/***************************************************************************
*    Copyright (C) 2012 by Peter Penz <peter.penz19@gmail.com>            *
*    Copyright (C) 2019 by Ismael Asensio <isma.af@mgmail.com>            *
*                                                                         *
*    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 "dolphinfacetswidget.h"

#include <KLocalizedString>

#include <QComboBox>
#include <QDate>
#include <QEvent>
#include <QHBoxLayout>
#include <QIcon>
#include <QMenu>
#include <QToolButton>

DolphinFacetsWidget::DolphinFacetsWidget(QWidget* parent) :
    QWidget(parent),
    m_typeSelector(nullptr),
    m_dateSelector(nullptr),
    m_ratingSelector(nullptr),
    m_tagsSelector(nullptr)
{
    m_typeSelector = new QComboBox(this);
    m_typeSelector->addItem(QIcon::fromTheme(QStringLiteral("none")), i18nc("@item:inlistbox", "Any Type"), QString());
    m_typeSelector->addItem(QIcon::fromTheme(QStringLiteral("inode-directory")), i18nc("@item:inlistbox", "Folders") , QStringLiteral("Folder"));
    m_typeSelector->addItem(QIcon::fromTheme(QStringLiteral("text-x-generic")), i18nc("@item:inlistbox", "Documents") , QStringLiteral("Document"));
    m_typeSelector->addItem(QIcon::fromTheme(QStringLiteral("image-x-generic")), i18nc("@item:inlistbox", "Images") , QStringLiteral("Image"));
    m_typeSelector->addItem(QIcon::fromTheme(QStringLiteral("audio-x-generic")), i18nc("@item:inlistbox", "Audio Files"), QStringLiteral("Audio"));
    m_typeSelector->addItem(QIcon::fromTheme(QStringLiteral("video-x-generic")), i18nc("@item:inlistbox", "Videos") , QStringLiteral("Video"));
    initComboBox(m_typeSelector);

    const QDate currentDate = QDate::currentDate();

    m_dateSelector = new QComboBox(this);
    m_dateSelector->addItem(QIcon::fromTheme(QStringLiteral("view-calendar")), i18nc("@item:inlistbox", "Any Date"), QDate());
    m_dateSelector->addItem(QIcon::fromTheme(QStringLiteral("go-jump-today")), i18nc("@item:inlistbox", "Today") , currentDate);
    m_dateSelector->addItem(QIcon::fromTheme(QStringLiteral("go-jump-today")), i18nc("@item:inlistbox", "Yesterday") , currentDate.addDays(-1));
    m_dateSelector->addItem(QIcon::fromTheme(QStringLiteral("view-calendar-week")), i18nc("@item:inlistbox", "This Week") , currentDate.addDays(1 - currentDate.dayOfWeek()));
    m_dateSelector->addItem(QIcon::fromTheme(QStringLiteral("view-calendar-month")), i18nc("@item:inlistbox", "This Month"), currentDate.addDays(1 - currentDate.day()));
    m_dateSelector->addItem(QIcon::fromTheme(QStringLiteral("view-calendar-year")), i18nc("@item:inlistbox", "This Year") , currentDate.addDays(1 - currentDate.dayOfYear()));
    initComboBox(m_dateSelector);

    m_ratingSelector = new QComboBox(this);
    m_ratingSelector->addItem(QIcon::fromTheme(QStringLiteral("non-starred-symbolic")), i18nc("@item:inlistbox", "Any Rating"), 0);
    m_ratingSelector->addItem(QIcon::fromTheme(QStringLiteral("starred-symbolic")), i18nc("@item:inlistbox", "1 or more"), 1);
    m_ratingSelector->addItem(QIcon::fromTheme(QStringLiteral("starred-symbolic")), i18nc("@item:inlistbox", "2 or more"), 2);
    m_ratingSelector->addItem(QIcon::fromTheme(QStringLiteral("starred-symbolic")), i18nc("@item:inlistbox", "3 or more"), 3);
    m_ratingSelector->addItem(QIcon::fromTheme(QStringLiteral("starred-symbolic")), i18nc("@item:inlistbox", "4 or more"), 4);
    m_ratingSelector->addItem(QIcon::fromTheme(QStringLiteral("starred-symbolic")), i18nc("@item:inlistbox", "Highest Rating"), 5);
    initComboBox(m_ratingSelector);

    m_tagsSelector = new QToolButton(this);
    m_tagsSelector->setIcon(QIcon::fromTheme(QStringLiteral("tag")));
    m_tagsSelector->setMenu(new QMenu(this));
    m_tagsSelector->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    m_tagsSelector->setPopupMode(QToolButton::MenuButtonPopup);
    m_tagsSelector->setAutoRaise(true);
    updateTagsSelector();

    connect(m_tagsSelector, &QToolButton::clicked, m_tagsSelector, &QToolButton::showMenu);
    connect(m_tagsSelector->menu(), &QMenu::aboutToShow, this, &DolphinFacetsWidget::updateTagsMenu);
    connect(&m_tagsLister, &KCoreDirLister::itemsAdded, this, &DolphinFacetsWidget::updateTagsMenuItems);
    updateTagsMenu();

    QHBoxLayout* topLayout = new QHBoxLayout(this);
    topLayout->setContentsMargins(0, 0, 0, 0);
    topLayout->addWidget(m_typeSelector);
    topLayout->addWidget(m_dateSelector);
    topLayout->addWidget(m_ratingSelector);
    topLayout->addWidget(m_tagsSelector);

    resetSearchTerms();
}

DolphinFacetsWidget::~DolphinFacetsWidget()
{
}

void DolphinFacetsWidget::changeEvent(QEvent *event)
{
    if (event->type() == QEvent::EnabledChange) {
        if (isEnabled()) {
            updateTagsSelector();
        } else {
            resetSearchTerms();
        }
    }
}

void DolphinFacetsWidget::resetSearchTerms()
{
    m_typeSelector->setCurrentIndex(0);
    m_dateSelector->setCurrentIndex(0);
    m_ratingSelector->setCurrentIndex(0);

    m_searchTags = QStringList();
    updateTagsSelector();
    updateTagsMenu();
}

QStringList DolphinFacetsWidget::searchTerms() const
{
    QStringList terms;

    if (m_ratingSelector->currentIndex() > 0) {
        const int rating = m_ratingSelector->currentData().toInt() * 2;
        terms << QStringLiteral("rating>=%1").arg(rating);
    }

    if (m_dateSelector->currentIndex() > 0) {
        const QDate date = m_dateSelector->currentData().toDate();
        terms << QStringLiteral("modified>=%1").arg(date.toString(Qt::ISODate));
    }

    if (!m_searchTags.isEmpty()) {
        for (auto const &tag : m_searchTags) {
            if (tag.contains(QLatin1Char(' '))) {
                terms << QStringLiteral("tag:\"%1\"").arg(tag);
            } else {
                terms << QStringLiteral("tag:%1").arg(tag);
            }
        }
    }

    return terms;
}

QString DolphinFacetsWidget::facetType() const
{
    return m_typeSelector->currentData().toString();
}

bool DolphinFacetsWidget::isSearchTerm(const QString& term) const
{
    static const QLatin1String searchTokens[] {
        QLatin1String("modified>="),
        QLatin1String("rating>="),
        QLatin1String("tag:"), QLatin1String("tag=")
    };

    for (const auto &searchToken : searchTokens) {
        if (term.startsWith(searchToken)) {
            return true;
        }
    }
    return false;
}

void DolphinFacetsWidget::setSearchTerm(const QString& term)
{
    if (term.startsWith(QLatin1String("modified>="))) {
        const QString value = term.mid(10);
        const QDate date = QDate::fromString(value, Qt::ISODate);
        setTimespan(date);
    } else if (term.startsWith(QLatin1String("rating>="))) {
        const QString value = term.mid(8);
        const int stars = value.toInt() / 2;
        setRating(stars);
    } else if (term.startsWith(QLatin1String("tag:")) ||
               term.startsWith(QLatin1String("tag="))) {
        const QString value = term.mid(4);
        addSearchTag(value);
    }
}

void DolphinFacetsWidget::setFacetType(const QString& type)
{
    for (int index = 0; index <= m_typeSelector->count(); index++) {
        if (type == m_typeSelector->itemData(index).toString()) {
            m_typeSelector->setCurrentIndex(index);
            break;
        }
    }
}

void DolphinFacetsWidget::setRating(const int stars)
{
    if (stars < 0 || stars > 5) {
        return;
    }
    m_ratingSelector->setCurrentIndex(stars);
}

void DolphinFacetsWidget::setTimespan(const QDate& date)
{
    if (!date.isValid()) {
        return;
    }
    m_dateSelector->setCurrentIndex(0);
    for (int index = 1; index <= m_dateSelector->count(); index++) {
        if (date >= m_dateSelector->itemData(index).toDate()) {
            m_dateSelector->setCurrentIndex(index);
            break;
        }
    }
}

void DolphinFacetsWidget::addSearchTag(const QString& tag)
{
    if (tag.isEmpty() || m_searchTags.contains(tag)) {
        return;
    }
    m_searchTags.append(tag);
    m_searchTags.sort();
    updateTagsSelector();
}

void DolphinFacetsWidget::removeSearchTag(const QString& tag)
{
    if (tag.isEmpty() || !m_searchTags.contains(tag)) {
        return;
    }
    m_searchTags.removeAll(tag);
    updateTagsSelector();
}

void DolphinFacetsWidget::initComboBox(QComboBox* combo)
{
    combo->setFrame(false);
    combo->setMinimumHeight(parentWidget()->height());
    combo->setCurrentIndex(0);
    connect(combo, QOverload<int>::of(&QComboBox::activated), this, &DolphinFacetsWidget::facetChanged);
}

void DolphinFacetsWidget::updateTagsSelector()
{
    const bool hasListedTags = !m_tagsSelector->menu()->isEmpty();
    const bool hasSelectedTags = !m_searchTags.isEmpty();

    if (hasSelectedTags) {
        const QString tagsText = m_searchTags.join(i18nc("String list separator", ", "));
        m_tagsSelector->setText(i18ncp("@action:button %2 is a list of tags",
                                       "Tag: %2", "Tags: %2",m_searchTags.count(), tagsText));
    } else {
        m_tagsSelector->setText(i18nc("@action:button", "Add Tags"));
    }

    m_tagsSelector->setEnabled(isEnabled() && (hasListedTags || hasSelectedTags));
}

void DolphinFacetsWidget::updateTagsMenu()
{
    updateTagsMenuItems({}, {});
    m_tagsLister.openUrl(QUrl(QStringLiteral("tags:/")), KCoreDirLister::OpenUrlFlag::Reload);
}

void DolphinFacetsWidget::updateTagsMenuItems(const QUrl&, const KFileItemList& items)
{
    m_tagsSelector->menu()->clear();

    QStringList allTags = QStringList(m_searchTags);
    for (const KFileItem &item: items) {
        allTags.append(item.name());
    }
    allTags.sort(Qt::CaseInsensitive);
    allTags.removeDuplicates();

    const bool onlyOneTag = allTags.count() == 1;

    for (const QString& tagName : qAsConst(allTags)) {
        QAction* action = m_tagsSelector->menu()->addAction(QIcon::fromTheme(QStringLiteral("tag")), tagName);
        action->setCheckable(true);
        action->setChecked(m_searchTags.contains(tagName));

        connect(action, &QAction::triggered, this, [this, tagName, onlyOneTag](bool isChecked) {
            if (isChecked) {
                addSearchTag(tagName);
            } else {
                removeSearchTag(tagName);
            }
            emit facetChanged();

            if (!onlyOneTag) {
                m_tagsSelector->menu()->show();
            }
        });
    }

    updateTagsSelector();
}
