DarkflameServer/dCommon/GeneralUtils.h

#pragma once

// C++
#include <stdint.h>
#include <random>
#include <time.h>
#include <string>
#include <type_traits>
#include <functional>
#include <type_traits>
#include <stdexcept>
#include <BitStream.h>

#include "Game.h"

/*!
  \file GeneralUtils.hpp
  \brief A namespace containing general utility functions
 */

 //! The general utils namespace
namespace GeneralUtils {
	//! Converts a plain ASCII string to a UTF-16 string
	/*!
	  \param string The string to convert
	  \param size A size to trim the string to. Default is -1 (No trimming)
	  \return An UTF-16 representation of the string
	 */
	std::u16string ASCIIToUTF16(const std::string_view& string, size_t size = -1);

	//! Converts a UTF-8 String to a UTF-16 string
	/*!
	  \param string The string to convert
	  \param size A size to trim the string to. Default is -1 (No trimming)
	  \return An UTF-16 representation of the string
	 */
	std::u16string UTF8ToUTF16(const std::string_view& string, size_t size = -1);

	//! Internal, do not use
	bool _NextUTF8Char(std::string_view& slice, uint32_t& out);

	//! Converts a UTF-16 string to a UTF-8 string
	/*!
	  \param string The string to convert
	  \param size A size to trim the string to. Default is -1 (No trimming)
	  \return An UTF-8 representation of the string
	 */
	std::string UTF16ToWTF8(const std::u16string_view& string, size_t size = -1);

	/**
	 * Compares two basic strings but does so ignoring case sensitivity
	 * \param a the first string to compare against the second string
	 * \param b the second string to compare against the first string
	 * @return if the two strings are equal
	 */
	bool CaseInsensitiveStringCompare(const std::string& a, const std::string& b);

	// MARK: Bits

	// MARK: Bits

	//! Sets a bit on a numerical value
	template <typename T>
	void SetBit(T& value, size_t index) {
		static_assert(std::is_arithmetic<T>::value, "Not an arithmetic type");

		if (index > (sizeof(T) * 8) - 1) {
			return;
		}

		value |= static_cast<T>(1) << index;
	}

	//! Clears a bit on a numerical value
	template <typename T>
	void ClearBit(T& value, size_t index) {
		static_assert(std::is_arithmetic<T>::value, "Not an arithmetic type");

		if (index > (sizeof(T) * 8 - 1)) {
			return;
		}

		value &= ~(static_cast<T>(1) << index);
	}

	//! Sets a specific bit in a signed 64-bit integer
	/*!
	  \param value The value to set the bit for
	  \param index The index of the bit
	 */
	int64_t SetBit(int64_t value, uint32_t index);

	//! Clears a specific bit in a signed 64-bit integer
	/*!
	  \param value The value to clear the bit from
	  \param index The index of the bit
	 */
	int64_t ClearBit(int64_t value, uint32_t index);

	//! Checks a specific bit in a signed 64-bit integer
	/*!
	  \parma value The value to check the bit in
	  \param index The index of the bit
	  \return Whether or not the bit is set
	 */
	bool CheckBit(int64_t value, uint32_t index);

	// MARK: Random Number Generation

	//! Generates a random number
	/*!
	  \param min The minimum the generate from
	  \param max The maximum to generate to
	 */
	template <typename T>
	inline T GenerateRandomNumber(std::size_t min, std::size_t max) {
		// Make sure it is a numeric type
		static_assert(std::is_arithmetic<T>::value, "Not an arithmetic type");

		if constexpr (std::is_integral_v<T>) {  // constexpr only necessary on first statement
			std::uniform_int_distribution<T> distribution(min, max);
			return distribution(Game::randomEngine);
		} else if (std::is_floating_point_v<T>) {
			std::uniform_real_distribution<T> distribution(min, max);
			return distribution(Game::randomEngine);
		}

		return T();
	}

	bool ReplaceInString(std::string& str, const std::string& from, const std::string& to);

	std::u16string ReadWString(RakNet::BitStream* inStream);

	std::vector<std::wstring> SplitString(std::wstring& str, wchar_t delimiter);

	std::vector<std::u16string> SplitString(std::u16string& str, char16_t delimiter);

	std::vector<std::string> SplitString(const std::string& str, char delimiter);

	std::vector<std::string> GetFileNamesFromFolder(const std::string& folder);

	template <typename T>
	T Parse(const char* value);

	template <>
	inline int32_t Parse(const char* value) {
		return std::stoi(value);
	}

	template <>
	inline int64_t Parse(const char* value) {
		return std::stoll(value);
	}

	template <>
	inline float Parse(const char* value) {
		return std::stof(value);
	}

	template <>
	inline double Parse(const char* value) {
		return std::stod(value);
	}

	template <>
	inline uint32_t Parse(const char* value) {
		return std::stoul(value);
	}

	template <>
	inline uint64_t Parse(const char* value) {
		return std::stoull(value);
	}

	template <typename T>
	bool TryParse(const char* value, T& dst) {
		try {
			dst = Parse<T>(value);

			return true;
		} catch (...) {
			return false;
		}
	}

	template <typename T>
	T Parse(const std::string& value) {
		return Parse<T>(value.c_str());
	}

	template <typename T>
	bool TryParse(const std::string& value, T& dst) {
		return TryParse<T>(value.c_str(), dst);
	}

	template<typename T>
	std::u16string to_u16string(T value) {
		return GeneralUtils::ASCIIToUTF16(std::to_string(value));
	}

	// From boost::hash_combine
	template <class T>
	void hash_combine(std::size_t& s, const T& v) {
		std::hash<T> h;
		s ^= h(v) + 0x9e3779b9 + (s << 6) + (s >> 2);
	}
}