/*
 * SPDX-FileCopyrightText: 1999 Reginald Stadlbauer <reggie@kde.org>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "kcharselectdia.h"

#include <QAction>
#include <QApplication>
#include <QClipboard>
#include <QDir>
#include <QFontDatabase>
#include <QGridLayout>
#include <QIcon>
#include <QMenu>

#include <KActionCollection>
#include <KBookmarkManager>
#include <KBookmarkMenu>
#include <KBookmarkOwner>
#include <KConfigGroup>
#include <KLocalizedString>
#include <KSharedConfig>
#include <KStandardAction>
#include <KStandardShortcut>
#include <KToggleAction>

class KCharSelectBookmarkOwner : public KBookmarkOwner
{
public:
    KCharSelectBookmarkOwner(KCharSelectDia *dia)
        : d(dia)
    {
    }
    ~KCharSelectBookmarkOwner() override
    {
    }

    QString currentTitle() const override
    {
        uint ucs4 = d->charSelect->currentCodePoint();
        if (QChar::isPrint(ucs4)) {
            return QString::fromUcs4(&ucs4, 1) + QLatin1Char(' ') + formatCodePoint(ucs4);
        } else {
            return formatCodePoint(ucs4);
        }
    }

    QUrl currentUrl() const override
    {
        return QUrl(formatCodePoint(d->charSelect->currentCodePoint()));
    }

    void openBookmark(const KBookmark &bm, Qt::MouseButtons, Qt::KeyboardModifiers) override
    {
        QString c = bm.url().toString(QUrl::PreferLocalFile | QUrl::RemoveScheme);
        if (c.startsWith(QLatin1String("U+"))) {
            uint uc = c.midRef(2).toUInt(nullptr, 16);
            d->charSelect->setCurrentCodePoint(uc);
        }
    }

private:
    static QString formatCodePoint(uint ucs4)
    {
        QString c = QString::number(ucs4, 16).toUpper();
        while (c.length() < 4) {
            c.prepend(QLatin1Char('0'));
        }
        return QStringLiteral("U+") + c;
    }

private:
    KCharSelectDia *d;
};

/******************************************************************/
/* class KCharSelectDia                                           */
/******************************************************************/

//==================================================================
KCharSelectDia::KCharSelectDia(QWidget *parent)
    : KXmlGuiWindow(parent)
{
    KSharedConfig::Ptr config = KSharedConfig::openConfig();
    KConfigGroup gr = config->group("General");

    vFont = gr.readEntry("selectedFont", QFontDatabase::systemFont(QFontDatabase::GeneralFont));
    vChr = gr.readEntry("char", 33);
    _rtl = gr.readEntry("rtl", false);

    QWidget *mainWidget = new QWidget(this);
    setCentralWidget(mainWidget);

    grid = new QGridLayout(mainWidget);

    // Add character selection widget from library kdeui
    charSelect = new KCharSelect(mainWidget, actionCollection());
    charSelect->setAllPlanesEnabled(true);
    charSelect->setCurrentCodePoint(vChr);
    charSelect->setCurrentFont(vFont);
    charSelect->resize(charSelect->sizeHint());
    connect(charSelect, &KCharSelect::currentCodePointChanged, this, &KCharSelectDia::charChanged);
    connect(charSelect, SIGNAL(codePointSelected(uint)), SLOT(add(uint)));

    connect(charSelect, &KCharSelect::currentFontChanged, this, &KCharSelectDia::fontSelected);
    grid->addWidget(charSelect, 0, 0, 1, 4);

    // Build line editor
    lined = new QLineEdit(mainWidget);
    lined->resize(lined->sizeHint());
    lined->setClearButtonEnabled(true);

    lined->setFont(vFont);

    connect(lined, &QLineEdit::textChanged, this, &KCharSelectDia::lineEditChanged);
    grid->addWidget(lined, 1, 0, 1, 3);

    bClip = new QPushButton(i18n("&To Clipboard"), mainWidget);
    bClip->setIcon(QIcon::fromTheme(QStringLiteral("edit-copy")));
    bClip->setFixedSize(bClip->sizeHint());
    connect(bClip, &QPushButton::clicked, this, &KCharSelectDia::toClip);
    grid->addWidget(bClip, 1, 3);

    // Build menu
    KStandardAction::quit(this, SLOT(close()), actionCollection());

    QAction *action = actionCollection()->addAction(QStringLiteral("copy_clip"));
    action->setText(i18n("&To Clipboard"));
    action->setIcon(QIcon::fromTheme(QStringLiteral("edit-copy")));
    connect(action, &QAction::triggered, this, &KCharSelectDia::toClip);
    actionCollection()->setDefaultShortcuts(action, KStandardShortcut::shortcut(KStandardShortcut::Copy));

    action = actionCollection()->addAction(QStringLiteral("copy_utf_8"));
    action->setText(i18n("To Clipboard &UTF-8"));
    connect(action, &QAction::triggered, this, &KCharSelectDia::toClipUTF8);
    action = actionCollection()->addAction(QStringLiteral("copy_html"));
    action->setText(i18n("To Clipboard &HTML"));
    connect(action, &QAction::triggered, this, &KCharSelectDia::toClipHTML);

    action = actionCollection()->addAction(QStringLiteral("from_clip"));
    action->setText(i18n("&From Clipboard"));
    action->setIcon(QIcon::fromTheme(QStringLiteral("edit-paste")));
    connect(action, &QAction::triggered, this, &KCharSelectDia::fromClip);
    actionCollection()->setDefaultShortcuts(action, KStandardShortcut::shortcut(KStandardShortcut::Paste));
    action = actionCollection()->addAction(QStringLiteral("from_clip_utf8"));
    action->setText(i18n("From Clipboard UTF-8"));
    connect(action, &QAction::triggered, this, &KCharSelectDia::fromClipUTF8);

    i18n("From Clipboard HTML"); // Intended for future use

    action = actionCollection()->addAction(QStringLiteral("flip"));
    action->setText(i18n("&Flip Text"));
    connect(action, &QAction::triggered, this, &KCharSelectDia::flipText);

    action = new KToggleAction(i18n("&Reverse Direction"), this);
    action->setChecked(_rtl);
    actionCollection()->addAction(QStringLiteral("rtl"), action);
    connect(action, &QAction::toggled, this, &KCharSelectDia::setRtl);

    charSelect->setFocus();

    if (_rtl)
        lined->setAlignment(Qt::AlignRight);
    else
        lined->setAlignment(Qt::AlignLeft);

    QString filename = QStandardPaths::locate(QStandardPaths::GenericDataLocation, QStringLiteral("kcharselect/bookmarks.xml"));
    if (filename.isEmpty()) {
        filename = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation) + QStringLiteral("/kcharselect");
        QDir().mkpath(filename);
        filename += QStringLiteral("/bookmarks.xml");
    }
    KBookmarkManager *manager = KBookmarkManager::managerForFile(filename, QStringLiteral("kcharselect"));

    action = actionCollection()->addAction(QStringLiteral("bookmarks"));
    action->setText(i18n("Bookmarks"));
    QMenu *bmmenu = new QMenu(this);
    action->setMenu(bmmenu);

    KBookmarkMenu *bm = new KBookmarkMenu(manager, new KCharSelectBookmarkOwner(this), bmmenu);
    actionCollection()->addActions(bmmenu->actions());

    bm->setParent(this);

    setupGUI(ToolBar | Keys | Save | Create);
}

//==================================================================
void KCharSelectDia::closeEvent(QCloseEvent *event)
{
    KSharedConfig::Ptr config = KSharedConfig::openConfig();
    KConfigGroup gr = config->group("General");

    gr.writeEntry("selectedFont", vFont);
    gr.writeEntry("char", vChr);
    gr.writeEntry("rtl", _rtl);

    KXmlGuiWindow::closeEvent(event);
}

//==================================================================
void KCharSelectDia::charChanged(uint _chr)
{
    vChr = _chr;
}

//==================================================================
void KCharSelectDia::fontSelected(const QFont &_font)
{
    lined->setFont(_font);

    vFont = _font;
}

//==================================================================
void KCharSelectDia::add(uint _chr)
{
    charChanged(_chr);

    QString str = lined->text();
    const int pos = lined->cursorPosition();
    str.insert(pos, QString::fromUcs4(&_chr, 1));
    lined->setText(str);
    lined->setCursorPosition(pos + QString::fromUcs4(&_chr, 1).size());
}

//==================================================================
void KCharSelectDia::toClip()
{
    QString str = lined->text();
    if (str.isEmpty())
        str = QString::fromUcs4(&vChr, 1);
    QClipboard *cb = QApplication::clipboard();
    cb->setText(str, QClipboard::Clipboard);
    cb->setText(str, QClipboard::Selection);
}

//==================================================================
// UTF-8 is rapidly becoming the favored 8-bit encoding for
// Unicode (iso10646-1).
//
void KCharSelectDia::toClipUTF8()
{
    QClipboard *cb = QApplication::clipboard();
    QString str = lined->text();
    if (str.isEmpty())
        str = QString::fromUcs4(&vChr, 1);
    cb->setText(QLatin1String(str.toUtf8()));
}

//==================================================================
//  Put valid HTML 4.0 into the clipboard.  Valid ISO-8859-1 Latin 1
//  characters are left undisturbed.  Everything else, including the
//  "c0 control characters" often used by Windows, are clipped
//  as a HTML entity.
//
void KCharSelectDia::toClipHTML()
{
    QClipboard *cb = QApplication::clipboard();
    QString input;
    QString html;
    QChar tempchar;
    int i = 0;

    input = lined->text();
    if (input.isEmpty())
        input = QString::fromUcs4(&vChr, 1);
    const int inputLength = input.length();
    for (i = 0; i < inputLength; ++i) {
        tempchar = input.at(i);
        if (tempchar.toLatin1() && ((tempchar.unicode() < 128) || (tempchar.unicode() >= 128 + 32))) {
            html.append(input.at(i));
        } else {
            html.append(QString::asprintf("&#x%x;", tempchar.unicode()));
        }
    }
    cb->setText(html);
}

//==================================================================
//
void KCharSelectDia::fromClip()
{
    QClipboard *cb = QApplication::clipboard();
    lined->setText(cb->text());
}

//==================================================================
// UTF-8 is rapidly becoming the favored 8-bit encoding for
// Unicode (iso10646-1).  This function is handy for decoding
// UTF-8 found in legacy applications, consoles, filenames, webpages,
// etc.
//
void KCharSelectDia::fromClipUTF8()
{
    QClipboard *cb = QApplication::clipboard();
    const QString str = cb->text();

    lined->setText(str.fromUtf8(str.toLatin1()));
}

//==================================================================
//  Reverse the text held in the line edit buffer.  This is crucial
//  for dealing with visual vs. logical representations of
//  right to left languages, and handy for working around all
//  manner of legacy character order issues.
//
void KCharSelectDia::flipText()
{
    QString input;
    QString output;
    int i;

    input = lined->text();
    const int nbLength = input.length();
    for (i = 0; i < nbLength; ++i) {
        output.prepend(input.at(i));
    }
    lined->setText(output);
}

//==================================================================
void KCharSelectDia::setRtl(bool rtl)
{
    _rtl = rtl;
    if (_rtl)
        lined->setAlignment(Qt::AlignRight);
    else
        lined->setAlignment(Qt::AlignLeft);
}

//==================================================================
void KCharSelectDia::lineEditChanged()
{
    if (_rtl) {
        if (lined->cursorPosition())
            lined->setCursorPosition(lined->cursorPosition() - 1);
    }
}
