#!/usr/bin/perl

use strict;
use warnings;

use Math::BigFloat;
use Date::Manip;

Math::BigFloat->precision(-2);
my $ZERO =  Math::BigFloat->new("0.00");

my $VERBOSE = 0;
my $DEBUG = 0;

my $LEDGER_BIN = "/usr/local/bin/ledger";

######################################################################
sub SubSetSumSolver ($$$) {
  my($numberList, $totalSought, $extractNumber) = @_;

  my($P, $N) = (0, 0);
  foreach my $ii (@{$numberList}) {
    if ($ii < $ZERO) {
      $N += $ii;
    } else {
      $P += $ii;
    }
  }
  my $size = scalar(@{$numberList});
  my %Q;
  my(@L) =
     map { { val => &$extractNumber($_), obj => $_ } } @{$numberList};

  for (my $ii = 0 ; $ii <= $size ; $ii++ ) {
    $Q{$ii}{0}{value} = 1;
    $Q{$ii}{0}{list} = [];
  }
  for (my $jj = $N; $jj <= $P ; $jj++) {
    $Q{0}{$jj}{value} = ($L[0]{val} == $jj);
    $Q{0}{$jj}{list} = $Q{0}{$jj}{value} ? [ $L[0]{obj} ] : [];
  }
  for (my $ii = 1; $ii <= $size ; $ii++ ) {
    for (my $jj = $N; $jj <= $P ; $jj++) {
      if ($Q{$ii-1}{$jj}{value}) {
        $Q{$ii}{$jj}{value} = 1;

        $Q{$ii}{$jj}{list} = [] unless defined $Q{$ii}{$jj}{list};
        push(@{$Q{$ii}{$jj}{list}}, @{$Q{$ii-1}{$jj}{list}});

      } elsif ($L[$ii]{val} == $jj) {
        $Q{$ii}{$jj}{value} = 1;

        $Q{$ii}{$jj}{list} = [] unless defined $Q{$ii}{$jj}{list};
        push(@{$Q{$ii}{$jj}{list}}, $jj);
      } elsif ($Q{$ii-1}{$jj - $L[$ii]{val}}{value}) {
        $Q{$ii}{$jj}{value} = 1;
        $Q{$ii}{$jj}{list} = [] unless defined $Q{$ii}{$jj}{list};
        push(@{$Q{$ii}{$jj}{list}}, $L[$ii]{obj}, @{$Q{$ii-1}{$jj - $L[$ii]{val}}{list}});
      } else {
        $Q{$ii}{$jj}{value} = 0;
        $Q{$ii}{$jj}{list} = [];
      }
    }
  }
  foreach (my $ii = 0; $ii <= $size; $ii++) {
    foreach (my $jj = $N; $jj <= $P; $jj++) {
      print "Q($ii, $jj) == $Q{$ii}{$jj}{value} with List of ", join(", ", @{$Q{$ii}{$jj}{list}}), "\n";
    }
  }
  return [ $Q{$size}{$totalSought}{value}, \@{$Q{$size}{$totalSought}{list}}];
}
######################################################################
sub Commify ($) {
    my $text = reverse $_[0];
    $text =~ s/(\d\d\d)(?=\d)(?!\d*\.)/$1,/g;
    return scalar reverse $text;
}
######################################################################
sub ParseNumber($) {
  $_[0] =~ s/,//g;
  return Math::BigFloat->new($_[0]);
}
if (@ARGV < 4) {
  print STDERR "usage: $0 <ACCOUNT_REGEX> <END_DATE> <BANK_STATEMENT_BALANCE> <LEDGER_OPTIONS>\n";
  exit 1;
}
######################################################################
my($account, $endDate, $balanceSought, @mainLedgerOptions) = @ARGV;

$balanceSought = ParseNumber($balanceSought);

my $err;
my $startDate = UnixDate(DateCalc(ParseDate($endDate), ParseDateDelta("- 1 month"), \$err), "%Y/%m/%d");
die "Date calculation error on $endDate" if ($err);

my(@fullCommand) = ($LEDGER_BIN, @mainLedgerOptions, '-V', '-X', '$',
                    '-b', $startDate, '-e', $endDate,
                    '-F', '"%(date)","%C","%P","%t"\n',
                    'reg', "/$account/");

  open(FILE, "-|", @fullCommand)
    or die "unable to run command ledger command: @fullCommand: $!";

my @entries;

foreach my $line (<FILE>) {
  die "Unable to parse output line from: $line"
    unless $line =~ /^\s*"([^"]*)","([^"]*)","([^"]*)","([^"]*)"\s*$/;
  my($date, $checkNum, $payee, $amount) = ($1, $2, $3, $4);
  die "$amount is not a valid amount"
    unless $amount =~ s/\s*\$\s*([\-\d\.\,]+)\s*$/$1/;
  $amount = ParseNumber($amount);

  print "$date, $checkNum, $payee, $amount\n";
  push(@entries, { date => $date, checkNum => $checkNum, amount => $amount });
}

###############################################################################
#
# Local variables:
# compile-command: "perl -c bank-reconcilation.plx"
# End: