/*
 * Copyright (C) 2020 Emeric Poupon
 *
 * This file is part of LMS.
 *
 * LMS 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.
 *
 * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once

#include <Wt/Http/Request.h>

#include "database/Types.hpp"
#include "utils/String.hpp"
#include "SubsonicResponse.hpp"

namespace API::Subsonic
{

	template<typename T>
	std::vector<T>
	getMultiParametersAs(const Wt::Http::ParameterMap& parameterMap, const std::string& paramName)
	{
		std::vector<T> res;

		auto it = parameterMap.find(paramName);
		if (it == parameterMap.end())
			return res;

		for (const std::string& param : it->second)
		{
			auto value {StringUtils::readAs<T>(param)};
			if (value)
				res.emplace_back(std::move(*value));
		}

		return res;
	}

	template<typename T>
	std::vector<T>
	getMandatoryMultiParametersAs(const Wt::Http::ParameterMap& parameterMap, const std::string& param)
	{
		std::vector<T> res {getMultiParametersAs<T>(parameterMap, param)};
		if (res.empty())
			throw RequiredParameterMissingError {param};

		return res;
	}

	template<typename T>
	std::optional<T>
	getParameterAs(const Wt::Http::ParameterMap& parameterMap, const std::string& param)
	{
		std::vector<T> params {getMultiParametersAs<T>(parameterMap, param)};

		if (params.size() != 1)
			return std::nullopt;

		return T { std::move(params.front()) };
	}

	template<typename T>
	T
	getMandatoryParameterAs(const Wt::Http::ParameterMap& parameterMap, const std::string& param)
	{
		auto res {getParameterAs<T>(parameterMap, param)};
		if (!res)
			throw RequiredParameterMissingError {param};

		return *res;
	}
}