vec2 Min(vec2 a, vec2 b) {
    vec2 r;
    r.x = Min(a.x, b.x);
    r.y = Min(a.y, b.y);
    return r;
}

vec2 Max(vec2 a, vec2 b) {
    vec2 r;
    r.x = Max(a.x, b.x);
    r.y = Max(a.y, b.y);
    return r;
}


int32 Sign(real32 a) {
    if (a < 0) { return -1; }
    else if (a > 0) { return 1; }
    else { return 0; }
}


// This function takes a pointer to a vec2. That means when we change the values of dir, we are
// changing the values at the memory address we passed in!
// We WANT the value of dir to change based on the computation of this function. IMPORTANT
// This uses the SeparatingAxisTheorem
// The dir value will tell us which direction to move to push rectangle A out of rectangle B
bool RectTest(Rect a, Rect b, vec2 aPosition, vec2 bPosition, vec2 *dir) {

    Rect aGlobal;
    aGlobal.min = Add(a.min, aPosition);
    aGlobal.max = Add(a.max, aPosition);

    Rect bGlobal;
    bGlobal.min = Add(b.min, bPosition);
    bGlobal.max = Add(b.max, bPosition);

    r32 lengthX = Min(aGlobal.max.x, bGlobal.max.x) - Max(aGlobal.min.x, bGlobal.min.x);
    r32 lengthY = Min(aGlobal.max.y, bGlobal.max.y) - Max(aGlobal.min.y, bGlobal.min.y);

    // This tells us if there is separation on either axis
    if (lengthX < 0) { return false; }
    if (lengthY < 0) { return false; }
    // If we get here there is no separation, and we want to find the axis with the least length

    r32 posDiffX = bPosition.x - aPosition.x;
    r32 posDiffY = bPosition.y - aPosition.y;

    if (lengthX < lengthY) {
        dir->x = lengthX * -Sign(posDiffX);
    }
    else {
        dir->y = lengthY * -Sign(posDiffY);
    }

    return true;
}

/ *
   USAGE CODE FOR RectTest()

    // @NOTE: this is the rectangle defined RELATIVE to the position of our guy
    // We can use these relative min/max to compute the global min and max points using them
    // and position
    vec2 dir;
   bool collides = RectTest(gameMem->guy1.rect, gameMem->guy2.rect,
                             gameMem->guy1.pos, gameMem->guy2.pos, &dir);

    // @TODO: draw guy2 with a different color, if it's colldiing with guy1
    uint8 guy2Color = 128;

    // The dir variable tells us which direction to move to push the first rectangle out of the second.
    // so if we want to push guy2 away from guy1 we would subtract the direction, if we want to push guy1
    // away from guy2 we'd Add the direction to the position.
    if (collides) {
        //gameMem->guy1.pos = Add(gameMem->guy1.pos, dir);
        gameMem->guy2.pos = Sub(gameMem->guy2.pos, dir);
    }
*/