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# Licensed under the Apache License, Version 2.0 (the "License");
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description 'Determine all leaf cookbooks, where no other cookbook depends on it via metadata.rb'
needs_rules ['ExplicitMetadataDepends']

def to_a
  buffer = Set.new
  @kb.metadatarbs.each do |_, metadata|
    metadata['ExplicitMetadataDepends']&.each do |cb|
      buffer << cb
    end
  end
  @kb.metadatajsons.each do |_, metadata|
    metadata['ExplicitMetadataDepends']&.each do |cb|
      buffer << cb
    end
  end
  (@kb.cookbooks.keys.to_set - buffer).sort.to_a
end

def output
  to_a
end
