# 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.

package Bugzilla::Status;

use 5.10.1;
use strict;
use warnings;

# This subclasses Bugzilla::Field::Choice instead of implementing
# ChoiceInterface, because a bug status literally is a special type
# of Field::Choice, not just an object that happens to have the same
# methods.
use parent qw(Bugzilla::Field::Choice Exporter);
@Bugzilla::Status::EXPORT = qw(
  BUG_STATE_OPEN
  SPECIAL_STATUS_WORKFLOW_ACTIONS

  is_open_state
  closed_bug_statuses
);

use Bugzilla::Error;

################################
#####   Initialization     #####
################################

use constant SPECIAL_STATUS_WORKFLOW_ACTIONS => qw(
  none
  duplicate
  change_resolution
  clearresolution
);

use constant DB_TABLE => 'bug_status';

# This has all the standard Bugzilla::Field::Choice columns plus "is_open"
sub DB_COLUMNS {
  return ($_[0]->SUPER::DB_COLUMNS, 'is_open');
}

sub VALIDATORS {
  my $invocant   = shift;
  my $validators = $invocant->SUPER::VALIDATORS;
  $validators->{is_open} = \&Bugzilla::Object::check_boolean;
  $validators->{value}   = \&_check_value;
  return $validators;
}

#########################
# Database Manipulation #
#########################

sub create {
  my $class = shift;
  my $self  = $class->SUPER::create(@_);
  delete Bugzilla->request_cache->{status_bug_state_open};
  add_missing_bug_status_transitions();
  return $self;
}

sub remove_from_db {
  my $self = shift;
  $self->SUPER::remove_from_db();
  delete Bugzilla->request_cache->{status_bug_state_open};
}

###############################
#####     Accessors        ####
###############################

sub is_active { return $_[0]->{'isactive'}; }
sub is_open   { return $_[0]->{'is_open'}; }

sub is_static {
  my $self = shift;
  if ( $self->name eq 'UNCONFIRMED'
    || $self->name eq Bugzilla->params->{'duplicate_or_move_bug_status'})
  {
    return 1;
  }
  return 0;
}

##############
# Validators #
##############

sub _check_value {
  my $invocant = shift;
  my $value    = $invocant->SUPER::_check_value(@_);

  if (grep { lc($value) eq lc($_) } SPECIAL_STATUS_WORKFLOW_ACTIONS) {
    ThrowUserError('fieldvalue_reserved_word',
      {field => $invocant->field, value => $value});
  }
  return $value;
}


###############################
#####       Methods        ####
###############################

sub BUG_STATE_OPEN {
  my $dbh           = Bugzilla->dbh;
  my $request_cache = Bugzilla->request_cache;
  my $cache_key     = 'status_bug_state_open';
  return @{$request_cache->{$cache_key}} if exists $request_cache->{$cache_key};

  my $rows = Bugzilla->memcached->get_config({key => $cache_key});
  if (!$rows) {
    $rows
      = $dbh->selectcol_arrayref('SELECT value FROM bug_status WHERE is_open = 1');
    Bugzilla->memcached->set_config({key => $cache_key, data => $rows});
  }

  $request_cache->{$cache_key} = $rows;
  return @$rows;
}

# Tells you whether or not the argument is a valid "open" state.
sub is_open_state {
  my ($state) = @_;
  return (grep($_ eq $state, BUG_STATE_OPEN) ? 1 : 0);
}

sub closed_bug_statuses {
  my @bug_statuses = Bugzilla::Status->get_all;
  @bug_statuses = grep { !$_->is_open } @bug_statuses;
  return @bug_statuses;
}

sub can_change_to {
  my $self = shift;
  my $dbh  = Bugzilla->dbh;

  if (!ref($self) || !defined $self->{'can_change_to'}) {
    my ($cond, @args, $self_exists);
    if (ref($self)) {
      $cond = '= ?';
      push(@args, $self->id);
      $self_exists = 1;
    }
    else {
      $cond = 'IS NULL';

      # Let's do it so that the code below works in all cases.
      $self = {};
    }

    my $new_status_ids = $dbh->selectcol_arrayref(
      "SELECT new_status
                                                         FROM status_workflow
                                                   INNER JOIN bug_status
                                                           ON id = new_status
                                                        WHERE isactive = 1
                                                          AND old_status $cond
                                                     ORDER BY sortkey", undef, @args
    );

    # Allow the bug status to remain unchanged.
    push(@$new_status_ids, $self->id) if $self_exists;
    $self->{'can_change_to'} = Bugzilla::Status->new_from_list($new_status_ids);
  }

  return $self->{'can_change_to'};
}

sub comment_required_on_change_from {
  my ($self, $old_status) = @_;
  my ($cond, $values)     = $self->_status_condition($old_status);

  my ($require_comment) = Bugzilla->dbh->selectrow_array(
    "SELECT require_comment FROM status_workflow
          WHERE $cond", undef, @$values
  );
  return $require_comment;
}

# Used as a helper for various functions that have to deal with old_status
# sometimes being NULL and sometimes having a value.
sub _status_condition {
  my ($self, $old_status) = @_;
  my @values;
  my $cond = 'old_status IS NULL';

  # We may pass a fake status object to represent the initial unset state.
  if ($old_status && $old_status->id) {
    $cond = 'old_status = ?';
    push(@values, $old_status->id);
  }
  $cond .= " AND new_status = ?";
  push(@values, $self->id);
  return ($cond, \@values);
}

sub add_missing_bug_status_transitions {
  my $bug_status = shift || Bugzilla->params->{'duplicate_or_move_bug_status'};
  my $dbh        = Bugzilla->dbh;
  my $new_status = new Bugzilla::Status({name => $bug_status});

  # Silently discard invalid bug statuses.
  $new_status || return;

  my $missing_statuses = $dbh->selectcol_arrayref(
    'SELECT id
                                                       FROM bug_status
                                                  LEFT JOIN status_workflow
                                                         ON old_status = id
                                                        AND new_status = ?
                                                      WHERE old_status IS NULL',
    undef, $new_status->id
  );

  my $sth = $dbh->prepare(
    'INSERT INTO status_workflow
                             (old_status, new_status) VALUES (?, ?)'
  );

  foreach my $old_status_id (@$missing_statuses) {
    next if ($old_status_id == $new_status->id);
    $sth->execute($old_status_id, $new_status->id);
  }
}

1;

__END__

=head1 NAME

Bugzilla::Status - Bug status class.

=head1 SYNOPSIS

    use Bugzilla::Status;

    my $bug_status = new Bugzilla::Status({ name => 'IN_PROGRESS' });
    my $bug_status = new Bugzilla::Status(4);

    my @closed_bug_statuses = closed_bug_statuses();

    Bugzilla::Status::add_missing_bug_status_transitions($bug_status);

=head1 DESCRIPTION

Status.pm represents a bug status object. It is an implementation
of L<Bugzilla::Object>, and thus provides all methods that
L<Bugzilla::Object> provides.

The methods that are specific to C<Bugzilla::Status> are listed
below.

=head1 METHODS

=over

=item C<closed_bug_statuses>

 Description: Returns a list of C<Bugzilla::Status> objects which can have
              a resolution associated with them ("closed" bug statuses).

 Params:      none.

 Returns:     A list of Bugzilla::Status objects.

=item C<can_change_to>

 Description: Returns the list of active statuses a bug can be changed to
              given the current bug status. If this method is called as a
              class method, then it returns all bug statuses available on
              bug creation.

 Params:      none.

 Returns:     A list of Bugzilla::Status objects.

=item C<comment_required_on_change_from>

=over

=item B<Description>

Checks if a comment is required to change to this status from another
status, according to the current settings in the workflow.

Note that this doesn't implement the checks enforced by the various
C<commenton> parameters--those are checked by internal checks in
L<Bugzilla::Bug>.

=item B<Params>

C<$old_status> - The status you're changing from.

=item B<Returns>

C<1> if a comment is required on this change, C<0> if not.

=back

=item C<add_missing_bug_status_transitions>

 Description: Insert all missing transitions to a given bug status.

 Params:      $bug_status - The value (name) of a bug status.

 Returns:     nothing.

=back

=cut

=head1 B<Methods in need of POD>

=over

=item create

=item BUG_STATE_OPEN

=item is_static

=item is_open_state

=item is_active

=item remove_from_db

=item DB_COLUMNS

=item is_open

=item VALIDATORS

=back
