// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#pragma once

#include "irrTypes.h"
#include "irrString.h"
#include "path.h"
#include "ILogger.h"
#include "ITimer.h"

// CODE_UNREACHABLE(): Invokes undefined behavior for unreachable code optimization
#if defined(__cpp_lib_unreachable)
#include <utility>
#define CODE_UNREACHABLE() std::unreachable()
#elif defined(__has_builtin)
#if __has_builtin(__builtin_unreachable)
#define CODE_UNREACHABLE() __builtin_unreachable()
#endif
#elif defined(_MSC_VER)
#define CODE_UNREACHABLE() __assume(false)
#endif

#ifndef CODE_UNREACHABLE
#define CODE_UNREACHABLE() (void)0
#endif

namespace irr
{

namespace os
{
class Byteswap
{
public:
	static u16 byteswap(u16 num);
	static s16 byteswap(s16 num);
	static u32 byteswap(u32 num);
	static s32 byteswap(s32 num);
	static u64 byteswap(u64 num);
	static s64 byteswap(s64 num);
	static f32 byteswap(f32 num);
	// prevent accidental swapping of chars
	static inline u8 byteswap(u8 num) { return num; }
	static inline c8 byteswap(c8 num) { return num; }
};

class Printer
{
public:
	// prints out a string to the console out stdout or debug log or whatever
	static void print(const c8 *message, ELOG_LEVEL ll = ELL_INFORMATION);
	static void log(const c8 *message, ELOG_LEVEL ll = ELL_INFORMATION);
	static void log(const wchar_t *message, ELOG_LEVEL ll = ELL_INFORMATION);

	// The string ": " is added between message and hint
	static void log(const c8 *message, const c8 *hint, ELOG_LEVEL ll = ELL_INFORMATION);
	static void log(const c8 *message, const io::path &hint, ELOG_LEVEL ll = ELL_INFORMATION);
	static ILogger *Logger;
};

class Timer
{
public:
	//! returns the current time in milliseconds
	static u32 getTime();

	//! initializes the real timer
	static void initTimer();

	//! sets the current virtual (game) time
	static void setTime(u32 time);

	//! stops the virtual (game) timer
	static void stopTimer();

	//! starts the game timer
	static void startTimer();

	//! sets the speed of the virtual timer
	static void setSpeed(f32 speed);

	//! gets the speed of the virtual timer
	static f32 getSpeed();

	//! returns if the timer currently is stopped
	static bool isStopped();

	//! makes the virtual timer update the time value based on the real time
	static void tick();

	//! returns the current real time in milliseconds
	static u32 getRealTime();

private:
	static void initVirtualTimer();

	static f32 VirtualTimerSpeed;
	static s32 VirtualTimerStopCounter;
	static u32 StartRealTime;
	static u32 LastVirtualTime;
	static u32 StaticTime;
};

} // end namespace os
} // end namespace irr