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use crate::entity::borrow::Reborrow;
use crate::entity::Lifetime;

pub type Data<M> = <M as Parametric>::Data;

/// Graph data.
///
/// Specifies the types used to represent data in vertices, arcs, edges, and
/// faces in a [`MeshGraph`]. Arbitrary types can be used, including the unit
/// type `()` for no data at all.
///
/// Geometric operations depend on understanding the positional data in vertices
/// exposed by the [`AsPosition`] trait. If the `Vertex` type implements
/// [`AsPosition`], then geometric operations supported by the `Position` type
/// are exposed by graph APIs.
///
/// # Examples
///
/// ```rust
/// # extern crate decorum;
/// # extern crate nalgebra;
/// # extern crate num;
/// # extern crate plexus;
/// #
/// use decorum::R64;
/// use nalgebra::{Point3, Vector4};
/// use num::Zero;
/// use plexus::geometry::{AsPosition, IntoGeometry};
/// use plexus::graph::{GraphData, MeshGraph};
/// use plexus::prelude::*;
/// use plexus::primitive::generate::Position;
/// use plexus::primitive::sphere::UvSphere;
///
/// #[derive(Clone, Copy, Eq, Hash, PartialEq)]
/// pub struct Vertex {
///     pub position: Point3<R64>,
///     pub color: Vector4<R64>,
/// }
///
/// impl GraphData for Vertex {
///     type Vertex = Self;
///     type Arc = ();
///     type Edge = ();
///     type Face = ();
/// }
///
/// impl AsPosition for Vertex {
///     type Position = Point3<R64>;
///
///     fn as_position(&self) -> &Self::Position {
///         &self.position
///     }
/// }
///
/// // Create a mesh from a uv-sphere.
/// let mut graph: MeshGraph<Vertex> = UvSphere::new(8, 8)
///     .polygons::<Position<Point3<R64>>>()
///     .map_vertices(|position| Vertex {
///         position,
///         color: Zero::zero(),
///     })
///     .collect();
/// ```
///
/// [`AsPosition`]: crate::geometry::AsPosition
/// [`MeshGraph`]: crate::graph::MeshGraph
pub trait GraphData: Lifetime + Sized {
    type Vertex: Clone + Lifetime;
    type Arc: Clone + Default + Lifetime;
    type Edge: Clone + Default + Lifetime;
    type Face: Clone + Default + Lifetime;
}

impl GraphData for () {
    type Vertex = ();
    type Arc = ();
    type Edge = ();
    type Face = ();
}

impl<T> GraphData for (T, T)
where
    T: Clone + Lifetime,
{
    type Vertex = Self;
    type Arc = ();
    type Edge = ();
    type Face = ();
}

impl<T> GraphData for (T, T, T)
where
    T: Clone + Lifetime,
{
    type Vertex = Self;
    type Arc = ();
    type Edge = ();
    type Face = ();
}

impl<T> GraphData for [T; 2]
where
    T: Clone + Lifetime,
{
    type Vertex = Self;
    type Arc = ();
    type Edge = ();
    type Face = ();
}

impl<T> GraphData for [T; 3]
where
    T: Clone + Lifetime,
{
    type Vertex = Self;
    type Arc = ();
    type Edge = ();
    type Face = ();
}

pub trait Parametric {
    type Data: GraphData;
}

impl<B> Parametric for B
where
    B: Reborrow,
    B::Target: Parametric,
{
    type Data = <B::Target as Parametric>::Data;
}