#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
use Spreadsheet::ParseExcel;
use Spreadsheet::ParseExcel::SaveParser;

use constant ARGUMENTS => scalar 2;

sub input_test {

    if (@_ > ARGUMENTS) {
	print "\nPlease no more than ".ARGUMENTS." arguments (ARGV[])!\n";
	print "\nCorrect Syntax: perl $0 'in.xls' 'out.xls'\n\n";
	exit();
    }
    elsif (@_ < ARGUMENTS) {
	print "\nPlease no less than ".ARGUMENTS." arguments (ARGV[])\n";
	print "\nCorrect Syntax: perl $0 'in.xls' 'out.xls'\n\n";
	exit();
    }
    return(@_);
}

my @input = input_test(@ARGV);

sub excel {

    # You do need to define the @_, it would work with $(string) = shift;
    my $in   = shift(@_);
    my $out  = shift(@_);

    # Open an existing file with SaveParser
    my $parser   = Spreadsheet::ParseExcel::SaveParser->new();

    my $template = $parser->Parse($in);

    my $worksheet_count = $template->worksheet_count();

    print $worksheet_count . "\n";

    my $filename = $template->get_filename();

    my ($print_areas,$print_titles);

    print $filename . "\n";

    $template->SaveAs($out);

=overwriting process
    foreach my $worksheet ( $workbook->worksheets() ) {
    	my $row  = 0;
	my $col  = 0;

	# Overwrite the string in cell A1
	$worksheet->AddCell( $row, $col, 'String in Cell A1' );

	# Add a new string in cell B1
	$worksheet->AddCell( $row, $col + 1, 'String in Cell A2' );

	# Add a new string in cell C1 with the format from cell A3.
	my $cell = $worksheet->get_cell( $row + 2, $col );
	my $format_number = $cell->{FormatNo};

	$worksheet->AddCell( $row, $col + 2, 'String in Cell A3', $format_number );

	# Write over the existing file or write a new file.
	$workbook->SaveAs($out);
    }
=cut
}

excel(@ARGV);

sub extra {

    my $in   = shift(@_);
    my $out  = shift(@_);

    my $parser   = Spreadsheet::ParseExcel->new();
    my $workbook = $parser->parse($in);

    if ( !defined $workbook ) {
        die $parser->error(), ".\n";
    }

    foreach my $worksheet ( $workbook->worksheets() ) {

        my ( $row_min, $row_max ) = $worksheet->row_range();
        my ( $col_min, $col_max ) = $worksheet->col_range();

        foreach my $row ( $row_min .. $row_max ) {
            foreach my $col ( $col_min .. $col_max ) {

                my $cell = $worksheet->get_cell( $row, $col );
                next unless $cell;

                print "Row, Col    = ($row, $col)\n";
                print "Value       = ", $cell->value(),       "\n";
                print "Unformatted = ", $cell->unformatted(), "\n";
                print "\n";
            }
        }
    }
}

extra(@ARGV)