/*
 * SPDX-FileCopyrightText: 2013, 2015 ljfa-ag <ljfa-ag@web.de>
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 */

/*
 * libnbt++ - A library for the Minecraft Named Binary Tag format.
 * Copyright (C) 2013, 2015  ljfa-ag
 *
 * This file is part of libnbt++.
 *
 * libnbt++ is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * libnbt++ 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with libnbt++.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef TAG_PRIMITIVE_H_INCLUDED
#define TAG_PRIMITIVE_H_INCLUDED

#include "crtp_tag.h"
#include "primitive_detail.h"
#include "io/stream_reader.h"
#include "io/stream_writer.h"
#include <istream>
#include <sstream>

namespace nbt
{

	/**
	 * @brief Tag that contains an integral or floating-point value
	 *
	 * Common class for tag_byte, tag_short, tag_int, tag_long, tag_float and
	 * tag_double.
	 */
	template <class T>
	class tag_primitive final : public detail::crtp_tag<tag_primitive<T>>
	{
	  public:
		/// The type of the value
		typedef T value_type;

		/// The type of the tag
		static constexpr tag_type type = detail::get_primitive_type<T>::value;

		// Constructor
		constexpr tag_primitive(T val = 0) noexcept : value(val) {}

		// Getters
		operator T&()
		{
			return value;
		}
		constexpr operator T() const
		{
			return value;
		}
		constexpr T get() const
		{
			return value;
		}

		// Setters
		tag_primitive& operator=(T val)
		{
			value = val;
			return *this;
		}
		void set(T val)
		{
			value = val;
		}

		void read_payload(io::stream_reader& reader) override;
		void write_payload(io::stream_writer& writer) const override;

	  private:
		T value;
	};

	template <class T>
	bool operator==(const tag_primitive<T>& lhs, const tag_primitive<T>& rhs)
	{
		return lhs.get() == rhs.get();
	}
	template <class T>
	bool operator!=(const tag_primitive<T>& lhs, const tag_primitive<T>& rhs)
	{
		return !(lhs == rhs);
	}

	// Typedefs that should be used instead of the template tag_primitive.
	typedef tag_primitive<int8_t> tag_byte;
	typedef tag_primitive<int16_t> tag_short;
	typedef tag_primitive<int32_t> tag_int;
	typedef tag_primitive<int64_t> tag_long;
	typedef tag_primitive<float> tag_float;
	typedef tag_primitive<double> tag_double;

	// Explicit instantiation declarations
#if defined(_MSC_VER) && defined(MeshMC_nbt___EXPORTS)
	template class NBT_EXPORT tag_primitive<int8_t>;
	template class NBT_EXPORT tag_primitive<int16_t>;
	template class NBT_EXPORT tag_primitive<int32_t>;
	template class NBT_EXPORT tag_primitive<int64_t>;
	template class NBT_EXPORT tag_primitive<float>;
	template class NBT_EXPORT tag_primitive<double>;
#else
	extern template class NBT_EXPORT tag_primitive<int8_t>;
	extern template class NBT_EXPORT tag_primitive<int16_t>;
	extern template class NBT_EXPORT tag_primitive<int32_t>;
	extern template class NBT_EXPORT tag_primitive<int64_t>;
	extern template class NBT_EXPORT tag_primitive<float>;
	extern template class NBT_EXPORT tag_primitive<double>;
#endif

	template <class T>
	void tag_primitive<T>::read_payload(io::stream_reader& reader)
	{
		reader.read_num(value);
		if (!reader.get_istr()) {
			std::ostringstream str;
			str << "Error reading tag_" << type;
			throw io::input_error(str.str());
		}
	}

	template <class T>
	void tag_primitive<T>::write_payload(io::stream_writer& writer) const
	{
		writer.write_num(value);
	}

} // namespace nbt

#endif // TAG_PRIMITIVE_H_INCLUDED
