###########################################################################
#
# buildConfigxml.pm --
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 1999 New Zealand Digital Library Project
#
# 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.
#
###########################################################################

# reads in buildConfig.xml 
# Note, only implemented the bits that are currently used, eg by incremental 
# build code.
# The resulting data is not a full representation on buildConfig.xml.

package buildConfigxml;

use strict;
no strict 'refs';
no strict 'subs';

# Wrapper that ensures the right version of XML::Parser is loaded given
# the version of Perl being used.  Need to distinguish between Perl 5.6 and
# Perl 5.8
sub BEGIN {
    my $perl_dir;

    # Note: $] encodes the version number of perl
    if ($]>=5.010) { 
	$perl_dir = "perl-5.10";
    }
    elsif ($]>5.008) { 
	# perl 5.8.1 or above
	$perl_dir = "perl-5.8";
    }
    elsif ($]<5.008) {
	# assume perl 5.6
	$perl_dir = "perl-5.6";
    }
    else {
	print STDERR "Warning: Perl 5.8.0 is not a maintained release.\n";
	print STDERR "         Please upgrade to a newer version of Perl.\n";
	$perl_dir = "perl-5.8";
    }

    if ($ENV{'GSDLOS'} !~ /^windows$/i) {
	# Use push to put this on the end, so an existing XML::Parser will be used by default
	push (@INC, "$ENV{'GSDLHOME'}/perllib/cpan/$perl_dir");
    }
}

use XML::Parser;


# A mapping hash to resolve name discrepancy between gs2 and gs3.
my $nameMap = {"numDocs" => "numdocs",
	       "buildType" => "buildtype"
	       };


# A hash structure which is returned by sub read_cfg_file.
my $data = {};

# use those unique attribute values to locate the text within the elements
my $currentLocation = "";
my $stringexp = q/^(buildType|numDocs)$/;
  
my $indexmap_name = "";
my $haveindexfields = 0;

# Reads in the model collection configuration file, collectionConfig.xml,
# into a structure which complies with the one used by gs2 (i.e. one read
# in by &cfgread::read_cfg_file).
sub read_cfg_file {
    my ($filename) = @_;
    $data = {};
    if ($filename !~ /buildConfig\.xml$/ || !-f $filename) {
        return undef;
    }

    # create XML::Parser object for parsing metadata.xml files
    my $parser;
    if ($]<5.008) {
	# Perl 5.6
	$parser = new XML::Parser('Style' => 'Stream',
				  'Handlers' => {'Char' => \&Char,
						 'Doctype' => \&Doctype
						 });
    }
    else {
	# Perl 5.8
	$parser = new XML::Parser('Style' => 'Stream',
				  'ProtocolEncoding' => 'ISO-8859-1',
				  'Handlers' => {'Char' => \&Char,
						 'Doctype' => \&Doctype
						 });
    }

    if (!open (COLCFG, $filename)) {
	print STDERR "buildConfigxml::read_cfg_file couldn't read the cfg file $filename\n";
    } else {

      $parser->parsefile ($filename);# (COLCFG);
      close (COLCFG);
    }

    #&Display; 
    return $data;
}

sub StartTag {
# Those marked with #@ will not be executed at the same time when this sub is being called
# so that if/elsif is used to avoid unnecessary tests
    my ($expat, $element) = @_;
    
    my $name = $_{'name'};
    my $shortname = $_{'shortname'};

    
    #@ handling block metadataList
    if (defined $name and $name =~ /$stringexp/){
      $currentLocation = $name;
      # the value will be retrieved later in Text sub
    }

    #@ handle indexes - store indexmap (mg) or indexfields and indexfieldmap (mgpp/lucene)
    elsif ($element =~ /^indexList$/) {
	# set up the data arrays
	# this assumes that the build type has been read already, which is
	# currently the order we save the file in.
	if ($data->{'buildtype'} eq "mg") {
	    $indexmap_name = "indexmap";
	    if (!defined $data->{"indexmap"}) {
		$data->{"indexmap"} = [];
	    }
	}
	else {
	    $indexmap_name = "indexfieldmap";
	    $haveindexfields = 1;
	    if (!defined $data->{"indexfieldmap"}) {
		$data->{"indexfieldmap"} = [];
	    }
	    if (!defined $data->{"indexfields"}) {
		$data->{"indexfields"} = [];
	    }

	}
	
    }
    
    elsif ($element =~ /index/) {
	# store each index in the map
	if (defined $name && defined $shortname) {
	    push @{$data->{$indexmap_name}}, "$name->$shortname";
	    if ($haveindexfields) {
		push @{$data->{'indexfields'}}, $name;
	    }
	}
    }


}

sub EndTag {
    my ($expat, $element) = @_;
}

sub Text {
    if (defined $currentLocation) { 
	#@ Handling block metadataList(numDocs, buildType)
	if($currentLocation =~ /$stringexp/){
	    #print $currentLocation;
	    my $key = $nameMap->{$currentLocation};	
	    $data->{$key} = $_;
	    undef $currentLocation;
	}	
    }	
}

# This sub is for debugging purposes
sub Display {

    print "NumDocs = ".$data->{'numdocs'}."\n" if (defined $data->{'numdocs'});
    print "BuildType = ".$data->{'buildtype'}."\n" if (defined $data->{'buildtype'});
    print  "IndexMap = ". join(" ",@{$data->{'indexmap'}})."\n" if (defined $data->{'indexmap'});
    print  "IndexFieldMap = ". join(" ",@{$data->{'indexfieldmap'}})."\n" if (defined $data->{'indexfieldmap'});
    print  "IndexFields = ". join(" ",@{$data->{'indexfields'}})."\n" if (defined $data->{'indexfields'});

}

# is this actually used??
sub Doctype {
    my ($expat, $name, $sysid, $pubid, $internal) = @_;

    die if ($name !~ /^buildConfig$/);
}

# This Char function overrides the one in XML::Parser::Stream to overcome a
# problem where $expat->{Text} is treated as the return value, slowing
# things down significantly in some cases.
sub Char {
    if ($]<5.008) {
	use bytes;  # Necessary to prevent encoding issues with XML::Parser 2.31+ and Perl 5.6
    }
    $_[0]->{'Text'} .= $_[1];
    return undef;
}



sub write_line {
    my ($filehandle, $line) = @_;
    print $filehandle join ("", @$line), "\n";
}

# Create the buildConfig.xml file for a specific collection
sub write_cfg_file {
    # this sub is called in make_auxiliary_files() in basebuilder.pm
    # the received args: $buildoutfile - destination file: buildConfig.xml
    #                    $buildcfg - all build options, 
    #                    $collectcfg - contents of collectionConfig.xml read in by read_cfg_file sub in buildConfigxml.pm.
    my ($buildoutfile, $buildcfg, $collectcfg) = @_;
    my $line = [];

    if (!open (COLCFG, ">$buildoutfile")) {
	print STDERR "buildConfigxml::write_cfg_file couldn't write the build config file $buildoutfile\n";
	die;
    }

    &write_line('COLCFG', ["<buildConfig xmlns:gsf=\"http://www.greenstone.org/greenstone3/schema/ConfigFormat\">"]);  

    # output building metadata to build config file 
    my $buildtype;
    if (defined $buildcfg->{"buildtype"}) {
	$buildtype = $buildcfg->{"buildtype"};
    } else {
	$buildtype = "mgpp";
    }
    my $numdocs;
    if (defined $buildcfg->{"numdocs"}) {
      $numdocs = $buildcfg->{"numdocs"};
    }
    &write_line('COLCFG', ["<metadataList>"]);
    &write_line('COLCFG', ["<metadata name=\"numDocs\">", $numdocs, "</metadata>"]);
    &write_line('COLCFG', ["<metadata name=\"buildType\">", $buildtype, "</metadata>"]);
    if (defined $buildcfg->{'indexstem'}) {
	&write_line('COLCFG', ["<metadata name=\"indexStem\">", $buildcfg->{"indexstem"}, "</metadata>"]);
    }
    if (defined $buildcfg->{'infodbtype'}) {
	&write_line('COLCFG', ["<metadata name=\"infodbType\">", $buildcfg->{"infodbtype"}, "</metadata>"]);
    }
    &write_line('COLCFG', ["</metadataList>"]);

    my $service_type = "MGPP";
    if ($buildtype eq "mg") {
	$service_type = "MG";
    } elsif ($buildtype eq "lucene") {
	$service_type = "Lucene";
    }

    # output serviceRackList
    &write_line('COLCFG', ["<serviceRackList>"]);

    # do the search service 
    &write_line('COLCFG', ["<serviceRack name=\"GS2", $service_type, "Search\">"]);
    if (defined $buildcfg->{'indexstem'}) {
      my $indexstem = $buildcfg->{'indexstem'};
      &write_line('COLCFG', ["<indexStem name=\"", $indexstem, "\" />"]);     
    }
    if (defined $buildcfg->{'infodbtype'}) {
        my $infodbtype = $buildcfg->{'infodbtype'};
        &write_line('COLCFG', ["<databaseType name=\"", $infodbtype, "\" />"]);     
    }

    #indexes
    # maps index name to shortname
    my $indexmap = {};
    # keeps the order for indexes
    my @indexlist = ();
    
    my $defaultindex = "";
    my $first = 1;
    my $maptype = "indexfieldmap";
    if ($buildtype eq "mg") {
	$maptype = "indexmap";
    }

    #map {print $_."\n"} keys %$buildcfg;

    if (defined $buildcfg->{$maptype}) {
	my $indexmap_t = $buildcfg->{$maptype};
       foreach my $i (@$indexmap_t) {
    my ($k, $v) = $i =~ /^(.*)\-\>(.*)$/;
	    $indexmap->{$k} = $v;
	    push @indexlist, $k;
	    if ($first) {
		$defaultindex = $v;
		$first = 0;
	    }	
	}
	# now if the user has assigned a default index, we use it 
	if (defined $collectcfg->{"defaultindex"}) {
	  $defaultindex = $indexmap->{$collectcfg->{"defaultindex"}};
	}
	
    } else {
	print STDERR "$maptype not defined";
    }  
    #for each index in indexList, write them out
    &write_line('COLCFG', ["<indexList>"]);
    foreach my $i (@indexlist) {
	my $index = $indexmap->{$i};
	&write_line('COLCFG', ["<index name=\"", $i, "\" ", "shortname=\"", $index, "\" />"]);
    }	
    &write_line('COLCFG', ["</indexList>"]);

    
    #$defaultindex = "ZZ" if (!$defaultindex); # index allfields by default
    if($defaultindex) {
	&write_line('COLCFG', ["<defaultIndex shortname=\"", $defaultindex, "\" />"]);
    }


    # do indexOptionList
    if ($buildtype eq "mg" || $buildtype eq "mgpp") {
        &write_line('COLCFG', ["<indexOptionList>"]);
	my $stemindexes = 3; # default is stem and casefold
	if (defined $buildcfg->{'stemindexes'} && $buildcfg->{'stemindexes'} =~ /^\d+$/ ) {
	    $stemindexes = $buildcfg->{'stemindexes'};
	}
	&write_line('COLCFG', ["<indexOption name=\"stemIndexes\" value=\"", $stemindexes, "\" />"]);
	
	my $maxnumeric = 4; # default
	if (defined $buildcfg->{'maxnumeric'} && $buildcfg->{'maxnumeric'} =~ /^\d+$/) {
	    $maxnumeric = $buildcfg->{'maxnumeric'};
	}
	&write_line('COLCFG', ["<indexOption name=\"maxnumeric\" value=\"", $maxnumeric, "\" />"]);
        &write_line('COLCFG', ["</indexOptionList>"]);
    }

    #  levelList
    my $levelmap = {};
    my @levellist = ();
    my $default_search_level = "Doc";
    my $default_retrieve_level = "Doc";
    my $default_db_level = "Doc";
    $first = 1;
    if ($buildtype eq "mgpp" || $buildtype eq "lucene") {
	if (defined $buildcfg->{'levelmap'}) {
	    my $levelmap_t = $buildcfg->{'levelmap'};
	    foreach my $l (@$levelmap_t) {
		my ($key, $val) = $l =~ /^(.*)\-\>(.*)$/;
		$levelmap->{$key} = $val;
		push @levellist, $key;
		if ($first) {
		    # let default search level follow the first level in the level list
		    $default_search_level = $val;
		    # retrieve/database levels may get modified later if text level is defined
		    $default_retrieve_level = $val;
		    $default_db_level = $val;
		    $first = 0;
		}
	    }
	}
	# the default level assigned by the user is no longer ignored [Shaoqun], but the retrievel level stays the same. 
       	#if (defined $collectcfg->{"defaultlevel"}) {
	$default_search_level = $levelmap->{$collectcfg->{"defaultlevel"}};
        #  $default_retrieve_level = $default_search_level;
	#}
	
	if (defined $buildcfg->{'textlevel'}) {
	   # let the retrieve/database levels always follow the textlevel
           $default_retrieve_level = $buildcfg->{'textlevel'};
	   $default_db_level = $buildcfg->{'textlevel'};
		 
	}
    }
    #for each level in levelList, write them out
    if ($buildtype ne "mg") {
    &write_line('COLCFG', ["<levelList>"]);
    foreach my $lv (@levellist) {
	my $level = $levelmap->{$lv};
        &write_line('COLCFG', ["<level name=\"", $lv, "\" shortname=\"", $level, "\" />"]);
    }	
    &write_line('COLCFG', ["</levelList>"]);
    }
    # add in defaultLevel as the same level as indexLevelList, making the reading job easier
    if ($buildtype eq "lucene" || $buildtype eq "mgpp") {
	&write_line('COLCFG', ["<defaultLevel shortname=\"", $default_search_level, "\" />"]);
    }
    if ($buildtype eq "lucene" || $buildtype eq "mgpp") {
        &write_line('COLCFG', ["<defaultDBLevel shortname=\"", $default_db_level, "\" />"]);
    }
    # do searchTypeList
    if ($buildtype eq "mgpp" || $buildtype eq "lucene") {
	  &write_line('COLCFG', ["<searchTypeList>"]);
      
      if (defined $buildcfg->{"searchtype"}) {
	  my $searchtype_t = $buildcfg->{"searchtype"};
	  foreach my $s (@$searchtype_t) {
	  &write_line('COLCFG', ["<searchType name=\"", $s, "\" />"]);
	}
      } else {
	  &write_line('COLCFG', ["<searchType name=\"plain\" />"]);
	  &write_line('COLCFG', ["<searchType name=\"form\" />"]);
      }
	  &write_line('COLCFG', ["</searchTypeList>"]);
    }

    # do indexLanguageList [in collect.cfg: languages; in build.cfg: languagemap]
    $first = 1;
    my $default_lang = "";
    my $default_lang_short = "";
    if (defined $buildcfg->{"languagemap"}) {
      &write_line('COLCFG', ["<indexLanguageList>"]);

      my $langmap_t = $buildcfg->{"languagemap"};
      foreach my $l (@$langmap_t) {
	my ($k, $v) = $l =~ /^(.*)\-\>(.*)$/; 

	&write_line('COLCFG', ["<indexLanguage name=\"", $k, "\" shortname=\"", $v, "\" />"]);
	if ($first) {
	  $default_lang = $k; #name
	  $default_lang_short = $v; #shortname
	  $first = 0;
	}
      }

      &write_line('COLCFG', ["</indexLanguageList>"]);
      # now if the user has assigned a default language (as "en", "ru" etc.)
      if (defined $collectcfg->{"defaultlanguage"}) {
	$default_lang = $collectcfg->{"defaultlanguage"};
      }
      &write_line('COLCFG', ["<defaultIndexLanguage name=\"", $default_lang, "\" shortname=\"", $default_lang_short, "\" />"]);
    }


    # do indexSubcollectionList
    my $default_subcol = "";# make it in sub scope to be used in the concatenation
    if (defined $buildcfg->{'subcollectionmap'}) {
      &write_line('COLCFG', ["<indexSubcollectionList>"]);
      my $subcolmap = {};
      my @subcollist = ();
      $first = 1;
      my $subcolmap_t = $buildcfg->{'subcollectionmap'};
      foreach my $l (@$subcolmap_t) {
	my ($k, $v) = $l =~ /^(.*)\-\>(.*)$/;
	$subcolmap->{$k} = $v;
	push @subcollist, $k;
	if ($first) {
	  $default_subcol = $v;
	  $first = 0;
	}
      }
      foreach my $sl (@subcollist) {
	my $subcol = $subcolmap->{$sl};
	&write_line('COLCFG', ["<indexSubcollection name=\"", $sl, "\" shortname=\"", $subcol, "\" />"]);
      }	

      &write_line('COLCFG', ["</indexSubcollectionList>"]);
      &write_line('COLCFG', ["<defaultIndexSubcollection shortname=\"", $default_subcol, "\" />"]);
    }
      
    # close off search service 
    &write_line('COLCFG', ["</serviceRack>"]);

    # do the retrieve service
    &write_line('COLCFG', ["<serviceRack name=\"GS2", $service_type, "Retrieve\">"]);

    # do default index 
    if (defined $buildcfg->{"languagemap"}) {
	&write_line('COLCFG', ["<defaultIndexLanguage shortname=\"", $default_lang, "\" />"]);
    }
    if (defined $buildcfg->{'subcollectionmap'}) {
	&write_line('COLCFG', ["<defaultIndexSubcollection shortname=\"", $default_subcol, "\" />"]);
    }
    if ($buildtype eq "mg") {
      &write_line('COLCFG', ["<defaultIndex shortname=\"", $defaultindex, "\" />"]);
    }

    if (defined $buildcfg->{'indexstem'}) {
      my $indexstem = $buildcfg->{'indexstem'};
      &write_line('COLCFG', ["<indexStem name=\"", $indexstem, "\" />"]);     
    }
    if ($buildtype eq "mgpp" || $buildtype eq "lucene") {
      &write_line('COLCFG', ["<defaultLevel shortname=\"", $default_retrieve_level, "\" />"]);
    }
    if (defined $buildcfg->{'infodbtype'}) {
        my $infodbtype = $buildcfg->{'infodbtype'};
        &write_line('COLCFG', ["<databaseType name=\"", $infodbtype, "\" />"]);     
    }

    &write_line('COLCFG', ["</serviceRack>"]);

    # do the browse service
    my $count = 1;
    my $phind = 0;
    my $started_classifiers = 0;

    my $classifiers = $collectcfg->{"classify"};
    foreach my $cl (@$classifiers) {
      my $name = "CL$count";
      $count++;
      my ($classname) = @$cl[0];
      if ($classname =~ /^phind$/i) {
	$phind=1;
	#should add it into coll config classifiers
	next;
      }
      
      if (not $started_classifiers) {
	&write_line('COLCFG', ["<serviceRack name=\"GS2Browse\">"]);
	if (defined $buildcfg->{'indexstem'}) {
	  my $indexstem = $buildcfg->{'indexstem'};
	  &write_line('COLCFG', ["<indexStem name=\"", $indexstem, "\" />"]);     
	}
	if (defined $buildcfg->{'infodbtype'}) {
	    my $infodbtype = $buildcfg->{'infodbtype'};
	    &write_line('COLCFG', ["<databaseType name=\"", $infodbtype, "\" />"]);     
	}
	&write_line('COLCFG', ["<classifierList>"]);		
	$started_classifiers = 1;
      }
      my $content = ''; #use buttonname first, then metadata
      if ($classname eq "DateList") {
	$content = "Date";
      } else {
	for (my $j=0; $j<scalar(@$cl); $j++) {
	  my $arg = @$cl[$j];
	  if ($arg eq "-buttonname"){
	    $content = @$cl[$j+1];
	    last;
	  } elsif ($arg eq "-metadata") {
	    $content = @$cl[$j+1];
	  }
	  
	}
      }
      &write_line('COLCFG', ["<classifier name=\"", $name, "\" content=\"", $content, "\" />"]);
    }     
    if ($started_classifiers) {
      # end the classifiers
      &write_line('COLCFG', ["</classifierList>"]);
      # close off the Browse service
      &write_line('COLCFG', ["</serviceRack>"]);
    }
    
    # the phind classifier is a separate service
    if ($phind) {
	# if phind classifier
	&write_line('COLCFG', ["<serviceRack name=\"PhindPhraseBrowse\" />"]);
    }

    
    &write_line('COLCFG', ["</serviceRackList>"]);
    &write_line('COLCFG', ["</buildConfig>"]);

    close (COLCFG);
  }


#########################################################

1;