//! Draw a 3 dimensional heart using solid
//!
//! >>> cargo run --example heart
//!
//! Writes an .stl file to target/stl/heart.stl

use crater::{
    csg::{
        algebra::CSGAlgebra,
        marching_cubes::{marching_cubes, MarchingCubesParams},
        surfaces::{parse_surface, IntoSurface, Surface3D},
        transformations::{ScaleDim, Translate},
    },
    utils::Parallel,
};

fn main() {
    // Two cones intersecting at their bases
    // with two spheres on top of the cones
    let heart = -parse_surface("x^2 + (-y + (x^2)^(1/3))^2 - 50")
        .unwrap()
        .transform(ScaleDim(0, 0.2))
        .transform(ScaleDim(1, 0.2))
        .transform(ScaleDim(2, 0.2));

    let z0 = --Surface3D::Plane {
        normal: [0.0, 0.0, 1.0],
    }
    .into_surface();
    let z1 = -Surface3D::Plane {
        normal: [0.0, 0.0, 1.0],
    }
    .into_surface()
    .transform(Translate([0.0, 0.0, 1.0]));

    // let csg = c1 | c2;
    let csg = heart & z0 & z1;
    let resolution = 50;
    let params = MarchingCubesParams {
        region: csg,
        bounds: ([-3.0, -3.0, -3.0], [3.0, 3.0, 3.0]),
        resolution: (resolution, resolution, resolution),
        algebra: CSGAlgebra::default(),
    };
    let mesh = marching_cubes::<Parallel>(params);
    let mut path_buf = std::path::PathBuf::from("./target/stl/");
    path_buf.push("heart");
    path_buf.set_extension("stl");
    std::fs::create_dir_all(&path_buf.parent().expect("Failed to get parent directory"))
        .expect("Failed to create directory");
    mesh.write_stl(path_buf.to_str().unwrap())
        .expect("Failed to write csg.stl");
}