/*
    SPDX-FileCopyrightText: 2008 Joris Guisson <joris.guisson@gmail.com>
    SPDX-FileCopyrightText: 2008 Ivan Vasic <ivasic@gmail.com>

    SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef BTCHUNKSELECTORINTERFACE_H
#define BTCHUNKSELECTORINTERFACE_H

#include <ktorrent_export.h>
#include <util/constants.h>

namespace bt
{
class BitSet;
class Downloader;
class PeerManager;
class ChunkManager;
class PieceDownloader;

/**
 * @author Joris Guisson
 *
 * Interface class for selecting chunks to download.
 */
class KTORRENT_EXPORT ChunkSelectorInterface
{
public:
    ChunkSelectorInterface();
    virtual ~ChunkSelectorInterface();

    /**
     * Initialize the chunk selector, will be called automatically when
     * the ChunkSelector is set.
     * @param cman The ChunkManager
     * @param downer The Downloader
     * @param pman The PeerManager
     */
    virtual void init(ChunkManager *cman, Downloader *downer, PeerManager *pman);

    /**
     * Select which chunk to download for a PieceDownloader.
     * @param pd The PieceDownloader
     * @param chunk Index of chunk gets stored here
     * @return true upon succes, false otherwise
     */
    virtual bool select(PieceDownloader *pd, Uint32 &chunk) = 0;

    /**
     * Select a range of chunks to download from a webseeder.
     * @param from First chunk of the range
     * @param to Last chunk of the range
     * @param max_len Maximum length of range
     * @return true if everything is OK
     */
    virtual bool selectRange(Uint32 &from, Uint32 &to, Uint32 max_len);

    /**
     * Data has been checked, and these chunks are OK.
     * @param ok_chunks The ok_chunks
     * @param from First chunk of check
     * @param to Last chunk of check
     */
    virtual void dataChecked(const BitSet &ok_chunks, Uint32 from, Uint32 to) = 0;

    /**
     * A range of chunks has been reincluded. This is called when a user
     * reselects a file for download.
     * @param from The first chunk
     * @param to The last chunk
     */
    virtual void reincluded(Uint32 from, Uint32 to) = 0;

    /**
     * Reinsert a chunk. This is called when a chunk is corrupted or downloading it failed (hash doesn't match)
     * The selector should make sure that this is added again
     * @param chunk The chunk
     */
    virtual void reinsert(Uint32 chunk) = 0;

protected:
    ChunkManager *cman;
    Downloader *downer;
    PeerManager *pman;
};
}

#endif
