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/**
 * \file DNSClient.hxx - simple DNS resolver client for SimGear
 */

// Written by Torsten Dreyer
//
// Copyright (C) 2016 Torsten Dreyer - torsten (at) t3r (dot) de
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//

#ifndef SG_DNS_CLIENT_HXX
#define SG_DNS_CLIENT_HXX

#include <memory> // for std::unique_ptr
#include <string>
#include <vector>
#include <ctime> // for time_t

#include <simgear/structure/SGReferenced.hxx>
#include <simgear/structure/SGSharedPtr.hxx>
#include <simgear/structure/event_mgr.hxx>

namespace simgear
{

namespace DNS
{

class Client;
class Request : public SGReferenced
{
public:
    Request( const std::string & dn );
    virtual ~Request();
    std::string getDn() const { return _dn; }
    int getType() const { return _type; }
    bool isComplete() const { return _complete; }
    bool isTimeout() const;
    void setComplete( bool b = true ) { _complete = b; }

    virtual void submit( Client * client) = 0;

    std::string cname;
    std::string qname;
    unsigned ttl;
protected:
    std::string _dn;
    int _type;
    bool _complete;
    time_t _timeout_secs;
    time_t _start;
};
typedef SGSharedPtr<Request> Request_ptr;

class NAPTRRequest : public Request
{
public:
    NAPTRRequest( const std::string & dn );
    virtual void submit( Client * client );

    struct NAPTR : SGReferenced {
        int order;
        int preference;
        std::string flags;
        std::string service;
        std::string regexp;
        std::string replacement;
    };
    typedef SGSharedPtr<NAPTR> NAPTR_ptr;
    typedef std::vector<NAPTR_ptr> NAPTR_list;
    NAPTR_list entries;

    std::string qflags;
    std::string qservice;
};

class SRVRequest : public Request
{
public:
    SRVRequest( const std::string & dn );
    SRVRequest( const std::string & dn, const string & service, const string & protocol );
    virtual void submit( Client * client );

    struct SRV : SGReferenced {
      int priority;
      int weight;
      int port;
      std::string target;
    };
    typedef SGSharedPtr<SRV> SRV_ptr;
    typedef std::vector<SRV_ptr> SRV_list;
    SRV_list entries;
private:
    std::string _service;
    std::string _protocol;
};

class TXTRequest : public Request
{
public:
    TXTRequest( const std::string & dn );
    virtual void submit( Client * client );

    typedef std::vector<string> TXT_list;
    typedef std::map<std::string,std::string> TXT_Attribute_map;
    TXT_list entries;
    TXT_Attribute_map attributes;
};

class Client
{
public:
    Client();
    ~Client();

    void update(int waitTimeout = 0);

    void makeRequest(const Request_ptr& r);

//    void cancelRequest(const Request_ptr& r, std::string reason = std::string());

    class ClientPrivate;
    std::unique_ptr<ClientPrivate> d;
};

} // of namespace DNS

} // of namespace simgear

#endif // of SG_DNS_CLIENT_HXX