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#!/usr/bin/perl -T
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.

use 5.10.1;
use strict;
use warnings;

use lib qw(. lib local/lib/perl5);

use Bugzilla;
use Bugzilla::Constants;
use Bugzilla::Error;
use Bugzilla::Token;
use Bugzilla::Status;

my $cgi  = Bugzilla->cgi;
my $dbh  = Bugzilla->dbh;
my $user = Bugzilla->login(LOGIN_REQUIRED);

print $cgi->header();

$user->in_group('admin')
  || ThrowUserError('auth_failure',
  {group => 'admin', action => 'modify', object => 'workflow'});

my $action = $cgi->param('action') || 'edit';
my $token = $cgi->param('token');

sub get_workflow {
  my $dbh      = Bugzilla->dbh;
  my $workflow = $dbh->selectall_arrayref(
    'SELECT old_status, new_status, require_comment
                                             FROM status_workflow'
  );
  my %workflow;
  foreach my $row (@$workflow) {
    my ($old, $new, $type) = @$row;
    $workflow{$old || 0}{$new} = $type;
  }
  return \%workflow;
}

sub load_template {
  my ($filename, $message) = @_;
  my $template = Bugzilla->template;
  my $vars     = {};

  $vars->{'statuses'} = [Bugzilla::Status->get_all];
  $vars->{'workflow'} = get_workflow();
  $vars->{'token'}    = issue_session_token("workflow_$filename");
  $vars->{'message'}  = $message;

  $template->process("admin/workflow/$filename.html.tmpl", $vars)
    || ThrowTemplateError($template->error());
  exit;
}

if ($action eq 'edit') {
  load_template('edit');
}
elsif ($action eq 'update') {
  check_token_data($token, 'workflow_edit');
  my $statuses = [Bugzilla::Status->get_all];
  my $workflow = get_workflow();

  my $sth_insert = $dbh->prepare(
    'INSERT INTO status_workflow (old_status, new_status)
                                    VALUES (?, ?)'
  );
  my $sth_delete = $dbh->prepare(
    'DELETE FROM status_workflow
                                    WHERE old_status = ? AND new_status = ?'
  );
  my $sth_delnul = $dbh->prepare(
    'DELETE FROM status_workflow
                                    WHERE old_status IS NULL AND new_status = ?'
  );

  # Part 1: Initial bug statuses.
  foreach my $new (@$statuses) {
    if ($new->is_open && $cgi->param('w_0_' . $new->id)) {
      $sth_insert->execute(undef, $new->id) unless defined $workflow->{0}->{$new->id};
    }
    else {
      $sth_delnul->execute($new->id);
    }
  }

  # Part 2: Bug status changes.
  foreach my $old (@$statuses) {
    foreach my $new (@$statuses) {
      next if $old->id == $new->id;

      # All transitions to 'duplicate_or_move_bug_status' must be valid.
      if ($cgi->param('w_' . $old->id . '_' . $new->id)
        || ($new->name eq Bugzilla->params->{'duplicate_or_move_bug_status'}))
      {
        $sth_insert->execute($old->id, $new->id)
          unless defined $workflow->{$old->id}->{$new->id};
      }
      else {
        $sth_delete->execute($old->id, $new->id);
      }
    }
  }
  delete_token($token);
  load_template('edit', 'workflow_updated');
}
elsif ($action eq 'edit_comment') {
  load_template('comment');
}
elsif ($action eq 'update_comment') {
  check_token_data($token, 'workflow_comment');
  my $workflow = get_workflow();

  my $sth_update = $dbh->prepare(
    'UPDATE status_workflow SET require_comment = ?
                                    WHERE old_status = ? AND new_status = ?'
  );
  my $sth_updnul = $dbh->prepare(
    'UPDATE status_workflow SET require_comment = ?
                                    WHERE old_status IS NULL AND new_status = ?'
  );

  foreach my $old (keys %$workflow) {

    # Hashes cannot have undef as a key, so we use 0. But the DB
    # must store undef, for referential integrity.
    my $old_id_for_db = $old || undef;
    foreach my $new (keys %{$workflow->{$old}}) {
      my $comment_required = $cgi->param("c_${old}_$new") ? 1 : 0;
      next if ($workflow->{$old}->{$new} == $comment_required);
      if ($old_id_for_db) {
        $sth_update->execute($comment_required, $old_id_for_db, $new);
      }
      else {
        $sth_updnul->execute($comment_required, $new);
      }
    }
  }
  delete_token($token);
  load_template('comment', 'workflow_updated');
}
else {
  ThrowUserError('unknown_action', {action => $action});
}