#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper; $Data::Dumper::Useqq = 1;
use File::Find;

find(\&wanted,'D:\coding\patientperclinic-withouthistory');

sub wanted
{
my $icd_path = 'D:\coding\icd-10-codes.txt';
my $in_path =  <*>;
my $out_path = 'D:\coding\female1_corrected.txt';


open my $icd_fh, '<', $icd_path
    or die "Cannot open '$icd_path': $!";

#print "Reading '$icd_path'\n";
my %lookup_icd;
while ( my $line = <$icd_fh> ) {
    chomp $line;
    my ( $lookup_code, $icd_code_and_text ) = split /\t/, $line;

#    print Dumper $lookup_code, $icd_code_and_text;

    if ( exists $lookup_icd{$lookup_code} ) {
        warn "Replacing $lookup_code;"
           . " was '$lookup_icd{$lookup_code}',"
           . " now '$icd_code_and_text'\n";
    }
    $lookup_icd{$lookup_code} = $icd_code_and_text;
}
close $icd_fh;


#print Dumper \%lookup_icd;


#print "Reading '$in_path'\n";
#print "Writing '$out_path'\n";
open my $in_fh, '<', $in_path
    or die "Cannot open '$in_path': $!";
open my $out_fh, '>', $out_path
    or die "Cannot open '$out_path': $!";

while ( my $line = <$in_fh> ) {
    chomp $line;

    my @cols = split / /, $line;

    for my $possible_icd (@cols) {
        my $replacement_icd = $lookup_icd{$possible_icd};
        if ($replacement_icd) {
            $possible_icd = $replacement_icd;
        }
    }

    print {$out_fh} join( ' ', @cols ), "\n";

}
close $in_fh;
close $out_fh
    or warn "Cannot close 'out_path': $!\nSome data may not have been written.";
unlink $in_path
    or die "Could not delete '$in_path': $!";

use File::Copy;
move( $out_path, $in_path )
    or die "Could not move file '$out_path' to '$in_path': $!";
}