/**********************************************************************
 *
 * collectset.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.
 *
 *********************************************************************/


#include "collectset.h"
#include "collectserver.h"
#include "colservrconfig.h"
#include "gsdlsitecfg.h"
#include "gdbmclass.h"
#include "fileutil.h"
#include "filter.h"
#include "browsefilter.h"
#include "sqlbrowsefilter.h"
#include "queryfilter.h"
#include "mgqueryfilter.h"
#include "mgppqueryfilter.h"
#include "mgsource.h"
#include "lucenequeryfilter.h"
#include "lucenesource.h"

#include <assert.h>

#ifdef USE_SQLITE
#include "sqlitedbclass.h"
#endif


collectset::collectset (text_t &gsdlhome) {

  text_tarray collections;
  text_t      collectdir;

  // get gsdlhome (if we fail the error will be picked up later -- in
  // cgiwrapper)

  if (site_cfg_read (gsdlhome, httpdomain, httpprefix)) {
    if (!gsdlhome.empty() && directory_exists(gsdlhome)) {
      collectdir = filename_cat (gsdlhome, "collect");
      if (read_dir (collectdir, collections)) {
    
	text_tarray::const_iterator thiscol = collections.begin();
	text_tarray::const_iterator endcol = collections.end();

	while (thiscol != endcol) {
	  // ignore the modelcol
	  if (*thiscol == "modelcol") {
	    ++thiscol;
	    continue;
	  }

	  this->add_collection (*thiscol, gsdlhome);

	  ++thiscol;
	}

	this->add_all_collection_groups(gsdlhome);
      }
    }
  }
}

collectset::~collectset () {
  collectservermapclass::iterator here = cservers.begin();
  collectservermapclass::iterator end = cservers.end();

  while (here != end) {
    if ((*here).second.c != NULL) {
      delete (*here).second.c;
    }
    ++here;
  }
  cservers.clear();
}

bool collectset::init (ostream &logout) {
  collectservermapclass::iterator here = cservers.begin();
  collectservermapclass::iterator end = cservers.end();

  while (here != end) {
    assert ((*here).second.c != NULL);
    if ((*here).second.c != NULL) {
      const colservrconf &configinfo = (*here).second.c->get_configinfo ();

      // configure this collection server

      // note that we read build.cfg before collect.cfg so that the indexmaps
      // are available to decode defaultindex, defaultsubcollection, and
      // defaultlanguage

      bool failed_build_cfg = false;
      if (!build_cfg_read (*((*here).second.c), configinfo.gsdlhome,
			   configinfo.collection)) {
	failed_build_cfg = true;

	outconvertclass text_t2ascii;
	logout << text_t2ascii 
	       << "Warning: couldn't read build.cfg file for collection \"" //****
	       << configinfo.collection << "\", gsdlhome=\""
	       << configinfo.gsdlhome << "\"\n";
      }

      bool failed_collect_cfg = false;
      if (!collect_cfg_read (*((*here).second.c), configinfo.gsdlhome,
			     configinfo.collection)) {
	failed_collect_cfg = true;
	outconvertclass text_t2ascii;
	logout << text_t2ascii 
	       << "Warning: couldn't read collect.cfg file for collection \""
	       << configinfo.collection << "\", gsdlhome=\"" 
	       << configinfo.gsdlhome << "\"\n";
      }

      
      bool is_colgroup = (*here).second.c->is_collection_group();

      if (failed_collect_cfg) {
	++here;
	continue;
      }

      if (failed_build_cfg && (!is_colgroup)) {
	++here;
	continue;
      }
      // let a failed build.cfg through if its 'collect.cfg' marks it as 'collectgroup true'

      if (!(*here).second.c->init (logout)) return false;

      (*here).second.c->configure("httpdomain",httpdomain);
      (*here).second.c->configure("httpprefix",httpprefix);
    }
    ++here;
  }

  return true;
}

collectservermapclass collectset::servers()
{ return cservers;
}


void collectset::add_all_collections(const text_t &gsdlhome) {

  text_tarray collections;
  text_t collectdir = filename_cat(gsdlhome, "collect");
  if (read_dir(collectdir, collections)) {

    text_tarray::const_iterator thiscol = collections.begin();
    text_tarray::const_iterator endcol = collections.end();

    while (thiscol != endcol) {
    
      // ignore the modelcol
      if (*thiscol == "modelcol") {
	++thiscol;
	continue;
      }
    
      // create collection server for this collection
      this->add_collection (*thiscol, gsdlhome);
    
      ++thiscol;
    }

    this->add_all_collection_groups(gsdlhome);
  }
}

// add_collection sets up the collectionserver and calls
// add_collectserver
void collectset::add_collection (const text_t &collection, 
				 const text_t &gsdlhome) {

  this->remove_collection(collection);
  
  // read config file to see if built with mg, mgpp, or lucene
  text_t buildtype = "mg"; // mg is default
  text_t infodbtype = "gdbm"; // gdbm is default

  text_tarray cfgline;
  text_t key;
  text_t build_cfg = filename_cat(gsdlhome, "collect", collection, "index", "build.cfg");
  char *build_cfgc = build_cfg.getcstr();
  ifstream confin(build_cfgc);

  if (confin) {
    while (read_cfg_line(confin, cfgline) >= 0) {
      if (cfgline.size() == 2) {
	key = cfgline[0];
	cfgline.erase(cfgline.begin());
	if (key == "buildtype") {
	  buildtype = cfgline[0];
	}
	if (key == "infodbtype") {
	  infodbtype = cfgline[0];
	}
      }
    }
    confin.close();
  }
  delete []build_cfgc;

  collectserver *cserver = new collectserver();

  // Create a dbclass of the correct type
  dbclass *db_ptr = NULL;

#ifdef USE_SQLITE
  if (infodbtype == "sqlite")
  {
    sqlitedbclass *sql_db_ptr = new sqlitedbclass();
    db_ptr = sql_db_ptr;

    // add a sql browse filter
    sqlbrowsefilterclass *sqlbrowsefilter = new sqlbrowsefilterclass();
    sqlbrowsefilter->set_sql_db_ptr(sql_db_ptr);
    cserver->add_filter (sqlbrowsefilter);  
  }
#endif

  // Use GDBM if the infodb type is empty or not one of the values above
  if (db_ptr == NULL)
  {
    db_ptr = new gdbmclass();
  }

  // add a null filter
  filterclass *filter = new filterclass ();
  cserver->add_filter (filter);
      
  // add a browse filter
  browsefilterclass *browsefilter = new browsefilterclass();
  browsefilter->set_db_ptr(db_ptr);
  cserver->add_filter (browsefilter);  
 
  if (buildtype == "mg") {
    mgsearch = new mgsearchclass();
 
    // add a query filter
    mgqueryfilterclass *queryfilter = new mgqueryfilterclass();
    queryfilter->set_db_ptr(db_ptr);
    queryfilter->set_textsearchptr (mgsearch);
    cserver->add_filter (queryfilter);
    
    // add a mg source
    mgsourceclass *mgsource = new mgsourceclass ();
    mgsource->set_db_ptr(db_ptr);
    mgsource->set_textsearchptr (mgsearch);
    cserver->add_source (mgsource);
  }
  else if (buildtype == "mgpp") {
    mgppsearch = new mgppsearchclass();

    // add a query filter
    mgppqueryfilterclass *queryfilter = new mgppqueryfilterclass();
    queryfilter->set_db_ptr(db_ptr);
    queryfilter->set_textsearchptr (mgppsearch);
    cserver->add_filter (queryfilter);
      
    // add a mg source
    mgsourceclass *mgsource = new mgsourceclass ();
    mgsource->set_db_ptr(db_ptr);
    mgsource->set_textsearchptr (mgppsearch);
    cserver->add_source (mgsource);
  }
  else if (buildtype == "lucene") {
    lucenesearch = new lucenesearchclass();
    lucenesearch->set_gsdlhome(gsdlhome);

    // add a query filter
    lucenequeryfilterclass *queryfilter = new lucenequeryfilterclass();
    queryfilter->set_db_ptr(db_ptr);
    queryfilter->set_textsearchptr (lucenesearch);
    cserver->add_filter (queryfilter);
      
    // add a lucene source
    lucenesourceclass *lucenesource = new lucenesourceclass ();
    lucenesource->set_db_ptr(db_ptr);
    lucenesource->set_textsearchptr (lucenesearch);
    cserver->add_source (lucenesource);
  }

  // inform collection server and everything it contains about its
  // collection name
  cserver->configure ("collection", collection);
  cserver->configure ("gsdlhome", gsdlhome);

  cservers.addcollectserver (cserver);
}

void collectset::remove_all_collections () {

  // first unload any cached mg databases
  if (mgsearch != NULL) {
    mgsearch->unload_database();
  }

  // now delete the collection server objects
  collectservermapclass::iterator here = cservers.begin();
  collectservermapclass::iterator end = cservers.end();

  while (here != end) {
    if ((*here).second.c != NULL) {
      delete (*here).second.c;
    }
    ++here;
  }
  cservers.clear();
}

void collectset::add_collection_group(const text_t& collection, 
				      const text_t& gsdlhome)
{
  text_tarray group;
  text_t collect_group_dir = filename_cat (gsdlhome, "collect", collection);

  // need to read collect.cfg for 'collectgroup' as class hasn't been initialised through 'init' yet
  text_t is_collect_group;
  text_tarray cfgline;
  text_t key;
  text_t build_cfg = filename_cat(gsdlhome, "collect", collection, "etc", "collect.cfg");
  char *collect_cfgc = build_cfg.getcstr();
  ifstream confin(collect_cfgc);

  if (confin) {
    while (read_cfg_line(confin, cfgline) >= 0) {
      if (cfgline.size() == 2) {
	key = cfgline[0];
	cfgline.erase(cfgline.begin());
	if (key == "collectgroup") {
	  is_collect_group = cfgline[0];
	  break;
	}
      }
    }
    confin.close();
  }
  delete []collect_cfgc;

  if (is_collect_group == "true") {

    if (read_dir (collect_group_dir, group)) {
      
      text_tarray::const_iterator thiscol = group.begin();
      text_tarray::const_iterator endcol = group.end();
      
      while (thiscol != endcol) {
	// ignore the modelcol
	if (*thiscol == "etc") {
	  ++thiscol;
	  continue;
	}
	
	this->add_collection (collection + "/" + *thiscol, gsdlhome);
	
	++thiscol;
      }
    }
  }
}

void collectset::add_all_collection_groups (const text_t& gsdlhome) 

{
  collectservermapclass::iterator here = cservers.begin();
  collectservermapclass::iterator end = cservers.end();
  
  while (here != end) {
    text_t collection = (*here).second.c->get_collection_name();
    this->add_collection_group(collection,gsdlhome);

    ++here;
  }
}


// remove_collection deletes the collection server of collection.
// This only needs to be called if a collectionserver is to be
// removed while the library is running. The destructor function
// cleans up all collectservers when the program exits.
void collectset::remove_collection (const text_t &collection) {

  // do nothing if no collection server exists for this collection 
  if (cservers.getcollectserver(collection) == NULL) return;

  // first unload any cached mg databases - we may need to do something
  // similar to this for mgpp and lucene too
  if (mgsearch != NULL) {
    mgsearch->unload_database();
  }

  // now delete the collection server object
  collectservermapclass::iterator here = cservers.begin();
  collectservermapclass::iterator end = cservers.end();

  while (here != end) {
    if ((*here).second.c != NULL && (*here).first == collection) {
      delete (*here).second.c;
      cservers.erase (here);
      return;
    }
    ++here;
  }
}


// remove_collection deletes the collection server of collection.
// This only needs to be called if a collectionserver is to be
// removed while the library is running. The destructor function
// cleans up all collectservers when the program exits.
void collectset::remove_collection (const text_t &collection, ostream &logout) {

  remove_collection(collection);

  outconvertclass text_t2ascii;
  logout << text_t2ascii << "collectset::remove_collection: failed to remove collectserver for "
	 << collection << "\n";
}

void collectset::configure(const text_t &key, const text_tarray &cfgline)
{
  if (key == "collection" || key == "collectdir") return;

  collectservermapclass::iterator here = cservers.begin();
  collectservermapclass::iterator end = cservers.end();

  while (here != end) {
    assert ((*here).second.c != NULL);
    if ((*here).second.c != NULL) {
      if (key == "collectinfo") {
	if ((*here).first == cfgline[0]) {
	  (*here).second.c->configure ("gsdlhome", cfgline[1]);
	  (*here).second.c->configure ("gdbmhome", cfgline[2]);
	}
      } else {
	(*here).second.c->configure (key, cfgline);
      }
    }

    ++here;
  }
}

void collectset::getCollectionList (text_tarray &collist) 
{
  collist.erase(collist.begin(),collist.end());

  collectservermapclass::iterator here = cservers.begin();
  collectservermapclass::iterator end = cservers.end();
  while (here != end) {
    assert ((*here).second.c != NULL);
    if ((*here).second.c != NULL) {
      collist.push_back ((*here).second.c->get_collection_name());
    }
    ++here;
  }
}