#!/usr/bin/env perl

use strict;
use warnings;

use Excel::Writer::XLSX;
use Getopt::Long;
use Spreadsheet::ParseXLSX;

my @desired = ( qw/ qux foobar fubar /, );
my $infile  = undef;
my $outfile = undef;

{
    my @temp_desired = ();
    GetOptions(
        q{keep:s}   => \@temp_desired,
        q{input:s}  => \$infile,
        q{output:s} => \$outfile,
        q{help}     => sub { &help; },
    );
    if ( scalar @temp_desired ) {
        @desired = ( @temp_desired, );
    }
    &help
      unless ( ( defined $infile and -e $infile )
        and ( defined $outfile ) );
}

my $parser_i   = Spreadsheet::ParseXLSX->new();
my $workbook_i = $parser_i->parse($infile)
  or die qq{$infile}, q{: }, $parser_i->error(), qq{.\n};

my $workbook_o = Excel::Writer::XLSX->new($outfile)
  or die qq{$outfile}, q{: },
  qq{Problem creating new Excel file: }, $!, qq{\n};

foreach my $worksheet_i ( $workbook_i->worksheets() ) {
    my $worksheet_o = $workbook_o->add_worksheet(
        $worksheet_i->get_name() );
    my %ignore    = ();
    my @row_range = $worksheet_i->row_range();
    foreach my $i ( $row_range[0] .. $row_range[1] ) {
        if ( not $i ) {
            my @col_range = $worksheet_i->col_range();
            foreach my $j ( $col_range[0] .. $col_range[1] )
            {
                my $cell = $worksheet_i->get_cell( $i, $j );
                if ( defined $cell ) {
                    if (
                        not scalar
                        grep { $_ eq $cell->unformatted() }
                        @desired )
                    {
                        $ignore{$j}++;
                        next;
                    }
                    $worksheet_o->write( $i, $j,
                        $cell->unformatted(), );
                }
            }
        }
        else {
            my @col_range = $worksheet_i->col_range();
            foreach my $j ( $col_range[0] .. $col_range[1] )
            {
                next if ( defined $ignore{$j} );

                my $cell = $worksheet_i->get_cell( $i, $j );
                next unless ( defined $cell );
                $worksheet_o->write( $i, $j,
                    $cell->unformatted(), );
            }
        }
    }
}

$workbook_o->close();

sub help {
    die
qq{$0 --input file --output file [--keep s1] [--keep s2] ...\n};
}