/*
 * Copyright (C) 2001-2011 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef DCPLUSPLUS_DCPP_USER_CONNECTION_H
#define DCPLUSPLUS_DCPP_USER_CONNECTION_H

#include "forward.h"
#include "TimerManager.h"
#include "UserConnectionListener.h"
#include "BufferedSocketListener.h"
#include "BufferedSocket.h"
#include "CriticalSection.h"
#include "File.h"
#include "User.h"
#include "AdcCommand.h"
#include "MerkleTree.h"
#include "DebugManager.h"
#ifdef LUA_SCRIPT
#include "ScriptManager.h"
#endif

namespace dcpp {
#ifdef LUA_SCRIPT
class UserConnectionScriptInstance : public ScriptInstance {
protected:
        bool onUserConnectionMessageIn(UserConnection* aConn, const string& aLine);
        bool onUserConnectionMessageOut(UserConnection* aConn, const string& aLine);
};
#endif

class UserConnection : public Speaker<UserConnectionListener>,
    private BufferedSocketListener, public Flags, private CommandHandler<UserConnection>,
    private boost::noncopyable
#ifdef LUA_SCRIPT
, public UserConnectionScriptInstance
#endif
{
public:
    friend class ConnectionManager;

    static const string FEATURE_MINISLOTS;
    static const string FEATURE_XML_BZLIST;
    static const string FEATURE_ADCGET;
    static const string FEATURE_ZLIB_GET;
    static const string FEATURE_TTHL;
    static const string FEATURE_TTHF;
    static const string FEATURE_ADC_BAS0;
    static const string FEATURE_ADC_BASE;
    static const string FEATURE_ADC_BZIP;
    static const string FEATURE_ADC_TIGR;

    static const string FILE_NOT_AVAILABLE;

    enum Modes {
        MODE_COMMAND = BufferedSocket::MODE_LINE,
        MODE_DATA = BufferedSocket::MODE_DATA
    };

    enum Flags {
        FLAG_NMDC = 0x01,
        FLAG_OP = FLAG_NMDC << 1,
        FLAG_UPLOAD = FLAG_OP << 1,
        FLAG_DOWNLOAD = FLAG_UPLOAD << 1,
        FLAG_INCOMING = FLAG_DOWNLOAD << 1,
        FLAG_ASSOCIATED = FLAG_INCOMING << 1,
        FLAG_HASSLOT = FLAG_ASSOCIATED << 1,
        FLAG_HASEXTRASLOT = FLAG_HASSLOT << 1,
        FLAG_INVALIDKEY = FLAG_HASEXTRASLOT << 1,
        FLAG_SUPPORTS_MINISLOTS = FLAG_INVALIDKEY << 1,
        FLAG_SUPPORTS_XML_BZLIST = FLAG_SUPPORTS_MINISLOTS << 1,
        FLAG_SUPPORTS_ADCGET = FLAG_SUPPORTS_XML_BZLIST << 1,
        FLAG_SUPPORTS_ZLIB_GET = FLAG_SUPPORTS_ADCGET << 1,
        FLAG_SUPPORTS_TTHL = FLAG_SUPPORTS_ZLIB_GET << 1,
        FLAG_SUPPORTS_TTHF = FLAG_SUPPORTS_TTHL << 1
    };

    enum States {
        // ConnectionManager
        STATE_UNCONNECTED,
        STATE_CONNECT,

        // Handshake
        STATE_SUPNICK,      // ADC: SUP, Nmdc: $Nick
        STATE_INF,
        STATE_LOCK,
        STATE_DIRECTION,
        STATE_KEY,

        // UploadManager
        STATE_GET,          // Waiting for GET
        STATE_SEND,         // Waiting for $Send

        // DownloadManager
        STATE_SND,  // Waiting for SND
        STATE_IDLE, // No more downloads for the moment

        // Up & down
        STATE_RUNNING,      // Transmitting data

    };

    short getNumber() { return (short)((((size_t)this)>>2) & 0x7fff); }

    // NMDC stuff
    void myNick(const string& aNick) { send("$MyNick " + Text::fromUtf8(aNick, encoding) + '|'); }
    void lock(const string& aLock, const string& aPk) { send ("$Lock " + aLock + " Pk=" + aPk + '|'); }
    void key(const string& aKey) { send("$Key " + aKey + '|'); }
    void direction(const string& aDirection, int aNumber) { send("$Direction " + aDirection + " " + Util::toString(aNumber) + '|'); }
    void fileLength(const string& aLength) { send("$FileLength " + aLength + '|'); }
    void error(const string& aError) { send("$Error " + aError + '|'); }
    void listLen(const string& aLength) { send("$ListLen " + aLength + '|'); }
    void maxedOut() { isSet(FLAG_NMDC) ? send("$MaxedOut|") : send(AdcCommand(AdcCommand::SEV_RECOVERABLE, AdcCommand::ERROR_SLOTS_FULL, "Slots full")); }
    void fileNotAvail(const std::string& msg = FILE_NOT_AVAILABLE) { isSet(FLAG_NMDC) ? send("$Error " + msg + "|") : send(AdcCommand(AdcCommand::SEV_RECOVERABLE, AdcCommand::ERROR_FILE_NOT_AVAILABLE, msg)); }
    void supports(const StringList& feat);

    // ADC Stuff
    void sup(const StringList& features);
    void inf(bool withToken);
    void get(const string& aType, const string& aName, const int64_t aStart, const int64_t aBytes) { send(AdcCommand(AdcCommand::CMD_GET).addParam(aType).addParam(aName).addParam(Util::toString(aStart)).addParam(Util::toString(aBytes))); }
    void snd(const string& aType, const string& aName, const int64_t aStart, const int64_t aBytes) { send(AdcCommand(AdcCommand::CMD_SND).addParam(aType).addParam(aName).addParam(Util::toString(aStart)).addParam(Util::toString(aBytes))); }
    void send(const AdcCommand& c) { send(c.toString(0, isSet(FLAG_NMDC))); }

    void setDataMode(int64_t aBytes = -1) { dcassert(socket); socket->setDataMode(aBytes); }
    void setLineMode(size_t rollback) { dcassert(socket); socket->setLineMode(rollback); }

        void connect(const string& aServer, uint16_t aPort, uint16_t localPort, const BufferedSocket::NatRoles natRole) throw(SocketException, ThreadException);
    void accept(const Socket& aServer) throw(SocketException, ThreadException);

    void updated() { if(socket) socket->updated(); }

    void disconnect(bool graceless = false) { if(socket) socket->disconnect(graceless); }
    void transmitFile(InputStream* f) { socket->transmitFile(f); }

    const string& getDirectionString() {
        dcassert(isSet(FLAG_UPLOAD) ^ isSet(FLAG_DOWNLOAD));
        return isSet(FLAG_UPLOAD) ? UPLOAD : DOWNLOAD;
    }

    const UserPtr& getUser() const { return user; }
    UserPtr& getUser() { return user; }
        const HintedUser getHintedUser() const { return HintedUser(user, hubUrl); }

    bool isSecure() const { return socket && socket->isSecure(); }
    bool isTrusted() const { return socket && socket->isTrusted(); }
    std::string getCipherName() const { return socket ? socket->getCipherName() : Util::emptyString; }
    vector<uint8_t> getKeyprint() const { return socket ? socket->getKeyprint() : vector<uint8_t>(); }
    std::string getRemoteIp() const { return socket ? socket->getIp() : Util::emptyString; }
    Download* getDownload() { dcassert(isSet(FLAG_DOWNLOAD)); return download; }
    void setDownload(Download* d) { dcassert(isSet(FLAG_DOWNLOAD)); download = d; }
    Upload* getUpload() { dcassert(isSet(FLAG_UPLOAD)); return upload; }
    void setUpload(Upload* u) { dcassert(isSet(FLAG_UPLOAD)); upload = u; }

    void handle(AdcCommand::SUP t, const AdcCommand& c) { fire(t, this, c); }
    void handle(AdcCommand::INF t, const AdcCommand& c) { fire(t, this, c); }
    void handle(AdcCommand::GET t, const AdcCommand& c) { fire(t, this, c); }
    void handle(AdcCommand::SND t, const AdcCommand& c) { fire(t, this, c); }
    void handle(AdcCommand::STA t, const AdcCommand& c);
    void handle(AdcCommand::RES t, const AdcCommand& c) { fire(t, this, c); }
    void handle(AdcCommand::GFI t, const AdcCommand& c) { fire(t, this, c); }

    // Ignore any other ADC commands for now
    template<typename T> void handle(T , const AdcCommand& ) { }

    int64_t getChunkSize() const { return chunkSize; }
    void updateChunkSize(int64_t leafSize, int64_t lastChunk, uint64_t ticks);
    void sendRaw(const string& raw) { send(raw); }//aded
    GETSET(string, hubUrl, HubUrl);
    GETSET(string, token, Token);
    GETSET(string, encoding, Encoding);
    GETSET(States, state, State);
    GETSET(uint64_t, lastActivity, LastActivity);
    GETSET(double, speed, Speed);
private:
    int64_t chunkSize;
    BufferedSocket* socket;
    bool secure;
    UserPtr user;

    static const string UPLOAD, DOWNLOAD;

    union {
        Download* download;
        Upload* upload;
    };

    // We only want ConnectionManager to create this...
    UserConnection(bool secure_) throw() : encoding(Text::systemCharset), state(STATE_UNCONNECTED),
        lastActivity(0), speed(0), chunkSize(0), socket(0), secure(secure_), download(NULL) {
    }

    virtual ~UserConnection() throw() {
        BufferedSocket::putSocket(socket);
    }

    friend struct DeleteFunction;

    void setUser(const UserPtr& aUser) {
        user = aUser;
    }

    void onLine(const string& aLine) throw();

    void send(const string& aString) {
        lastActivity = GET_TICK();
        COMMAND_DEBUG(aString, DebugManager::CLIENT_OUT, getRemoteIp());
#ifdef LUA_SCRIPT
        if(onUserConnectionMessageOut(this, aString)) {
            disconnect(true);
            return;
        }
#endif
        socket->write(aString);
    }

    virtual void on(Connected) throw();
    virtual void on(Line, const string&) throw();
    virtual void on(Data, uint8_t* data, size_t len) throw();
    virtual void on(BytesSent, size_t bytes, size_t actual) throw() ;
    virtual void on(ModeChange) throw();
    virtual void on(TransmitDone) throw();
    virtual void on(Failed, const string&) throw();
    virtual void on(Updated) throw();
};

} // namespace dcpp

#endif // !defined(USER_CONNECTION_H)
