/***************************************************************************
 *   Copyright (C) 2009                                                    *
 *                                                                         *
 *   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.             *
 ***************************************************************************/

#include <iostream>
#include <QStringList>
#include <QRegExp>
#include <QApplication>
#include <QMimeData>
#include <QClipboard>
#include <QDesktopServices>
#include <QMessageBox>
#include <QIcon>
#include <QObject>

#include "RetroShareLink.h"
#include "util/misc.h"

#include <retroshare/rsfiles.h>
#include <retroshare/rspeers.h>

#define DEBUG_RSLINK 1

#define HEADER_FILE 	"retroshare://file"
#define HEADER_PERSON	"retroshare://person"

RetroShareLink::RetroShareLink(const QUrl& url)
{
    const QString stringurl = url.toString();
    fromString(stringurl);
}

RetroShareLink::RetroShareLink(const QString& url)
{
    fromString(url);
}

void RetroShareLink::fromString(const QString& url)
{
    _valid = false;

    // parse
#ifdef DEBUG_RSLINK
    std::cerr << "got new RS link \"" << url.toStdString() << "\"" << std::endl ;
#endif
    QStringList list = url.split ("|");

    if (list.size() >= 1) {
        if (list.size() == 4 && list[0] == HEADER_FILE) {
            bool ok ;

            _type = TYPE_FILE;
            _name = list[1] ;
            _size = list[2].toULongLong(&ok) ;
            _hash = list[3].left(40) ;	// normally not necessary, but it's a security.

            if (ok) {
#ifdef DEBUG_RSLINK
                std::cerr << "New RetroShareLink forged:" << std::endl ;
                std::cerr << "  name = \"" << _name.toStdString() << "\"" << std::endl ;
                std::cerr << "  hash = \"" << _hash.toStdString() << "\"" << std::endl ;
                std::cerr << "  size = " << _size << std::endl ;
#endif
                check();
                return;
            }
        } else if (list.size() == 3 && list[0] == HEADER_PERSON) {
            _type = TYPE_PERSON;
            _name = list[1] ;
            _hash = list[2].left(40) ;	// normally not necessary, but it's a security.
            _size = 0;
            check();
            return;
        }

        // bad link
    }

#ifdef DEBUG_RSLINK
    std::cerr << "Wrongly formed RS link. Can't process." << std::endl ;
#endif
    _type = TYPE_UNKNOWN;
    _hash = "" ;
    _size = 0 ;
    _name = "" ;
}

RetroShareLink::RetroShareLink(const QString & name, uint64_t size, const QString & hash)
    : _name(name),_size(size),_hash(hash)
{
    _valid = false;
    _type = TYPE_FILE;
    check() ;
}

RetroShareLink::RetroShareLink(const QString & name, const QString & hash)
    : _name(name),_size(0),_hash(hash)
{
    _valid = false;
    _type = TYPE_PERSON;
    check() ;
}

void RetroShareLink::check()
{
    _valid = true;

    switch (_type) {
    case TYPE_UNKNOWN:
        _valid = false;
        break;
    case TYPE_FILE:
        if(_size > (((uint64_t)1)<<40))	// 1TB. Who has such large files?
            _valid = false;

        if(!checkName(_name))
            _valid = false;

        if(!checkHash(_hash))
            _valid = false;
        break;
    case TYPE_PERSON:
        if(_size != 0)
            _valid = false;

        if(_name.isEmpty())
            _valid = false;

        if(_hash.isEmpty())
            _valid = false;
        break;
    }

    if(!_valid) // we should throw an exception instead of this crap, but drbob doesn't like exceptions. Why ???
    {
        _type = TYPE_UNKNOWN;
        _hash = "" ;
        _name = "" ;
        _size = 0 ;
    }
}

QString RetroShareLink::toString() const
{
    switch (_type) {
    case TYPE_UNKNOWN:
        break;
    case TYPE_FILE:
        return QString(HEADER_FILE) + "|" + _name + "|" + QString::number(_size) + "|" + _hash;
    case TYPE_PERSON:
        return QString(HEADER_PERSON) + "|" + _name + "|" + _hash;
    }

    return "";
}

QString RetroShareLink::niceName() const
{
    if (type() == TYPE_PERSON) {
        return name() + "@" + hash();
    }

    return name();
}

QString RetroShareLink::toHtml() const
{
    return QString("<a href='") + toString() + "'>" + niceName() + "</a>" ;
}

QString RetroShareLink::toHtmlFull() const
{
    return QString("<a href='") + toString() + "'>" + toString() + "</a>" ;
}

QString RetroShareLink::toHtmlSize() const
{
	return QString("<a href='") + toString() + "'>" + name() +"</a>" + " " + "<HTML><font color=\"blue\">" + "(" +  misc::friendlyUnit(_size)   + ")" +"</font></HTML>";
}

bool RetroShareLink::checkName(const QString& name)
{
    if(name == "")
        return false ;

    for(int i=0;i<name.length();++i)
    {
        QChar::Category cat( name[i].category() ) ;

        if(	cat == QChar::Separator_Line
                || cat == QChar::Other_NotAssigned
                )
        {
#ifdef DEBUG_RSLINK
            std::cerr <<"Unwanted category " << cat << " at place " << i << " in string \"" << name.toStdString() << "\"" << std::endl ;
#endif
            return false ;
        }
    }

    return true ;
}

QUrl RetroShareLink::toUrl() const
{
    return QUrl(toString()) ;
}

bool RetroShareLink::checkHash(const QString& hash)
{
    if(hash.length() != 40)
        return false ;

    QByteArray qb(hash.toAscii()) ;

    for(int i=0;i<qb.length();++i)
    {
        unsigned char b(qb[i]) ;

        if(!((b>47 && b<58) || (b>96 && b<103)))
            return false ;
    }

    return true ;
}

bool RetroShareLink::process(std::list<std::string> *psrcIds, int flag)
{
    if (valid() == false) {
        std::cerr << " RetroShareLink::process invalid request" << std::endl;
        return false;
    }

    switch (type()) {
    case TYPE_UNKNOWN:
        break;

    case TYPE_FILE:
        {
            std::cerr << " RetroShareLink::process FileRequest : fileName : " << name().toStdString() << ". fileHash : " << hash().toStdString() << ". fileSize : " << size() << std::endl;

            std::list<std::string> srcIds;
            if (psrcIds) {
                srcIds = *psrcIds;
            }

            if (rsFiles->FileRequest(name().toStdString(), hash().toStdString(), size(), "", RS_FILE_HINTS_NETWORK_WIDE, srcIds)) {
                if (flag & RSLINK_PROCESS_NOTIFY_SUCCESS) {
                    QMessageBox mb(QObject::tr("File Request Confirmation"), QObject::tr("The file has been added to your download list."),QMessageBox::Information,QMessageBox::Ok,0,0);
                    mb.setButtonText( QMessageBox::Ok, "OK" );
                    mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
                    mb.exec();
                }
                return true;
            }

            if (flag & RSLINK_PROCESS_NOTIFY_ERROR) {
                QMessageBox mb(QObject::tr("File Request canceled"), QObject::tr("The file has not been added to your download list, because you already have it."),QMessageBox::Critical,QMessageBox::Ok,0,0);
                mb.setButtonText( QMessageBox::Ok, "OK" );
                mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
                mb.exec();
            }
            return false;
        }

    case TYPE_PERSON:
        {
            std::cerr << " RetroShareLink::process FriendRequest : name : " << name().toStdString() << ". id : " << hash().toStdString() << std::endl;

            RsPeerDetails detail;
            if (rsPeers->getPeerDetails(hash().toStdString(), detail)) {
                if (detail.gpg_id == rsPeers->getGPGOwnId()) {
                    // it's me, do nothing
                    return true;
                }

                if (detail.accept_connection) {
                    // peer connection is already accepted
                    if (flag & RSLINK_PROCESS_NOTIFY_SUCCESS) {
                        QMessageBox mb(QObject::tr("Friend Request Confirmation"), QObject::tr("The friend is already in your list."),QMessageBox::Information,QMessageBox::Ok,0,0);
                        mb.setButtonText( QMessageBox::Ok, "OK" );
                        mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
                        mb.exec();
                    }
                    return true;
                }

                if (rsPeers->setAcceptToConnectGPGCertificate(hash().toStdString(), true)) {
                    if (flag & RSLINK_PROCESS_NOTIFY_SUCCESS) {
                        QMessageBox mb(QObject::tr("Friend Request Confirmation"), QObject::tr("The friend has been added to your list."),QMessageBox::Information,QMessageBox::Ok,0,0);
                        mb.setButtonText( QMessageBox::Ok, "OK" );
                        mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
                        mb.exec();
                    }
                    return true;
                }

                if (flag & RSLINK_PROCESS_NOTIFY_ERROR) {
                    QMessageBox mb(QObject::tr("Friend Request canceled"), QObject::tr("The friend could not be added to your list."),QMessageBox::Critical,QMessageBox::Ok,0,0);
                    mb.setButtonText( QMessageBox::Ok, "OK" );
                    mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
                    mb.exec();
                }
                return false;
            }

            if (flag & RSLINK_PROCESS_NOTIFY_ERROR) {
                QMessageBox mb(QObject::tr("Friend Request canceled"), QObject::tr("The friend could not be found."),QMessageBox::Critical,QMessageBox::Ok,0,0);
                mb.setButtonText( QMessageBox::Ok, "OK" );
                mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
                mb.exec();
            }
            return false;
        }
    }

    std::cerr << " RetroShareLink::process unknown type: " << type() << std::endl;

    if (flag & RSLINK_PROCESS_NOTIFY_ERROR) {
        QMessageBox mb(QObject::tr("File Request Error"), QObject::tr("The file link is malformed."),QMessageBox::Critical,QMessageBox::Ok,0,0);
        mb.setButtonText( QMessageBox::Ok, "OK" );
        mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
        mb.exec();
    }
    return false;
}

/*static*/ bool RetroShareLink::processUrl(const QUrl &url, std::list<std::string> *psrcIds, int flag)
{
    if (url.scheme() == "http") {
        QDesktopServices::openUrl(url);
        return true;
    }

    if (url.scheme() == "retroshare") {
        // QUrl can't handle the RetroShare link format properly
        if (flag & RSLINK_PROCESS_NOTIFY_ERROR) {
            QMessageBox mb(QObject::tr("File Request"), QObject::tr("Process of RetroShare links is not implemented. Please use copy instead."),QMessageBox::Critical,QMessageBox::Ok,0,0);
            mb.setButtonText( QMessageBox::Ok, "OK" );
            mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
            mb.exec();
        }

//        RetroShareLink link(url);
//
//        if (link.valid()) {
//            return link.process(psrcId, flag);
//        }
//
//        if (flag & RSLINK_PROCESS_NOTIFY_ERROR) {
//            QMessageBox mb(QObject::tr("File Request Error"), QObject::tr("The file link is malformed."),QMessageBox::Information,QMessageBox::Ok,0,0);
//second version: QMessageBox mb(QObject::tr("Badly formed RS link"), QObject::tr("This RetroShare link is malformed. This is bug. Please contact the developers.\n\nNote: this possibly comes from a bug in Qt4.6. Try to right-click + copy link location, and paste in Transfer Tab."),QMessageBox::Critical,QMessageBox::Ok,0,0);
//            mb.setButtonText( QMessageBox::Ok, "OK" );
//            mb.setWindowIcon(QIcon(QString::fromUtf8(":/images/rstray3.png")));
//            mb.exec();
//        }

        return false;
    }

    if (url.scheme().isEmpty()) {
        //it's probably a web adress, let's add http:// at the beginning of the link
        QString newAddress = "http://" + url.toString();
        QDesktopServices::openUrl(QUrl(newAddress));
        return true;
    }

    return false;
}

void RSLinkClipboard::copyLinks(const std::vector<RetroShareLink>& links) 
{
    QString res ;
    for(uint32_t i=0;i<links.size();++i)
        res += links[i].toString() + "\n" ;

    QApplication::clipboard()->setText(res) ;
}

void RSLinkClipboard::pasteLinks(std::vector<RetroShareLink> &links) 
{
    return parseClipboard(links);
}

void RSLinkClipboard::parseClipboard(std::vector<RetroShareLink> &links)
{
    // parse clipboard for links.
    //
    links.clear();
    QString text = QApplication::clipboard()->text() ;

    std::cerr << "Parsing clipboard:" << text.toStdString() << std::endl ;

    QRegExp rx("retroshare://(file|person)[^\r\n]+") ;

    int pos = 0;

    while((pos = rx.indexIn(text, pos)) != -1)
    {
        QString url(text.mid(pos, rx.matchedLength()));
        RetroShareLink link(url);

        if(link.valid())
        {
            // check that the link is not already in the list:
            bool already = false ;
            for(uint32_t i=0;i<links.size();++i)
                if(links[i] == link)
                {
                already = true ;
                break ;
            }

            if(!already)
            {
                links.push_back(link) ;
                std::cerr << "captured link: " << link.toString().toStdString() << std::endl ;
            }
        }
        else
            std::cerr << "invalid link" << std::endl ;

        pos += rx.matchedLength();
    }
}

QString RSLinkClipboard::toString()
{
    std::vector<RetroShareLink> links;
    parseClipboard(links);

    QString res ;
    for(uint32_t i=0;i<links.size();++i)
        res += links[i].toString() + "\n" ;

    return res ;
}

QString RSLinkClipboard::toHtml()
{
    std::vector<RetroShareLink> links;
    parseClipboard(links);

    QString res ;
    for(uint32_t i=0;i<links.size();++i)
        res += links[i].toHtml() + "<br/>" ;

    return res ;
}

QString RSLinkClipboard::toHtmlFull()
{
    std::vector<RetroShareLink> links;
    parseClipboard(links);

    QString res ;
    for(uint32_t i=0;i<links.size();++i)
        res += links[i].toHtmlFull() + "<br/>" ;

    return res ;
}

bool RSLinkClipboard::empty(RetroShareLink::enumType type /*= RetroShareLink::TYPE_UNKNOWN*/)
{
    std::vector<RetroShareLink> links;
    parseClipboard(links);

    if (type == RetroShareLink::TYPE_UNKNOWN) {
        return links.empty();
    }

    for (std::vector<RetroShareLink>::iterator link = links.begin(); link != links.end(); link++) {
        if (link->type() == type) {
            return false;
        }
    }

    return true;
}

/*static*/ int RSLinkClipboard::process(RetroShareLink::enumType type /*= RetroShareLink::TYPE_UNKNOWN*/, int flag /*= RSLINK_PROCESS_NOTIFY_ALL*/)
{
    std::vector<RetroShareLink> links;
    pasteLinks(links);

    int count = 0;

    for (uint32_t i = 0; i < links.size(); i++) {
        if (links[i].valid() && (type == RetroShareLink::TYPE_UNKNOWN || links[i].type() == type)) {
            if (links[i].process(NULL, flag)) {
                count++;
            }
        }
    }

    return count;
}