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#include <System/Double.h>
#include <System/FrameworkResources.h>
#include <System/String.h>
#include <stdlib.h>
#include <string.h>

#include <sassert.h>

namespace System
{
	unsigned long long rawNaND = 0x7ff8000000000000ULL;
	unsigned long long rawPosInfD = 0x7ff0000000000000ULL;
	unsigned long long rawNegInfD = 0xfff0000000000000ULL;

	const double Double::Epsilon =  4.94066e-324;
	const double Double::MaxValue = 1.79769e+308;
	const double Double::MinValue = -1.79769e+308;
	const double Double::NaN = *(double *)&rawNaND;
	const double Double::PositiveInfinity = *(double *)&rawPosInfD;
	const double Double::NegativeInfinity = *(double *)&rawNegInfD;

	Double::Double(const Double &obj)
		: value(obj.value)
	{
	}

	Double::Double(const double &obj)
		: value(obj)
	{
	}

	int Double::CompareTo(const Double other) const
	{
		if (value > other.value)
			return 1;
		if (value < other.value)
			return -1;
		return 0;
	}

	bool Double::Equals(const Double other) const
	{
		return (*this == other);
	}

	int Double::GetHashCode() const
	{
		return (int)value;
	}

	int Double::GetType() const
	{
		return 14;
	}

	bool Double::TryParse(const String& str, out double* result)
	{
		sassert(!String::IsNullOrEmpty(str), String::Format("str; %s", FrameworkResources::ArgumentNull_Generic));

		sassert(result, String::Format("result; %s", FrameworkResources::ArgumentNull_Generic));

		*result = 0;
		char sign = 0;
		char *sp = const_cast<char*>((const char *)str.ToString());

		if (*sp == '+' || *sp == '-')
			sign = *sp++;

		if (stricmp(sp, "inf") == 0)
		{
			if (!sign || sign == '+')
				*result = PositiveInfinity;
			else
				*result = NegativeInfinity;
		}
		else if (stricmp(sp, "nan") == 0)
			*result = NaN;
		else /* valid number */
			*result = atof(sp);

		return true;
	}

	const String& Double::ToString() const
	{
		return String::Format("%g", value);
	}

	const String& Double::ToString(const double value)
	{
		return String::Format("%g", value);
	}

	Double::operator double() const
	{
		return value;
	}

	bool Double::operator !=(const Double& right) const
	{
		return (value != right.value);
	}

	bool Double::operator ==(const Double& right) const
	{
		return (value == right.value);
	}
}