/**
 * @file
 * Copyright 2013 (c) Anna Schumaker.
 */
#ifndef OCARINA_CORE_FILTER_H
#define OCARINA_CORE_FILTER_H

#include <set>
#include <string>

/**
 * Namespace for searching the tag database.
 */
namespace filter {

	/**
	 * Break a string into words and add each word to an index.
	 *
	 * @param  text  The text to parse.
	 * @param  id    An identifier paired with the text.
	 * @return The lowercase form of the input text.
	 */
	std::string add(const std::string &, unsigned int);

	/**
	 * Search the entire index for identifiers paired with the input text.
	 *
	 * @param  text  The text to search for.
	 * @param  res   The results set will be filled in with the ids found.
	 */
	void search(const std::string &, std::set<unsigned int> &);

	/**
	 * Returns the lowercase version of the input text.
	 *
	 * @param  text  The text to be converted into lowercase.
	 */
	std::string lowercase(const std::string &);

};

#endif /* OCARINA_CORE_FILTER_H */