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#ifndef __EST_SERVICETABLE_H__
#define __EST_SERVICETABLE_H__

#include "EST_String.h"
#include "EST_rw_status.h"
#include "EST_TKVL.h"

/** A global table of known services. Used for fringe and festival
  * servers.
  * 
  * @author Richard Caley <rjc@cstr.ed.ac.uk>
  * @version $Id: EST_ServiceTable.h,v 1.2 2001/04/04 13:11:27 awb Exp $
  */

class EST_ServiceTable {


public:
  /** A service record.  
    *
    * This is returned by service lookup operations, it contains
    * enough information to contact the server and authenticate yourself.
    */

  class Entry
  {
  public:
    /// Name of the server.
    EST_String name;
    /// Type of server (eg `fringe')
    EST_String type;
    /// Human readable hostname.
    EST_String hostname;
    /// Numeric IP address (###.###.###.###)
    EST_String address;
    /// A random string to send as authorisation.
    EST_String cookie;
    /// TCP port number.
    int port;

    /// Create an empty entry.
    Entry();

    /// A suitable human readable name for the entry.
    operator EST_String() const;
    
    /// All entries are taken to be different.
    friend bool operator == (const Entry &a, const Entry &b);

    /// Print in human readable form.
    friend ostream & operator << (ostream &s, const Entry &a);
  };

private:

  class EntryTable 
	{
	public:
        EST_TKVL<EST_String, Entry> t; 
        typedef EST_TKVL<EST_String, Entry>::Entries Entries;
        typedef EST_TKVL<EST_String, Entry>::KeyEntries KeyEntries;
	};

  /// Table of available Fringe servers.
  static EntryTable entries;

  static bool random_init;
  static void init_random(void);

public:

  /**@name Finding What Services Are Available.
    *
    * Servers maintain a per-user file which lists the  processes
    * which are running in server mode by name. These functions read
    * that table.  */
  //@{

  /// Read the users default table. <filename>~/.estServices</filename>
  static void read_table(void);
  /// Read a specific table.
  static void read_table(EST_String socketsFileName);
  /// Write the users default table. <filename>~/.estServices</filename>
  static void write_table(void);
  /// Write a specific table.
  static void write_table(EST_String socketsFileName);
  /// List the table to given stream
  static void list(ostream &s, const EST_String type);
  /// Return a list of server names.
  static void names(EST_TList<EST_String> &names, const EST_String type="");

  //@}

  /** Return the entry for the server with the given name and type.
    * If no such entry is found a dummy entry with a port of 0 is returned.
    */
  static const Entry &lookup(const EST_String name, 
			     const EST_String type);

  /** Create an entry for a server of the given name and type which is
    * listening on the given socket.
    */
  static const Entry &create(const EST_String name, 
			     const EST_String type,
			     int socket);

};

#endif