#include <errno.h>
#include <signal.h>


#include <qpe/config.h>

#include "modem.h"
#include "pppconfig.h"
#include "pppmodule.h"
#include "pppdata.h"
#include "interfaceinformationppp.h"
#include "interfaceppp.h"

// don't polute global namespace
namespace {
    /*
     * If network settings is qutting and we've ppp
     * devices open we need to save the pid_t the PPData
     * and the interface number
     */
    struct Connection {
        pid_t pid;
        QString device;
        QString name;
    };
    class InterfaceKeeper {
    public:
        InterfaceKeeper();
        ~InterfaceKeeper();

        void addInterface( pid_t, const QString& pppDev, const QString& name );
        QMap<QString, Connection> interfaces()const; // will check if still available
    private:
        bool isAvailable( pid_t )const;
        QMap<QString, Connection> m_interfaces;
    };
}


/**
 * Constructor, find all of the possible interfaces
 * We also need to restore the state.. it could be that
 * an interface was up while closing the application
 * we need to be able to shut it down...
 */
PPPModule::PPPModule() : Module()
{
    InterfaceKeeper inFace;
    QMap<QString,Connection> running = inFace.interfaces();
    QStringList handledInterfaceNames;

    QMap<QString,QString> ifaces = PPPData::getConfiguredInterfaces();
    QMap<QString,QString>::Iterator it;
    InterfacePPP *iface;
    qDebug("getting interfaces");
    for( it = ifaces.begin(); it != ifaces.end(); ++it ){
        qDebug("ifaces %s %s", it.key().latin1(), it.data().latin1() );
        iface = new InterfacePPP( 0, it.key() );
        iface->setHardwareName( it.data() );
        list.append( (Interface*)iface );

        // check if (*it) is one of the running ifaces
        if ( running.contains( it.data() ) ) {
            qDebug("iface is running %s", it.key().latin1() );
            handledInterfaceNames << running[it.data()].device;
            iface->setStatus( true );
            iface->setPPPDpid( running[it.data()].pid );
            iface->modem()->setPPPDevice( running[it.data()].device );
            iface->refresh();
        }
    }

    setHandledInterfaceNames( handledInterfaceNames );
}

/**
 * Delete any interfaces that we own.
 */
PPPModule::~PPPModule(){
    qDebug("PPPModule::~PPPModule() " );
    QMap<QString,QString> ifaces;
    InterfaceKeeper keeper;
    Interface *i;
    for ( i=list.first(); i != 0; i=list.next() ){
        /* if online save the state */
        if ( i->getStatus() ) {
            qDebug("Iface %s is still up", i->getHardwareName().latin1() );
            InterfacePPP* ppp = static_cast<InterfacePPP*>(i);
            keeper.addInterface( ppp->pppPID(), ppp->pppDev(), ppp->getHardwareName() );
        }
        ifaces.insert( i->getInterfaceName(), i->getHardwareName() );
        delete i;
    }
    PPPData::setConfiguredInterfaces( ifaces );
}

/**
 * Change the current profile
 */
void PPPModule::setProfile(const QString &newProfile){
  profile = newProfile;
}

/**
 * get the icon name for this device.
 * @param Interface* can be used in determining the icon.
 * @return QString the icon name (minus .png, .gif etc)
 */
QString PPPModule::getPixmapName(Interface* ){
  return "ppp";
}

/**
 * Check to see if the interface i is owned by this module.
 * @param Interface* interface to check against
 * @return bool true if i is owned by this module, false otherwise.
 */
bool PPPModule::isOwner(Interface *i){
    return list.find( i ) != -1;
}

/**
 * Create, and return the WLANConfigure Module
 * @return QWidget* pointer to this modules configure.
 */
QWidget *PPPModule::configure(Interface *i){
    qDebug("return ModemWidget");
    PPPConfigWidget *pppconfig = new PPPConfigWidget( (InterfacePPP*)i,
                                                      0, "PPPConfig", false,
                                                      Qt::WDestructiveClose | Qt::WStyle_ContextHelp);
    return pppconfig;
}

/**
 * Create, and return the Information Module
 * @return QWidget* pointer to this modules info.
 */
QWidget *PPPModule::information(Interface *i){
  // We don't have any advanced pppd information widget yet :-D
  // TODO ^

   return new InterfaceInformationPPP( 0, "InterfaceInformationPPP", i );
}

/**
 * Get all active (up or down) interfaces
 * @return QList<Interface> A list of interfaces that exsist that havn't
 * been called by isOwner()
 */
QList<Interface> PPPModule::getInterfaces(){
  // List all of the files in the peer directory
    qDebug("PPPModule::getInterfaces");
  return list;
}

/**
 * Attempt to add a new interface as defined by name
 * @param name the name of the type of interface that should be created given
 *  by possibleNewInterfaces();
 * @return Interface* NULL if it was unable to be created.
 */
Interface *PPPModule::addNewInterface(const QString &newInterface){

  InterfacePPP *ifaceppp;
  Interface *iface;
  ifaceppp = new InterfacePPP();
  PPPConfigWidget imp(ifaceppp, 0, "PPPConfigImp", true);
  imp.showMaximized();
  if(imp.exec() == QDialog::Accepted ){
      iface = (InterfacePPP*) ifaceppp;
      iface->setModuleOwner( this );
      list.append( iface );
      return iface;
  }else {
      delete ifaceppp;
      iface = NULL;
  }
  return iface;
}

/**
 * Attempts to remove the interface, doesn't delete i
 * @return bool true if successful, false otherwise.
 */
bool PPPModule::remove(Interface *i){
    return list.remove(i);
}

void PPPModule::possibleNewInterfaces(QMap<QString, QString> &newIfaces)
{
    newIfaces.insert(QObject::tr("PPP") ,
                     QObject::tr("generic ppp device"));
}



namespace {
    InterfaceKeeper::InterfaceKeeper( ) {
    }
    InterfaceKeeper::~InterfaceKeeper() {
        Config cfg("ppp_plugin_keeper");
        QStringList lst = cfg.groupList();
        for (QStringList::Iterator it = lst.begin(); it != lst.end(); ++it ) {
            Connection con;
            cfg.setGroup( (*it) );
            cfg.clearGroup();
        }

        for (QMap<QString, Connection>::Iterator it = m_interfaces.begin(); it != m_interfaces.end(); ++it ) {
            Connection con = it.data();
            cfg.setGroup( con.name );
            cfg.writeEntry( "pid", con.pid );
            cfg.writeEntry( "device", con.device );
        }
    }
    void InterfaceKeeper::addInterface(pid_t pid, const QString& dev, const QString& name ) {
        Connection con;
        con.pid = pid;
        con.device = dev;
        con.name = name;
        m_interfaces.insert( name, con );
    }
    QMap<QString, Connection> InterfaceKeeper::interfaces()const {
        Config cfg("ppp_plugin_keeper");
        QMap<QString, Connection> ifaces;
        QStringList lst = cfg.groupList();
        for (QStringList::Iterator it = lst.begin(); it != lst.end(); ++it ) {
            Connection con;
            cfg.setGroup( (*it) );
            con.name = (*it);
            con.pid = cfg.readNumEntry("pid");
            con.device = cfg.readEntry("device");
            qDebug(" %s %s %d", con.name.latin1(), con.device.latin1(),  con.pid );

            if ( con.pid != -1 && isAvailable( con.pid ) )
                ifaces.insert( con.name, con );
        }
        return ifaces;
    }
    bool InterfaceKeeper::isAvailable( pid_t p)const {
        if (::kill(p, 0 ) == 0 || errno != ESRCH ) {
            qDebug("isAvailable %d",  p);
            return true;
        }

        qDebug("notAvailable %d", p);
        return false;
    }

}