1. Read in all rows from existing file
2. Update the rows
3. Write the updated rows to new file

use strict;
use warnings;
use Spreadsheet::ParseXLSX;
use Excel::Writer::XLSX;

my $in_file = "SRC185.xlsx";
my $out_file = "Output2022.xlsx";

# Read in all rows from existing file
my $rows = read_excel($in_file);

my $headers = [
    "source_id",
    "first_name",
    "middle",
    "last_name",
    "address1",
    "city",
    "state",
    "postal_code",
    "phone_number",
    "address3",
    "province",
    "email",
];
my $CA_zip = 90005;

# Update the rows
for my $row (@$rows) {
    if ($row->[6] eq 'CA' && ! $row->[7]) {
        $row->[7] = $CA_zip;
    }
}

# add headers as first row
unshift(@$rows, $headers);

# Write the updated rows to new file
my $col_num = scalar @$headers - 1;
write_excel($out_file, $rows, $col_num);


sub read_excel {
    my ( $file, $sheet ) = @_;
    $sheet ||= 0;
    
    my $parser = Spreadsheet::ParseXLSX->new();
    my $workbook = $parser->parse($file);
    if ( not defined $workbook ) {
        die $parser->error;
    }
 
    my $worksheet = $workbook->worksheet($sheet);
 
    my ( $row_min, $row_max ) = $worksheet->row_range();
    my ( $col_min, $col_max ) = $worksheet->col_range();
 
    my @rows;
    for my $row ( $row_min .. $row_max ) {
        my @cells;
        for my $col ( $col_min .. $col_max ) {
            my $cell = $worksheet->get_cell( $row, $col );
            if (not $cell) {
                push(@cells,'');
                next;
            }
            my $value = $cell->value();
            push(@cells,$value);
        }
        push(@rows,\@cells);
    }
    return \@rows;
}

sub write_excel {
    my ( $file, $rows, $col_max ) = @_;
    
    my $workbook = Excel::Writer::XLSX->new( $file );
    if ( not defined $workbook ) {
        die "Could not open file: $!";
    }

    my $worksheet = $workbook->add_worksheet();
    my $row_num = 0;

    for my $row ( @$rows ) {
        for my $col (0 .. $col_max) {
            $worksheet->write( $row_num, $col, $row->[$col] );
        }
        $row_num++;
    }
    $workbook->close();
    return;
}
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