/* Boomerang gun 1.0, by Foly 
   http://www.jazz2online.com/snippets/50/boomerang-gun/ */

/***Constants***/
const float cMaxSpeed = 10; //The maximum speed the boomerang can have
const float cAcceleration = 0.1; //The acceleration of the boomerang
const float cReturnAccMult = 2; //When the boomerang is returning, this is a multiplier for the acceleration (so a value of 2 let's the boomerang return with 2x acceleration)
const float cVerAccMult = 0.7; //When the boomerang is shot vertical and not returning, this is a multiplier for the acceleration (a higher value lets the boomerang go faster and higher upward)
const float cReturnSpeed = 0.2; //At what speed the boomerang returns back to the player (WARNING! This constant should always be higher than cAcceleration)
const float cReturnRadius = 32; //Radius in pixels at which the player takes the boomerang back


/***Variables***/
array<bool> Returning(32, false);
array<float> Speed(32, cMaxSpeed);

/***Script only functions***/
int FindBulletID(int playerID, int BulletType) {
	int BulletID = -1;
	for (int i = 1; i < jjObjectCount; i++) {
		if (jjObjects[i].isActive && (jjObjects[i].eventID == BulletType) && (jjObjects[i].creatorType == CREATOR::PLAYER) && ((jjObjects[i].creator - 32768) == playerID)) {
			BulletID = i;
			break;
		}
	}
	return BulletID;
}

//Calculates the distance between two points
float Distance(float x1, float y1, float x2, float y2) {
	return sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1));
}

//The square root function
float sqrt(float x) {
	float y = 1.0;
	for (int i = 0; i < 20; i++)
		y = (y + x/y)/2;
	return y;
}

//Determines the absolute value
float abs(float x) {
	if (x < 0)
		x = -x;
	return x;
}

//Determines the sign
int sign(int x) {
	int y;
	if (x < 0)
		y = -1;
	else
		y = 1;
	return y;
}

/***Gameplay functions***/
void onLevelLoad() {
	jjObjectPresets[OBJECT::BLASTERBULLETPU].determineCurAnim(ANIM::TUFBOSS, 3);
	jjObjectPresets[OBJECT::BLASTERBULLETPU].counterEnd = 254;
}

void onMain() {
	int BlasterID, ElectroID;
	float Slope;
	for (int i = 0; i < 32; i++) {
		/*Boomerang gun*/
		BlasterID = FindBulletID(i, OBJECT::BLASTERBULLETPU);
		if (BlasterID != -1) {
			if ((abs(jjObjects[BlasterID].xSpeed) < cReturnSpeed && jjObjects[BlasterID].direction != 0) ||
				(abs(jjObjects[BlasterID].ySpeed) < cReturnSpeed && jjObjects[BlasterID].direction == 0) && !Returning[i])
				Returning[i] = true;

			if (jjObjects[BlasterID].counter == 1)
				jjObjects[BlasterID].determineCurAnim(ANIM::TUFBOSS, 3);
			
			if (Returning[i]) {
				if (Distance(jjPlayers[i].xPos, jjPlayers[i].yPos, jjObjects[BlasterID].xPos, jjObjects[BlasterID].yPos) < cReturnRadius)
					jjKillObject(BlasterID);
				if (Speed[i] < cMaxSpeed)
					Speed[i] = Speed[i] + cAcceleration*2;
				if (jjPlayers[i].xPos == jjObjects[BlasterID].xPos)
					Slope = 100000;
				else
					Slope = (jjPlayers[i].yPos - jjObjects[BlasterID].yPos)/(jjPlayers[i].xPos - jjObjects[BlasterID].xPos);
		
				jjObjects[BlasterID].ySpeed = Speed[i]*sign(jjPlayers[i].yPos - jjObjects[BlasterID].yPos)/sqrt(1 + 1/(Slope*Slope));
				jjObjects[BlasterID].xSpeed = Speed[i]*sign(jjPlayers[i].xPos - jjObjects[BlasterID].xPos)/sqrt(1 + Slope*Slope);
			}
			else {
				if (Speed[i] > 0)
					Speed[i] = Speed[i] - cAcceleration*cReturnAccMult;
				if (jjObjects[BlasterID].direction == 0)
					jjObjects[BlasterID].ySpeed = -Speed[i]*cVerAccMult;
				else
					jjObjects[BlasterID].xSpeed = Speed[i]*jjObjects[BlasterID].direction;
			}
		
			if (jjObjects[BlasterID].counter > 200)
				jjObjects[BlasterID].counter = 30;
		}
		else {
			Speed[i] = cMaxSpeed;
			Returning[i] = false;
			if (i == p.playerID)
				p.noFire = false;
		}
		
		//Both guns only work with one shot, therefore they player shouldn't be able to shoot when he has shot already
		if ((i == p.playerID) && BlasterID != -1)
			p.noFire = true;
	}
}