#pragma once

#include "il2cpp-config.h"

#include <cassert>
#include <cstdlib>
#include <limits>
#include <string>
#include <math.h>
#include <vector>

#include "il2cpp-object-internals.h"
#include "il2cpp-class-internals.h"
#include "il2cpp-tabledefs.h"

#include "vm/PlatformInvoke.h"
#include "vm/StackTrace.h"
#include "vm/PlatformInvoke.h"
#include "vm/StackTrace.h"
#include "utils/StringUtils.h"
#include "utils/StringView.h"
#include "utils/Exception.h"
#include "utils/Output.h"
#include "utils/Runtime.h"

#ifdef _MSC_VER
#define IL2CPP_DEBUG_BREAK() __debugbreak()
#else
#define IL2CPP_DEBUG_BREAK()
#endif

// This function exists to help with generation of callstacks for exceptions
// on iOS and MacOS x64 with clang 6.0 (newer versions of clang don't have this
// problem on x64). There we call the backtrace function, which does not play nicely
// with NORETURN, since the compiler eliminates the method prologue code setting up
// the address of the return frame (which makes sense). So on iOS we need to make
// the NORETURN define do nothing, then we use this dummy method which has the
// attribute for clang on iOS defined to prevent clang compiler errors for
// method that end by throwing a managed exception.
REAL_NORETURN IL2CPP_NO_INLINE static void il2cpp_codegen_no_return()
{
    IL2CPP_UNREACHABLE;
}

#if IL2CPP_COMPILER_MSVC
#define DEFAULT_CALL STDCALL
#else
#define DEFAULT_CALL
#endif

#if defined(__ARMCC_VERSION)
inline double bankers_round(double x)
{
    return __builtin_round(x);
}

inline float bankers_roundf(float x)
{
    return __builtin_roundf(x);
}

#else
inline double bankers_round(double x)
{
    double integerPart;
    if (x >= 0.0)
    {
        if (modf(x, &integerPart) == 0.5)
            return (int64_t)integerPart % 2 == 0 ? integerPart : integerPart + 1.0;
        return floor(x + 0.5);
    }
    else
    {
        if (modf(x, &integerPart) == -0.5)
            return (int64_t)integerPart % 2 == 0 ? integerPart : integerPart - 1.0;
        return ceil(x - 0.5);
    }
}

inline float bankers_roundf(float x)
{
    double integerPart;
    if (x >= 0.0f)
    {
        if (modf(x, &integerPart) == 0.5)
            return (int64_t)integerPart % 2 == 0 ? (float)integerPart : (float)integerPart + 1.0f;
        return floorf(x + 0.5f);
    }
    else
    {
        if (modf(x, &integerPart) == -0.5)
            return (int64_t)integerPart % 2 == 0 ? (float)integerPart : (float)integerPart - 1.0f;
        return ceilf(x - 0.5f);
    }
}

#endif

// returns true if overflow occurs
inline bool il2cpp_codegen_check_mul_overflow_i64(int64_t a, int64_t b, int64_t imin, int64_t imax)
{
    // TODO: use a better algorithm without division
    uint64_t ua = (uint64_t)llabs(a);
    uint64_t ub = (uint64_t)llabs(b);

    uint64_t c;
    if ((a > 0 && b > 0) || (a <= 0 && b <= 0))
        c = (uint64_t)llabs(imax);
    else
        c = (uint64_t)llabs(imin);

    return ua != 0 && ub > c / ua;
}

inline bool il2cpp_codegen_check_mul_oveflow_u64(uint64_t a, uint64_t b)
{
    return b != 0 && (a * b) / b != a;
}

inline int32_t il2cpp_codegen_abs(uint32_t value)
{
    return abs(static_cast<int32_t>(value));
}

inline int32_t il2cpp_codegen_abs(int32_t value)
{
    return abs(value);
}

inline int64_t il2cpp_codegen_abs(uint64_t value)
{
    return llabs(static_cast<int64_t>(value));
}

inline int64_t il2cpp_codegen_abs(int64_t value)
{
    return llabs(value);
}

// Exception support macros
#define IL2CPP_LEAVE(Offset, Target) \
    __leave_target = Offset; \
    goto Target;

#define IL2CPP_END_FINALLY(Id) \
    goto __CLEANUP_ ## Id;

#define IL2CPP_CLEANUP(Id) \
    __CLEANUP_ ## Id:

#define IL2CPP_RETHROW_IF_UNHANDLED(ExcType) \
    if(__last_unhandled_exception) { \
        ExcType _tmp_exception_local = __last_unhandled_exception; \
        __last_unhandled_exception = 0; \
        il2cpp_codegen_raise_exception(_tmp_exception_local); \
        }

#define IL2CPP_JUMP_TBL(Offset, Target) \
    if(__leave_target == Offset) { \
        __leave_target = 0; \
        goto Target; \
        }

#define IL2CPP_END_CLEANUP(Offset, Target) \
    if(__leave_target == Offset) \
        goto Target;

#define IL2CPP_RAISE_MANAGED_EXCEPTION(message) \
    do {\
        il2cpp_codegen_raise_exception((Exception_t*)message);\
        il2cpp_codegen_no_return();\
    } while (0)


template<typename T>
inline void Il2CppCodeGenWriteBarrier(T** targetAddress, T* object)
{
    // TODO
}

void il2cpp_codegen_memory_barrier();

template<typename T>
inline T VolatileRead(T* location)
{
    T result = *location;
    il2cpp_codegen_memory_barrier();
    return result;
}

template<typename T>
inline void VolatileWrite(T* location, T value)
{
    il2cpp_codegen_memory_barrier();
    *location = value;
}

inline void il2cpp_codegen_write_to_stdout(const char* str)
{
    il2cpp::utils::Output::WriteToStdout(str);
}

inline void il2cpp_codegen_write_to_stderr(const char* str)
{
    il2cpp::utils::Output::WriteToStderr(str);
}

inline REAL_NORETURN void il2cpp_codegen_abort()
{
    il2cpp::utils::Runtime::Abort();
    il2cpp_codegen_no_return();
}

inline bool il2cpp_codegen_check_add_overflow(int64_t left, int64_t right)
{
    return (right >= 0 && left > kIl2CppInt64Max - right) ||
        (left < 0 && right < kIl2CppInt64Min - left);
}

inline bool il2cpp_codegen_check_sub_overflow(int64_t left, int64_t right)
{
    return (right >= 0 && left < kIl2CppInt64Min + right) ||
        (right < 0 && left > kIl2CppInt64Max + right);
}

template<bool, class T, class U>
struct pick_first;

template<class T, class U>
struct pick_first<true, T, U>
{
    typedef T type;
};

template<class T, class U>
struct pick_first<false, T, U>
{
    typedef U type;
};

template<class T, class U>
struct pick_bigger
{
    typedef typename pick_first<(sizeof(T) >= sizeof(U)), T, U>::type type;
};

template<typename T, typename U>
inline typename pick_bigger<T, U>::type il2cpp_codegen_multiply(T left, U right)
{
    return left * right;
}

template<typename T, typename U>
inline typename pick_bigger<T, U>::type il2cpp_codegen_add(T left, U right)
{
    return left + right;
}

template<typename T, typename U>
inline typename pick_bigger<T, U>::type il2cpp_codegen_subtract(T left, U right)
{
    return left - right;
}