// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "qqstylekit_p.h"
#include "qqstylekitstyle_p.h"
#include "qqstylekittheme_p.h"
#include "qqstylekitreader_p.h"

#include <QtGui/QStyleHints>

QT_BEGIN_NAMESPACE

QPointer<QQStyleKitAttached> QQStyleKitAttached::s_instance;
bool QQStyleKitAttached::s_transitionsEnabled = true;

QQStyleKit::QQStyleKit(QObject *parent)
    : QObject(parent)
{
}

QQStyleKitAttached *QQStyleKit::qmlAttachedProperties(QObject *obj)
{
    /* QQStyleKitAttached is a singleton. It doesn't matter where it's
     * used from in the application, it will always represent the same
     * application global style and theme. */
    if (!QQStyleKitAttached::s_instance)
        QQStyleKitAttached::s_instance = new QQStyleKitAttached(QGuiApplication::instance());
    if (!QQStyleKitAttached::s_instance->m_engine && obj)
        QQStyleKitAttached::s_instance->m_engine = qmlEngine(obj);
    return QQStyleKitAttached::s_instance.get();
}

QQStyleKitAttached::QQStyleKitAttached(QObject *parent)
    : QObject(parent)
{
    connect(QGuiApplication::styleHints(), &QStyleHints::colorSchemeChanged, this, [this](){
        if (m_style)
            m_style->recreateTheme();
    });
}

QQStyleKitAttached::~QQStyleKitAttached()
{
    QQStyleKitAttached::s_instance = nullptr;
    if (m_ownsStyle) {
        delete m_style;
        m_style = nullptr;
    }
}

QQStyleKitStyle *QQStyleKitAttached::style() const
{
    return m_style;
}

void QQStyleKitAttached::setStyle(QQStyleKitStyle *style)
{
    if (m_style == style)
        return;

    if (m_ownsStyle)
        m_style->deleteLater();

    m_style = style;

    if (m_style && m_style->m_theme)
        m_style->m_theme->updateQuickTheme();
    if (m_style->loaded())
        QQStyleKitReader::resetAll();

    emit styleChanged();
}

QString QQStyleKitAttached::styleUrl() const
{
    return m_styleUrl;
}

void QQStyleKitAttached::setStyleUrl(const QString &styleUrl)
{
    if (m_styleUrl == styleUrl)
        return;

    m_styleUrl = styleUrl;

    Q_ASSERT(m_engine);
    QQmlComponent comp(m_engine, QUrl(styleUrl), this);
    if (!comp.errors().isEmpty()) {
        qmlWarning(this) << "Could not create a StyleKit style: " << comp.errorString();
        return;
    }
    auto *style = qobject_cast<QQStyleKitStyle *>(comp.create());
    if (!style) {
        qmlWarning(this) << "Could not create a StyleKit style from url: " << styleUrl;
        return;
    }

    style->componentComplete();
    setStyle(style);
    m_ownsStyle = true;
    emit styleUrlChanged();
}

bool QQStyleKitAttached::transitionsEnabled() const
{
    return s_transitionsEnabled;
}

void QQStyleKitAttached::setTransitionsEnabled(bool enabled)
{
    if (enabled == s_transitionsEnabled)
        return;

    s_transitionsEnabled = enabled;
    emit transitionsEnabledChanged();
}

QQStyleKitDebug *QQStyleKitAttached::debug() const
{
    return &const_cast<QQStyleKitAttached *>(this)->m_debug;
}

bool QQStyleKitAttached::styleLoaded() const
{
    return m_style && m_style->loaded();
}

QT_END_NAMESPACE

#include "moc_qqstylekit_p.cpp"