#!/usr/bin/perl
# Copyright © 2018, Bradley M. Kuhn
#   License: AGPL-3.0-or-later

use strict;
use warnings;

use autodie qw(open close opendir);

use Getopt::Long;
use File::Spec;
use Date::Manip qw(ParseDate UnixDate);

my($PAYMENT_DIR, $VERBOSE, $INTERACTIVE, $PAYMENT_NUMBER, $RT_CMD);

sub FindUniqueTicket(@) {
  my @searchTerms = @_;
  open(my $rtLsFH, "-|", "$RT_CMD", "ls", "-i", 'Queue = outreachy-interns AND ' .
       join(" AND ", @searchTerms));
  my $ticketSpec;
  while (my $lsLine = <$rtLsFH>) {
    chomp $lsLine;
    if ($lsLine =~ /ticket/) {
      if (defined $ticketSpec) {
        $ticketSpec = undef;
        last;
      }
      $ticketSpec = $lsLine;
    }
  }
  close $rtLsFH;
  return $ticketSpec;
}
sub PaymentDateByTicket($$) {
  my($ticketSpec, $paymentNumber) = @_;
  open(my $rtPayFH, "-|", "$RT_CMD", "show", "-f", 'CF.{payment-' . $paymentNumber . '-sent}', $ticketSpec);
  my $date;
  while (my $payLine = <$rtPayFH>) {
    chomp $payLine;
    if ($payLine =~ /[\d\-]+/) {
      $date = $payLine;
      last;
    }
  }
  close $rtPayFH;
  return $date;
}
sub LedgerTagFromTicket($$) {
  my($ticketSpec, $tag) = @_;
  open(my $rtPayFH, "-|", "$RT_CMD", "show", "-f", 'CF.{ledger-tags}', $ticketSpec);
  my $tagValue;
  while (my $tagsLine = <$rtPayFH>) {
    chomp $tagsLine;
    if ($tagsLine =~ /^\s*;?$tag\s*:\s*(.+)\s*$/i) {
      $tagValue = $1;
      last;
    }
  }
  close $rtPayFH;
  return $tagValue;
}

GetOptions("paymentDir=s" => \$PAYMENT_DIR, "verbose=i" => \$VERBOSE, "interactive" => \$INTERACTIVE,
           "paymentNumber=i" => \$PAYMENT_NUMBER, "rtCommand=s" => $RT_CMD);

$RT_CMD = '/usr/bin/rt' unless defined $RT_CMD;

$INTERACTIVE = 0 if not defined $INTERACTIVE;

unless (defined $PAYMENT_DIR and -d $PAYMENT_DIR) {
  print STDERR "usage: $0 --paymentDir=<DIRECTORY>   option is required and directory must exist\n";
  exit 1;
}
unless (defined $PAYMENT_NUMBER and $PAYMENT_NUMBER =~ /^123$/) {
  print STDERR "usage: $0 --paymentNumber=<VALUE>  option is required and must be 1, 2 or 3\n";
  exit 1;
}
$VERBOSE = 0 unless defined $VERBOSE;

opendir(my $dh, $PAYMENT_DIR);

while (my $file = readdir $dh) {
  unless ($file =~ /^\s*(success|faile?d?)-(\S+)\.txt\s*$/i) {
    print STDERR "Skipping $file which does not match proper format...\n" if ($VERBOSE >= 2);
    next;
  }
  my($pass, $name) = ($1, $2);
  $pass = ($pass =~ /success/) ? 1 : 0;

  open(my $fh, "<", File::Spec->catfile($PAYMENT_DIR, $file));
  my $mentorDate;
  while (my $line = <$fh> ) {
    if ($line =~ /^\s*Date\s*:\s*(.+)\s*$/) {
      $mentorDate = UnixDate(ParseDate($1),  "%Y-%m-%d");
      next;
    }
  }
  if (not defined $mentorDate) {
    print STDERR "\"$file\": Skipping: Inside that file there is no valid Date: header" ;
    next;
  }

  # Find the ticket number for this intern.
  my $entity = LedgerTagFromTicket($ticket, 'Entity');
  if (not defined $entity) {
    print STDERR "\"$file\": \"$ticket\": Skipping: cannot determine Entity from ticket." ;
    next;
  }
  my(@nameComponents) = split(/\s*-\s*/, $name);
  my(@searchTerms);
  foreach my $name (@nameComponents) {
    push(@searchTerms, 'Subject LIKE "' . $name . '"');
  }
  my $ticket = FindUniqueTicket(@searchTerms);
  if (not defined $ticket) {
    foreach my $term (@searchTerms) {
      $ticket = FindUniqueTicket(($term));
      last if (defined $ticket);
    }
  }
  if (not defined $ticket) {
    if (not $INTERACTIVE) {
      print STDERR "\"$file\": Skipped: unable to to find a matching ticket.\n";
      next;
    } else {
      # FIXME: prompt for ticket
      die "interactive mode not yet supported";
    }
  }
  if ($PAYMENT_NUMBER == 1) {
    print STDERR "Sorry, script does not yet support first payment\n";
    exit 1;
  }
  # Check to see if this payment was already made
  my $thisPayDate = PaymentDateByTicket($ticket, $PAYMENT_NUMBER);
  if (defined $thisPayDate) {
    print STDERR "\"$file\": \"$ticket\": Skipped: payment $PAYMENT_NUMBER was already made";
    if ($pass) {
      print STDERR ".\n";
    } else {
      print STDERR "... BIG PROBLEM: the intern actually failed but got this payment.\n";
    }
  }
  # Check to see if previous payment was sent payment
  my $prevPay = $PAYMENT_NUMBER - 1;

  my $lastPayDate = PaymentDateByTicket($ticket, $prevPay);
  if ($pass and (not defined $lastPayDate)) {
    print STDERR "\"$file\": \"$ticket\": Skipped: payment $prevPay was not made yet.\n";
    next;
  }
        
}
###############################################################################
#
# Local variables:
# compile-command: "perl -c rt-outreachy-payment-next.plx"
# perl-indent-level: 2
# End: