/**
 * UGENE - Integrated Bioinformatics Tools.
 * Copyright (C) 2008-2023 UniPro <ugene@unipro.ru>
 * http://ugene.net
 *
 * 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.
 *
 * 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.
 */

#pragma once

#include "Alignment.h"
#include "BgzfReader.h"
#include "Header.h"

namespace U2 {
namespace BAM {

class Reader {
public:
    Reader(IOAdapter& _ioAdapter)
        : ioAdapter(_ioAdapter) {
    }
    virtual const Header& getHeader() const = 0;
    virtual bool isEof() const = 0;
    virtual ~Reader() {
    }

protected:
    Header header;
    IOAdapter& ioAdapter;

    QHash<QByteArray, int> referencesMap;
    QHash<QByteArray, int> readGroupsMap;
    QHash<QByteArray, int> programsMap;
};

class BamReader : public Reader {
public:
    class AlignmentReader {
    public:
        AlignmentReader(BamReader* reader, int id, int blockSize);
        int getId() const;
        Alignment read();
        void skip();

    private:
        int id;
        int blockSize;
        BamReader* r;

        /**
         * Returns true if a number was read
         */
        bool readNumber(char type, QVariant& value, int& bytesRead);
    };

    BamReader(IOAdapter& ioAdapter);
    const Header& getHeader() const;
    Alignment readAlignment();
    AlignmentReader getAlignmentReader();
    bool isEof() const;
    VirtualOffset getOffset() const;
    void seek(VirtualOffset offset);

private:
    void readBytes(char* buffer, qint64 size);
    QByteArray readBytes(qint64 size);
    qint32 readInt32();
    quint32 readUint32();
    qint16 readInt16();
    quint16 readUint16();
    qint8 readInt8();
    quint8 readUint8();
    float readFloat32();
    char readChar();
    QByteArray readString();
    void readHeader();

    BgzfReader reader;
    friend class AlignmentReader;
};

}  // namespace BAM
}  // namespace U2
