package LIMS::Local::QueryLibrary;

use strict;
use warnings;

use Data::Dumper;

our $VERSION = 0.0.3; # CPAN version has not been updated since 2004

=head1 NAME

SQL::Library - A module for managing simple SQL libraries
stored in INI-like files.

=head1 VERSION

This document refers to version 0.0.3 of SQL::Library.

=head1 SYNOPSIS

Modification of CPAN SQL::Library - uses its new() and retr() methods and adds
a new function in new() to ensure unique entity_name entries. Original
SQL::Library silently ignored duplicate entries eg [find_stuff] .... [find_stuff]
and appended content of duplicate entry to content of initial entry:
$self->{'contents'}->{$curr_name} .= $_; # $curr_name = entity_name of SQL query

only includes retr() & elements(), not other methods such as set(), drop(), etc
=cut

sub new
{
    my $proto = shift; 
    my $options = shift;
    my $self = {
                 'options'  => $options,
                 'contents' => undef
               };

    my $curr_name = '';

    my @lib_arr = ();
    if ( ref $self->{'options'}->{'lib'} eq 'ARRAY' )
    {
        # Could be a filehandle or a string.
        if ( @{ $self->{'options'}->{'lib'} } == 1 )
        {
            @lib_arr = split /(?<=\n)/, $self->{'options'}->{'lib'}->[0];
        }
        else
        {
            @lib_arr = @{ $self->{'options'}->{'lib'} };
        }
    }
    else
    {
        open LIB, $self->{'options'}->{'lib'}
          or die "Cannot open $self->{'options'}->{'lib'}: $!";
        @lib_arr = <LIB>;
        close LIB;
    }
#-------------------------------------------------------------------------------            
	my %seen = (); # new code to check for duplicate entries - see below
#-------------------------------------------------------------------------------            
    foreach ( @lib_arr ) # each line of library(s) content
    {
        next if m{^\s*$};
        next if m{^\s*#};
        next if m{^\s*//};
        if ( m{^\[([^\]]+)\]} ) # gets entity_name of entry eg [find_stuff]
        {
            $curr_name = $1; # warn Dumper $curr_name;
#-------------------------------------------------------------------------------            
			die 'already have entry for ' . $curr_name if $seen{$curr_name}++;
#-------------------------------------------------------------------------------            
            next;
        }
        if ( $curr_name )
        { 
            $self->{'contents'}->{$curr_name} .= $_;
        }
    }

    bless $self, $proto;
    return $self;
}

=item $OBJ-E<gt>retr( NAME )

Returns the library entry referenced by NAME.

=cut 

sub retr
{
    my ( $self, $entity_name ) = @_;
    return $self->{'contents'}->{$entity_name};
}

sub elements
{
    my $self = shift;
    return sort keys %{$self->{'contents'}};
}

1;