/*
    SPDX-FileCopyrightText: 2006-2010 Tony Bloomfield <tonybloom@users.sourceforge.net>
    SPDX-FileCopyrightText: 2017 Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>
    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "kguiutils.h"

// ----------------------------------------------------------------------------
// QT Includes
// No need for QDateEdit, QSpinBox, etc., since these always return values

#include <QCheckBox>
#include <QPushButton>
#include <QWidget>
#include <QSpinBox>
#include <QApplication>
#include <QListWidget>
#include <QList>

// ----------------------------------------------------------------------------
// KDE Includes

#include <KComboBox>
#include <KLineEdit>
#include <KUrlRequester>

// ----------------------------------------------------------------------------
// Project Includes

#include "amountedit.h"
#include "kmymoneysettings.h"
#include "onlinetasks/interfaces/ui/ionlinejobedit.h"
#include "kmymoneytextedit.h"
#include "kmymoneypayeecombo.h"

/**************************************************************************
 *                                                                        *
 * The MandatoryFieldGroup code is courtesy of                            *
 * Mark Summerfield in Qt Quarterly                                       *
 * https://doc.qt.io/archives/qq/qq11-mandatoryfields.html                *
 *                                                                        *
 * Enhanced by Thomas Baumgart to support the lineedit field of a         *
 * a KComboBox.                                                           *
 *                                                                        *
 * With further widgets added by Allan Anderson for missing fields.       *
 **************************************************************************/

class KMandatoryFieldGroupPrivate
{
    Q_DISABLE_COPY(KMandatoryFieldGroupPrivate)

public:
    KMandatoryFieldGroupPrivate()
        : m_okButton(0)
        , m_enabled(true)
        , m_externalMandatoryState(true)
    {
    }

    QList<QWidget *>      m_widgets;
    QPushButton*          m_okButton;
    bool                  m_enabled;
    bool                  m_externalMandatoryState;
};

KMandatoryFieldGroup::KMandatoryFieldGroup(QObject *parent) :
    QObject(parent),
    d_ptr(new KMandatoryFieldGroupPrivate)
{
}

KMandatoryFieldGroup::~KMandatoryFieldGroup()
{
    Q_D(KMandatoryFieldGroup);
    delete d;
}

void KMandatoryFieldGroup::add(QWidget *widget)
{
    Q_D(KMandatoryFieldGroup);
    if (!d->m_widgets.contains(widget)) {
        if (qobject_cast<QCheckBox*>(widget))
            connect(qobject_cast<QCheckBox*>(widget),
                    &QCheckBox::clicked,
                    this, &KMandatoryFieldGroup::changed);

        else if (qobject_cast<KComboBox*>(widget)) {
            KComboBox* combo = qobject_cast<KComboBox*>(widget);
            KLineEdit* lineedit = qobject_cast<KLineEdit*>(combo->lineEdit());
            if (lineedit) {
                connect(lineedit, &QLineEdit::textChanged, this, &KMandatoryFieldGroup::changed);
            } else {
                connect(combo, static_cast<void (QComboBox::*)(int)>(&QComboBox::highlighted), this, &KMandatoryFieldGroup::changed);
            }
        }

        else if (qobject_cast<QLineEdit*>(widget)) {
            connect(qobject_cast<QLineEdit*>(widget),
                    &QLineEdit::textChanged,
                    this, &KMandatoryFieldGroup::changed);
        }

        else if (qobject_cast<QSpinBox*>(widget))
            connect(qobject_cast<QSpinBox*>(widget),
                    static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
                    this, &KMandatoryFieldGroup::changed);

        else if (qobject_cast<QListWidget*>(widget))
            connect(qobject_cast<QListWidget*>(widget),
                    &QListWidget::itemSelectionChanged,
                    this, &KMandatoryFieldGroup::changed);

        else if (qobject_cast<KUrlRequester*>(widget))
            connect(qobject_cast<KUrlRequester*>(widget),
                    &KUrlRequester::textChanged,
                    this, &KMandatoryFieldGroup::changed);

        else if (qobject_cast<KMyMoneyTextEdit*>(widget))
            connect(qobject_cast<KMyMoneyTextEdit*>(widget),
                    &KMyMoneyTextEdit::textChanged,
                    this, &KMandatoryFieldGroup::changed);

        else if (qobject_cast<IonlineJobEdit*>(widget)) {
            connect(qobject_cast<IonlineJobEdit*>(widget),
                    &IonlineJobEdit::validityChanged,
                    this, &KMandatoryFieldGroup::changed);

            // Do not set palette for IonlineJobEdits as they contain subwidgets
            d->m_widgets.append(widget);
            changed();
            return;
        }

        else {
            qWarning("MandatoryFieldGroup: unsupported class %s", (widget->metaObject()->className()));
            return;
        }

        QPalette palette = widget->palette();
        palette.setColor(QPalette::Base, KMyMoneySettings::schemeColor(SchemeColor::FieldRequired));
        widget->setPalette(palette);
        d->m_widgets.append(widget);
        changed();
    }
}

void KMandatoryFieldGroup::removeAll()
{
    Q_D(KMandatoryFieldGroup);
    while(!d->m_widgets.isEmpty()) {
        remove(d->m_widgets.at(0));
    }
}

void KMandatoryFieldGroup::remove(QWidget *widget)
{
    Q_D(KMandatoryFieldGroup);
    widget->setPalette(QApplication::palette());
    d->m_widgets.removeOne(widget);
    changed();
}

void KMandatoryFieldGroup::setOkButton(QPushButton *button)
{
    Q_D(KMandatoryFieldGroup);
    if (d->m_okButton && d->m_okButton != button)
        d->m_okButton->setEnabled(true);
    d->m_okButton = button;
    changed();
}

void KMandatoryFieldGroup::setExternalMandatoryState(bool state)
{
    Q_D(KMandatoryFieldGroup);
    if (d->m_externalMandatoryState != state) {
        d->m_externalMandatoryState = state;
        changed();
    }
}

void KMandatoryFieldGroup::changed()
{
    Q_D(KMandatoryFieldGroup);
    bool enable = d->m_externalMandatoryState;
    QList<QWidget*>::const_iterator i;
    for (i = d->m_widgets.cbegin(); i != d->m_widgets.cend(); ++i) {
        QWidget *widget = *i;
        // disabled widgets don't count
        if (!(widget->isEnabled())) {
            continue;
        }
        if (qobject_cast<KMyMoneyPayeeCombo*>(widget)) {
            if ((dynamic_cast<KMyMoneyPayeeCombo*>(widget))->lineEdit()->text().isEmpty()) {
                enable = false;
                break;
            } else
                continue;
        }
        if (qobject_cast<QCheckBox*>(widget)) {
            if ((qobject_cast<QCheckBox*>(widget))->checkState() == Qt::PartiallyChecked) {
                enable = false;
                break;
            } else
                continue;
        }
        if (qobject_cast<KComboBox*>(widget)) {
            if ((qobject_cast<KComboBox*>(widget))->currentText().isEmpty()) {
                enable = false;
                break;
            } else
                continue;
        }
        if (qobject_cast<QLineEdit*>(widget)) {
            if ((qobject_cast<QLineEdit*>(widget))->text().isEmpty()) {
                enable = false;
                break;
            } else
                continue;
        }
        if ((qobject_cast<QListWidget*>(widget))) {
            if ((qobject_cast<QListWidget*>(widget))->selectedItems().count() == 0) {
                enable = false;
                break;
            } else
                continue;
        }
        if ((qobject_cast<KUrlRequester*>(widget))) {
            if ((qobject_cast<KUrlRequester*>(widget))->text().isEmpty()) {
                enable = false;
                break;
            } else
                continue;
        }
        if ((qobject_cast<AmountEdit*>(widget))) {
            if (!(qobject_cast<AmountEdit*>(widget))->value().isZero()) {
                enable = false;
                break;
            } else
                continue;
        }
        if (qobject_cast<KMyMoneyTextEdit*>(widget)) {
            if (!(qobject_cast<KMyMoneyTextEdit*>(widget))->isValid()) {
                enable = false;
                break;
            } else {
                continue;
            }
        }
        if (qobject_cast<IonlineJobEdit*>(widget)) {
            if (!(qobject_cast<IonlineJobEdit*>(widget))->isValid()) {
                enable = false;
                break;
            } else {
                continue;
            }
        }
    }

    if (d->m_okButton)
        d->m_okButton->setEnabled(enable);
    d->m_enabled = enable;

    Q_EMIT stateChanged();
    Q_EMIT stateChanged(enable);
}

bool KMandatoryFieldGroup::isEnabled() const
{
    Q_D(const KMandatoryFieldGroup);
    return d->m_enabled;
}

void KMandatoryFieldGroup::clear()
{
    Q_D(KMandatoryFieldGroup);
    QList<QWidget *>::Iterator i;
    for (i = d->m_widgets.begin(); i != d->m_widgets.end(); ++i)
        (*i)->setPalette(QApplication::palette());
    d->m_widgets.clear();
    if (d->m_okButton) {
        d->m_okButton->setEnabled(true);
        d->m_okButton = 0;
        d->m_enabled = true;
    }
}
