);
    connect(mPreAction, &QLineEdit::textChanged, this, &SpecialActions::slotPreActionChanged);
    box->setWhatsThis(xi18nc("@info:whatsthis",
                            "<para>Enter a shell command to execute before the alarm is displayed.</para>"
                            "<para>Note that it is executed only when the alarm proper is displayed, not when a reminder or deferred alarm is displayed.</para>"
                            "<para><note>KAlarm will wait for the command to complete before displaying the alarm.</note></para>"));
    boxLayout->setStretchFactor(mPreAction, 1);

    // Cancel if error in pre-alarm action
    mExecOnDeferral = new CheckBox(i18nc("@option:check", "Execute for deferred alarms"), group);
    mExecOnDeferral->setWhatsThis(xi18nc("@info:whatsthis", "<para>If unchecked, the command is only executed before the alarm proper is displayed.</para>"
                                                           "<para>If checked, the pre-alarm command is also executed before a deferred alarm is displayed.</para>"));
    vlayout->addWidget(mExecOnDeferral, 0, Qt::AlignLeft);

    mCancelOnError = new CheckBox(i18nc("@option:check", "Cancel alarm on error"), group);
    mCancelOnError->setWhatsThis(i18nc("@info:whatsthis", "Cancel the alarm if the pre-alarm command fails, i.e. do not display the alarm or execute any post-alarm action command."));
    vlayout->addWidget(mCancelOnError, 0, Qt::AlignLeft);

    mDontShowError = new CheckBox(i18nc("@option:check", "Do not notify errors"), group);
    mDontShowError->setWhatsThis(i18nc("@info:whatsthis", "Do not show error status or error message if the pre-alarm command fails."));
    vlayout->addWidget(mDontShowError, 0, Qt::AlignLeft);

    // Post-alarm action
    group = new QGroupBox(i18nc("@title:group", "Post-Alarm Action"), this);
    topLayout->addWidget(group);
    vlayout = new QVBoxLayout(group);

    box = new QWidget(group);   // this is to control the QWhatsThis text display area
    vlayout->addWidget(box);
    boxLayout = new QHBoxLayout(box);
    boxLayout->setMargin(0);
    label = new QLabel(i18nc("@label:textbox", "Command:"), box);
    boxLayout->addWidget(label);
    mPostAction = new QLineEdit(box);
    boxLayout->addWidget(mPostAction);
    label->setBuddy(mPostAction);
    box->setWhatsThis(xi18nc("@info:whatsthis",
                            "<para>Enter a shell command to execute after the alarm window is closed.</para>"
                            "<para>Note that it is not executed after closing a reminder window. If you defer "
                            "the alarm, it is not executed until the alarm is finally acknowledged or closed.</para>"));
    boxLayout->setStretchFactor(mPostAction, 1);

    mExecOnDeferral->setEnabled(enableCheckboxes);
    mCancelOnError->setEnabled(enableCheckboxes);
    mDontShowError->setEnabled(enableCheckboxes);
}

void SpecialActions::setActions(const QString& pre, const QString& post, KAEvent::ExtraActionOptions options)
{
    mPreAction->setText(pre);
    mPostAction->setText(post);
    mExecOnDeferral->setChecked(options & KAEvent::ExecPreActOnDeferral);
    mCancelOnError->setChecked(options & KAEvent::CancelOnPreActError);
    mDontShowError->setChecked(options & KAEvent::DontShowPreActError);
}

QString SpecialActions::preAction() const
{
    return mPreAction->text();
}

QString SpecialActions::postAction() const
{
    return mPostAction->text();
}

KAEvent::ExtraActionOptions SpecialActions::options() const
{
    KAEvent::ExtraActionOptions opts = 0;
    if (mExecOnDeferral->isChecked())  opts |= KAEvent::ExecPreActOnDeferral;
    if (mCancelOnError->isChecked())   opts |= KAEvent::CancelOnPreActError;
    if (mDontShowError->isChecked())   opts |= KAEvent::DontShowPreActError;
    return opts;
}

void SpecialActions::setReadOnly(bool ro)
{
    mReadOnly = ro;
    mPreAction->setReadOnly(mReadOnly);
    mPostAction->setReadOnly(mReadOnly);
    mExecOnDeferral->setReadOnly(mReadOnly);
    mCancelOnError->setReadOnly(mReadOnly);
    mDontShowError->setReadOnly(mReadOnly);
}

void SpecialActions::slotPreActionChanged(const QString& text)
{
    if (!mEnableCheckboxes)
    {
        bool textValid = !text.isEmpty();
        mExecOnDeferral->setEnabled(textValid);
        mCancelOnError->setEnabled(textValid);
        mDontShowError->setEnabled(textValid);
    }
}



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