import "Java"
import "luan.modules.lucene.LuceneIndex"


function Index(indexDir)
	local index = LuceneIndex.new(indexDir).table()

	function index.save_document(doc)
		index.Writer( function(writer)
			writer.save_document(doc)
		end )
	end

	function index.delete_documents(terms)
		index.Writer( function(writer)
			writer.delete_documents(terms)
		end )
	end

	function index.get_document(query)
		return index.Searcher( function(searcher)
			local results, _, total_hits = searcher.search(query,1)
			if total_hits == 0 then
				return nil
			elseif total_hits > 1 then
				error( "found " .. total_hits .. " documents" )
			end
			return results()
		end )
	end

	return index
end