###############################################################################
#
# dbutil::stdoutxml -- A dbutil implementation that, hopefully unsurprisingly,
# writes infodb stuff as XML to STDOUT. This will be used as part of the Hadoop
# process - where this output will be passed through to the reduce phase to be
# merged with other documents.
#
# A component of the Greenstone digital library software from the New Zealand
# Digital Library Project at the University of Waikato, New Zealand.
#
# Copyright (C) 2009
#
# 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.
#
###############################################################################

package dbutil::stdoutxml;

# Pragma
use strict;

# Perl built-in modules
use Time::HiRes qw( gettimeofday );

# Greenstone modules
use FileUtils;

# -----------------------------------------------------------------------------
#   STDOUT XML IMPLEMENTATION
# -----------------------------------------------------------------------------
my $debug = 0;
my $type = 'doc';

## @function open_infodb_write_handle()
#
# Since we are writing to STDOUT we don't have to open a handle
#
sub open_infodb_write_handle
{
  my $infodb_file_path = shift(@_);
  my $opt_append = shift(@_);
  if ($debug)
  {
    print STDERR "stdoutxml::open_infodb_write_handle(\"$infodb_file_path\", \"$opt_append\")\n";
  }
  # Store this for later
  $type = $infodb_file_path;
  return 1;
}
## open_infodb_write_handle() ##

## @function
#
# In this function we not close the handle we didn't open :P
#
sub close_infodb_write_handle
{
  my $infodb_handle = shift(@_);
  if ($debug)
  {
    print STDERR "stdoutxml::close_infodb_write_handle()\n";
  }
}
## close_infodb_write_handle() ##


## @function delete_infodb_entry()
#
sub delete_infodb_entry
{
  my $infodb_handle = shift(@_);
  my $infodb_key = shift(@_);
  print "!implement delete_infodb_entry()\n";
}
## delete_infodb_entry() ##


## @function get_infodb_file_path()
#
sub get_infodb_file_path
{
  my $collection_name = shift(@_);
  my $infodb_directory_path = shift(@_);
  my $infodb_type = 'error';
  if ($debug)
  {
    print STDERR "stdoutxml::get_infodb_file_path(\"$collection_name\", \"$infodb_directory_path\")\n";
  }
  if ($collection_name =~ /(datestamp|doc|src|rss)/)
  {
    $infodb_type = $1;
  }
  return $infodb_type;
}
## get_infodb_file_path() ##


## @function read_infodb_file()
#
sub read_infodb_file
{
  my $infodb_file_path = shift(@_);
  my $infodb_map = shift(@_);
  print "!implement read_infodb_file()\n";
}
## read_infodb_file() ##


## @function read_infodb_keys()
#
sub read_infodb_keys
{
  my $infodb_file_path = shift(@_);
  my $infodb_map = shift(@_);
  print "!implement read_infodb_keys()\n";
}
## read_infodb_keys() ##


sub set_infodb_entry
{
    my $infodb_file_path = shift(@_);
    my $infodb_key = shift(@_);
    my $infodb_map = shift(@_);
    my $status = undef;
    print "!implement set_infodb_entry()\n";
    return $status;
}
## set_infodb_entry() ##


## @function supportsDatestamp
#
# Why, yes, yes it does!
#
sub supportsDatestamp
{
  return 1;
}
## supportsDatestamp() ##

## @function supportsRSS
#
# Why, yes, yes it does!
#
sub supportsRSS
{
  return 1;
}
## supportsRSS() ##

## @function write_infodb_entry()
#
sub write_infodb_entry
{
  my $infodb_handle = shift(@_);
  my $infodb_key = shift(@_);
  my $infodb_map = shift(@_);
  if ($debug)
  {
    print STDERR "stdoutxml::write_infodb_enty(<infodb_handle>, \"$infodb_key\", <infodb_map>)\n";
  }
  my @values;
  foreach my $infodb_value_key (sort keys(%$infodb_map))
  {
    foreach my $infodb_value (@{$infodb_map->{$infodb_value_key}})
    {
      if ($infodb_value =~ /-{70,}/)
      {
        # if value contains 70 or more hyphens in a row we need to escape them
        # to prevent txt2db from treating them as a separator
        $infodb_value =~ s/-/&\#045;/gi;
      }
      push(@values, '<' . $infodb_value_key . '>' . $infodb_value);
    }
  }
  my $values_str = join("\n", @values);
  $values_str =~ s/&/&amp;/g;
  $values_str =~ s/</&lt;/g;
  $values_str =~ s/>/&gt;/g;
  $values_str =~ s/"/&quot;/g;
  $values_str =~ s/'/&apos;/g;
  my ($seconds, $microseconds) = gettimeofday();
  print '<InfoDBEntry type="' . $type . '" key="' . $infodb_key . '" mode="set" timestamp="' . $seconds . '.' . $microseconds . '">' . $values_str . '</InfoDBEntry>' . "\n";
}
## write_infodb_entry() ##

## @function write_infodb_rawentry()
#
sub write_infodb_rawentry
{
  my $infodb_handle = shift(@_);
  my $infodb_key = shift(@_);
  my $infodb_val = shift(@_);
  $infodb_val =~ s/&/&amp;/g;
  $infodb_val =~ s/</&lt;/g;
  $infodb_val =~ s/>/&gt;/g;
  $infodb_val =~ s/"/&quot;/g;
  $infodb_val =~ s/'/&apos;/g;
  my ($seconds, $microseconds) = gettimeofday();
  print '<InfoDBEntry type="' . $type . '" key="' . $infodb_key . '" mode="set" timestamp="' . $seconds . '.' . $microseconds . '">' . $infodb_val . '</InfoDBEntry>' . "\n";
}

1;