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=head1 NAME

  RT::Search::Googleish

=head1 SYNOPSIS

=head1 DESCRIPTION

Use the argument passed in as a "Google-style" set of keywords

=head1 METHODS

=cut

package RT::Search::Googleish;

use strict;
use warnings;
use base qw(RT::Search);

use Regexp::Common qw/delimited/;

# Only a subset of limit types AND themselves together.  "queue:foo
# queue:bar" is an OR, but "subject:foo subject:bar" is an AND
our %AND = (
    content => 1,
    subject => 1,
);

sub _Init {
    my $self = shift;
    my %args = @_;

    $self->{'Queues'} = delete( $args{'Queues'} ) || [];
    $self->SUPER::_Init(%args);
}

sub Describe {
    my $self = shift;
    return ( $self->loc( "Keyword and intuition-based searching", ref $self ) );
}

sub Prepare {
    my $self = shift;
    my $tql  = $self->QueryToSQL( $self->Argument );

    $RT::Logger->debug($tql);

    $self->TicketsObj->FromSQL($tql);
    return (1);
}

sub QueryToSQL {
    my $self = shift;
    my $query = shift || $self->Argument;

    my %limits;
    $query =~ s/^\s*//;
    while ($query =~ /^\S/) {
        if ($query =~ s/^
                        (?:
                            (\w+)  # A straight word
                            (?:\.  # With an optional .foo
                                ($RE{delimited}{-delim=>q['"]}
                                |[\w-]+  # Allow \w + dashes
                                ) # Which could be ."foo bar", too
                            )?
                        )
                        :  # Followed by a colon
                        ($RE{delimited}{-delim=>q['"]}
                        |\S+
                        ) # And a possibly-quoted foo:"bar baz"
                        \s*//ix) {
            my ($type, $extra, $value) = ($1, $2, $3);
            ($value, my ($quoted)) = $self->Unquote($value);
            $extra = $self->Unquote($extra) if defined $extra;
            $self->Dispatch(\%limits, $type, $value, $quoted, $extra);
        } elsif ($query =~ s/^($RE{delimited}{-delim=>q['"]}|\S+)\s*//) {
            # If there's no colon, it's just a word or quoted string
            my($val, $quoted) = $self->Unquote($1);
            $self->Dispatch(\%limits, $self->GuessType($val, $quoted), $val, $quoted);
        }
    }
    $self->Finalize(\%limits);

    my @clauses;
    for my $subclause (sort keys %limits) {
        next unless @{$limits{$subclause}};

        my $op = $AND{lc $subclause} ? "AND" : "OR";
        push @clauses, "( ".join(" $op ", @{$limits{$subclause}})." )";
    }

    return join " AND ", @clauses;
}

sub Dispatch {
    my $self = shift;
    my ($limits, $type, $contents, $quoted, $extra) = @_;
    $contents =~ s/(['\\])/\\$1/g;
    $extra    =~ s/(['\\])/\\$1/g if defined $extra;

    my $method = "Handle" . ucfirst(lc($type));
    $method = "HandleDefault" unless $self->can($method);
    my ($key, @tsql) = $self->$method($contents, $quoted, $extra);
    push @{$limits->{$key}}, @tsql;
}

sub Unquote {
    # Given a word or quoted string, unquote it if it is quoted,
    # removing escaped quotes.
    my $self = shift;
    my ($token) = @_;
    if ($token =~ /^$RE{delimited}{-delim=>q['"]}{-keep}$/) {
        my $quote = $2 || $5;
        my $value = $3 || $6;
        $value =~ s/\\(\\|$quote)/$1/g;
        return wantarray ? ($value, 1) : $value;
    } else {
        return wantarray ? ($token, 0) : $token;
    }
}

sub Finalize {
    my $self = shift;
    my ($limits) = @_;

    # Apply default "active status" limit if we don't have any status
    # limits ourselves, and we're not limited by id
    if (not $limits->{status} and not $limits->{id}
        and RT::Config->Get('OnlySearchActiveTicketsInSimpleSearch', $self->TicketsObj->CurrentUser)) {
        $limits->{status} = [map {s/(['\\])/\\$1/g; "Status = '$_'"} RT::Queue->ActiveStatusArray()];
    }

    # Respect the "only search these queues" limit if we didn't
    # specify any queues ourselves
    if (not $limits->{queue} and not $limits->{id}) {
        for my $queue ( @{ $self->{'Queues'} } ) {
            my $QueueObj = RT::Queue->new( $self->TicketsObj->CurrentUser );
            next unless $QueueObj->Load($queue);
            my $name = $QueueObj->Name;
            $name =~ s/(['\\])/\\$1/g;
            push @{$limits->{queue}}, "Queue = '$name'";
        }
    }
}

our @GUESS = (
    [ 10 => sub { return "subject" if $_[1] } ],
    [ 20 => sub { return "id" if /^#?\d+$/ } ],
    [ 30 => sub { return "requestor" if /\w+@\w+/} ],
    [ 35 => sub { return "domain" if /^@\w+/} ],
    [ 40 => sub {
          return "status" if RT::Queue->new( $_[2] )->IsValidStatus( $_ )
      }],
    [ 40 => sub { return "status" if /^((in)?active|any)$/i } ],
    [ 50 => sub {
          my $q = RT::Queue->new( $_[2] );
          return "queue" if $q->Load($_) and $q->Id and not $q->Disabled
      }],
    [ 60 => sub {
          my $u = RT::User->new( $_[2] );
          return "owner" if $u->Load($_) and $u->Id and $u->Privileged
      }],
    [ 70 => sub { return "owner" if $_ eq "me" } ],
);

sub GuessType {
    my $self = shift;
    my ($val, $quoted) = @_;

    my $cu = $self->TicketsObj->CurrentUser;
    for my $sub (map $_->[1], sort {$a->[0] <=> $b->[0]} @GUESS) {
        local $_ = $val;
        my $ret = $sub->($val, $quoted, $cu);
        return $ret if $ret;
    }
    return "default";
}

# $_[0] is $self
# $_[1] is escaped value without surrounding single quotes
# $_[2] is a boolean of "was quoted by the user?"
#       ensure this is false before you do smart matching like $_[1] eq "me"
# $_[3] is escaped subkey, if any (see HandleCf)
sub HandleDefault   { return subject   => "Subject LIKE '$_[1]'"; }
sub HandleSubject   { return subject   => "Subject LIKE '$_[1]'"; }
sub HandleFulltext  { return content   => "Content LIKE '$_[1]'"; }
sub HandleContent   { return content   => "Content LIKE '$_[1]'"; }
sub HandleId        { $_[1] =~ s/^#//; return id => "Id = $_[1]"; }
sub HandleStatus    {
    if ($_[1] =~ /^active$/i and !$_[2]) {
        return status => map {s/(['\\])/\\$1/g; "Status = '$_'"} RT::Queue->ActiveStatusArray();
    } elsif ($_[1] =~ /^inactive$/i and !$_[2]) {
        return status => map {s/(['\\])/\\$1/g; "Status = '$_'"} RT::Queue->InactiveStatusArray();
    } elsif ($_[1] =~ /^any$/i and !$_[2]) {
        return 'status';
    } else {
        return status => "Status = '$_[1]'";
    }
}
sub HandleOwner     {
    if (!$_[2] and $_[1] eq "me") {
        return owner => "Owner.id = '__CurrentUser__'";
    }
    elsif (!$_[2] and $_[1] =~ /\w+@\w+/) {
        return owner => "Owner.EmailAddress = '$_[1]'";
    } else {
        return owner => "Owner = '$_[1]'";
    }
}
sub HandleWatcher     {
    return watcher => (!$_[2] and $_[1] eq "me") ? "Watcher.id = '__CurrentUser__'" : "Watcher = '$_[1]'";
}
sub HandleRequestor { return requestor => "Requestor STARTSWITH '$_[1]'";  }
sub HandleDomain    { $_[1] =~ s/^@?/@/; return requestor => "Requestor ENDSWITH '$_[1]'";  }
sub HandleQueue     { return queue     => "Queue = '$_[1]'";      }
sub HandleQ         { return queue     => "Queue = '$_[1]'";      }
sub HandleCf        { return "cf.$_[3]" => "'CF.{$_[3]}' LIKE '$_[1]'"; }

RT::Base->_ImportOverlays();

1;
