#include "node.hpp"

template <typename T>
cmix_proto::PrePre fill_precomputation_pre_message(CMixContext& ctx, T const& rs, T const& ms) {
	if(start_mix(&ctx, rs.size()) != no_error) {
		exit(-1);
	}
	
	if(initialize_mix_randomness(&ctx) != no_error) {
		exit(-1);
	}
	
	cmix_proto::PrePre prepre;
	
	for(size_t i = 0; i < ctx.nr_participants; ++i) {
		size_t len = get_group_element_array_size(&ctx);
		
		prepre.mutable_m_er(i)->resize(len);
		prepre.mutable_r_er(i)->resize(len);
		
		if(encrypt_r_and_multiply(
			&ctx, 
			&(*prepre.mutable_r_er(i))[0],
			&(*prepre.mutable_m_er(i))[0],
			rs.Get(i).data(),
			ms.Get(i).data(),
			i
		) != no_error) {
			exit(-1);
		}
	}
	return prepre;
}

template <typename T>
cmix_proto::PreMix fill_precomputation_mix_message(CMixContext const& ctx, T const& rs, T const& ms) {
	cmix_proto::PreMix premix;
	for(size_t i = 0; i < ctx.nr_participants; ++i) {
		auto new_pos = ctx.permutation[i];
		size_t el_len = get_group_element_array_size(&ctx);
		
		premix.mutable_r_epirs(new_pos)->resize(el_len);
		premix.mutable_m_epirs(new_pos)->resize(el_len);
		
		multiply_s(
			&ctx,
			&(*premix.mutable_r_epirs(new_pos))[0],
			&(*premix.mutable_m_epirs(new_pos))[0],
			rs.Get(i).data(),
			ms.Get(i).data(),
			i
		);
	}
	return premix;
}

template <typename T>
cmix_proto::PrePost fill_precomputation_post_message(CMixContext& ctx, T const& rs, T const& ms) {
	cmix_proto::PrePost prepost;
	
	for(size_t i = 0; i < ctx.nr_participants; ++i) {
		size_t el_len = get_group_element_array_size(&ctx);
		
		prepost.mutable_r_epirs(i)->resize(el_len);
		prepost.mutable_m_epirs(i)->resize(el_len);
		
		post_process(
			&ctx,
			&(*prepost.mutable_r_epirs(i))[0],
			&(*prepost.mutable_m_epirs(i))[0],
			rs.Get(i).data(),
			ms.Get(i).data(),
			i
		);
		
		*prepost.mutable_r_epirs(i) = rs.Get(i);
		*prepost.mutable_m_epirs(i) = ms.Get(i);
	}
	
	return prepost;
}

void Node::handle_node_initialization(const cmix_proto::Initialization& init)
{
	if(network_settings.is_first) {
		set_network_key(&cmix_ctx, init.public_share().data(), init.public_share().size());
	
		cmix_proto::SecretKey sec;
		sec.set_secret_key(init.public_share().data(), init.public_share().size());
		
		next_node.async_send(sec);
	} else {
		size_t len = get_group_element_array_size(&cmix_ctx);
		
		cmix_proto::Initialization n_init;
		n_init.mutable_public_share()->resize(len);
		add_public_share(&cmix_ctx, &(*n_init.mutable_public_share())[0], init.public_share().data());
	
		BOOST_LOG_TRIVIAL(trace) << "Sending intialization";
		next_node.async_send(n_init);
	}
}

void Node::handle_node_secretkey(cmix_proto::SecretKey const& secret)
{
	std::string share = secret.secret_key();
	
	set_network_key(&cmix_ctx, secret.secret_key().data(), secret.secret_key().size());
	
	if(network_settings.is_first) {
		start_precomputation();
	} else {
		next_node.async_send(secret);
	}
}

void Node::handle_node_prepre(cmix_proto::PrePre const& pre) {
	if(network_settings.is_first) {
		cmix_proto::PreMix premix = fill_precomputation_mix_message(cmix_ctx, pre.r_er(), pre.m_er());
		next_node.async_send(premix);
	} else {
		cmix_proto::PrePre prepre = fill_precomputation_pre_message(cmix_ctx, pre.r_er(), pre.m_er());
		next_node.async_send(prepre);
	}
}

void Node::handle_node_premix(cmix_proto::PreMix const& premix) {
	if(network_settings.is_first) {
		cmix_proto::PrePost prepost = fill_precomputation_post_message(cmix_ctx, premix.r_epirs(), premix.m_epirs());
		next_node.async_send(prepost);	
	} else {
		cmix_proto::PreMix n_premix = fill_precomputation_mix_message(cmix_ctx, premix.r_epirs(), premix.m_epirs());
		next_node.async_send(n_premix);
	}
}

void Node::handle_node_prepost(cmix_proto::PrePost const& prepost) {
	if(network_settings.is_first) {
		
	} else {
		cmix_proto::PrePost n_prepost = fill_precomputation_post_message(cmix_ctx, prepost.r_epirs(), prepost.m_epirs());
		next_node.async_send(n_prepost);
	}
}

void Node::handle_node_message(cmix_proto::CMixMessage message)
{
	switch(message.contents_case()) {
		case cmix_proto::CMixMessage::ContentsCase::kInitialization: {
			BOOST_LOG_TRIVIAL(trace) << "Handling initialization";
			handle_node_initialization(message.initialization());
			break;
		}
		case cmix_proto::CMixMessage::ContentsCase::kBye: {
			BOOST_LOG_TRIVIAL(trace) << "Handling bye";
			//Todo: find a nice way to handle network shutdown.
			break;
		}
		case cmix_proto::CMixMessage::ContentsCase::kSecretkey: {
			BOOST_LOG_TRIVIAL(trace) << "Handling SecretKey";
			handle_node_secretkey(message.secretkey());
			break;
		}
		case cmix_proto::CMixMessage::ContentsCase::kPrepre: {
			BOOST_LOG_TRIVIAL(trace) << "Handling PrePre";
			handle_node_prepre(message.prepre());
			break;
		}
		case cmix_proto::CMixMessage::ContentsCase::kPremix: {
			BOOST_LOG_TRIVIAL(trace) << "Handling PreMix";
			handle_node_premix(message.premix());
			break;
		}
		case cmix_proto::CMixMessage::ContentsCase::kPrepost: {
			BOOST_LOG_TRIVIAL(trace) << "Handling PrePost";
			handle_node_prepost(message.prepost());
			break;
		}
		default: {
			BOOST_LOG_TRIVIAL(error) << "handle_node_message: CMixMessage contains unknown contents.";
		}
	}
	prev_node.async_receive([this](cmix_proto::CMixMessage message) {
		handle_node_message(message);
	});
}