#pragma once

#include <boost/pfr.hpp>
#include <sp/common/DataBuffer.h>

namespace sp {

template <typename T>
using is_default_serializable = std::bool_constant<(std::is_class_v<T> && std::is_aggregate_v<T>) || !std::is_class_v<T>>;

template <typename T>
static constexpr bool is_default_serializable_v = is_default_serializable<T>::value;

namespace details {

template <typename T>
void WriteRaw(DataBuffer& a_Buffer, T a_Data);

template <typename T>
void WriteFields(DataBuffer& a_Buffer, const T& a_Data);

template <typename T>
void WriteSharedPtr(DataBuffer& a_Buffer, const std::shared_ptr<T>& a_Data);

template <typename T>
void WriteUniquePtr(DataBuffer& a_Buffer, const std::unique_ptr<T>& a_Data);

template <typename T>
void WriteVector(DataBuffer& a_Buffer, const std::vector<T>& a_Data);

template <typename T>
void WriteList(DataBuffer& a_Buffer, const std::list<T>& a_Data);

template <typename K, typename V>
void WriteMap(DataBuffer& a_Buffer, const std::map<K, V>& a_Data);

template <typename K, typename V>
void WriteUnorderedMap(DataBuffer& a_Buffer, const std::unordered_map<K, V>& a_Data);

template <typename K, typename V>
void WritePair(DataBuffer& a_Buffer, const std::pair<K, V>& a_Data);

template <typename T, std::size_t S>
void WriteArray(DataBuffer& a_Buffer, const std::array<T, S>& a_Data);



template <typename T>
void ReadRaw(DataBuffer& a_Buffer, T& a_Data);

template <typename T>
void ReadFields(DataBuffer& a_Buffer, T& a_Data);

template <typename T>
void ReadSharedPtr(DataBuffer& a_Buffer, std::shared_ptr<T>& a_Data);

template <typename T>
void ReadUniquePtr(DataBuffer& a_Buffer, std::unique_ptr<T>& a_Data);

template <typename T>
void ReadVector(DataBuffer& a_Buffer, std::vector<T>& a_Data);

template <typename T>
void ReadList(DataBuffer& a_Buffer, std::list<T>& a_Data);

template <typename K, typename V>
void ReadMap(DataBuffer& a_Buffer, std::map<K, V>& a_Data);

template <typename K, typename V>
void ReadUnorderedMap(DataBuffer& a_Buffer, std::unordered_map<K, V>& a_Data);

template <typename K, typename V>
void ReadPair(DataBuffer& a_Buffer, std::pair<K, V>& a_Data);

template <typename T, std::size_t S>
void ReadArray(DataBuffer& a_Buffer, std::array<T, S>& a_Data);

}  // namespace details




/**
 * \brief Append data to the buffer (converted to big endian)
 */
template <typename T, typename = typename std::enable_if_t<is_default_serializable_v<T>>>
DataBuffer& operator<<(DataBuffer& a_Buffer, const T& a_Data) {
	if constexpr (std::is_class_v<T>) {
		details::WriteFields(a_Buffer, a_Data);
	} else {
		details::WriteRaw(a_Buffer, a_Data);
	}
	return a_Buffer;
}

/**
 * \brief Append a string to the buffer
 * \warning Don't use it for binary data !
 * \param str The string to append
 */
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::string& str);

/**
 * \brief Operator << to write a DataBuffer to an ostream
 */
std::ostream& operator<<(std::ostream& os, const DataBuffer& buffer);

/**
 * \brief Append a pointer to the buffer
 * \param data The data to append
 */
template <typename T, typename = typename std::enable_if_t<!std::is_abstract_v<T>>>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::shared_ptr<T>& a_Data) {
	details::WriteSharedPtr(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Append a pointer to the buffer
 * \param data The data to append
 */
template <typename T, typename = typename std::enable_if_t<!std::is_abstract_v<T>>>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::unique_ptr<T>& a_Data) {
	details::WriteUniquePtr(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Append a vector to the buffer by first writing the size
 * \param data The vector to append
 */
template <typename T>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::vector<T>& a_Data) {
	details::WriteVector(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Append a list to the buffer by first writing the size
 * \param data The list to append
 */
template <typename T>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::list<T>& a_Data) {
	details::WriteList(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Append a map to the buffer by first writing the size
 * \param data The map to append
 */
template <typename K, typename V>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::map<K, V>& a_Data) {
	details::WriteMap(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Append a map to the buffer by first writing the size
 * \param data The map to append
 */
template <typename K, typename V>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::unordered_map<K, V>& a_Data) {
	details::WriteUnorderedMap(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Append a pair to the buffer
 * \param data The pair to append
 */
template <typename K, typename V>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::pair<K, V>& a_Data) {
	details::WritePair(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Append an array to the buffer by first writing the size
 * \param data The buffer to append
 */
template <typename T, std::size_t Size>
DataBuffer& operator<<(DataBuffer& a_Buffer, const std::array<T, Size>& a_Data) {
	details::WriteArray(a_Buffer, a_Data);
	return a_Buffer;
}





/**
 * \brief Read some data from the buffer and assign to desired variable
 */
template <typename T, typename = typename std::enable_if_t<is_default_serializable_v<T>>>
DataBuffer& operator>>(DataBuffer& a_Buffer, T& a_Data) {
	if constexpr (std::is_class_v<T>) {
		details::ReadFields(a_Buffer, a_Data);
	} else {
		details::ReadRaw(a_Buffer, a_Data);
	}
	return a_Buffer;
}

/**
 * \brief Read some data from the buffer and assign to the new buffer
 * \param data The buffer to assign
 */
DataBuffer& operator>>(DataBuffer& a_Buffer, DataBuffer& a_Data);

/**
 * \brief Read a string from the buffer
 * \param str The string to assign in the new buffer
 * \warning Don't use it for binary data !
 */
DataBuffer& operator>>(DataBuffer& a_Buffer, std::string& str);

/**
 * \brief Read a pointer
 */
template <typename T, typename = typename std::enable_if_t<!std::is_abstract_v<T>>>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::shared_ptr<T>& a_Data) {
	details::ReadSharedPtr(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Read a pointer
 */
template <typename T, typename = typename std::enable_if_t<!std::is_abstract_v<T>>>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::unique_ptr<T>& a_Data) {
	details::ReadUniquePtr(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Read a vector (size + data) from the buffer
 * \pre The vector is assumed to be empty
 */
template <typename T>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::vector<T>& a_Data) {
	details::ReadVector(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Read a list (size + data) from the buffer
 * \pre The list is assumed to be empty
 */
template <typename T>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::list<T>& a_Data) {
	details::ReadList(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Read a map (size + data) from the buffer
 * \pre The map is assumed to be empty
 */
template <typename K, typename V>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::map<K, V>& a_Data) {
	details::ReadMap(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Read a map (size + data) from the buffer
 * \pre The map is assumed to be empty
 */
template <typename K, typename V>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::unordered_map<K, V>& a_Data) {
	details::ReadUnorderedMap(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Read a pair
 */
template <typename K, typename V>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::pair<K, V>& a_Data) {
	details::ReadPair(a_Buffer, a_Data);
	return a_Buffer;
}

/**
 * \brief Read an array from the buffer
 */
template <std::size_t Size, typename T>
DataBuffer& operator>>(DataBuffer& a_Buffer, std::array<T, Size>& a_Data) {
	details::ReadArray(a_Buffer, a_Data);
	return a_Buffer;
}





namespace details {

template <typename T>
void WriteRaw(DataBuffer& a_Buffer, T a_Data) {
	SwapBytes(a_Data);
	a_Buffer.Append(a_Data);
}

template <typename T>
void WriteFields(DataBuffer& a_Buffer, const T& a_Data) {
	boost::pfr::for_each_field(a_Data, [&a_Buffer](const auto& a_Field) { a_Buffer << a_Field; });
}

template <typename T>
void WriteSharedPtr(DataBuffer& a_Buffer, const std::shared_ptr<T>& a_Data) {
	a_Buffer << *a_Data;
}

template <typename T>
void WriteUniquePtr(DataBuffer& a_Buffer, const std::unique_ptr<T>& a_Data) {
	a_Buffer << *a_Data;
}

template <typename T>
void WriteVector(DataBuffer& a_Buffer, const std::vector<T>& a_Data) {
	a_Buffer << VarInt{a_Data.size()};
	for (const auto& element : a_Data) {
		a_Buffer << element;
	}
}

template <typename T>
void WriteList(DataBuffer& a_Buffer, const std::list<T>& a_Data) {
	a_Buffer << VarInt{a_Data.size()};
	for (const auto& element : a_Data) {
		a_Buffer << element;
	}
}

template <typename K, typename V>
void WriteMap(DataBuffer& a_Buffer, const std::map<K, V>& a_Data) {
	a_Buffer << VarInt{a_Data.size()};
	for (const auto& [key, value] : a_Data) {
		a_Buffer << key << value;
	}
}

template <typename K, typename V>
void WriteUnorderedMap(DataBuffer& a_Buffer, const std::unordered_map<K, V>& a_Data) {
	a_Buffer << VarInt{a_Data.size()};
	for (const auto& [key, value] : a_Data) {
		a_Buffer << key << value;
	}
}

template <typename K, typename V>
void WritePair(DataBuffer& a_Buffer, const std::pair<K, V>& a_Data) {
	a_Buffer << a_Data.first << a_Data.second;
}

template <typename T, std::size_t S>
void WriteArray(DataBuffer& a_Buffer, const std::array<T, S>& a_Data) {
	for (const auto& element : a_Data) {
		a_Buffer << element;
	}
}





template <typename T>
void ReadRaw(DataBuffer& a_Buffer, T& a_Data) {
	a_Buffer.Read(a_Data);
	SwapBytes(a_Data);
}

template <typename T>
void ReadFields(DataBuffer& a_Buffer, T& a_Data) {
	boost::pfr::for_each_field(a_Data, [&a_Buffer](auto& a_Field) { a_Buffer >> a_Field; });
}

template <typename T>
void ReadSharedPtr(DataBuffer& a_Buffer, std::shared_ptr<T>& a_Data) {
	a_Data = std::make_shared<T>();
	a_Buffer >> *a_Data;
}

template <typename T>
void ReadUniquePtr(DataBuffer& a_Buffer, std::unique_ptr<T>& a_Data) {
	a_Data = std::make_unique<T>();
	a_Buffer >> *a_Data;
}

template <typename T>
void ReadVector(DataBuffer& a_Buffer, std::vector<T>& a_Data) {
	VarInt arraySize;
	a_Buffer >> arraySize;
	for (std::size_t i = 0; i < arraySize.GetValue(); i++) {
		T newElement;
		a_Buffer >> newElement;
		a_Data.push_back(newElement);
	}
}

template <typename T>
void ReadList(DataBuffer& a_Buffer, std::list<T>& a_Data) {
	VarInt arraySize;
	a_Buffer >> arraySize;
	for (std::size_t i = 0; i < arraySize.GetValue(); i++) {
		T newElement;
		a_Buffer >> newElement;
		a_Data.push_back(newElement);
	}
}

template <typename K, typename V>
void ReadMap(DataBuffer& a_Buffer, std::map<K, V>& a_Data) {
	VarInt mapSize;
	a_Buffer >> mapSize;
	for (std::size_t i = 0; i < mapSize.GetValue(); i++) {
		K newKey;
		V newValue;
		a_Buffer >> newKey >> newValue;
		a_Data.emplace(newKey, newValue);
	}
}

template <typename K, typename V>
void ReadUnorderedMap(DataBuffer& a_Buffer, std::unordered_map<K, V>& a_Data) {
	VarInt mapSize;
	a_Buffer >> mapSize;
	for (std::size_t i = 0; i < mapSize.GetValue(); i++) {
		K newKey;
		V newValue;
		a_Buffer >> newKey >> newValue;
		a_Data.emplace(newKey, newValue);
	}
}

template <typename K, typename V>
void ReadPair(DataBuffer& a_Buffer, std::pair<K, V>& a_Data) {
	a_Buffer >> a_Data.first >> a_Data.a_Data;
}

template <typename T, std::size_t S>
void ReadArray(DataBuffer& a_Buffer, std::array<T, S>& a_Data) {
	for (std::size_t i = 0; i < S; i++) {
		T newElement;
		a_Buffer >> newElement;
		a_Data[i] = newElement;
	}
}


}  // namespace details

}  // namespace sp