/***************************************************************************
                          MenuNode.h  -  generic menu node type
                             -------------------
    begin                : Mon Jan 10 2000
    copyright            : (C) 2000 by Thomas Eschenbacher
    email                : Thomas.Eschenbacher@gmx.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef MENU_NODE_H
#define MENU_NODE_H

#include "config.h"

#include <QHash>
#include <QIcon>
#include <QKeySequence>
#include <QObject>
#include <QPixmap>
#include <QString>
#include <QStringList>

#include "libgui/MenuGroup.h"

class QAction;

namespace Kwave
{

    class MenuSub;

    /**
     * Base class for the MenuItem, MenuSub and the MenuRoot class.
     */
    class MenuNode: public QObject
    {
        Q_OBJECT

    public:

        /**
         * Constructor.
         * @param parent pointer to the node's parent (might be 0)
         * @param name the non-localized name of the node
         * @param command the command to be sent when the node is
         *                selected (optional, default=0)
         * @param shortcut keyboard shortcut (optional, default=0)
         * @param uid unique id string (optional, default=0)
         */
        MenuNode(Kwave::MenuNode *parent,
                 const QString &name,
                 const QString &command,
                 const QKeySequence &shortcut,
                 const QString &uid);

        /**
         * Destructor. Clears the menu node and cleans up.
         * @see #clear()
         */
        ~MenuNode() override;

        /** Returns the path of this menu entry */
        const QString path() const;

        /** Returns the (non-localized) name of the node. */
        inline const QString &name() const { return m_name; }

        /** Returns the command of the node. */
        inline const QString &command() const { return m_command; }

        /** Returns the corresponding menu action */
        virtual QAction *action() { return nullptr; }

        /**
         * Returns the unique id string of the node.
         */
        inline const QString &uid() const { return m_uid; }

        /**
         * Sets the unique id string of the node
         */
        void setUID(const QString &uid);

        /**
         * Returns the bitmask of the keyboard shortcut.
         */
        inline const QKeySequence &shortcut() const { return m_shortcut; }

        /**
         * Sets the bitmask of the keyboard shortcut.
         */
        virtual void setShortcut(const QKeySequence &shortcut) {
            m_shortcut = shortcut;
        }

        /**
         * Returns the menu nodes' icon.
         */
        virtual const QIcon icon();

        /**
         * Sets a new icon of a menu node.
         * @param icon QIcon with the icon
         */
        virtual void setIcon(const QIcon &icon);

        /**
         * Returns true if the node is a branch, false if it is a leaf.
         * (overwritten in MenuSub etc.)
         */
        virtual bool isBranch() const { return false; }

        /**
         * Removes all child entries from the menu node (gui) and
         * deletes the MenuNode objects (memory).
         */
        virtual void clear();

        /** returns a pointer to the menu's parent node */
        virtual Kwave::MenuNode *parentNode() const;

        /**
         * Shows/hides the current menu node.
         * @param visible true to show the item, false to hide
         */
        virtual void setVisible(bool visible);

        /**
         * Returns true if the node is enabled.
         */
        virtual bool isEnabled();

        /**
         * Enables/disables the current menu node.
         * @param enable true to enable the item, false to disable
         */
        virtual void setEnabled(bool enable);

        /**
         * Sets/removes the checkmark from the current menu node.
         * @param check true to set the mark, false to remove
         */
        virtual void setChecked(bool check);

        /**
         * Sets the visible text of an item to a new value. (Only useful
         * for a MenuItem)
         * @param text the new text
         */
        virtual void setText(const QString &text);

        /**
         * Tries to find a menu node by it's unique id string. It descends
         * recursively through all child nodes if necessary.
         * @param uid the unique id string to be searched
         * @return pointer to the found node or 0 if not found
         */
        Kwave::MenuNode *findUID(const QString &uid);

        /**
         * Tries to find a child node by it's name.
         * @param name non-localized name of the child node
         * @return pointer to the found node or 0 if not found
         */
        Kwave::MenuNode *findChild(const QString &name);

        /**
         * Removes a child node of the current node. If the child
         * was not found or is already removed this does nothing.
         * @param child pointer to the child node
         */
        virtual void removeChild(Kwave::MenuNode *child);

        /**
         * Inserts a new branch node into the menu structure. The new node
         * normally is (derived from) MenuSub.
         * @param name non-localized name of the node
         * @param command the command template used for creating commands of
         *                submenus (leafes) that don't have an own command
         *                but contain data for their parent's command.
         *                Should contain a %s that will be replaced by some
         *                data from a child entry. (this is used for
         *                menus with data selection lists like "recent files)
         *                If not used, pass 0.
         * @param shortcut keyboard shortcut, 0 if unused
         * @param uid unique id string (might be 0)
         * @return pointer to the new branch node
         */
        virtual Kwave::MenuSub *insertBranch(const QString &name,
                                             const QString &command,
                                             const QKeySequence &shortcut,
                                             const QString &uid);

        /**
         * Inserts a new leaf node into the menu structure. The new node
         * normally is (derived from) MenuItem.
         * @param name non-localized name of the node
         * @param command the command to be sent when the node is
         *                selected (might be 0)
         * @param shortcut keyboard shortcut, 0 if unused
         * @param uid unique id string (might be 0)
         * @return pointer to the new leaf node
         */
        virtual Kwave::MenuNode *insertLeaf(const QString &name,
                                            const QString &command,
                                            const QKeySequence &shortcut,
                                            const QString &uid);

        /**
         * Registers a node as a child of the current node.
         * @param node pointer to the child node
         * @param before the node before which the node should be inserted
         *               (optional, can be null for "append")
         */
        virtual void insertChild(Kwave::MenuNode *node,
                                 Kwave::MenuNode *before);

        /**
         * Inserts a new child node into the structure. If the specified
         * position contains a path that doesn't completely exist, all
         * missing branches will be appended.
         * @param name non-localized name of the first node (might be 0)
         * @param position path consisting of several node names separated
         *        by a '/'. All strings are non-localized.
         * @param command the command to be sent when the node is
         *                selected (might be 0)
         * @param shortcut keyboard shortcut, 0 if unused
         * @param uid unique id string (might be 0)
         */
        virtual void insertNode(const QString &name,
                                const QString &position,
                                const QString &command,
                                const QKeySequence &shortcut,
                                const QString &uid);

        /**
         * Converts a child node from leaf to branch type by removing
         * the leaf and inserting a branch with the same properties
         * instead.
         * @param node the child node to be converted
         * @return pointer to the new branch node
         */
        virtual Kwave::MenuNode *leafToBranch(Kwave::MenuNode *node);

        /**
         * Handles/interprets special menu commands.
         * @param command name of a menu node or command
         * @return true if the name was recognized as a command and handled
         */
        virtual bool specialCommand(const QString &command);

        /**
         * Called to notify the node that it has been selected.
         */
        virtual void actionSelected();

        /**
         * Returns a reference to the list of groups. It recursively calls
         * all parent node's groupList() function until it reaches the
         * root node of the menu structure that holds the list of groups and
         * overwrites this function.
         * @return reference to the list of groups
         */
        virtual QHash<QString, Kwave::MenuGroup *> &groupList();

        /**
         * Adds the node to a group. If it is already a member of the
         * group this function will do nothing.
         * @param group name of the group
         * @param mode the mode of the group (normal or exclusive)
         */
        void joinGroup(const QString &group, Kwave::MenuGroup::Mode mode);

        /**
         * Removes the node from a group (opposite of joinGroup).
         * @param group name of the group
         */
        void leaveGroup(const QString &group);

    protected:

        /**
         * Returns the address of the root node of the menu structure.
         */
        Kwave::MenuNode *rootNode();

        /**
         * Emits a command if the node is the root node. If it is a client
         * node it will call the root node's emitCommand() function.
         * @see #emitCommand()
         * @see #rootNode()
         */
        void emitCommand(const QString &command);

    signals:
        /**
         * Will be emitted if the command of the menu node
         * should be executed. It will only be emitted by the
         * root node, client nodes call the root node's emitCommand()
         * function.
         * @see #emitCommand()
         * @see #rootNode()
         */
        void sigCommand(const QString &command);

    protected:

        /** list with pointers to child menus */
        QList<Kwave::MenuNode *> m_children;

        /** list of group names the item belongs to */
        QStringList m_groups;

    private:

        /** unique id string */
        QString m_uid;

        /** bitmask of the keyboard shortcut */
        QKeySequence m_shortcut;

        /** name of the node (non-localized) */
        QString m_name;

        /** command to be sent when the node is activated (optional) */
        QString m_command;

        /** parent of this entry */
        Kwave::MenuNode *m_parentNode;

    };
}

#endif // _MENU_NODE_H_

//***************************************************************************
//***************************************************************************
