//
// CRLib - Simple library for STL replacement in private projects.
// Copyright © 2020 YaPB Development Team <team@yapb.ru>.
//
// This program 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.
//
// This program 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.
// 

#pragma once

// our global namaespace
#define CR_NAMESPACE_BEGIN namespace cr {
#define CR_NAMESPACE_END }

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#include <stddef.h>
#include <limits.h>

CR_NAMESPACE_BEGIN
//
// some useful type definitions
//
namespace types {
   using int8 = signed char;
   using int16 = signed short;
   using int32 = signed int;
   using uint8 = unsigned char;
   using uint16 = unsigned short;
   using uint32 = unsigned int;
   using uint64 = unsigned long long;
}

// make types available for our own use
using namespace cr::types;

//
// global helper stuff
//
template <typename T, size_t N> constexpr size_t bufsize (const T (&)[N]) {
   return N - 1;
}

template <typename T>  constexpr T abs (const T &a) {
   return a > 0 ? a : -a;
}

template <typename T>  constexpr T bit (const T &a) {
   return static_cast <T> (1ULL << a);
}

template <typename T>  constexpr T min (const T &a, const T &b) {
   return a < b ? a : b;
}

template <typename T>  constexpr T max (const T &a, const T &b) {
   return a > b ? a : b;
}

template <typename T> constexpr T square (const T &value) {
   return value * value;
}

template <typename T>  constexpr T clamp (const T &x, const T &a, const T &b) {
   return min (max (x, a), b);
}

template <typename T> const T &fix (const T &type) {
   return type;
}

//
// base classes
//

// simple non-copying base class
class DenyCopying {
protected:
   explicit DenyCopying () = default;
   ~DenyCopying () = default;

public:
   DenyCopying (const DenyCopying &) = delete;
   DenyCopying &operator = (const DenyCopying &) = delete;
};

// singleton for objects
template<typename T> class Singleton : public DenyCopying {
protected:
   Singleton () 
   { }

public:
   static T &instance (); // implemented in cr-alloc.h

public:
   T *operator -> () {
      return &instance ();
   }
};

// simple scoped enum, instaed of enum class
#define CR_DECLARE_SCOPED_ENUM_TYPE(enumName, enumType, ...) \
   CR_NAMESPACE_BEGIN                                        \
   namespace enums {                                         \
      struct _##enumName : protected DenyCopying {           \
         enum Type : enumType {                              \
            __VA_ARGS__                                      \
         };                                                  \
      };                                                     \
   }                                                         \
   CR_NAMESPACE_END                                          \
   using enumName = ::cr::enums::_##enumName::Type;          \

// same as above, but with int32 type
#define CR_DECLARE_SCOPED_ENUM(enumName, ...)                  \
   CR_DECLARE_SCOPED_ENUM_TYPE(enumName, int32, __VA_ARGS__)   \

// exposes global variable from class singleton
#define CR_EXPOSE_GLOBAL_SINGLETON(className, variable)  \
   static auto &variable = className::instance ()        \

CR_NAMESPACE_END

// platform-dependant-stuff
#include <crlib/cr-platform.h>