#include "../Platform/stdafx.h"

#include "JavaMath.h"

Random Math::rand = Random();

// Returns a double value with a positive sign, greater than or equal to 0.0 and
// less than 1.0. Returned values are chosen pseudorandomly with (approximately)
// uniform distribution from that range. When this method is first called, it
// creates a single new pseudorandom-number generator, exactly as if by the
// expression
//
// new java.util.Random
// This new pseudorandom-number generator is used thereafter for all calls to
// this method and is used nowhere else. This method is properly synchronized to
// allow correct use by more than one thread. However, if many threads need to
// generate pseudorandom numbers at a great rate, it may reduce contention for
// each thread to have its own pseudorandom-number generator.
//
// Returns:
// a pseudorandom double greater than or equal to 0.0 and less than 1.0.
double Math::random() { return Math::rand.nextDouble(); }

// Returns the closest long to the argument. The result is rounded to an integer
// by adding 1/2, taking the floor of the result, and casting the result to type
// long. In other words, the result is equal to the value of the expression:
//(long)Math.floor(a + 0.5d)
// Special cases:
//
// If the argument is NaN, the result is 0.
// If the argument is negative infinity or any value less than or equal to the
// value of Long.MIN_VALUE, the result is equal to the value of Long.MIN_VALUE.
// If the argument is positive infinity or any value greater than or equal to
// the value of Long.MAX_VALUE, the result is equal to the value of
// Long.MAX_VALUE. Parameters: a - a floating-point value to be rounded to a
// long. Returns: the value of the argument rounded to the nearest long value.
int64_t Math::round(double d) {
    // 4jcraft fixes the fact that if double is a huge
    // number than the cast of d to int64_t overflows

    d = floor(d + 0.5);

    // if smaller or bigger than representable int64 than return the max
    if (d >= (double)INT64_MAX) {
        return INT64_MAX;

    } else if (d <= (double)INT64_MIN) {
        return INT64_MIN;
    }

    return (int64_t)d;
}

int Math::_max(int a, int b) { return a > b ? a : b; }

int Math::_min(int a, int b) { return a < b ? a : b; }

float Math::_max(float a, float b) { return a > b ? a : b; }

float Math::_min(float a, float b) { return a < b ? a : b; }

float Math::wrapDegrees(float input) {
    while (input >= 360.0f) input -= 360.0f;
    if (input >= 180.0f) input -= 360.0f;
    if (input < -180.0f) input += 360.0f;
    return input;
}

double Math::wrapDegrees(double input) {
    while (input >= 360.0) input -= 360.0;
    if (input >= 180.0) input -= 360.0;
    if (input < -180.0) input += 360.0;
    return input;
}