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#ifndef ucoolib_arch_host_mex_mex_node_hh
#define ucoolib_arch_host_mex_mex_node_hh
// ucoolib - Microcontroller object oriented library. {{{
//
// Copyright (C) 2012 Nicolas Schodet
//
// APBTeam:
//        Web: http://apbteam.org/
//      Email: team AT apbteam DOT org
//
// 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 "ucoolib/common.hh"
#include "mex_msg.hh"
#include "mex_socket.hh"

#include <memory>
#include <map>

namespace ucoo {
namespace mex {

class Node;

/// Abstract message reception handler.
class Handler
{
  public:
    /// Handle a received message or request.
    virtual void handle (Msg &msg) = 0;
};

/// Helper class for member function reception handler.
template<class T>
class HandlerMemfun : public Handler
{
  public:
    HandlerMemfun (T &obj, void (T::*f) (Msg &))
        : obj_ (obj), f_ (f) { }
    void handle (Msg &msg) { (obj_.*f_) (msg); }
  private:
    T &obj_;
    void (T::*f_) (Msg &);
};

/// Helper class for static function reception handler.
class HandlerPtrfun : public Handler
{
  public:
    HandlerPtrfun (void (*f) (Msg &)) : f_ (f) { }
    void handle (Msg &msg) { f_ (msg); }
  private:
    void (*f_) (Msg &);
};

/// Mex node, singleton.
class Node
{
  public:
    /// Connect to mex hub.
    Node ();
    /// Disconnect.
    ~Node ();
    /// Get single instance, may return NULL if none constructed.
    static Node *instance () { return instance_; }
    /// Wait forever.
    void wait ();
    /// Wait until date is reached.
    void wait (uint32_t date);
    /// Return current date.
    uint32_t date () const { return date_; }
    /// Send a message.
    void send (Msg &msg);
    /// Send a request and return response.
    std::auto_ptr<Msg> request (Msg &msg);
    /// Send a response while handling a request.
    void response (Msg &msg);
    /// Reserve a message type.
    mtype_t reserve (const char *name);
    /// Register an handler for a message type.
    void handler_register (mtype_t mtype, Handler &handler);
  private:
    /// Receive one message.
    std::auto_ptr<Msg> recv ();
    /// Dispatch message to the right handler.
    void dispatch (Msg &msg);
    /// Handle an incomming DATE message.
    void handle_date (Msg &msg);
    /// Handle an incomming REQ message.
    void handle_req (Msg &msg);
  private:
    /// Pointer to single instance.
    static Node *instance_;
    /// Connection to hub.
    Socket socket_;
    /// Current date.
    uint32_t date_;
    /// When handling a request, this is the request identifier, else -1.
    int req_;
    /// Registered handlers.
    typedef std::map<mtype_t, Handler *> handlers_type;
    handlers_type handlers_;
    /// Handlers objects.
    HandlerMemfun<Node> handler_date, handler_req;
};

} // namespace mex
} // namespace ucoo

#endif // ucoolib_arch_host_mex_mex_node_hh