/*
  Copyright (c) 2013-2017 Montel Laurent <montel@kde.org>

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License, version 2, as
  published by the Free Software Foundation.

  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 "statusrulewidgethandler.h"
#include "search/searchrule/searchrulestatus.h"
#include <PimCommon/MinimumComboBox>

#include <KIconLoader>

#include <QStackedWidget>

using namespace MailCommon;

static const struct {
    SearchRule::Function id;
    const char *displayName;
} StatusFunctions[] = {
    { SearchRule::FuncContains, I18N_NOOP("is")    },
    { SearchRule::FuncContainsNot, I18N_NOOP("is not") }
};
static const int StatusFunctionCount
    = sizeof(StatusFunctions) / sizeof(*StatusFunctions);

//---------------------------------------------------------------------------

QWidget *StatusRuleWidgetHandler::createFunctionWidget(
    int number, QStackedWidget *functionStack, const QObject *receiver, bool /*isBalooSearch*/) const
{
    if (number != 0) {
        return nullptr;
    }

    PimCommon::MinimumComboBox *funcCombo = new PimCommon::MinimumComboBox(functionStack);
    funcCombo->setObjectName(QStringLiteral("statusRuleFuncCombo"));
    for (int i = 0; i < StatusFunctionCount; ++i) {
        funcCombo->addItem(i18n(StatusFunctions[i].displayName));
    }
    funcCombo->adjustSize();
    QObject::connect(funcCombo, SIGNAL(activated(int)),
                     receiver, SLOT(slotFunctionChanged()));
    return funcCombo;
}

//---------------------------------------------------------------------------

QWidget *StatusRuleWidgetHandler::createValueWidget(int number, QStackedWidget *valueStack, const QObject *receiver) const
{
    if (number != 0) {
        return nullptr;
    }

    PimCommon::MinimumComboBox *statusCombo = new PimCommon::MinimumComboBox(valueStack);
    statusCombo->setObjectName(QStringLiteral("statusRuleValueCombo"));
    for (int i = 0; i < MailCommon::StatusValueCountWithoutHidden; ++i) {
        if (MailCommon::StatusValues[ i ].icon != nullptr) {
            statusCombo->addItem(
                SmallIcon(QLatin1String(MailCommon::StatusValues[ i ].icon)),
                i18nc("message status", MailCommon::StatusValues[ i ].text));
        } else {
            statusCombo->addItem(
                i18nc("message status", MailCommon::StatusValues[ i ].text));
        }
    }
    statusCombo->adjustSize();
    QObject::connect(statusCombo, SIGNAL(activated(int)),
                     receiver, SLOT(slotValueChanged()));
    return statusCombo;
}

//---------------------------------------------------------------------------

SearchRule::Function StatusRuleWidgetHandler::currentFunction(
    const QStackedWidget *functionStack) const
{
    const PimCommon::MinimumComboBox *funcCombo
        = functionStack->findChild<PimCommon::MinimumComboBox *>(QStringLiteral("statusRuleFuncCombo"));

    if (funcCombo && funcCombo->currentIndex() >= 0) {
        return StatusFunctions[funcCombo->currentIndex()].id;
    }

    return SearchRule::FuncNone;
}

//---------------------------------------------------------------------------

SearchRule::Function StatusRuleWidgetHandler::function(const QByteArray &field, const QStackedWidget *functionStack) const
{
    if (!handlesField(field)) {
        return SearchRule::FuncNone;
    }

    return currentFunction(functionStack);
}

//---------------------------------------------------------------------------

int StatusRuleWidgetHandler::currentStatusValue(const QStackedWidget *valueStack) const
{
    const PimCommon::MinimumComboBox *statusCombo
        = valueStack->findChild<PimCommon::MinimumComboBox *>(QStringLiteral("statusRuleValueCombo"));

    if (statusCombo) {
        return statusCombo->currentIndex();
    }

    return -1;
}

//---------------------------------------------------------------------------

QString StatusRuleWidgetHandler::value(const QByteArray &field, const QStackedWidget *, const QStackedWidget *valueStack) const
{
    if (!handlesField(field)) {
        return QString();
    }

    const int status = currentStatusValue(valueStack);
    if (status != -1) {
        return QString::fromLatin1(MailCommon::StatusValues[ status ].text);
    } else {
        return QString();
    }
}

//---------------------------------------------------------------------------

QString StatusRuleWidgetHandler::prettyValue(const QByteArray &field, const QStackedWidget *, const QStackedWidget *valueStack) const
{
    if (!handlesField(field)) {
        return QString();
    }

    const int status = currentStatusValue(valueStack);
    if (status != -1) {
        return i18nc("message status", MailCommon::StatusValues[ status ].text);
    } else {
        return QString();
    }
}

//---------------------------------------------------------------------------

bool StatusRuleWidgetHandler::handlesField(const QByteArray &field) const
{
    return field == "<status>";
}

//---------------------------------------------------------------------------

void StatusRuleWidgetHandler::reset(QStackedWidget *functionStack, QStackedWidget *valueStack) const
{
    // reset the function combo box
    PimCommon::MinimumComboBox *funcCombo
        = functionStack->findChild<PimCommon::MinimumComboBox *>(QStringLiteral("statusRuleFuncCombo"));

    if (funcCombo) {
        funcCombo->blockSignals(true);
        funcCombo->setCurrentIndex(0);
        funcCombo->blockSignals(false);
    }

    // reset the status value combo box
    PimCommon::MinimumComboBox *statusCombo
        = valueStack->findChild<PimCommon::MinimumComboBox *>(QStringLiteral("statusRuleValueCombo"));

    if (statusCombo) {
        statusCombo->blockSignals(true);
        statusCombo->setCurrentIndex(0);
        statusCombo->blockSignals(false);
    }
}

//---------------------------------------------------------------------------

bool StatusRuleWidgetHandler::setRule(QStackedWidget *functionStack, QStackedWidget *valueStack, const SearchRule::Ptr rule, bool /*isBalooSearch*/) const
{
    if (!rule || !handlesField(rule->field())) {
        reset(functionStack, valueStack);
        return false;
    }

    // set the function
    const SearchRule::Function func = rule->function();
    int funcIndex = 0;
    for (; funcIndex < StatusFunctionCount; ++funcIndex) {
        if (func == StatusFunctions[funcIndex].id) {
            break;
        }
    }

    PimCommon::MinimumComboBox *funcCombo
        = functionStack->findChild<PimCommon::MinimumComboBox *>(QStringLiteral("statusRuleFuncCombo"));

    if (funcCombo) {
        funcCombo->blockSignals(true);
        if (funcIndex < StatusFunctionCount) {
            funcCombo->setCurrentIndex(funcIndex);
        } else {
            funcCombo->setCurrentIndex(0);
        }
        funcCombo->blockSignals(false);
        functionStack->setCurrentWidget(funcCombo);
    }

    // set the value
    const QString value = rule->contents();
    int valueIndex = 0;
    for (; valueIndex < MailCommon::StatusValueCountWithoutHidden; ++valueIndex) {
        if (value == QString::fromLatin1(MailCommon::StatusValues[ valueIndex ].text)) {
            break;
        }
    }

    PimCommon::MinimumComboBox *statusCombo
        = valueStack->findChild<PimCommon::MinimumComboBox *>(QStringLiteral("statusRuleValueCombo"));

    if (statusCombo) {
        statusCombo->blockSignals(true);
        if (valueIndex < MailCommon::StatusValueCountWithoutHidden) {
            statusCombo->setCurrentIndex(valueIndex);
        } else {
            statusCombo->setCurrentIndex(0);
        }
        statusCombo->blockSignals(false);
        valueStack->setCurrentWidget(statusCombo);
    }
    return true;
}

//---------------------------------------------------------------------------

bool StatusRuleWidgetHandler::update(const QByteArray &field, QStackedWidget *functionStack, QStackedWidget *valueStack) const
{
    if (!handlesField(field)) {
        return false;
    }

    // raise the correct function widget
    functionStack->setCurrentWidget(functionStack->findChild<QWidget *>(QStringLiteral("statusRuleFuncCombo")));

    // raise the correct value widget
    valueStack->setCurrentWidget(valueStack->findChild<QWidget *>(QStringLiteral("statusRuleValueCombo")));

    return true;
}
