/***************************************************************************
 *   Copyright (C) 2005-2022 by the Quassel Project                        *
 *   devel@quassel-irc.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) version 3.                                           *
 *                                                                         *
 *   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 "appearancesettingspage.h"

#include <QCheckBox>
#include <QDir>
#include <QFile>
#include <QFileDialog>
#include <QStyleFactory>

#include "buffersettings.h"
#include "qtui.h"
#include "qtuisettings.h"
#include "qtuistyle.h"

AppearanceSettingsPage::AppearanceSettingsPage(QWidget* parent)
    : SettingsPage(tr("Interface"), QString(), parent)
{
    ui.setupUi(this);

#ifdef QT_NO_SYSTEMTRAYICON
    ui.useSystemTrayIcon->hide();
#endif

    // If no system icon theme is given, showing the override option makes no sense.
    // Also don't mention a "fallback".
    if (QtUi::instance()->systemIconTheme().isEmpty()) {
        ui.iconThemeLabel->setText(tr("Icon theme:"));
        ui.overrideSystemIconTheme->hide();
    }

    initAutoWidgets();
    initStyleComboBox();
    initLanguageComboBox();
    initIconThemeComboBox();

    foreach (QComboBox* comboBox, findChildren<QComboBox*>()) {
        connect(comboBox, &QComboBox::currentTextChanged, this, &AppearanceSettingsPage::widgetHasChanged);
    }
    foreach (QCheckBox* checkBox, findChildren<QCheckBox*>()) {
        connect(checkBox, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
    }

    connect(ui.chooseStyleSheet, &QAbstractButton::clicked, this, &AppearanceSettingsPage::chooseStyleSheet);

    connect(ui.userNoticesInDefaultBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
    connect(ui.userNoticesInStatusBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
    connect(ui.userNoticesInCurrentBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);

    connect(ui.serverNoticesInDefaultBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
    connect(ui.serverNoticesInStatusBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
    connect(ui.serverNoticesInCurrentBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);

    connect(ui.errorMsgsInDefaultBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
    connect(ui.errorMsgsInStatusBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
    connect(ui.errorMsgsInCurrentBuffer, &QAbstractButton::clicked, this, &AppearanceSettingsPage::widgetHasChanged);
}

void AppearanceSettingsPage::initStyleComboBox()
{
    QStringList styleList = QStyleFactory::keys();
    ui.styleComboBox->addItem(tr("<System Default>"));
    foreach (QString style, styleList) {
        ui.styleComboBox->addItem(style);
    }
}

void AppearanceSettingsPage::initLanguageComboBox()
{
    QDir i18nDir(Quassel::translationDirPath(), "*.qm");

    QRegExp rx("(qt_)?([a-zA-Z_]+)\\.qm");
    foreach (QString translationFile, i18nDir.entryList()) {
        if (!rx.exactMatch(translationFile))
            continue;
        if (!rx.cap(1).isEmpty())
            continue;
        QLocale locale(rx.cap(2));
        _locales[QLocale::languageToString(locale.language())] = locale;
    }
    foreach (QString language, _locales.keys()) {
        ui.languageComboBox->addItem(language);
    }
}

void AppearanceSettingsPage::initIconThemeComboBox()
{
    auto availableThemes = QtUi::instance()->availableIconThemes();

    ui.iconThemeComboBox->addItem(tr("Automatic"), QString{});
    for (auto&& p : QtUi::instance()->availableIconThemes()) {
        ui.iconThemeComboBox->addItem(p.second, p.first);
    }
}

void AppearanceSettingsPage::defaults()
{
    ui.styleComboBox->setCurrentIndex(0);
    ui.languageComboBox->setCurrentIndex(1);

    SettingsPage::defaults();
    widgetHasChanged();
}

void AppearanceSettingsPage::load()
{
    QtUiSettings uiSettings;

    // Gui Style
    QString style = uiSettings.value("Style", QString("")).toString();
    if (style.isEmpty()) {
        ui.styleComboBox->setCurrentIndex(0);
    }
    else {
        ui.styleComboBox->setCurrentIndex(ui.styleComboBox->findText(style, Qt::MatchExactly));
    }
    ui.styleComboBox->setProperty("storedValue", ui.styleComboBox->currentIndex());

    // Language
    QLocale locale = uiSettings.value("Locale", QLocale::system()).value<QLocale>();
    if (locale == QLocale::system())
        ui.languageComboBox->setCurrentIndex(1);
    else if (locale.language() == QLocale::C)  // we use C for "untranslated"
        ui.languageComboBox->setCurrentIndex(0);
    else
        ui.languageComboBox->setCurrentIndex(ui.languageComboBox->findText(QLocale::languageToString(locale.language()), Qt::MatchExactly));
    ui.languageComboBox->setProperty("storedValue", ui.languageComboBox->currentIndex());
    Quassel::loadTranslation(selectedLocale());

    // IconTheme
    QString icontheme = UiStyleSettings{}.value("Icons/FallbackTheme", QString{}).toString();
    if (icontheme.isEmpty()) {
        ui.iconThemeComboBox->setCurrentIndex(0);
    }
    else {
        auto idx = ui.iconThemeComboBox->findData(icontheme);
        ui.iconThemeComboBox->setCurrentIndex(idx > 0 ? idx : 0);
    }
    ui.iconThemeComboBox->setProperty("storedValue", ui.iconThemeComboBox->currentIndex());

    // bufferSettings:
    BufferSettings bufferSettings;
    int redirectTarget = bufferSettings.userNoticesTarget();
    SettingsPage::load(ui.userNoticesInDefaultBuffer, redirectTarget & BufferSettings::DefaultBuffer);
    SettingsPage::load(ui.userNoticesInStatusBuffer, redirectTarget & BufferSettings::StatusBuffer);
    SettingsPage::load(ui.userNoticesInCurrentBuffer, redirectTarget & BufferSettings::CurrentBuffer);

    redirectTarget = bufferSettings.serverNoticesTarget();
    SettingsPage::load(ui.serverNoticesInDefaultBuffer, redirectTarget & BufferSettings::DefaultBuffer);
    SettingsPage::load(ui.serverNoticesInStatusBuffer, redirectTarget & BufferSettings::StatusBuffer);
    SettingsPage::load(ui.serverNoticesInCurrentBuffer, redirectTarget & BufferSettings::CurrentBuffer);

    redirectTarget = bufferSettings.errorMsgsTarget();
    SettingsPage::load(ui.errorMsgsInDefaultBuffer, redirectTarget & BufferSettings::DefaultBuffer);
    SettingsPage::load(ui.errorMsgsInStatusBuffer, redirectTarget & BufferSettings::StatusBuffer);
    SettingsPage::load(ui.errorMsgsInCurrentBuffer, redirectTarget & BufferSettings::CurrentBuffer);

    SettingsPage::load();
    setChangedState(false);
}

void AppearanceSettingsPage::save()
{
    QtUiSettings uiSettings;
    UiStyleSettings styleSettings;

    if (ui.styleComboBox->currentIndex() < 1) {
        uiSettings.setValue("Style", QString(""));
    }
    else {
        uiSettings.setValue("Style", ui.styleComboBox->currentText());
        QApplication::setStyle(ui.styleComboBox->currentText());
    }
    ui.styleComboBox->setProperty("storedValue", ui.styleComboBox->currentIndex());

    if (ui.languageComboBox->currentIndex() == 1) {
        uiSettings.remove("Locale");  // force the default (QLocale::system())
    }
    else {
        uiSettings.setValue("Locale", selectedLocale());
    }
    ui.languageComboBox->setProperty("storedValue", ui.languageComboBox->currentIndex());

    bool needsIconThemeRefresh = ui.iconThemeComboBox->currentIndex() != ui.iconThemeComboBox->property("storedValue").toInt()
                                 || ui.overrideSystemIconTheme->isChecked() != ui.overrideSystemIconTheme->property("storedValue").toBool();

    auto iconTheme = selectedIconTheme();
    if (iconTheme.isEmpty()) {
        styleSettings.remove("Icons/FallbackTheme");
    }
    else {
        styleSettings.setValue("Icons/FallbackTheme", iconTheme);
    }
    ui.iconThemeComboBox->setProperty("storedValue", ui.iconThemeComboBox->currentIndex());

    bool needsStyleReload = ui.useCustomStyleSheet->isChecked() != ui.useCustomStyleSheet->property("storedValue").toBool()
                            || (ui.useCustomStyleSheet->isChecked()
                                && ui.customStyleSheetPath->text() != ui.customStyleSheetPath->property("storedValue").toString());

    BufferSettings bufferSettings;
    int redirectTarget = 0;
    if (ui.userNoticesInDefaultBuffer->isChecked())
        redirectTarget |= BufferSettings::DefaultBuffer;
    if (ui.userNoticesInStatusBuffer->isChecked())
        redirectTarget |= BufferSettings::StatusBuffer;
    if (ui.userNoticesInCurrentBuffer->isChecked())
        redirectTarget |= BufferSettings::CurrentBuffer;
    bufferSettings.setUserNoticesTarget(redirectTarget);

    redirectTarget = 0;
    if (ui.serverNoticesInDefaultBuffer->isChecked())
        redirectTarget |= BufferSettings::DefaultBuffer;
    if (ui.serverNoticesInStatusBuffer->isChecked())
        redirectTarget |= BufferSettings::StatusBuffer;
    if (ui.serverNoticesInCurrentBuffer->isChecked())
        redirectTarget |= BufferSettings::CurrentBuffer;
    bufferSettings.setServerNoticesTarget(redirectTarget);

    redirectTarget = 0;
    if (ui.errorMsgsInDefaultBuffer->isChecked())
        redirectTarget |= BufferSettings::DefaultBuffer;
    if (ui.errorMsgsInStatusBuffer->isChecked())
        redirectTarget |= BufferSettings::StatusBuffer;
    if (ui.errorMsgsInCurrentBuffer->isChecked())
        redirectTarget |= BufferSettings::CurrentBuffer;
    bufferSettings.setErrorMsgsTarget(redirectTarget);

    SettingsPage::save();
    setChangedState(false);
    if (needsStyleReload)
        QtUi::style()->reload();
    if (needsIconThemeRefresh)
        QtUi::instance()->refreshIconTheme();
}

QLocale AppearanceSettingsPage::selectedLocale() const
{
    QLocale locale;
    int index = ui.languageComboBox->currentIndex();
    if (index == 1)
        locale = QLocale::system();
    else if (index == 0)
        locale = QLocale::c();
    else if (index > 1)
        locale = _locales.values()[index - 2];

    return locale;
}

QString AppearanceSettingsPage::selectedIconTheme() const
{
    return ui.iconThemeComboBox->itemData(ui.iconThemeComboBox->currentIndex()).toString();
}

void AppearanceSettingsPage::chooseStyleSheet()
{
    QString dir = ui.customStyleSheetPath->property("storedValue").toString();
    if (!dir.isEmpty() && QFile(dir).exists())
        dir = QDir(dir).absolutePath();
    else
        dir = QDir(Quassel::findDataFilePath("default.qss")).absolutePath();

    QString name = QFileDialog::getOpenFileName(this, tr("Please choose a stylesheet file"), dir, "*.qss");
    if (!name.isEmpty())
        ui.customStyleSheetPath->setText(name);
}

void AppearanceSettingsPage::widgetHasChanged()
{
    setChangedState(testHasChanged());
}

bool AppearanceSettingsPage::testHasChanged()
{
    if (ui.styleComboBox->currentIndex() != ui.styleComboBox->property("storedValue").toInt())
        return true;
    if (ui.languageComboBox->currentIndex() != ui.languageComboBox->property("storedValue").toInt())
        return true;
    if (ui.iconThemeComboBox->currentIndex() != ui.iconThemeComboBox->property("storedValue").toInt())
        return true;

    if (SettingsPage::hasChanged(ui.userNoticesInStatusBuffer))
        return true;
    if (SettingsPage::hasChanged(ui.userNoticesInDefaultBuffer))
        return true;
    if (SettingsPage::hasChanged(ui.userNoticesInCurrentBuffer))
        return true;

    if (SettingsPage::hasChanged(ui.serverNoticesInStatusBuffer))
        return true;
    if (SettingsPage::hasChanged(ui.serverNoticesInDefaultBuffer))
        return true;
    if (SettingsPage::hasChanged(ui.serverNoticesInCurrentBuffer))
        return true;

    if (SettingsPage::hasChanged(ui.errorMsgsInStatusBuffer))
        return true;
    if (SettingsPage::hasChanged(ui.errorMsgsInDefaultBuffer))
        return true;
    if (SettingsPage::hasChanged(ui.errorMsgsInCurrentBuffer))
        return true;

    return false;
}
