#include "NetworkProtocol.h"
#include <exception>


namespace FRG {

std::string makeStateMessage(const nlohmann::json& state)
{
	return nlohmann::json{
		{"protocolVersion", kGameProtocolVersion},
		{"type", "state"},
		{"payload", state}
	}.dump();
}

bool parseStateMessage(
	const std::string& message, nlohmann::json& state,
	std::string& error)
{
	try {
		const nlohmann::json envelope = nlohmann::json::parse(message);
		if (!envelope.is_object()) {
			error = "message must be a JSON object";
			return false;
		}
		if (envelope.value("protocolVersion", -1) != kGameProtocolVersion) {
			error = "unsupported protocol version";
			return false;
		}
		if (envelope.value("type", std::string()) != "state") {
			error = "unsupported message type";
			return false;
		}
		if (!envelope.contains("payload") || !envelope["payload"].is_object()) {
			error = "state payload must be an object";
			return false;
		}
		state = envelope["payload"];
		error.clear();
		return true;
	} catch (const std::exception& exception) {
		error = exception.what();
		return false;
	}
}

} // namespace FRG