#!/usr/bin/env perl

use lib ($ENV{RLWRAP_FILTERDIR} or ".");
use RlwrapFilter;
use strict;


my $filter = new RlwrapFilter;
my $name = $filter -> name;

$filter -> help_text("");
$filter -> completion_handler(\&complete);
$filter -> run;

sub users {
    return qx(./passman list user);
}

sub groups {
    return qx(./passman list group);
}
sub passwords {
    return qx(./passman list pass);
}


sub complete {
    my ($line, $prefix, @completions) = @_;

    my @base = ('get','modify',
                'list','info',
                'passwd',
                'help',
                'add','del',
                'manage',
                'promote','demote');

    my @words = split /\s+/, $line;
    my $nwords = scalar @words;

    # only count completed words
    $nwords-- if $prefix;

    my @result = ();
    if($nwords == 0) {
        @result = @base;

    } else {
        # try to avoid suggesting completions in the middle of a line
        return '' unless grep /$prefix$/, $words[-1];
        my $first = $words[0];

        if($first eq 'passwd') {
            @result = ();

        } elsif($nwords == 1
                && $first eq 'help') {
            @result = @base;

        } elsif($nwords == 1
                && ($first eq 'get'
                    || $first eq 'modify')) {
            @result = &passwords;

        } elsif($first eq 'list'
                || $first eq 'info'
                || $first eq 'add'
                || $first eq 'del') {
            if($nwords == 1) {
                @result = ('user','group','pass');

            } elsif($nwords == 2) {
                my $second = $words[1];

                if($second eq 'user') {
                    @result = &users;

                } elsif($second eq 'group') {
                    @result = &groups;

                } elsif($second eq 'pass') {
                    @result = &passwords;
                }
            }
        } elsif($nwords == 1
                && ($first eq 'promote'
                    || $first eq 'demote')) {
            @result = &users;

        } elsif($first eq 'manage') {
            if($nwords == 1) {
                @result = ('user','pass');

            } else {
                my $second = $words[1];

                if($nwords == 2) {
                    if($second eq 'user') {
                        @result = &users;

                    } elsif($second eq 'pass') {
                        @result = &passwords;

                    }
                } elsif($nwords == 3) {
                    my @temp = &groups;
                    @result = map { '-' . $_ } @temp;
                    push @result, map { '+' . $_ } @temp;
                }
            }
        }
    }

    chomp(@result);
    return grep /^$prefix/, @result;
}