/*
U2FDevice - A program to allow Raspberry Pi Zeros to act as U2F tokens
Copyright (C) 2018  Michael Kuc

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#include "Controller.hpp"
#include "u2f.hpp"
#include <iostream>
#include "IO.hpp"
#include "LED.hpp"

using namespace std;

Controller::Controller(const uint32_t startChannel)
	: channels{}, currChannel{ startChannel }
{}

void Controller::handleTransaction()
{
	auto msg = U2FMessage::readNonBlock();

	if (!msg)
		return;

	handleTransaction(*msg);
}

void Controller::handleTransaction(const U2FMessage& msg)
{
	try
	{
		if (channels.size() != 0 && chrono::duration_cast<chrono::seconds>(chrono::system_clock::now() - lastMessage) < chrono::seconds(5))
			toggleACTLED();
		else
			enableACTLED(false);
	}
	catch (runtime_error& ignored)
	{}

	lastMessage = chrono::system_clock::now();

	auto opChannel = msg.cid;

	if (msg.cmd == U2FHID_INIT)
	{
		opChannel = nextChannel();
		auto channel = Channel{ opChannel };

		try
		{
			channels.emplace(opChannel, channel); //In case of wrap-around replace existing one
		}
		catch (...)
		{
			channels.insert(make_pair(opChannel, channel));
		}
	}

#ifdef DEBUG_MSGS
	clog << "Message:" << endl;
	clog << "cid: " << msg.cid << ", cmd: " << static_cast<unsigned int>(msg.cmd) << endl;
#endif

	channels.at(opChannel).handle(msg);
}

uint32_t Controller::nextChannel()
{
	do
		currChannel++;
	while (currChannel == 0xFFFFFFFF || currChannel == 0);

	return currChannel;
}