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#ifndef Q3DNS_H

#define Q3DNS_H

#include <QtCore/qobject.h>

#include <QtNetwork/qhostaddress.h>

#include <QtCore/qsocketnotifier.h>

#include <QtCore/qstringlist.h>

#include <Qt3Support/q3valuelist.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Qt3Support)

#ifndef QT_NO_DNS

//#define Q_DNS_SYNCHRONOUS

class Q3DnsPrivate;

class Q_COMPAT_EXPORT Q3Dns: public QObject {

    Q_OBJECT

public:

    enum RecordType {

	None,

	A, Aaaa,

	Mx, Srv,

	Cname,

	Ptr,

	Txt

    };

    Q3Dns();

    Q3Dns( const QString & label, RecordType rr = A );

    Q3Dns( const QHostAddress & address, RecordType rr = Ptr );

    virtual ~Q3Dns();

    // to set/change the query

    virtual void setLabel( const QString & label );

    virtual void setLabel( const QHostAddress & address );

    QString label() const { return l; }

    virtual void setRecordType( RecordType rr = A );

    RecordType recordType() const { return t; }

    // whether something is happening behind the scenes

    bool isWorking() const;

    // to query for replies

    Q3ValueList<QHostAddress> addresses() const;

    class Q_COMPAT_EXPORT MailServer {

    public:

	MailServer( const QString & n=QString(), Q_UINT16 p=0 )

	    :name(n), priority(p) {}

	QString name;

	Q_UINT16 priority;

	Q_DUMMY_COMPARISON_OPERATOR(MailServer)

    };

    Q3ValueList<MailServer> mailServers() const;

    class Q_COMPAT_EXPORT Server {

    public:

	Server(const QString & n=QString(), Q_UINT16 p=0, Q_UINT16 w=0, Q_UINT16 po=0 )

	    : name(n), priority(p), weight(w), port(po) {}

	QString name;

	Q_UINT16 priority;

	Q_UINT16 weight;

	Q_UINT16 port;

	Q_DUMMY_COMPARISON_OPERATOR(Server)

    };

    Q3ValueList<Server> servers() const;

    QStringList hostNames() const;

    QStringList texts() const;

    QString canonicalName() const; // ### real-world but uncommon: QStringList

    QStringList qualifiedNames() const { return n; }

#if defined(Q_DNS_SYNCHRONOUS)

protected:

    void connectNotify( const char *signal );

#endif

Q_SIGNALS:

    void resultsReady();

private Q_SLOTS:

    void startQuery();

private:

    static void doResInit();

    void setStartQueryTimer();

    static QString toInAddrArpaDomain( const QHostAddress &address );

#if defined(Q_DNS_SYNCHRONOUS)

    void doSynchronousLookup();

#endif

    QString l;

    QStringList n;

    RecordType t;

    Q3DnsPrivate * d;

    friend class Q3DnsAnswer;

    friend class Q3DnsManager;

};

// Q3DnsSocket are sockets that are used for DNS lookup

class Q3DnsSocket: public QObject {

    Q_OBJECT

    // note: Private not public.  This class contains NO public API.

protected:

    Q3DnsSocket( QObject *, const char * );

    virtual ~Q3DnsSocket();

private Q_SLOTS:

    virtual void cleanCache();

    virtual void retransmit();

    virtual void answer();

};

#endif // QT_NO_DNS

QT_END_NAMESPACE

QT_END_HEADER

#endif // Q3DNS_H