#ifdef JA2_PRECOMPILED_HEADERS
	#include "JA2 SGP ALL.H"
#else
	#include "Random.h"
#endif

UINT32 guiPreRandomIndex = 0;
UINT32 guiPreRandomNums[ MAX_PREGENERATED_NUMS ];


void InitializeRandom()
{
	// Seed the random-number generator with current time so that
	// the numbers will be different every time we run.
	srand( (unsigned) time(NULL) );

	//Pregenerate all of the random numbers.
	for( guiPreRandomIndex = 0; guiPreRandomIndex < MAX_PREGENERATED_NUMS; guiPreRandomIndex++ )
	{
		guiPreRandomNums[ guiPreRandomIndex ] = rand();
	}
	guiPreRandomIndex = 0;
}

// Returns a pseudo-random integer between 0 and uiRange
UINT32 Random(UINT32 uiRange)
{
	// Always return 0, if no range given (it's not an error)
	if (uiRange == 0)
		return(0);
	return rand() * uiRange / RAND_MAX % uiRange;
}

BOOLEAN Chance( UINT32 uiChance )
{
	//AssertLE(uiChance, 100);
	// lalien: since uiChance calculation is based on different values it can happen that uiChance is > than 100%
	// It's not critical because uiChance >= 100 will always return TRUE. No need to crash the entire game.
	// Make sure that uiChance value is not < than 0, or it can switch to positive

	return (BOOLEAN)(Random( 100 ) < uiChance);
}

UINT32 PreRandom( UINT32 uiRange )
{
	UINT32 uiNum;
	if( !uiRange )
		return 0;
	//Extract the current pregenerated number
	uiNum = guiPreRandomNums[ guiPreRandomIndex ] * uiRange / RAND_MAX % uiRange;
	//Replace the current pregenerated number with a new one.

	//This was removed in the name of optimization.	Uncomment if you hate recycling.
	//guiPreRandomNums[ guiPreRandomIndex ] = rand();

	//Go to the next index.
	guiPreRandomIndex++;
	//if( guiPreRandomIndex >= (UINT32)MAX_PREGENERATED_NUMS )
	//	guiPreRandomIndex = 0;
	// WDS 07/06/2008 fix prerandom
	if (guiPreRandomIndex == MAX_PREGENERATED_NUMS / 2) {
		// [0..(MAX_PREGENERATED_NUMS/2) -1]
		for( unsigned idx = 0; idx < MAX_PREGENERATED_NUMS / 2; ++idx ) {
			guiPreRandomNums[ idx ] = rand();
		}
	} else if (guiPreRandomIndex >= (UINT32)MAX_PREGENERATED_NUMS ) {
		// MAX_PREGENERATED_NUMS/2 .. MAX_PREGENERATED_NUMS-1]
		for( unsigned idx = MAX_PREGENERATED_NUMS / 2; idx < MAX_PREGENERATED_NUMS; ++idx ) {
			guiPreRandomNums[ idx ] = rand();
		}
		guiPreRandomIndex = 0;
	}
	return uiNum;
}

BOOLEAN PreChance( UINT32 uiChance )
{
	//AssertLE(uiChance, 100); 
	// lalien: since uiChance calculation is based on different values it can happen that uiChance is > than 100%
	// It's not critical because uiChance >= 100 will always return TRUE. No need to crash the entire game.
	// Make sure that uiChance value is not < than 0, or it can switch to positive

	return (BOOLEAN)(PreRandom( 100 ) < uiChance);
}