/**********************************************************************
 *
 * receptionist.h -- a web interface for the gsdl
 * Copyright (C) 1999  The New Zealand Digital Library Project
 *
 * PUT COPYRIGHT NOTICE HERE
 *
 * $Id: receptionist.h 159 1999-02-11 23:07:00Z sjboddie $
 *
 *********************************************************************/


#ifndef RECEPTIONIST_H
#define RECEPTIONIST_H

#include "gsdlconf.h"
#include "text_t.h"
#include "cgiargs.h"
#include "display.h"
#include "action.h"

#ifndef MACROPRECEDENCE
#define MACROPRECEDENCE "style,collection,queryversion,version,language"
#endif


class receptionist {
public:
  receptionist () {}
  virtual ~receptionist() {}

  // this version of set_gsdlhome should be used if the receptionist
  // is being run for multiple collections ("general" mode).
  void set_gsdlhome (const text_t &thegsdlhome);
  text_t get_gsdlhome () {return gsdlhome;}

  // this version of set_gsdlhome should be used if the receptionist
  // is being run for a single collection ("collection specific" mode).
  void set_gsdlhome (const text_t &thegsdlhome, const text_t &thecollection);
  text_t get_collection () {return collection;}

  // sets the http address of the images directory. This is used to
  // speed up the access to the images which are a part of the general
  // interface. If this is not set the interface will have to get the
  // images via gwcgi which will be a lot slower (especially if the
  // browser does not cache the images).
  void set_httpimg (const text_t &thehttpimg) {httpimg=thehttpimg;}
  text_t get_httpimg () {return httpimg;}

  // sets the http address of the gateway cgi program (ie. the program
  // that contains this receptionist).
  void set_gwcgi (const text_t &thegwcgi) {gwcgi=thegwcgi;}
  text_t get_gwcgi () {return gwcgi;}

  // set_macrofiles defines the macro files which will be read when
  // the init function is called.
  void set_macrofiles (const text_tarray &themacrofiles) {macrofiles=themacrofiles;}
  text_tarray get_macrofiles () {return macrofiles;}

  // set_saveconf defines what should be included in the compressed
  // arguments. This string should consist of cgi argument names
  // seperated by "-".
  void set_saveconf (const text_t &thesaveconf) {saveconf=thesaveconf;}
  text_t get_saveconf () {return saveconf;}

  // add_action makes another action available to the receptionist
  // the action becomes the property of the receptionist
  void add_action (action *theaction) {actions.addaction(theaction);}

  // configure_actions should be called for each line in the
  // configuration files to configure the actions. The configuration
  // should take place after all the actions have been added.
  void configure_actions (const text_t &key, const text_tarray &cfgline);

  // init should be called after setgsdhome has been called.
  // It returns true on success and false on failure. If false is
  // returned getpage should not be called (without producing
  // meaningless output), instead an error page should be
  // produced by the calling code.
  bool init (ostream &logout);
  
  // There are two ways to produce a page. You can either call parse_cgi_args,
  // get_cgihead_info, and produce_content or you can just call parse_cgi_args and
  // produce_cgi_page (which will be satisfactory in most cases). You might want to call
  // parse_cgi_args, get_cgihead_info, and produce_content when you want to
  // interface directly with a web server for which the standard header is inappropriate.

  // parse_cgi_args parses cgi arguments into an argument class.
  // This function should be called for each page request. It returns false
  // if there was a major problem with the cgi arguments.
  bool parse_cgi_args (const text_t &argstr, cgiargsclass &args, ostream &logout);

  // produce_cgi_page will call get_cgihead_info and 
  // produce_content in the appropriate way to output a cgi header and
  // the page content (if needed). If a page could not be created it
  // will return false
  bool produce_cgi_page (cgiargsclass &args, ostream &contentout, 
				     ostream &logout);

  // get_cgihead_info determines the cgi header information for
  // a set of cgi arguments. If response contains location then
  // response_data contains the redirect address. If reponse
  // contains content then reponse_data contains the content-type.
  // Note that images can now be produced by the receptionist.
  void get_cgihead_info (cgiargsclass &args, response_t &response,
			 text_t &response_data, ostream &logout);

  // produce the page content
  bool produce_content (cgiargsclass &args, ostream &contentout,
			ostream &logout);

  // returns the compressed argument ("e") corresponding to the argument
  // list. This can be used to save preferences between sessions.
  text_t get_compressed_arg (const cgiargsclass &args);

  // returns a pointer to the action list
  actionmapclass *get_actionmap_ptr () {return &actions;}

protected:
  text_t gsdlhome;
  text_t collectdir; // will equal gsdlhome in 'general' mode
  text_t collection; // will equal "" in 'general' mode
  text_t httpimg;
  text_t gwcgi;

  displayclass disp;
  text_tarray macrofiles;

  text_t saveconf;
  cgiargsinfoclass argsinfo;
  actionmapclass actions;

  // will read in all the macro files. If one is not found an
  // error message will be written to logout and the method will
  // return false.
  bool read_macrofiles (ostream &logout);
  
  // Will define the main general arguments used by the receptionist.
  // If an error occurs a message will be written to logout and the
  // method will return false.
  virtual bool define_mainargs (ostream &logout);

  // check_mainargs will check all the main arguments. If a major
  // error is found it will return false and no cgi page should
  // be created using the arguments.
  virtual bool check_mainargs (cgiargsclass &args, ostream &logout);
};


#endif