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 /* This file is part of the KDE libraries
     Copyright (C) 2005, 2006 Ian Reinhart Geiser <geiseri@kde.org>
     Copyright (C) 2005, 2006 Matt Broadstone <mbroadst@gmail.com>
     Copyright (C) 2005, 2006 Richard J. Moore <rich@kde.org>
     Copyright (C) 2005, 2006 Erik L. Bunce <kde@bunce.us>
     Copyright (C) 2007, 2008 Sebastian Sauer <mail@dipe.org>
 
     This library 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 library 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 library; see the file COPYING.LIB.  If not, write to
     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
 */
 
 #ifndef VARIANT_BINDING_H
 #define VARIANT_BINDING_H
 
 #include <QVariant>
 
 #include <kjs/object.h>
 #include <kjs/interpreter.h>
 
 #include "static_binding.h"
 
 /**
 * A simple variant style method.
 * This will extract the QVariant, cast it to the native type and place it in "value".
 * Any data that should be returned from this method should be placed into "result";
 *
 */
 #define START_VARIANT_METHOD( METHODNAME, TYPE) \
     KJS::JSValue *METHODNAME( KJS::ExecState *exec, KJS::JSObject *self, const KJS::List &args ) \
     { \
         Q_UNUSED(exec);\
         Q_UNUSED(self);\
         Q_UNUSED(args);\
         KJS::JSValue *result = KJS::jsNull(); \
         KJSEmbed::VariantBinding *imp = KJSEmbed::extractBindingImp<KJSEmbed::VariantBinding>(exec, self ); \
         if( imp ) \
         { \
             TYPE value = imp->value<TYPE>();
 /**
 * End a variant method started by START_VARIANT_METHOD
 */
 #define END_VARIANT_METHOD \
     imp->setValue(QVariant::fromValue(value)); \
     } \
     else \
     {\
         KJS::throwError(exec, KJS::GeneralError, "We have a problem baby");\
     }\
     return result; \
     }
 
 #define KJSO_VARIANT_SIMPLE_BINDING_CTOR( NAME, JSNAME, TYPE, BASENAME ) \
     NAME::NAME(KJS::ExecState *exec, const char* typeName ) \
         : BASENAME( exec, typeName )                    \
     { \
         StaticBinding::publish( exec, this, NAME::methods() ); \
     } \
     NAME::NAME(KJS::ExecState *exec, const TYPE & value) \
         : BASENAME( exec, QVariant::fromValue(value))                          \
     { \
         StaticBinding::publish( exec, this, NAME::methods() ); \
     }
 
 namespace KJSEmbed
 {
 /**
 * QVariant based binding.  This class wraps the implementation.
 * You should never have to use this class directly instead use KJSEmbed::createVariant.
 */
 
 /**
 * QVariant bindinging implementation.
 */
 class KJSEMBED_EXPORT VariantBinding : public ProxyBinding
 {
 public:
     /**
     * Create a new binding implementation with a QVariant to wrap
     */
     VariantBinding(KJS::ExecState *exec, const QVariant &value);
     ~VariantBinding() override {}
 
     void *pointer();
 
     KJS::UString toString(KJS::ExecState *) const override;
     KJS::UString className() const override;
 
     /**
     * Return the wrapped QVariant
     */
     QVariant variant() const;
 
     /**
     * Extract the actual value from the wrapper.  This method wraps QVariant::value, so it will support
     * some aspects of casting.  If the cast fails a default value of T will be returned.
     */
     template<typename T>
     T value() const
     {
         return m_value.value<T>();
     }
     /**
     * Set the internal value of the QVariant.
     */
     void setValue(const QVariant &val);
 
     /**
     * Constructs a QGenericArgument that is used with QMetaObject::invokeMember
     */
     QGenericArgument arg(const char *type) const;
 
     static const KJS::ClassInfo info;
 
 private:
     const KJS::ClassInfo *classInfo() const override
     {
         return &info;
     }
     QVariant m_value;
 
 };
 
 /**
 * Extracts a QVariant from a KJS::JSValue if the conversion fails a QVariant::Null is returned.
 */
 QVariant KJSEMBED_EXPORT extractVariant(KJS::ExecState *exec, KJS::JSValue *value);
 
 /**
 * Extracts a value based type from a VariantBinding object.  This method calls @ref extractVariant so if
 * the conversions fails then the default value will be returned.  Care should be taken that this method
 * is not used with KJSEmbed::ObjectBinding objects because the cast will fail.
 */
 template< typename T>
 T extractVariant(KJS::ExecState *exec, KJS::JSValue *arg, const T &defaultValue)
 {
     if (!arg) {
         return defaultValue;
     } else {
         QVariant variant = extractVariant(exec, arg);
         if (!variant.isNull()) {
             if (variant.canConvert<T>()) {
                 return variant.value<T>();
             } else {
                 throwError(exec, KJS::TypeError, "Cast failed");
                 return defaultValue;
             }
         } else {
             return defaultValue;
         }
     }
 }
 
 /**
 * Extracts a value from a KJS::List of KJS::JSValues.  If the argument is out of range the default value
 * is returned.
 */
 template< typename T>
 T extractVariant(KJS::ExecState *exec, const KJS::List &args, int idx, const T &defaultValue = T())
 {
     if (args.size() >= idx) {
         return extractVariant<T>(exec, args[idx], defaultValue);
     } else {
         return defaultValue;
     }
 }
 
 /**
 * Can create any known KJSEmbed::VariantBinding object and set the value.
 * On failure a KJS::jsNull will be returned and the exception set. Only values
 * that are supported by QVariant will work.
 */
 template< typename T>
 KJS::JSValue *createVariant(KJS::ExecState *exec, const KJS::UString &className, const T &value)
 {
     KJS::JSObject *parent;
     parent = exec->dynamicInterpreter()->globalObject();
     KJS::JSObject *returnValue = StaticConstructor::construct(exec, parent, className);
     if (returnValue) {
         // If it is a value type setValue
         KJSEmbed::VariantBinding *imp = extractBindingImp<KJSEmbed::VariantBinding>(exec, returnValue);
         if (imp) {
             imp->setValue(QVariant::fromValue(value));
         } else {
             throwError(exec, KJS::TypeError, toUString(QString("Created failed to cast to %1 failed").arg(toQString(className))));
             return KJS::jsNull();
         }
     } else {
         throwError(exec, KJS::TypeError, toUString(QString("Could not construct a %1").arg(toQString(className))));
         return KJS::jsNull();
     }
     return returnValue;
 }
 
 /**
 * Convert a KJS::JSValue that contains an associative array into a QMap.  If you call
 * this on a normal Javascript object you will get each property as the key and its
 * data as the value.  A normal array will give you a QMap with each key being the
 * index.
 */
 QMap<QString, QVariant> KJSEMBED_EXPORT convertArrayToMap(KJS::ExecState *exec, KJS::JSValue *value);
 
 /**
 * Convert a KJS::JSValue into a QList.  If the list contains only strings, or objects that can be
 * converted to strings you can call to @ref convertArrayToStringList.  If you call this on an
 * associative array or a javascript object the list will return empty.  Unless there happens to be
 * a property with a numeric index present, then all bets are off.
 */
 QList<QVariant> KJSEMBED_EXPORT convertArrayToList(KJS::ExecState *exec, KJS::JSValue *value);
 
 /**
 * Convert a KJS::JSValue into a QStringList. @see convertArrayToList.
 */
 QStringList KJSEMBED_EXPORT convertArrayToStringList(KJS::ExecState *exec, KJS::JSValue *value);
 
 /**
 * Convert a KJS::JSValue into a QVariant object
 */
 QVariant KJSEMBED_EXPORT convertToVariant(KJS::ExecState *exec, KJS::JSValue *value);
 
 /**
 * Convert a QVariant to a KJS::JSValue.  If the type is a known type the bindings will be added.
 * If the type is supported by QVariant, but is not supported by KJSEmbed then it will just be wrapped.
 * This wrapped value can be used just like normal value bindings, save for the lack of methods available to the object.
 */
 KJSEMBED_EXPORT KJS::JSValue *convertToValue(KJS::ExecState *exec, const QVariant &value);
 
 /**
 * The Bindings for the KJSEmbed::VariantBinding
 */
 struct Method;
 class KJSEMBED_EXPORT VariantFactory
 {
 public:
     static const Method VariantMethods[];
     static const Method *methods()
     {
         return VariantMethods;
     }
 };
 
 }
 #endif