/***************************************************************************
 * plugin.cpp
 * This file is part of the KDE project
 * copyright (C)2007 by Sebastian Sauer (mail@dipe.org)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 * You should have received a copy of the GNU Library General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 ***************************************************************************/

#include "plugin.h"
#include "kross_qts_plugin_debug.h"

#include "../core/manager.h"
#include "../core/object.h"

#include <QByteArray>
#include <QUrl>
#include <QColor>
#include <QRect>
#include <QPoint>
#include <QSize>
#include <QWidget>
#include <QLayout>
#include <QVBoxLayout>
#include <QtUiTools/QUiLoader>
#include <QAbstractItemView>
#include <QAbstractItemModel>
#include <QStringListModel>
#include <QScriptClass>
#include <QScriptContext>
#include <QScriptValueIterator>
#include <QDebug>

#include <klocalizedstring.h>

using namespace Kross;

namespace Kross
{

/**
* The EcmaObject implements QScriptClass and Kross::Object to provide
* custom behavior to QtScript objects.
*/
class EcmaObject : public QScriptClass, public Kross::Object
{
public:
    explicit EcmaObject(QScriptEngine *engine, const QScriptValue &object = QScriptValue())
        : QScriptClass(engine), Kross::Object(), m_object(object) {}
    virtual ~EcmaObject() {}
    QString name() const override
    {
        return "KrossObject";
    }
    QScriptValue prototype() const override
    {
        return m_object;
    }

    QVariant callMethod(const QString &name, const QVariantList &args = QVariantList()) override
    {
        QScriptValue function = m_object.property(name);
        if (! function.isFunction()) {
            qCWarning(KROSS_QTS_PLUGIN_LOG) << "EcmaScript::callFunction No such function " << name;
            if (QScriptContext *context = engine()->currentContext()) {
                context->throwError(QScriptContext::ReferenceError, i18n("No such function \"%1\"", name));
            }
            return QVariant();
        }
        QScriptValueList arguments;
        foreach (const QVariant &v, args) {
            arguments << engine()->toScriptValue(v);
        }
        QScriptValue result = function.call(m_object, arguments);
        return result.toVariant();
    }

    QStringList methodNames() override
    {
        QStringList methods;
        QScriptValueIterator it(m_object);
        while (it.hasNext()) {
            it.next();
            if (it.value().isFunction()) {
                methods << it.name();
            }
        }
        return methods;
    }

private:
    QScriptValue m_object;
};

QScriptValue toByteArray(QScriptEngine *e, const QByteArray &ba)
{
    return ba.isNull() ? e->nullValue() : e->newVariant(ba);
}
void fromByteArray(const QScriptValue &v, QByteArray &ba)
{
    ba = v.isNull() ? QByteArray() : v.toString().toUtf8();
}

QScriptValue toUrl(QScriptEngine *e, const QUrl &url)
{
    return e->newVariant(url.toString());
}
void fromUrl(const QScriptValue &v, QUrl &url)
{
    url.setUrl(v.toString());
}

QScriptValue toColor(QScriptEngine *e, const QColor &c)
{
    return c.isValid() ? e->newVariant(c.name()) : e->nullValue();
}
void fromColor(const QScriptValue &v, QColor &c)
{
    c.setNamedColor(v.isNull() ? QString() : v.toString());
}

QScriptValue toRect(QScriptEngine *e, const QRect &r)
{
    return e->toScriptValue(QVariantList() << r.x() << r.y() << r.width() << r.height());
}
void fromRect(const QScriptValue &v, QRect &r)
{
    r = v.isArray() ? QRect(v.property(0).toInt32(), v.property(1).toInt32(), v.property(2).toInt32(), v.property(3).toInt32()) : QRect();
}
QScriptValue toRectF(QScriptEngine *e, const QRectF &r)
{
    return e->toScriptValue(QVariantList() << r.x() << r.y() << r.width() << r.height());
}
void fromRectF(const QScriptValue &v, QRectF &r)
{
    r = v.isArray() ? QRectF(v.property(0).toNumber(), v.property(1).toNumber(), v.property(2).toNumber(), v.property(3).toNumber()) : QRectF();
}

QScriptValue toPoint(QScriptEngine *e, const QPoint &p)
{
    return e->toScriptValue(QVariantList() << p.x() << p.y());
}
void fromPoint(const QScriptValue &v, QPoint &p)
{
    p = v.isArray() ? QPoint(v.property(0).toInt32(), v.property(1).toInt32()) : QPoint();
}
QScriptValue toPointF(QScriptEngine *e, const QPointF &p)
{
    return e->toScriptValue(QVariantList() << p.x() << p.y());
}
void fromPointF(const QScriptValue &v, QPointF &p)
{
    p = v.isArray() ? QPointF(v.property(0).toNumber(), v.property(1).toNumber()) : QPointF();
}

QScriptValue toSize(QScriptEngine *e, const QSize &s)
{
    return e->toScriptValue(QVariantList() << s.width() << s.height());
}
void fromSize(const QScriptValue &v, QSize &s)
{
    s = v.isArray() ? QSize(v.property(0).toInt32(), v.property(1).toInt32()) : QSize();
}
QScriptValue toSizeF(QScriptEngine *e, const QSizeF &s)
{
    return e->toScriptValue(QVariantList() << s.width() << s.height());
}
void fromSizeF(const QScriptValue &v, QSizeF &s)
{
    s = v.isArray() ? QSizeF(v.property(0).toNumber(), v.property(1).toNumber()) : QSizeF();
}

/*
QScriptValue toVariantList(QScriptEngine *e, const QVariantList &l) {
    const int len = l.size();
    QScriptValue a = e->newArray(len);
    for(int i = 0; i < len; ++i)
        a.setProperty(i, e->toScriptValue(l[i]));
    return a;
}
void fromVariantList(const QScriptValue &v, QVariantList &l) {
    l.clear();
    const int len = v.isArray() ? v.property("length").toInt32() : 0;
    for(int i = 0; i < len; ++i)
        l << v.property(i).toVariant();
}
*/

QScriptValue toObjPtr(QScriptEngine *e, const Kross::Object::Ptr &ptr)
{
    const EcmaObject *obj = dynamic_cast<const EcmaObject *>(ptr.data());
    return obj ? obj->prototype() : e->nullValue();
}
void fromObjPtr(const QScriptValue &v, Kross::Object::Ptr &ptr)
{
    ptr = new EcmaObject(v.engine(), v);
}

QScriptValue createWidget(QScriptContext *context, QScriptEngine *engine)
{
    const QString widgetname = context->callee().prototype().property("className").toString();
    Q_ASSERT(! widgetname.isEmpty());
    QWidget *parent = qscriptvalue_cast<QWidget *>(context->argument(0));
    QUiLoader loader;
    QWidget *widget = loader.createWidget(widgetname, parent);
    if (! widget) {
        return context->throwError(QScriptContext::TypeError, QString("No such QWidget \"%1\"").arg(widgetname));
    }
    if (parent && parent->layout()) {
        parent->layout()->addWidget(widget);
    }
    QScriptEngine::ValueOwnership owner = parent ? QScriptEngine::QtOwnership : QScriptEngine::ScriptOwnership;
    QScriptValue result = engine->newQObject(widget, owner);
    //result.setPrototype(context->callee().prototype());
    return result;
}

QScriptValue addWidgetLayout(QScriptContext *c, QScriptEngine *engine)
{
    if (QLayout *layout = dynamic_cast<QLayout *>(qscriptvalue_cast<QObject *>(c->thisObject()))) {
        QGridLayout *gridLayout = dynamic_cast<QGridLayout *>(layout);
        QObject *obj = qscriptvalue_cast<QObject *>(c->argument(0));
        if (QWidget *w = dynamic_cast<QWidget *>(obj)) {
            if (gridLayout) {
                gridLayout->addWidget(w, c->argument(1).toInt32(), c->argument(2).toInt32(), (Qt::Alignment)c->argument(3).toInt32());
            } else {
                layout->addWidget(w);
            }
        } else if (QLayout *l = dynamic_cast<QLayout *>(qscriptvalue_cast<QObject *>(c->argument(0)))) {
            if (gridLayout) {
                gridLayout->addLayout(l, c->argument(1).toInt32(), c->argument(2).toInt32(), (Qt::Alignment)c->argument(3).toInt32());
            } else if (QBoxLayout *bl = dynamic_cast<QBoxLayout *>(layout)) {
                bl->addLayout(l);
            }
        }
    }
    return engine->nullValue();
}
QScriptValue createLayout(QScriptContext *context, QScriptEngine *engine, QLayout *layout)
{
    QObject *parent = qscriptvalue_cast<QObject *>(context->argument(0));
    if (QWidget *parentWidget = dynamic_cast<QWidget *>(parent)) {
        parentWidget->setLayout(layout);
    } else if (QBoxLayout *parentLayout = dynamic_cast<QBoxLayout *>(parent)) {
        parentLayout->addLayout(layout);
    }
    QScriptValue obj = engine->newQObject(layout);
    obj.setProperty("addWidget", engine->newFunction(addWidgetLayout));
    obj.setProperty("addLayout", engine->newFunction(addWidgetLayout));
    return obj;
}
QScriptValue createVBoxLayout(QScriptContext *context, QScriptEngine *engine)
{
    return createLayout(context, engine, new QVBoxLayout());
}
QScriptValue createHBoxLayout(QScriptContext *context, QScriptEngine *engine)
{
    return createLayout(context, engine, new QHBoxLayout());
}
QScriptValue createGridLayout(QScriptContext *context, QScriptEngine *engine)
{
    return createLayout(context, engine, new QGridLayout());
}
QScriptValue includeFunction(QScriptContext *context, QScriptEngine *engine)
{
    if (context->argumentCount() < 1) {
        return engine->nullValue();
    }
    return engine->importExtension(context->argument(0).toString());
}

/**
* Initialize some core functionality like common used types we like
* to use within scripts.
*/
void initializeCore(QScriptEngine *engine)
{
    QScriptValue global = engine->globalObject();

    // compatibility to kjs/kjsembed
    if (! global.property("println").isValid()) {
        global.setProperty("println", global.property("print"));
    }

    // register common used types
    qScriptRegisterMetaType< QByteArray         >(engine, toByteArray,   fromByteArray);
    qScriptRegisterMetaType< QUrl               >(engine, toUrl,         fromUrl);
    qScriptRegisterMetaType< QColor             >(engine, toColor,       fromColor);
    qScriptRegisterMetaType< QRect              >(engine, toRect,        fromRect);
    qScriptRegisterMetaType< QRectF             >(engine, toRectF,       fromRectF);
    qScriptRegisterMetaType< QPoint             >(engine, toPoint,       fromPoint);
    qScriptRegisterMetaType< QPointF            >(engine, toPointF,      fromPointF);
    qScriptRegisterMetaType< QSize              >(engine, toSize,        fromSize);
    qScriptRegisterMetaType< QSizeF             >(engine, toSizeF,       fromSizeF);

    // we should probably go with an own wrapper for QVariant/QObject...
    //qScriptRegisterMetaType< QVariant           >(engine, toVariant,     fromVariant);
    //qScriptRegisterMetaType< QVariantList       >(engine, toVariantList, fromVariantList);

    // register the Kross::Object::Ptr wrapper
    qScriptRegisterMetaType< Kross::Object::Ptr >(engine, toObjPtr,      fromObjPtr);

    // register the include function that allows to importExtension
    global.setProperty("include", engine->newFunction(includeFunction));
}

/**
* Initialize GUI functionality like widgets the QUiLoader provides
* and some layout-managers.
*/
void initializeGui(QScriptEngine *engine)
{
    QScriptValue global = engine->globalObject();

    // register UI widgets
    QUiLoader loader;
    foreach (const QString &widgetname, loader.availableWidgets()) {
        QScriptValue proto = engine->newObject();
        proto.setProperty("className", QScriptValue(engine, widgetname));
        QScriptValue func = engine->newFunction(createWidget);
        func.setPrototype(proto);
        global.setProperty(widgetname, func);
    }

    // register layouts
    global.setProperty("QVBoxLayout", engine->newFunction(createVBoxLayout));
    global.setProperty("QHBoxLayout", engine->newFunction(createHBoxLayout));
    global.setProperty("QGridLayout", engine->newFunction(createGridLayout));
}

}
