mod forward_pipeline;
mod lights_node;

pub use forward_pipeline::*;
pub use lights_node::*;

/// the names of pbr graph nodes
pub mod node {
    pub const TRANSFORM: &str = "transform";
    pub const STANDARD_MATERIAL: &str = "standard_material";
    pub const LIGHTS: &str = "lights";
}

/// the names of pbr uniforms
pub mod uniform {
    pub const LIGHTS: &str = "Lights";
}

use crate::prelude::StandardMaterial;
use bevy_asset::Assets;
use bevy_ecs::Resources;
use bevy_render::{
    pipeline::PipelineDescriptor,
    render_graph::{base, AssetRenderResourcesNode, RenderGraph, RenderResourcesNode},
    shader::Shader,
};
use bevy_transform::prelude::GlobalTransform;

pub(crate) fn add_pbr_graph(graph: &mut RenderGraph, resources: &Resources) {
    graph.add_system_node(
        node::TRANSFORM,
        RenderResourcesNode::<GlobalTransform>::new(true),
    );
    graph.add_system_node(
        node::STANDARD_MATERIAL,
        AssetRenderResourcesNode::<StandardMaterial>::new(true),
    );
    graph.add_system_node(node::LIGHTS, LightsNode::new(10));
    let mut shaders = resources.get_mut::<Assets<Shader>>().unwrap();
    let mut pipelines = resources.get_mut::<Assets<PipelineDescriptor>>().unwrap();
    pipelines.set(
        FORWARD_PIPELINE_HANDLE,
        build_forward_pipeline(&mut shaders),
    );

    // TODO: replace these with "autowire" groups
    graph
        .add_node_edge(node::STANDARD_MATERIAL, base::node::MAIN_PASS)
        .unwrap();
    graph
        .add_node_edge(node::TRANSFORM, base::node::MAIN_PASS)
        .unwrap();
    graph
        .add_node_edge(node::LIGHTS, base::node::MAIN_PASS)
        .unwrap();
}