#pragma once

#include <fingerprints.hpp>
#include <image_io.hpp>

#include <boost/serialization/access.hpp>
#include <boost/serialization/vector.hpp>

#include <string>
#include <vector>

template <typename Fingerprint, typename Traits = fingerprint_traits<Fingerprint>>
struct image_database {
	using index = size_t;

	static auto fingerprint_name() { return Fingerprint::name(); }
	auto filename(index i) const { return filenames[i]; }
	auto fingerprint(index i) const { return fingerprints[i]; }
	auto size() const { return fingerprints.size(); }

	void add(std::string const & filename){
		auto && image = open_image(filename);
		auto && fingerprint = Traits::calculate(image);

		filenames.push_back(filename);
		fingerprints.push_back(fingerprint);
	}

	//! returns a list of distances along with their index
	auto distances_for_image(av::frame const & image) const {
		std::vector<std::pair<typename Traits::distance_type, index>> ret;
		ret.reserve(size());

		auto const pre_fingerprint = Traits::pre_calculate(image);
		for(auto&& fingerprint : fingerprints){
			ret.emplace_back(Traits::distance(fingerprint, pre_fingerprint), ret.size());
		}
		return ret;
	}

private:
	friend class boost::serialization::access;
	template<class Archive>
	void serialize(Archive & ar, const unsigned int /*version*/){
		ar & filenames;
		ar & fingerprints;
	}

	std::vector<std::string> filenames;
	std::vector<Fingerprint> fingerprints;
};