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 *	This product includes software developed by the Computer Systems
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 * $Header: /nfs/jade/vint/CVSROOT/ns-2/common/node.h,v 1.33 2002/05/30 17:44:03 haldar Exp $
 */

/*
 * XXX GUIDELINE TO ADDING FUNCTIONALITY TO THE BASE NODE
 *
 * One should not add something specific to one particular routing module 
 * into the base node, which is shared by all modules in ns. Otherwise you 
 * bloat other people's simulations.
 */

/*
 * CMU-Monarch project's Mobility extensions ported by Padma Haldar, 
 * 10/98.
 */
 
#ifndef __ns_node_h__
#define __ns_node_h__

#include "connector.h"
#include "object.h"
#include "lib/bsd-list.h"

#include "phy.h"
#include "net-interface.h"
#include "energy-model.h"
#include "location.h"
#include "rtmodule.h"

class NixNode;
class LinkHead;

LIST_HEAD(linklist_head, LinkHead); // declare list head structure 
/*
 * The interface between a network stack and the higher layers.
 * This is analogous to the OTcl Link class's "head_" object.
 * XXX This object should provide a uniform API across multiple link objects;
 * right now it is a placeholder.  See satlink.h for now.  It is declared in
 * node.h for now since all nodes have a linked list of LinkHeads.
 */

#include "parentnode.h"

class Node;
class NetworkInterface;
class RoutingModule;
class LinkHead : public Connector {
public:
	LinkHead(); 

	// API goes here
	Node* node() { return node_; }
	int type() { return type_; }
	int32_t label();
	// Future API items could go here 

	// list of all networkinterfaces on a node
	inline void insertlink(struct linklist_head *head) {
                LIST_INSERT_HEAD(head, this, link_entry_);
        }
        LinkHead* nextlinkhead(void) const { return link_entry_.le_next; }

protected:
	virtual int command(int argc, const char*const* argv);
	NetworkInterface* net_if_; // Each link has a Network Interface
	Node* node_; // Pointer to node object
	int type_; // Type of link
	// Each node has a linked list of link heads
	LIST_ENTRY(LinkHead) link_entry_;

};

LIST_HEAD(node_head, Node); // declare list head structure 

//declare the neighbor list structure
//added for pushback, but should be useful otherwise also.
//there was something here which was moved to energy model. 
//since that work is in flux, i am not meddling with it.
struct neighbor_list_node {
	int nodeid;
	neighbor_list_node* next;
};

// Size of the buffer for dumping nam traces.
const int NODE_NAMLOG_BUFSZ = 256;

//routing module node used for creating rtg module list
struct rtm_node {
	RoutingModule* rtm;
	rtm_node* next;
};

class Node : public ParentNode {
public:
	Node(void);
	~Node();

	inline int address() { return address_;}
	inline int nodeid() { return nodeid_;}
	inline bool exist_namchan() const { return (namChan_ != 0); }

	virtual int command(int argc, const char*const* argv);
	virtual void namlog(const char *fmt, ...);

	NsObject* intf_to_target(int32_t); 

	static struct node_head nodehead_;  // static head of list of nodes
	inline void insert(struct node_head* head) {
		LIST_INSERT_HEAD(head, this, entry);
	}
	inline Node* nextnode() { return entry.le_next; }

	// The remaining objects handle a (static) linked list of nodes
	// Used by Tom's satallite code and the wireless code
	inline const struct if_head& ifhead() const { return ifhead_; }
	inline const struct linklist_head& linklisthead() const { 
		return linklisthead_; 
	}
	
	//neighbor list maintenance
	neighbor_list_node* neighbor_list_;
	void addNeighbor(Node *node);
	
	static Node* get_node_by_address(nsaddr_t);
	
	//routines for supporting routing
	void route_notify (RoutingModule *rtm);
	void unreg_route_notify(RoutingModule *rtm);
	void add_route (char *dst, NsObject *target);
	void delete_route (char *dst, NsObject *nullagent);
	void set_table_size(int nn);
	void set_table_size(int level, int csize);

protected:
	LIST_ENTRY(Node) entry;  // declare list entry structure
	int address_;
	int nodeid_; 		 // for nam use

	// Nam tracing facility
        Tcl_Channel namChan_;
	// Single thread ns, so we can use one global storage for all 
	// node objects
	static char nwrk_[NODE_NAMLOG_BUFSZ];	
	void namdump();

	struct if_head ifhead_; // list of phys for this node
	struct linklist_head linklisthead_; // list of link heads on node

	// pointer to head of rtmodule chain
	RoutingModule* rtnotif_;

#ifdef HAVE_STL
	NixNode* nixnode_;   // used for nix routing (on-demand source routing for simulator performance)
#endif /* STL */

public:
	// XXX Energy related stuff. Should be moved later to a wireless 
	// routing plugin module instead of sitting here.
	inline EnergyModel* energy_model() { return energy_model_; }
	inline Location* location() { return location_; }
protected:
	EnergyModel* energy_model_;
	// XXX Currently this is a placeholder only. It is supposed to 
	// hold the position-related stuff in MobileNode. Yet another 
	// 'Under Construction' sign :(
	Location* location_;
};

#endif /* __ns_node_h__ */