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use std::collections::BTreeSet;

use crate::{
    objects::{Face, Shell},
    storage::Handle,
};

/// A 3-dimensional shape, built from [`Shell`]s. Many Solids will contains only
/// one shell, but if the Solid contains cavities they will be represented by a
/// shell each, as well as a shell for the outside.
///
/// # Implementation Note
///
/// The shells that form the boundaries of the solid must not intersect. This is
/// not currently validated.
#[derive(Clone, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
pub struct Solid {
    shells: BTreeSet<Handle<Shell>>,
}

impl Solid {
    /// Construct an empty instance of `Solid`
    pub fn new(shells: impl IntoIterator<Item = Handle<Shell>>) -> Self {
        Self {
            shells: shells.into_iter().collect(),
        }
    }

    /// Access the solid's shells
    pub fn shells(&self) -> impl Iterator<Item = &Handle<Shell>> {
        self.shells.iter()
    }

    /// Find the given face in the solid
    pub fn find_face(&self, face: &Handle<Face>) -> Option<Handle<Face>> {
        for shell in self.shells() {
            if let Some(face) = shell.find_face(face) {
                return Some(face);
            }
        }

        None
    }
}