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extern crate nalgebra as na;

use scad_macros::*;
use scad_element::ScadElement::*;
use scad_element::CircleType;
use scad_object::*;



/**
  Creates a cube that is centered on the specified axis
*/
pub fn centered_cube(size: na::Vector3<f32>, centering: (bool, bool, bool)) -> ScadObject
{
    let (x,y,z) = centering;

    let mut offset = vec3(0.,0.,0.);
    offset.x = if x {size.x} else {0.};
    offset.y = if y {size.y} else {0.};
    offset.z = if z {size.z} else {0.};

    offset /= -2.; 

    let mut translation = ScadObject::new(Translate(offset));
    translation.add_child(ScadObject::new(Cube(size)));
    translation
}

pub fn centered_square(size: na::Vector2<f32>, centering: (bool, bool)) -> ScadObject
{
    let (x,y) = centering;
    let offset = vec2(
            if x {size.x} else {0.},
            if y {size.y} else {0.}
        ) / -2.;

    let mut translation = ScadObject::new(Translate2d(offset));
    translation.add_child(ScadObject::new(Square(size)));
    translation
}

/**
  Creates a cylinder that is centered along all axis
*/
pub fn centered_cylinder(height: f32, size: CircleType) -> ScadObject
{
    let mut translation = ScadObject::new(Translate(vec3(0., 0., -height / 2.)));
    let cylinder = ScadObject::new(Cylinder(height, size));

    translation.add_child(cylinder);
    translation
}



#[cfg(test)]
mod tests
{
    extern crate nalgebra as na;

    use super::*;

    #[test]
    fn cube_center_x()
    {
        let obj = centered_cube(vec3(1., 1., 1.), (true, false, false));

        assert_eq!(obj.get_code(), "translate([-0.5,0,0])\n{\n\tcube([1,1,1]);\n}");
    }
    #[test]
    fn cube_center_yz()
    {
        let obj = centered_cube(vec3(1., 2., 4.), (false, true, true));

        assert_eq!(obj.get_code(), "translate([0,-1,-2])\n{\n\tcube([1,2,4]);\n}");
    }

    #[test]
    fn square_center()
    {
        let obj = centered_square(vec2(2., 4.), (true, true));

        assert_eq!(obj.get_code(), "translate([-1,-2])\n{\n\tsquare([2,4]);\n}");
    }

    #[test]
    fn cylinder_center()
    {
        let obj = centered_cylinder(10., CircleType::Radius(5.));

        assert_eq!(obj.get_code(), "translate([0,0,-5])\n{\n\tcylinder(h=10,r=5);\n}");
    }
}