/*
 * This file is part of KDevelop
 *
 * Copyright 2007 David Nolden <david.nolden.kdevelop@art-master.de>
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
#ifndef QUICKOPENDATAPROVIDER_H
#define QUICKOPENDATAPROVIDER_H

#include <QtCore/QList>
#include <QtCore/QObject>
#include <QtCore/QSet>
#include <KDE/KUrl>

#include <ksharedptr.h>
#include "../languageexport.h"

class QString;
class QStringList;
class QIcon;

namespace KDevelop {

class IndexedString;

/**
 * Hint: When implementing a data-provider, do not forget to export it! Else it won't work.
 * */

/**
 * If your plugin manages a list of files, you can use this to return that list.
 * The file-list can be queried by other data-providers(for example functions/methods) so they
 * can manipulate their content based on those file-lists. The file-list should not be filtered at all,
 * it should only depend on the enabled models/items
 *
 * Example: A list of files in the include-path, a list of files in the project, etc.
 * */
class KDEVPLATFORMLANGUAGE_EXPORT QuickOpenFileSetInterface {
  public:
    virtual QSet<IndexedString> files() const = 0;
    virtual ~QuickOpenFileSetInterface();
};
/**
 * You can use this as additional base-class for your embedded widgets to get additional interaction
 * */
class KDEVPLATFORMLANGUAGE_EXPORT QuickOpenEmbeddedWidgetInterface {
  public:
    virtual ~QuickOpenEmbeddedWidgetInterface();
    ///Is called when the keyboard-shortcut "next" is triggered on the widget, which currently is SHIFT+Right
    virtual void next() = 0;
    ///Is called when the keyboard-shortcut "previous" is triggered on the widget, which currently is SHIFT+Left
    virtual void previous() = 0;
    ///Is called when the keyboard-shortcut "accept" is triggered on the widget, which currently is SHIFT+Return
    virtual void accept() = 0;
    ///Is called when the keyboard-shortcut "scroll up" is triggered on the widget, which currently is SHIFT+Up
    virtual void up() = 0;
    ///Is called when the keyboard-shortcut "scroll down" is triggered on the widget, which currently is SHIFT+Down
    virtual void down() = 0;
};

/**
 * Reimplement this to represent single entries within the quickopen list.
 * */
class KDEVPLATFORMLANGUAGE_EXPORT QuickOpenDataBase : public KShared {
  public:
    virtual ~QuickOpenDataBase();

    ///Return the text to be shown in the list for this item
    virtual QString text() const = 0;

    virtual QString htmlDescription() const = 0;

    /**Can return Custom highlighting triplets as explained in
     * the kde header ktexteditor/codecompletionmodel.h
     * The default-implementation returns an empty list, which means no
     * special highlighting will be applied.
     * */
    virtual QList<QVariant> highlighting() const;

    /**
     * May return an icon to mark the item in the quickopen-list.
     * The standard-implementation returns an invalid item, which means that
     * no icon will be shown.
     * */
    virtual QIcon icon() const;

    /**
     * Is called when the item should be executed.
     *
     * @param filterText Current content of the quickopen-dialogs filter line-edit.
     *                   If this is changed, and false is returned, the content of the
     *                   line-edit will be changed according to the new text.
     * @return Whether the dialog should be closed.
     * */
    virtual bool execute( QString& filterText ) = 0;

    /**
     * Return true here if this data-item should be expandable with
     * an own embedded widget.
     * The default-implementation returns false.
     * */
    virtual bool isExpandable() const;

    /**
     * This will be called if isExpandable() returns true.
     *
     * A widget should be returned that will be embedded into the quickopen-list.
     * The widget will be owned by the quickopen-list and will be deleted at will.
     *
     * If the widget can be dynamic_cast'ed to QuickOpenEmbeddedWidgetInterface,
     * the additional interaction defined there will be possible.
     *
     * The default-implementation returns 0, which means no widget will be shown.
     * */
    virtual QWidget* expandingWidget() const;
};

typedef KSharedPtr<QuickOpenDataBase> QuickOpenDataPointer;

/**
 * Use this interface to provide custom quickopen-data to the quickopen-widget.
 *
 * If possible, you should use KDevelop::Filter (@file quickopenfilter.h )
 * to implement the actual filtering, so it is consistent.
 * */

class KDEVPLATFORMLANGUAGE_EXPORT QuickOpenDataProviderBase : public QObject {
  Q_OBJECT
  public:
    virtual ~QuickOpenDataProviderBase();

    /**
     * For efficiency, all changes to the filter-text are provided by the following 3 difference-operations.
     * */

    /**
     * Search-text was changed.
     * This is called whenever the search-text was changed, and the UI should be updated.
     * Store the text to track the exact difference.
     * */
    virtual void setFilterText( const QString& text ) = 0;

    /**
     * Filter-text should be completely reset and the context re-computed.
     * */
    virtual void reset() = 0;

    /**
     * Returns the count of items this provider currently represents
     * */
    virtual uint itemCount() const = 0;

    /**
     * Returns the data-items for a given range.
     * Generally, the items must addressed alphabetically,
     * they will be displayed in the same order in the
     * quickopen list.
     *
     * For performance-reasons the underlying models should
     * create the QuickOpenDataBase items on demand, because only
     * those that will really be shown will be requested.
     *
     * @param start First item to be returned
     * @param end Return items until here. end <= itemCount()
     * */
    virtual QList<QuickOpenDataPointer> data( uint start, uint end ) const = 0;

    /**
     * If the data-provider supports multiple different scopes/items, this will be called
     * with the enabled scopes/items.
     * If the data-provider supports only one scope/item, this can be ignored.
     * The lists contains all scopes/items, even those that are not supported by this provider.
     * */
    virtual void enableData( const QStringList& items, const QStringList& scopes );
};


}

#endif
