use v6.d.PREVIEW;

role Ultramarine::Model::DB {
    method seen-file(:$path) { ... }
    method remove-unseen-files() { ... }

    method is-up-to-date(:$path,:$mtime --> Bool) { ... }
    method ensure-song(:$path,:$mtime,:%metadata) { ... }
    method ensure-file-absent(:$path) { ... }

    method top-folders(--> Iterable) { ... }
    method dir-children-of(:$id) { ... }
    method songs-children-of(:$id) { ... }
}

class Ultramarine::Model::DB::File {
    has Int $.id is required;
    has IO::Path $.path is required;
    has Int $.mtime is required;
    has $.artist_id;
    has $.album_id;
    has %.metadata;
    submethod BUILD(Int() :$!id!, IO() :$!path!,Int() :$!mtime!, Int :$!album_id!, :%!metadata!) {}
}

class Ultramarine::Model::DB::Directory {
    has Int $.id is required;
    has Str $.name is required;
    submethod BUILD(Int() :$!id!, Str() :$!name!) {}
}