#!/usr/bin/perl -w

use strict;

# this tool manipulates fixed length cch tax files by comparing the
# update files in the $update_dir to the initial install files 
# in the $init_dir
#
# it produces .DOIT files in $update_dir which are suitable for
# syncing a database initialzed with the files in $init_dir to
# the state represented by the files in $update_dir
#
# how one acquires update files from cch that overlap with initial
# full install remains a mystery

my $init_dir = "cchinit/";
my $update_dir = "cchupdate/";

foreach my $file (qw (CODE DETAIL PLUS4 GEOCODE TXMATRIX ZIP)) {
   my $tfile = $update_dir. $file. "T";
   $tfile = $update_dir. "TXMATRIT" if $tfile =~ /TXMATRIXT$/;
   open FILE, "$tfile.TXT" or die "Can't open $tfile.TXT\n";
   open INSERT, ">$tfile.INS" or die "Can't open $tfile.INS\n";
   open DELETE, ">$tfile.DEL" or die "Can't open $tfile.DEL\n";
   while(<FILE>){
     chomp;
     print INSERT "$_\n" if s/I$//;
     print DELETE "$_\n" if s/D$//;
   }
   close FILE;
   close INSERT;
   close DELETE;
   system "sort $tfile.INS > $tfile.INSSORT";
   system "sort $tfile.DEL > $tfile.DELSORT";
   system "sort $init_dir$file.txt > $tfile.ORGINSSORT";
   system "comm -12 $tfile.INSSORT $tfile.ORGINSSORT > $tfile.PREINS";
   system "comm -23 $tfile.INSSORT $tfile.ORGINSSORT > $tfile.2BEINS";
   system "comm -23 $tfile.DELSORT $tfile.ORGINSSORT > $tfile.PREDEL";
   system "comm -12 $tfile.DELSORT $tfile.ORGINSSORT > $tfile.2BEDEL";
}

foreach my $file (qw (CODET DETAILT PLUS4T GEOCODET TXMATRIT ZIPT)) {
   my $tfile = $update_dir. $file;
   $tfile = "TXMATRIT" if $tfile eq "TXMATRIXT";
   open INSERT, "$tfile.2BEINS" or die "Can't open $tfile.2BEINS\n";
   open DELETE, "$tfile.2BEDEL" or die "Can't open $tfile.2BEDEL\n";
   open FILE, ">$tfile.DOIT" or die "Can't open $tfile.DOIT\n";
   while(<INSERT>){
     chomp;
     print FILE $_, "I\n";
   }
   while(<DELETE>){
     chomp;
     print FILE $_, "D\n";
   }
   close FILE;
   close INSERT;
   close DELETE;
}