#include "config.h"

#include <fstream>
#include <iostream>
#include <algorithm>

#include <nlohmann/json.hpp>
using json = nlohmann::json;

template<typename T>
static void readVector(std::vector<T>& v, const json& j) {
	v.clear();
	v.reserve(j.size());
	std::copy(j.begin(), j.end(), std::insert_iterator<std::vector<T>>(v, v.begin()));
}

Config::Config() {
}

Config::~Config() {
}

void from_json(const json& j, Config::RootConfig::AudioConfig& ac) {
	readVector(ac.devices, j.value("devices", json::array()));
}

void from_json(const json& j, Config::RootConfig::ButtonConfig& bc) {
	bc.name = j.value("name", "");
	bc.file = j.value("file", "");
	bc.key = j.value("key", "");
	bc.offset = j.value("offset", 0);
	bc.length = j.value("length", 0);
}

void from_json(const json& j, Config::RootConfig& rc) {
	rc.audio = j.value<Config::RootConfig::AudioConfig>("audio", {});
	json barr = j.value("buttons", json::array());
	if(barr.is_array() && !barr.empty()) {
		readVector(rc.buttons, barr);
	}
	rc.audioPath = j.value("audioPath", "");
}

bool Config::RootConfig::ButtonConfig::isValid() const {
	return !file.empty();
}

void Config::load() {
	std::ifstream stream(file);
	json json;
	if(stream) {
		try {
			stream >> json;
		} catch(nlohmann::detail::parse_error& pe) {
			std::cout << "json error: " << pe.what() << std::endl;
			return;
		}
	}
	rootConfig = json;
}