/***************************************************************************
 * manager.h
 * This file is part of the KDE project
 * copyright (C)2004-2007 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.
 ***************************************************************************/

#ifndef KROSS_MANAGER_H
#define KROSS_MANAGER_H

#include <QtCore/QStringList>
#include <QtCore/QMap>
#include <QtCore/QObject>
#include <QtCore/QUrl>
#include <QtScript/QScriptable>

#include "krossconfig.h"
#include "childreninterface.h"
#include "metatype.h"

namespace Kross
{

// Forward declarations.
class Interpreter;
class Action;
class ActionCollection;
class InterpreterInfo;

/**
 * The Manager class is a singleton that provides the main entry
 * point to deal with the Kross Scripting Framework.
 *
 * Use \a Interpreter to just work with some implementated
 * interpreter like python or ruby. While \a Action implements
 * a flexible abstract container to deal with single script files.
 */
class KROSSCORE_EXPORT Manager
    : public QObject
    , public QScriptable
    , public ChildrenInterface
{
    Q_OBJECT

public:

    /**
     * Return the Manager instance. Always use this
     * function to access the Manager singleton.
     */
    static Manager &self();

    /**
     * \return a map with \a InterpreterInfo* instances
     * used to describe interpreters.
     */
    QHash<QString, InterpreterInfo *> interpreterInfos() const;

    /**
     * \return true if there exists an interpreter with the
     * name \p interpretername else false.
     */
    bool hasInterpreterInfo(const QString &interpretername) const;

    /**
     * \return the \a InterpreterInfo* matching to the defined
     * \p interpretername or NULL if there does not exists such
     * a interpreter.
     */
    InterpreterInfo *interpreterInfo(const QString &interpretername) const;

    /**
     * Return the name of the \a Interpreter that feels responsible
     * for the defined \p file .
     *
     * \param file The filename we should try to determinate the
     * interpretername for.
     * \return The name of the \a Interpreter which will be used
     * to execute the file or QString() if we failed to determinate
     * a matching interpreter for the file.
     */
    const QString interpreternameForFile(const QString &file);

    /**
     * Return the \a Interpreter instance defined by
     * the interpretername.
     *
     * \param interpretername The name of the interpreter.
     * e.g. "python" or "ruby".
     * \return The Interpreter instance or NULL if there does not exists
     * an interpreter with such an interpretername.
     */
    Interpreter *interpreter(const QString &interpretername) const;

    /**
     * \return the root \a ActionCollection instance. Each collection
     * could have children of other collections and/or
     * \a Action instances.
     */
    ActionCollection *actionCollection() const;

    /**
     * \return the \a MetaTypeHandler instance for custom types
     * of type \p typeName .
     *
     * \since 4.2
     */
    MetaTypeHandler *metaTypeHandler(const QByteArray &typeName) const;

    /**
     * Register a handler for custom types.
     *
     * See also the \a WrapperInterface class.
     *
     * \param typeName The custom type the handler should handle.
     * \param handler Function that should be called to handle
     * a custom type.
     *
     * \since 4.2
     */
    void registerMetaTypeHandler(const QByteArray &typeName, MetaTypeHandler::FunctionPtr *handler);

    /**
     * Register a handler for custom types.
     *
     * See also the \a WrapperInterface class.
     *
     * \param typeName The custom type the handler should handle.
     * \param handler Function that should be called to handle
     * a custom type.
     *
     * \since 4.2
     */
    void registerMetaTypeHandler(const QByteArray &typeName, MetaTypeHandler::FunctionPtr2 *handler);

    /**
     * Register a handler for custom types.
     *
     * See also the \a WrapperInterface class.
     *
     * \param typeName The custom type the handler should handle.
     * \param handler Function that should be called to handle
     * a custom type.
     *
     * \since 4.2
     */
    void registerMetaTypeHandler(const QByteArray &typeName, MetaTypeHandler *handler);

    /**
     * Returns true if strict type handling is enabled.
     *
     * \since 4.2
     */
    bool strictTypesEnabled() const;

    /**
     * Enable more strict type handling. If enabled then scripting-backends don't
     * handle unknown pointer-types where no MetaTypeHandler was registered for.
     * If disabled, such unknown types will be reinterpret_cast to QObject* what
     * allows to also handle unknown QObject's but will also result in a crash
     * if the unknown type isn't a QObject. Per default strict type handling is
     * enabled.
     *
     * \since 4.2
     */
    void setStrictTypesEnabled(bool enabled);

    /**
    * \return whether \p typeName has a handler assigned or not.
    */
    bool hasHandlerAssigned(const QByteArray &typeName) const;
public Q_SLOTS:

    /**
     * \return a list of names of all supported scripting interpreters.
     * The list may contain for example "python" and "ruby" depending
     * on what interpreter-plugins are installed.
     */
    QStringList interpreters() const;

    /**
    * \return true if there exists a \a Action QObject instance
    * which is child of this \a Manager instance and is defined as \p name
    * else false is returned.
    */
    bool hasAction(const QString &name);

    /**
    * \return the \a Action QObject instance defined with \p name which is
    * child of this \a Manager instance. If there exists no such \a Action
    * yet, create one.
    */
    QObject *action(const QString &name);

    /**
     * Load and return an external module. Modules are dynamic loadable
     * plugins which could be loaded on demand to provide additional
     * functionality.
     *
     * \param modulename The name of the module we should try to load.
     * \return The QObject instance that repesents the module or NULL
     * if loading failed.
     */
    QObject *module(const QString &modulename);

    /**
     * External modules are dynamically loadable and are normally deleted
     * when the kross library is unloaded.
     * Applications may choose to call deleteModules() instead to control
     * deletion of the modules at another time.
     */
    void deleteModules();

    /**
    * Execute a script file.
    * \param file The script file that should be executed.
    */
    bool executeScriptFile(const QUrl &file = QUrl());

    void addQObject(QObject *obj, const QString &name = QString());
    QObject *qobject(const QString &name) const;
    QStringList qobjectNames() const;

Q_SIGNALS:

    /**
     * This signal is emitted when the execution of a script is started.
     */
    void started(Kross::Action *);

    /**
     * This signal is emitted when the execution of a script is finished.
     */
    void finished(Kross::Action *);

private:
    /// \internal d-pointer class.
    class Private;
    /// \internal d-pointer instance.
    Private *const d;

public:

    /**
     * The constructor. Use \a self() to access the Manager
     * singleton instance and don't call this direct.
     */
    explicit Manager();

    /**
     * Destructor.
     */
    virtual ~Manager();
};

}

#endif

