use v6.d;
use MaildirIndexer::Index;
unit class MaildirIndexer::Index::ByRef does MaildirIndexer::Index;
use MaildirIndexer::LogTimelineSchema;
use MaildirIndexer::Email;

has Str %!id-for-file;
has SetHash %!mailboxes-for-id;

method dump() {
    say "{.key} → {.value}" for %!id-for-file;
    say "{.key} ⇒ {.value.perl}" for %!mailboxes-for-id;
}

method add-mail(MaildirIndexer::Email:D $email, Str:D $mailbox --> Nil) {
    MaildirIndexer::LogTimelineSchema::Index::Add.log: :class('ByRef'),:$mailbox, -> {
        # ignore adding the same file twice, files in maildirs are
        # immutable
        return if %!id-for-file{ $email.path }:exists;

        my $id = $email.message-id or return;
        %!id-for-file{ $email.path } = $id;
        %!mailboxes-for-id{ $id }{$mailbox}=1;
        return;
    }
}

method del-path(IO:D $file, Str:D $mailbox --> Nil) {
    MaildirIndexer::LogTimelineSchema::Index::Rm.log: :class('ByRef'),:$mailbox, -> {
        my $id = %!id-for-file{ $file.path }:delete or return;
        with %!mailboxes-for-id{ $id } -> $boxes {
            $boxes{$mailbox}:delete;
        }
        return;
    }
}

method mailbox-for-email(MaildirIndexer::Email:D $email --> Str) {
    my Str $result;
    MaildirIndexer::LogTimelineSchema::Index::Find.log: :class('ByRef'), -> {
        for |$email.refs() -> $ref {
            with %!mailboxes-for-id{$ref} { $result = .keys.sort.[0] }
        }
    }
    return $result;
}