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use crate::*;

impl<P> PolylineCurve<P> {
    /// meshing the curve
    pub fn from_curve<C>(curve: &C, range: (f64, f64), tol: f64) -> Self
    where C: ParameterDivision1D<Point = P> {
        PolylineCurve(curve.parameter_division(range, tol).1)
    }
}

impl StructuredMesh {
    /// meshing the surface
    /// # Arguments
    /// * `bspsurface` - bspline surface to meshed
    /// * `tol` - standard tolerance for meshing
    pub fn from_surface<S>(
        surface: &S,
        range: ((f64, f64), (f64, f64)),
        tol: f64,
    ) -> StructuredMesh
    where
        S: ParametricSurface3D + ParameterDivision2D,
    {
        let (div0, div1) = surface.parameter_division(range, tol);
        create_mesh(surface, div0, div1)
    }
}

fn create_mesh<S>(surface: &S, div0: Vec<f64>, div1: Vec<f64>) -> StructuredMesh
where S: ParametricSurface3D {
    let mut positions = vec![Vec::with_capacity(div1.len()); div0.len()];
    let mut normals = vec![Vec::with_capacity(div1.len()); div0.len()];
    div0.iter()
        .zip(positions.iter_mut().zip(normals.iter_mut()))
        .for_each(|(u, (prow, nrow))| {
            div1.iter().for_each(move |v| {
                prow.push(surface.subs(*u, *v));
                nrow.push(surface.normal(*u, *v));
            })
        });
    StructuredMesh {
        positions,
        uv_division: Some((div0, div1)),
        normals: Some(normals),
    }
}