/*
 * Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
 *
 * 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, see <https://www.gnu.org/licenses/>.
 */

#pragma once

#include <deque>

#include "forward.h"
#include "MerkleTree.h"
#include "CriticalSection.h"
#include "NonCopyable.h"
#include "Segment.h"
#include "GetSet.h"

namespace dcpp {

using std::deque;

class Transfer : private NonCopyable {
public:
    enum Type {
        TYPE_FILE,
        TYPE_FULL_LIST,
        TYPE_PARTIAL_LIST,
        TYPE_TREE,
        TYPE_LAST
    };

    static const string names[TYPE_LAST];

    static const string USER_LIST_NAME;
    static const string USER_LIST_NAME_BZ;

    Transfer(UserConnection& conn, const string& path, const TTHValue& tth);
    virtual ~Transfer() { };

    int64_t getPos() const { return pos; }

    int64_t getStartPos() const { return getSegment().getStart(); }

    void resetPos() { pos = 0; }

    void addPos(int64_t aBytes, int64_t aActual) { pos += aBytes; actual+= aActual; }

    enum { MIN_SAMPLES = 15, MIN_SECS = 15 };

    /** Record a sample for average calculation */
    void tick();

    int64_t getActual() const { return actual; }

    int64_t getSize() const { return getSegment().getSize(); }
    void setSize(int64_t size) { segment.setSize(size); }

    double getAverageSpeed() const;

    int64_t getSecondsLeft() const {
        double avg = getAverageSpeed();
        return (avg > 0) ? (getBytesLeft() / avg) : 0;
    }

    int64_t getBytesLeft() const {
        return getSize() - getPos();
    }

    virtual void getParams(const UserConnection& aSource, ParamMap& params);

    UserPtr getUser();
    const UserPtr getUser() const;
    HintedUser getHintedUser() const;

    const string& getPath() const { return path; }
    const TTHValue& getTTH() const { return tth; }

    UserConnection& getUserConnection() { return userConnection; }
    const UserConnection& getUserConnection() const { return userConnection; }
    bool getOverlapped() const { return getSegment().getOverlapped(); }
    void setOverlapped(bool overlap) { segment.setOverlapped(overlap); }
    GETSET(Segment, segment, Segment);
    GETSET(Type, type, Type);
    GETSET(uint64_t, start, Start);
private:

    typedef std::pair<uint64_t, int64_t> Sample;
    typedef deque<Sample> SampleList;

    SampleList samples;
    mutable CriticalSection cs;

    /** The file being transferred */
    string path;
    /** TTH of the file being transferred */
    TTHValue tth;
    /** Bytes transferred over socket */
    int64_t actual;
    /** Bytes transferred to/from file */
    int64_t pos;

    UserConnection& userConnection;
};

} // namespace dcpp
