/**
    kcookiespolicies.cpp - Cookies configuration

    Original Authors
    SPDX-FileCopyrightText: Waldo Bastian <bastian@kde.org>
    SPDX-FileCopyrightText: 1999 David Faure <faure@kde.org>
    SPDX-FileCopyrightText: 2008 Urs Wolfer <uwolfer @ kde.org>

    Re-written by:
    SPDX-FileCopyrightText: 2000 Dawit Alemayehu <adawit@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

// Own
#include "kcookiespolicies.h"

// Local
#include "../ksaveioconfig.h"

// Qt
#include <QCheckBox>
#include <QDBusInterface>
#include <QDBusReply>
#include <QPushButton>

// KDE
#include <KConfig>
#include <KConfigGroup>
#include <KLocalizedString>
#include <KMessageBox>
#include <QUrl>

// QUrl::fromAce/toAce don't accept a domain that starts with a '.', like we do here.
// So we use these wrappers.
QString tolerantFromAce(const QByteArray &_domain)
{
    QByteArray domain(_domain);
    const bool hasDot = domain.startsWith('.');
    if (hasDot) {
        domain.remove(0, 1);
    }
    QString ret = QUrl::fromAce(domain);
    if (hasDot) {
        ret.prepend(QLatin1Char('.'));
    }
    return ret;
}

static QByteArray tolerantToAce(const QString &_domain)
{
    QString domain(_domain);
    const bool hasDot = domain.startsWith(QLatin1Char('.'));
    if (hasDot) {
        domain.remove(0, 1);
    }
    QByteArray ret = QUrl::toAce(domain);
    if (hasDot) {
        ret.prepend('.');
    }
    return ret;
}

KCookiesPolicies::KCookiesPolicies(QWidget *parent, const QVariantList &args)
    : KCModule(parent, args)
    , mSelectedItemsCount(0)
{
    mUi.setupUi(this);
    mUi.kListViewSearchLine->setTreeWidget(mUi.policyTreeWidget);
    QList<int> columns;
    columns.append(0);
    mUi.kListViewSearchLine->setSearchColumns(columns);

    mUi.pbNew->setIcon(QIcon::fromTheme(QStringLiteral("list-add")));
    mUi.pbChange->setIcon(QIcon::fromTheme(QStringLiteral("edit-rename")));
    mUi.pbDelete->setIcon(QIcon::fromTheme(QStringLiteral("list-remove")));
    mUi.pbDeleteAll->setIcon(QIcon::fromTheme(QStringLiteral("edit-delete")));

    // Connect the main switch :) Enable/disable cookie support
    connect(mUi.cbEnableCookies, &QAbstractButton::toggled, this, &KCookiesPolicies::cookiesEnabled);
    connect(mUi.cbEnableCookies, &QAbstractButton::toggled, this, &KCookiesPolicies::configChanged);

    // Connect the preference check boxes...
    connect(mUi.cbRejectCrossDomainCookies, &QAbstractButton::toggled, this, &KCookiesPolicies::configChanged);
    connect(mUi.cbAutoAcceptSessionCookies, &QAbstractButton::toggled, this, &KCookiesPolicies::configChanged);

    connect(mUi.rbPolicyAsk, &QAbstractButton::toggled, this, &KCookiesPolicies::configChanged);
    connect(mUi.rbPolicyAccept, &QAbstractButton::toggled, this, &KCookiesPolicies::configChanged);
    connect(mUi.rbPolicyAcceptForSession, &QAbstractButton::toggled, this, &KCookiesPolicies::configChanged);
    connect(mUi.rbPolicyReject, &QAbstractButton::toggled, this, &KCookiesPolicies::configChanged);
    // Connect signals from the domain specific policy listview.
    connect(mUi.policyTreeWidget, &QTreeWidget::itemSelectionChanged, this, &KCookiesPolicies::selectionChanged);
    connect(mUi.policyTreeWidget, &QTreeWidget::itemDoubleClicked, this, qOverload<>(&KCookiesPolicies::changePressed));

    // Connect the buttons...
    connect(mUi.pbNew, &QAbstractButton::clicked, this, qOverload<>(&KCookiesPolicies::addPressed));
    connect(mUi.pbChange, &QAbstractButton::clicked, this, qOverload<>(&KCookiesPolicies::changePressed));
    connect(mUi.pbDelete, &QAbstractButton::clicked, this, &KCookiesPolicies::deletePressed);
    connect(mUi.pbDeleteAll, &QAbstractButton::clicked, this, &KCookiesPolicies::deleteAllPressed);
}

KCookiesPolicies::~KCookiesPolicies()
{
}

void KCookiesPolicies::configChanged()
{
    // kDebug() << "KCookiesPolicies::configChanged...";
    Q_EMIT changed(true);
}

void KCookiesPolicies::cookiesEnabled(bool enable)
{
    mUi.bgDefault->setEnabled(enable);
    mUi.bgPreferences->setEnabled(enable);
    mUi.gbDomainSpecific->setEnabled(enable);
}

void KCookiesPolicies::setPolicy(const QString &domain)
{
    QTreeWidgetItemIterator it(mUi.policyTreeWidget);
    bool hasExistingPolicy = false;
    while (*it) {
        if ((*it)->text(0) == domain) {
            hasExistingPolicy = true;
            break;
        }
        ++it;
    }

    if (hasExistingPolicy) {
        changePressed((*it), false);
    } else {
        addPressed(domain);
    }
}

void KCookiesPolicies::changePressed()
{
    changePressed(mUi.policyTreeWidget->currentItem());
}

void KCookiesPolicies::addPressed()
{
    addPressed(QString());
}

void KCookiesPolicies::changePressed(QTreeWidgetItem *item, bool state)
{
    Q_ASSERT(item);
    const QString oldDomain(item->text(0));

    KCookiesPolicySelectionDlg pdlg(this);
    pdlg.setWindowTitle(i18nc("@title:window", "Change Cookie Policy"));
    pdlg.setPolicy(KCookieAdvice::strToAdvice(QString::fromLatin1(mDomainPolicyMap.value(oldDomain))));
    pdlg.setEnableHostEdit(state, oldDomain);

    if (pdlg.exec() && !pdlg.domain().isEmpty()) {
        const QString newDomain = tolerantFromAce(pdlg.domain().toLatin1());
        int advice = pdlg.advice();
        if (newDomain == oldDomain || !handleDuplicate(newDomain, advice)) {
            mDomainPolicyMap[newDomain] = KCookieAdvice::adviceToStr(advice);
            item->setText(0, newDomain);
            item->setText(1, i18n(mDomainPolicyMap.value(newDomain)));
            configChanged();
        }
    }
}

void KCookiesPolicies::addPressed(const QString &domain, bool state)
{
    KCookiesPolicySelectionDlg pdlg(this);
    pdlg.setWindowTitle(i18nc("@title:window", "New Cookie Policy"));
    pdlg.setEnableHostEdit(state, domain);

    if (mUi.rbPolicyAccept->isChecked()) {
        pdlg.setPolicy(KCookieAdvice::Reject);
    } else {
        pdlg.setPolicy(KCookieAdvice::Accept);
    }

    if (pdlg.exec() && !pdlg.domain().isEmpty()) {
        const QString domain = tolerantFromAce(pdlg.domain().toLatin1());
        int advice = pdlg.advice();

        if (!handleDuplicate(domain, advice)) {
            const char *strAdvice = KCookieAdvice::adviceToStr(advice);
            const QStringList items{
                domain,
                i18n(strAdvice),
            };
            QTreeWidgetItem *item = new QTreeWidgetItem(mUi.policyTreeWidget, items);
            mDomainPolicyMap.insert(item->text(0), strAdvice);
            configChanged();
            updateButtons();
        }
    }
}

bool KCookiesPolicies::handleDuplicate(const QString &domain, int advice)
{
    QTreeWidgetItem *item = mUi.policyTreeWidget->topLevelItem(0);
    while (item != nullptr) {
        if (item->text(0) == domain) {
            const int res = KMessageBox::warningContinueCancel(this,
                                                               i18n("<qt>A policy already exists for"
                                                                    "<center><b>%1</b></center>"
                                                                    "Do you want to replace it?</qt>",
                                                                    domain),
                                                               i18nc("@title:window", "Duplicate Policy"),
                                                               KGuiItem(i18n("Replace")));
            if (res == KMessageBox::Continue) {
                mDomainPolicyMap[domain] = KCookieAdvice::adviceToStr(advice);
                item->setText(0, domain);
                item->setText(1, i18n(mDomainPolicyMap.value(domain)));
                configChanged();
                return true;
            } else {
                return true; // User Cancelled!!
            }
        }
        item = mUi.policyTreeWidget->itemBelow(item);
    }
    return false;
}

void KCookiesPolicies::deletePressed()
{
    QTreeWidgetItem *nextItem = nullptr;

    const QList<QTreeWidgetItem *> selectedItems = mUi.policyTreeWidget->selectedItems();
    for (const QTreeWidgetItem *item : selectedItems) {
        nextItem = mUi.policyTreeWidget->itemBelow(item);
        if (!nextItem) {
            nextItem = mUi.policyTreeWidget->itemAbove(item);
        }

        mDomainPolicyMap.remove(item->text(0));
        delete item;
    }

    if (nextItem) {
        nextItem->setSelected(true);
    }

    updateButtons();
    configChanged();
}

void KCookiesPolicies::deleteAllPressed()
{
    mDomainPolicyMap.clear();
    mUi.policyTreeWidget->clear();
    updateButtons();
    configChanged();
}

void KCookiesPolicies::updateButtons()
{
    bool hasItems = mUi.policyTreeWidget->topLevelItemCount() > 0;

    mUi.pbChange->setEnabled((hasItems && mSelectedItemsCount == 1));
    mUi.pbDelete->setEnabled((hasItems && mSelectedItemsCount > 0));
    mUi.pbDeleteAll->setEnabled(hasItems);
}

void KCookiesPolicies::updateDomainList(const QStringList &domainConfig)
{
    mUi.policyTreeWidget->clear();

    QStringList::ConstIterator it = domainConfig.begin();
    for (; it != domainConfig.end(); ++it) {
        QString domain;
        KCookieAdvice::Value advice = KCookieAdvice::Dunno;
        splitDomainAdvice(*it, domain, advice);
        if (!domain.isEmpty()) {
            const QStringList items{
                tolerantFromAce(domain.toLatin1()),
                i18n(KCookieAdvice::adviceToStr(advice)),
            };
            QTreeWidgetItem *item = new QTreeWidgetItem(mUi.policyTreeWidget, items);
            mDomainPolicyMap[item->text(0)] = KCookieAdvice::adviceToStr(advice);
        }
    }

    mUi.policyTreeWidget->sortItems(0, Qt::AscendingOrder);
}

void KCookiesPolicies::selectionChanged()
{
    mSelectedItemsCount = mUi.policyTreeWidget->selectedItems().count();
    updateButtons();
}

void KCookiesPolicies::load()
{
    mSelectedItemsCount = 0;

    KConfig cfg(QStringLiteral("kcookiejarrc"));
    KConfigGroup group = cfg.group("Cookie Policy");

    bool enableCookies = group.readEntry("Cookies", true);
    mUi.cbEnableCookies->setChecked(enableCookies);
    cookiesEnabled(enableCookies);

    // Warning: the default values are duplicated in kcookiejar.cpp
    KCookieAdvice::Value advice = KCookieAdvice::strToAdvice(group.readEntry("CookieGlobalAdvice", "Accept"));
    switch (advice) {
    case KCookieAdvice::Accept:
        mUi.rbPolicyAccept->setChecked(true);
        break;
    case KCookieAdvice::AcceptForSession:
        mUi.rbPolicyAcceptForSession->setChecked(true);
        break;
    case KCookieAdvice::Reject:
        mUi.rbPolicyReject->setChecked(true);
        break;
    case KCookieAdvice::Ask:
    case KCookieAdvice::Dunno:
    default:
        mUi.rbPolicyAsk->setChecked(true);
    }

    bool enable = group.readEntry("RejectCrossDomainCookies", true);
    mUi.cbRejectCrossDomainCookies->setChecked(enable);

    bool sessionCookies = group.readEntry("AcceptSessionCookies", true);
    mUi.cbAutoAcceptSessionCookies->setChecked(sessionCookies);
    updateDomainList(group.readEntry("CookieDomainAdvice", QStringList()));

    if (enableCookies) {
        updateButtons();
    }
}

void KCookiesPolicies::save()
{
    KConfig cfg(QStringLiteral("kcookiejarrc"));
    KConfigGroup group = cfg.group("Cookie Policy");

    bool state = mUi.cbEnableCookies->isChecked();
    group.writeEntry("Cookies", state);
    state = mUi.cbRejectCrossDomainCookies->isChecked();
    group.writeEntry("RejectCrossDomainCookies", state);
    state = mUi.cbAutoAcceptSessionCookies->isChecked();
    group.writeEntry("AcceptSessionCookies", state);

    QString advice;
    if (mUi.rbPolicyAccept->isChecked()) {
        advice = QString::fromLatin1(KCookieAdvice::adviceToStr(KCookieAdvice::Accept));
    } else if (mUi.rbPolicyAcceptForSession->isChecked()) {
        advice = QString::fromLatin1(KCookieAdvice::adviceToStr(KCookieAdvice::AcceptForSession));
    } else if (mUi.rbPolicyReject->isChecked()) {
        advice = QString::fromLatin1(KCookieAdvice::adviceToStr(KCookieAdvice::Reject));
    } else {
        advice = QString::fromLatin1(KCookieAdvice::adviceToStr(KCookieAdvice::Ask));
    }

    group.writeEntry("CookieGlobalAdvice", advice);

    QStringList domainConfig;
    QMapIterator<QString, const char *> it(mDomainPolicyMap);
    while (it.hasNext()) {
        it.next();
        const QString policy = QLatin1String(tolerantToAce(it.key())) + QLatin1Char(':') + QLatin1String(it.value());
        domainConfig << policy;
    }

    group.writeEntry("CookieDomainAdvice", domainConfig);
    group.sync();

    // Update the cookiejar...
    if (!mUi.cbEnableCookies->isChecked()) {
        QDBusInterface kded(QStringLiteral("org.kde.kcookiejar5"),
                            QStringLiteral("/modules/kcookiejar"),
                            QStringLiteral("org.kde.KCookieServer"),
                            QDBusConnection::sessionBus());
        kded.call(QStringLiteral("shutdown"));
    } else {
        QDBusInterface kded(QStringLiteral("org.kde.kcookiejar5"),
                            QStringLiteral("/modules/kcookiejar"),
                            QStringLiteral("org.kde.KCookieServer"),
                            QDBusConnection::sessionBus());
        QDBusReply<void> reply = kded.call(QStringLiteral("reloadPolicy"));
        if (!reply.isValid()) {
            KMessageBox::error(nullptr,
                               i18n("Unable to communicate with the cookie handler service.\n"
                                    "Any changes you made will not take effect until the service "
                                    "is restarted."));
        }
    }

    // Force running io-slave to reload configurations...
    KSaveIOConfig::updateRunningIOSlaves(this);
    Q_EMIT changed(false);
}

void KCookiesPolicies::defaults()
{
    mUi.cbEnableCookies->setChecked(true);
    mUi.rbPolicyAsk->setChecked(true);
    mUi.rbPolicyAccept->setChecked(false);
    mUi.rbPolicyAcceptForSession->setChecked(false);
    mUi.rbPolicyReject->setChecked(false);
    mUi.cbRejectCrossDomainCookies->setChecked(true);
    mUi.cbAutoAcceptSessionCookies->setChecked(false);
    mUi.policyTreeWidget->clear();
    mDomainPolicyMap.clear();

    cookiesEnabled(mUi.cbEnableCookies->isChecked());
    updateButtons();
}

void KCookiesPolicies::splitDomainAdvice(const QString &cfg, QString &domain, KCookieAdvice::Value &advice)
{
    int sepPos = cfg.lastIndexOf(QLatin1Char(':'));

    // Ignore any policy that does not contain a domain...
    if (sepPos <= 0) {
        return;
    }

    domain = cfg.left(sepPos);
    advice = KCookieAdvice::strToAdvice(cfg.mid(sepPos + 1));
}

QString KCookiesPolicies::quickHelp() const
{
    return i18n(
        "<h1>Cookies</h1><p>Cookies contain information that KDE"
        " application using the HTTP protocol (like Konqueror) stores"
        " on your computer from a remote Internet server. This means"
        " that a web server can store information about you and your"
        " browsing activities on your machine for later use. You might"
        " consider this an invasion of privacy.</p><p>However, cookies are"
        " useful in certain situations. For example, they are often used"
        " by Internet shops, so you can 'put things into a shopping"
        " basket'. Some sites require you have a browser that supports"
        " cookies.</p><p>Because most people want a compromise between privacy"
        " and the benefits cookies offer, KDE offers you the ability to"
        " customize the way it handles cookies. You might, for example"
        " want to set KDE's default policy to ask you whenever a server"
        " wants to set a cookie or simply reject or accept everything."
        " For example, you might choose to accept all cookies from your"
        " favorite shopping web site. For this all you have to do is"
        " either browse to that particular site and when you are presented"
        " with the cookie dialog box, click on <i> This domain </i> under"
        " the 'apply to' tab and choose accept or simply specify the name"
        " of the site in the <i> Domain Specific Policy </i> tab and set"
        " it to accept. This enables you to receive cookies from trusted"
        " web sites without being asked every time KDE receives a cookie.</p>");
}
