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use renderer::CreationProxy;
use glin::{self, SimpleVao};
use traits::ToSimpleVao;
use util::{Error, Result};
use math::one;
use graphics::{Node, NodeT, node};

pub struct Builder{
    pub(crate) gl: CreationProxy,
}

impl Builder{
    pub fn from_mesh<T, U, G>(&self, mesh: &G) -> Result<Object<SimpleVao<T>>>
        where G: ToSimpleVao<T,U>,
    {
        let vao = mesh.to_simple_vao(&self.gl, &::default_attribute_bindings(), glin::gl::STATIC_DRAW)
            .map_err(|err| Error::with_cause("Error creating vao from mesh", err))?;
        Ok(Object{
            geom: vao,
            node: one(),
        })
    }
}

pub struct Object<G>{
    geom: G,
    node: Node,
}

impl<G> Object<G>{
    pub fn new(geom: G) -> Object<G> {
        Object{
            geom,
            node: one(),
        }
    }

    pub fn geometry(&self) -> &G{
        &self.geom
    }
}

impl<G> NodeT for Object<G>{
    fn node(&self) -> &Node {
        &self.node
    }

    fn node_mut(&mut self) -> &mut Node {
        &mut self.node
    }

    fn update_with_parent_flags(&mut self, parent: Option<&Node>, flags: node::Flags) -> bool{
        self.node.update_with_parent_flags(parent, flags)
    }
}