scion 0.6.0

Game making library on top of wgpu, winit, legion
Documentation 
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use std::{collections::HashMap, marker::PhantomData};

use legion::storage::Component;

use crate::core::components::{material::Material, tiles::tileset::Tileset};

/// `AssetManager` is resource that will link assets to an asset ref to allow reusability of assets
#[derive(Default)]
pub struct AssetManager {
    materials: HashMap<usize, Material>,
}

impl AssetManager {
    pub(crate) fn get_material_for_ref(&self, asset_ref: &AssetRef<Material>) -> Material {
        self.materials
            .get(&asset_ref.0)
            .expect("An asset has been requested but does not exist")
            .clone()
    }

    pub fn register_material(&mut self, material: Material) -> AssetRef<Material> {
        let next_ref = AssetRef(self.materials.keys().count(), PhantomData::default());
        self.materials.insert(next_ref.0, material);
        next_ref
    }

    pub fn register_tileset(&mut self, tileset: Tileset) -> AssetRef<Material> {
        let next_ref = AssetRef(self.materials.keys().count(), PhantomData::default());
        self.materials.insert(next_ref.0, Material::Tileset(tileset));
        next_ref
    }

    pub fn retrieve_tileset(&self, asset_ref: &AssetRef<Material>) -> Option<&Tileset> {
        match self.materials.get(&asset_ref.0) {
            None => None,
            Some(material) => match material {
                Material::Tileset(tileset) => Some(tileset),
                _ => None,
            },
        }
    }
}

#[derive(Clone)]
pub struct AssetRef<T>(pub(crate) usize, PhantomData<T>)
where
    T: Component;

#[cfg(test)]
mod tests {
    use crate::core::{
        components::{color::Color, material::Material, tiles::tileset::Tileset},
        resources::asset_manager::AssetManager,
    };
    
    

    #[test]
    fn register_material_test() {
        let mut manager = AssetManager::default();
        let asset_ref = manager.register_material(Material::Color(Color::new(1, 1, 1, 1.)));
        assert_eq!(0, asset_ref.0);
        assert_eq!(1, manager.materials.len());

        let asset_ref = manager.register_material(Material::Color(Color::new(2, 2, 2, 1.)));
        assert_eq!(1, asset_ref.0);
        assert_eq!(2, manager.materials.len());
    }

    #[test]
    fn register_tileset_test() {
        let mut manager = AssetManager::default();
        let asset_ref = manager.register_tileset(Tileset::new("test".to_string(), 1, 1, 1));
        assert_eq!(0, asset_ref.0);
        assert_eq!(1, manager.materials.len());
    }
}