/**********************************************************************
 *
 * browsetools.cpp -- 
 * Copyright (C) 1999  The New Zealand Digital Library Project
 *
 * A component of the Greenstone digital library software
 * from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: browsetools.cpp 649 1999-10-10 08:14:12Z sjboddie $
 *
 *********************************************************************/

/*
   $Log$
   Revision 1.25  1999/10/10 08:14:04  sjboddie
   - metadata now returns mp rather than array
   - redesigned browsing support (although it's not finished so
   won't currently work ;-)

   Revision 1.24  1999/09/28 01:46:55  rjmcnab
   removed some unused stuff

   Revision 1.23  1999/09/23 10:09:17  sjboddie
   made some changes so AZLists within other classifications are
   handled properly

   Revision 1.22  1999/09/07 23:06:58  rjmcnab
   removed some compiler warnings.

   Revision 1.21  1999/09/07 04:56:52  sjboddie
   added GPL notice

   Revision 1.20  1999/08/25 04:46:58  sjboddie
   fixed bug

   Revision 1.19  1999/08/13 04:18:04  sjboddie
   fixed some typos

   Revision 1.18  1999/08/10 22:42:21  sjboddie
   added more format options to document tocs - there are now just two
   types of toc - standard (Hierarchical) and document (as in books)

   Revision 1.17  1999/08/09 02:12:07  sjboddie
   made it so dates may be only 4 digits (i.e. year only)

   Revision 1.16  1999/07/30 02:16:10  sjboddie
   -added ability to display nested classifications (expanded versions
   of nested classifications has yet to be done).
   -changed set_arrow_macros slightly to fit in with new showtoppage
   format option

   Revision 1.15  1999/07/21 05:01:56  sjboddie
   wrote handler for DateList classification

   Revision 1.14  1999/07/20 02:58:15  sjboddie
   got List and AZList classifications using format strings - tidied
   up a bit

   Revision 1.13  1999/07/07 05:44:25  sjboddie
   Made some changes to allow for new way classifiers work (i.e. you can
   now have classifiers containing other classifiers). At present there's
   only a special case for dealing with the hdl 'magazine' section. A bit
   of a redesign is needed to get it completely flexible

   Revision 1.12  1999/07/01 03:47:49  rjmcnab
   Fixed a small warning.

   Revision 1.11  1999/06/27 21:49:01  sjboddie
   fixed a couple of version conflicts - tidied up some small things

   Revision 1.10  1999/06/26 01:07:21  rjmcnab
   Fixed a small "bug" -- well I probably just covered another one...

   Revision 1.9  1999/06/24 05:12:15  sjboddie
   lots of small changes

   Revision 1.8  1999/06/17 03:06:53  sjboddie
   got detach button working properly - the close book icon is now disabled
   when page is detached as the javascript close() function I was using is
   too unreliable over different browsers
   note that in my last comment I meant the "cl" arg (not the "c" arg).

   Revision 1.7  1999/06/16 23:53:14  sjboddie
   tidied a few things up. documentaction::define_external_macros now
   resets the "c" arg if it's set to something stupid by the .xx suffixes

   Revision 1.6  1999/06/16 04:03:47  sjboddie
   Now sets "cl" arg to "search" when going to a document from a search
   results page. This allows the close book icon (in hierarchy toc) to
   take you back to the results page if that's where you came from.
   If you got to the document page somehow other than from a
   classification or a search (i.e. if "cl" isn't set) then the close
   book icon is disabled

   Revision 1.5  1999/06/16 03:11:25  sjboddie
   get_info() now takes a getParents argument

   Revision 1.4  1999/05/10 03:40:26  sjboddie
   lots of changes - slowly getting document action sorted out

   Revision 1.3  1999/04/30 01:59:39  sjboddie
   lots of stuff - getting documentaction working (documentaction replaces
   old browseaction)

   Revision 1.2  1999/03/29 02:14:29  sjboddie

   More changes to browseaction

   Revision 1.1  1999/03/25 03:10:15  sjboddie

   new library for browse stuff

 */

#include "browsetools.h"
#include "OIDtools.h"


// simply checks to see if formatstring begins with a <td> tag
static bool is_table_content (const text_t &formatstring) {
  text_t::const_iterator here = formatstring.begin();
  text_t::const_iterator end = formatstring.end();
  
  while (here != end) {
    if (*here != ' ') {
      if (*here == '<') {
	if ((*(here+1) == 't' || *(here+1) == 'T') &&
	    (*(here+2) == 'd' || *(here+2) == 'D') &&
	    (*(here+3) == '>' || *(here+3) == ' '))
	  return true;
      } else return false;
    }
    here ++;
  }
  return false;
}

static bool is_table_content (const format_t *formatlistptr) {

  if (formatlistptr == NULL) return false;
  
  if (formatlistptr->command == comText)
    return is_table_content (formatlistptr->text);
    
  return false;
}

// expects haschidren, doctype, and classifytype metadata elements
static void recurse_contents (ResultDocInfo_t &section, cgiargsclass &args,
			      browserclass *bptr, text_tset &metadata, bool &getParents, 
			      format_t *formatlistptr, format_tmap &formatlistmap, 
			      formatinfo_t &formatinfo, browsermapclass *browsermap, 
			      int colnumber, recptproto *collectproto, displayclass &disp, 
			      outconvertclass &outconvert, ostream &textout, ostream &logout) {
  text_t formatstring;

  bool is_classify = false;
  if (args["d"].empty()) is_classify = true;

  // output this section 
  bool use_table = is_table_content (formatlistptr);
  colnumber += bptr->output_section_group (section, args, colnumber, formatlistptr, 
					   use_table, disp, outconvert, textout, logout);

  text_t classification;
  if (!is_classify) classification = "Document";
  else get_top (section.OID, classification);

  int haschildren = section.metadata["haschildren"].values[0].getint();
  const text_t &doctype = section.metadata["doctype"].values[0];
  text_t classifytype = section.metadata["classifytype"].values[0];
  // HLists are displayed as VLists when contents are expanded,
  // Books are displayed as HLists
  if (classifytype == "HList") classifytype = "VList";
  if (classifytype == "Book") classifytype = "HList";

  // recurse through children
  if ((haschildren == 1) && ((!is_classify) || (doctype == "classify"))) {

    // get browser for displaying children
    bptr = browsermap->getbrowser (classifytype);
    bptr->load_metadata_defaults (metadata);

    // get the formatstring if there is one 
    if (!get_formatstring (classification, classifytype, 
			   formatinfo.formatstrings, formatstring))
      formatstring = bptr->get_default_formatstring();

    format_tmap::const_iterator it = formatlistmap.find (formatstring);
    // check if formatlistptr is cached
    if (it != formatlistmap.end()) formatlistptr = (*it).second;
    else {
      formatlistptr = new format_t();
      parse_formatstring (formatstring, formatlistptr, metadata, getParents);
      formatlistmap[formatstring] = formatlistptr;
    }

    FilterResponse_t tmp;
    get_children (section.OID, args["c"], metadata, getParents, collectproto, tmp, logout);
    ResultDocInfo_tarray::iterator thisdoc = tmp.docInfo.begin();
    ResultDocInfo_tarray::iterator lastdoc = tmp.docInfo.end();

    while (thisdoc != lastdoc) {
      recurse_contents (*thisdoc, args, bptr, metadata, getParents, 
			formatlistptr, formatlistmap, formatinfo, browsermap, 
			colnumber, collectproto, disp, outconvert, textout, logout);
      thisdoc ++;
    }
  }
}


// expanded_contents recurses through all contents. there's a special case
// for an HList when contents are expanded (i.e. it's displayed as a VList)
//
// if we're inside a document we expand all contents from the top,
// if we're at classification level we'll just expand out those contents below 
// the current one

static void expanded_contents (cgiargsclass &args, browsermapclass *browsermap, 
			       formatinfo_t &formatinfo, recptproto *collectproto, 
			       displayclass &disp, outconvertclass &outconvert, 
			       ostream &textout, ostream &logout) {
  
  if (args["d"].empty() && args["cl"].empty()) return;
  text_t OID;
  
  FilterResponse_t response;
  bool getParents = false;
  text_tset metadata;
  text_t classifytype, classification, formatstring;
  int colnumber = 0;

  if (!args["d"].empty()) {
    // document level - expand from top
    get_top (args["d"], OID);
    classification = "Document";
  } else {
    // classification level
    OID = args["cl"];
    get_top (args["cl"], classification);
  }

  // get classifytype of this level
  text_t tOID;
  if (is_top(OID)) {
    classifytype = "thistype";
    tOID = OID;
  } else {
    classifytype = "childtype";
    tOID = get_parent (OID);
  }
  metadata.insert (classifytype);

  if (!get_info (tOID, args["c"], metadata, getParents, collectproto, response, logout))
    return;
  classifytype = response.docInfo[0].metadata[classifytype].values[0];
  // if we still don't have a classifytype we'll use the default
  if (classifytype.empty()) {
    browserclass *bptr = browsermap->get_default_browser ();
    classifytype = bptr->get_browser_name ();
  }

  // HLists are displayed as VLists when contents are expanded,
  // Books are displayed as HLists
  if (classifytype == "HList") classifytype = "VList";
  if (classifytype == "Book") classifytype = "HList";

  metadata.erase (metadata.begin(), metadata.end());
		  
  // metadata elements needed by recurse_contents
  metadata.insert ("classifytype");
  metadata.insert ("doctype");
  metadata.insert ("haschildren");

  // load up metadata array with browser defaults
  browserclass *bptr = browsermap->getbrowser (classifytype);
  bptr->load_metadata_defaults (metadata);

  // get the formatstring if there is one or use the browsers default
  if (!get_formatstring (classification, classifytype, 
			 formatinfo.formatstrings, formatstring))
    formatstring = bptr->get_default_formatstring();

  format_t *formatlistptr = new format_t();
  parse_formatstring (formatstring, formatlistptr, metadata, getParents);

  // protocol call
  if (!get_info (OID, args["c"], metadata, getParents, collectproto, response, logout))
    return;

  format_tmap formatlistmap;
  formatlistmap[formatstring] = formatlistptr;

  recurse_contents (response.docInfo[0], args, bptr, metadata, 
		    getParents, formatlistptr, formatlistmap, formatinfo, browsermap, 
		    colnumber, collectproto, disp, outconvert, textout, logout);

  // clean up format list pointers
  format_tmap::const_iterator here = formatlistmap.begin();
  format_tmap::const_iterator end = formatlistmap.end();
  while (here != end) {
    delete (*here).second;
    here ++;
  }
}

static void load_formatstring (const text_t &classifytype, text_tset &metadata,
			       bool &getParents, const text_t &classification, 
			       browsermapclass *browsermap, formatinfo_t &formatinfo,
			       format_tmap &formatlistmap) {
  text_t formatstring;

  // load up metadata array with browser defaults
  browserclass *bptr = browsermap->getbrowser (classifytype);
  bptr->load_metadata_defaults (metadata);

  // get the formatstring if there is one or use the browsers default
  if (!get_formatstring (classification, classifytype, 
			 formatinfo.formatstrings, formatstring))
    formatstring = bptr->get_default_formatstring();

  // see if it's cached
  format_tmap::const_iterator it = formatlistmap.find (formatstring);
  if (it == formatlistmap.end()) {
    format_t *formatlistptr = new format_t();
    parse_formatstring (formatstring, formatlistptr, metadata, getParents);
    formatlistmap[formatstring] = formatlistptr;
  }
}

static void load_formatstrings (FilterResponse_t &response, text_tset &metadata,
				bool &getParents, const text_t &classification,
				browsermapclass *browsermap, formatinfo_t &formatinfo, 
				format_tmap &formatlistmap) {

  text_tset cache;

  ResultDocInfo_tarray::iterator thisdoc = response.docInfo.begin();
  ResultDocInfo_tarray::iterator lastdoc = response.docInfo.end();

  while (thisdoc != lastdoc) {
    if (classification != "Document" && is_top ((*thisdoc).OID)) {
      text_t &thistype = (*thisdoc).metadata["thistype"].values[0];
      if (!thistype.empty()) load_formatstring (thistype, metadata, getParents, classification,
						browsermap, formatinfo, formatlistmap);
    }
    text_t &childtype = (*thisdoc).metadata["childtype"].values[0];
    text_tset::const_iterator it = cache.find (childtype);
    if (it == cache.end()) {
      if (!childtype.empty()) {
	load_formatstring (childtype, metadata, getParents, classification,
			   browsermap, formatinfo, formatlistmap);
	cache.insert (childtype);
      }
    }
    thisdoc ++;
  }
}


static void contracted_contents (cgiargsclass &args, browsermapclass *browsermap,
				 formatinfo_t &formatinfo, recptproto *collectproto,
				 displayclass &disp, outconvertclass &outconvert,
				 ostream &textout, ostream &logout) {
  FilterResponse_t response;
  text_tset metadata;
  bool getParents = false;
  text_tarray parents;
  text_t OID = args["d"];
  if (OID.empty()) OID = args["d"];
  text_t classification = "Document";
  if (args["d"].empty()) get_top (args["cl"], classification);

  bool haschildren = has_children (OID, args["c"], collectproto, logout);

  if (haschildren) get_parents_array (OID + ".fc", parents);
  else get_parents_array (OID, parents);

  // get classifytypes of each parent
  metadata.insert ("thistype");
  metadata.insert ("childtype");
  if (!get_info (parents, args["c"], metadata, getParents, collectproto, response, logout))
    return;
  
  metadata.erase (metadata.begin(), metadata.end());

  // get formatstrings for all parents
  format_tmap formatlistmap;  
  load_formatstrings (response, metadata, getParents, classification, 
		      browsermap, formatinfo, formatlistmap);

  ///////////////////

}

void output_toc (cgiargsclass &args, browsermapclass *browsermap,
                 formatinfo_t &formatinfo, recptproto *collectproto,
                 displayclass &disp, outconvertclass &outconvert,
                 ostream &textout, ostream &logout) {

  if (args.getintarg("gc") == 1) {

    // expanded table of contents
    expanded_contents (args, browsermap, formatinfo, collectproto, 
		       disp, outconvert, textout, logout);
  } else {

    // contracted table of contents
    contracted_contents (args, browsermap, formatinfo, collectproto, 
			 disp, outconvert, textout, logout);

  }
}