#!/usr/bin/perl -w

use strict;
use File::Basename;
use Term::ReadLine;

my (%new, %old, %oldtypes, %newtypes);

die "Usage: prcs-ttyask-move <oldlist> <newlist>" unless $#ARGV == 1;
open OLD, "<" . $ARGV[0] or die "open: $!";
open NEW, ">" . $ARGV[1] or die "open: $!";

# index by basename
for (<OLD>) {
  chomp;
  my @line = split (/\t/, $_);
  if ($line[0] eq 'ADDED') {
    $new{basename ($line[1])} = [] unless defined $new{basename ($line[1])};
    push @{$new{basename ($line[1])}}, $line[1];
    $newtypes{$line[1]} = $line[2];
  } elsif ($line[1] eq 'DELETED') {
    $old{basename ($line[0])} = [] unless defined $old{basename ($line[0])};
    push @{$old{basename ($line[0])}}, $line[0];
    $oldtypes{$line[0]} = $line[2];
  }
}
close OLD;

my $term = new Term::ReadLine 'Simple Perl calc';
my $OUT = $term->OUT;

# try to match by filename
foreach my $name (keys %old) {
  if (defined $new{$name}) {
    foreach my $oldname (@{$old{$name}}) {
      print "\n File: $oldname\n";
      print "0: DELETED\n";

      # filter by type
      my @newnames;
      foreach my $newname (@{$new{$name}}) {
	push @newnames, $newname if $newtypes{$newname} eq $oldtypes{$oldname};
      }

      # display choices
      my $i = 1;
      foreach my $newname (@newnames) {
	print "$i: $newname\n";
	$i ++;
      }
      my $prompt = " your choice -> ";
      my $res;
      do {
	$_ = $term->readline($prompt);
      } until m/^[0-9]+$/ and ($_ >= 0) and ($_ < $i);
      my $choice = $_;

      if ($choice == 0) {
	print NEW "$oldname\tDELETED\t", $oldtypes{$oldname}, "\n";
      } else {
	print NEW "$oldname\t", $newnames[$choice - 1], "\t",
	  $oldtypes{$oldname}, "\n";
	# remove the selected ADDED element
	for (my $i = 0; $i <= $#{$new{$name}}; $i++) {
	  if ($new{$name}->[$i] eq $newnames[$choice - 1]) {
	    splice (@{$new{$name}}, $i, 1);
	    last;
	  }
	}
      }
    }
  } else {
    # Found no candidate: keep DELETED line
    print NEW "$name\tDELETED\t", $oldtypes{$name}, "\n";
  }
}

# Output ADDED files not selected as renamed
foreach my $name (keys %new) {
  foreach my $newname (@{$new{$name}}) {
    print NEW "ADDED\t$newname\t", $newtypes{$newname}, "\n";
  }
}