#include "helpers.h"

#include <fstream>

using nlohmann::json;

using std::endl;
using std::ifstream;
using std::istream;
using std::ostream;
using std::string;

bool read_config_json(json& cfg, const string& filename, ostream* log)
{
	ifstream cfg_file(filename);

	if (!cfg_file.is_open())
	{
		if (nullptr != log)
		{
			*log << "Could not open config file" << endl;
		}
		return false;
	}

	return read_config_json(cfg, cfg_file, log);
}

bool read_config_json(json& cfg, istream& in, ostream* log)
{
	// Parse with comments
	try
	{
		cfg = json::parse(in, nullptr, true, true);
	}
	catch (const std::exception &e)
	{
		if (nullptr != log)
		{
			*log << e.what() << endl;
		}
		return false;
	}

	return true;
}

bool json_extract(const json& j, const string& key, string& out)
{
	bool result = false;

	if (j.contains(key) && j[key].is_string())
	{
		out = j[key];
		result = true;
	}

	return result;
}

bool json_extract(const json& j, const string& key, int& out)
{
	bool result = false;

	if (j.contains(key) && j[key].is_number_integer())
	{
		out = j[key];
		result = true;
	}

	return result;
}

bool json_extract(const json& j, const string& key, bool& out)
{
	bool result = false;

	if (j.contains(key) && j[key].is_boolean())
	{
		out = j[key];
		result = true;
	}

	return result;
}

bool json_extract(const json& j, const string& key, uint16_t& out)
{
	bool result = false;

	if (j.contains(key) && j[key].is_number_integer())
	{
		if ((j[key] >= 0) && (j[key] <= UINT16_MAX))
		{
			out = j[key];
			result = true;
		}
	}

	return result;
}