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mod camera_2d;
mod main_transparent_pass_2d_node;

pub mod graph {
    use bevy_render::render_graph::{RenderLabel, RenderSubGraph};

    #[derive(Debug, Hash, PartialEq, Eq, Clone, RenderSubGraph)]
    pub struct Core2d;

    pub mod input {
        pub const VIEW_ENTITY: &str = "view_entity";
    }

    #[derive(Debug, Hash, PartialEq, Eq, Clone, RenderLabel)]
    pub enum Node2d {
        MsaaWriteback,
        StartMainPass,
        MainTransparentPass,
        EndMainPass,
        Bloom,
        Tonemapping,
        Fxaa,
        Smaa,
        Upscaling,
        ContrastAdaptiveSharpening,
        EndMainPassPostProcessing,
    }
}

use std::ops::Range;

pub use camera_2d::*;
pub use main_transparent_pass_2d_node::*;

use bevy_app::{App, Plugin};
use bevy_ecs::{entity::EntityHashSet, prelude::*};
use bevy_math::FloatOrd;
use bevy_render::{
    camera::Camera,
    extract_component::ExtractComponentPlugin,
    render_graph::{EmptyNode, RenderGraphApp, ViewNodeRunner},
    render_phase::{
        sort_phase_system, CachedRenderPipelinePhaseItem, DrawFunctionId, DrawFunctions, PhaseItem,
        PhaseItemExtraIndex, SortedPhaseItem, ViewSortedRenderPhases,
    },
    render_resource::CachedRenderPipelineId,
    Extract, ExtractSchedule, Render, RenderApp, RenderSet,
};

use crate::{tonemapping::TonemappingNode, upscaling::UpscalingNode};

use self::graph::{Core2d, Node2d};

pub struct Core2dPlugin;

impl Plugin for Core2dPlugin {
    fn build(&self, app: &mut App) {
        app.register_type::<Camera2d>()
            .add_plugins(ExtractComponentPlugin::<Camera2d>::default());

        let Some(render_app) = app.get_sub_app_mut(RenderApp) else {
            return;
        };
        render_app
            .init_resource::<DrawFunctions<Transparent2d>>()
            .init_resource::<ViewSortedRenderPhases<Transparent2d>>()
            .add_systems(ExtractSchedule, extract_core_2d_camera_phases)
            .add_systems(
                Render,
                sort_phase_system::<Transparent2d>.in_set(RenderSet::PhaseSort),
            );

        render_app
            .add_render_sub_graph(Core2d)
            .add_render_graph_node::<EmptyNode>(Core2d, Node2d::StartMainPass)
            .add_render_graph_node::<ViewNodeRunner<MainTransparentPass2dNode>>(
                Core2d,
                Node2d::MainTransparentPass,
            )
            .add_render_graph_node::<EmptyNode>(Core2d, Node2d::EndMainPass)
            .add_render_graph_node::<ViewNodeRunner<TonemappingNode>>(Core2d, Node2d::Tonemapping)
            .add_render_graph_node::<EmptyNode>(Core2d, Node2d::EndMainPassPostProcessing)
            .add_render_graph_node::<ViewNodeRunner<UpscalingNode>>(Core2d, Node2d::Upscaling)
            .add_render_graph_edges(
                Core2d,
                (
                    Node2d::StartMainPass,
                    Node2d::MainTransparentPass,
                    Node2d::EndMainPass,
                    Node2d::Tonemapping,
                    Node2d::EndMainPassPostProcessing,
                    Node2d::Upscaling,
                ),
            );
    }
}

pub struct Transparent2d {
    pub sort_key: FloatOrd,
    pub entity: Entity,
    pub pipeline: CachedRenderPipelineId,
    pub draw_function: DrawFunctionId,
    pub batch_range: Range<u32>,
    pub extra_index: PhaseItemExtraIndex,
}

impl PhaseItem for Transparent2d {
    #[inline]
    fn entity(&self) -> Entity {
        self.entity
    }

    #[inline]
    fn draw_function(&self) -> DrawFunctionId {
        self.draw_function
    }

    #[inline]
    fn batch_range(&self) -> &Range<u32> {
        &self.batch_range
    }

    #[inline]
    fn batch_range_mut(&mut self) -> &mut Range<u32> {
        &mut self.batch_range
    }

    #[inline]
    fn extra_index(&self) -> PhaseItemExtraIndex {
        self.extra_index
    }

    #[inline]
    fn batch_range_and_extra_index_mut(&mut self) -> (&mut Range<u32>, &mut PhaseItemExtraIndex) {
        (&mut self.batch_range, &mut self.extra_index)
    }
}

impl SortedPhaseItem for Transparent2d {
    type SortKey = FloatOrd;

    #[inline]
    fn sort_key(&self) -> Self::SortKey {
        self.sort_key
    }

    #[inline]
    fn sort(items: &mut [Self]) {
        // radsort is a stable radix sort that performed better than `slice::sort_by_key` or `slice::sort_unstable_by_key`.
        radsort::sort_by_key(items, |item| item.sort_key().0);
    }
}

impl CachedRenderPipelinePhaseItem for Transparent2d {
    #[inline]
    fn cached_pipeline(&self) -> CachedRenderPipelineId {
        self.pipeline
    }
}

pub fn extract_core_2d_camera_phases(
    mut commands: Commands,
    mut transparent_2d_phases: ResMut<ViewSortedRenderPhases<Transparent2d>>,
    cameras_2d: Extract<Query<(Entity, &Camera), With<Camera2d>>>,
    mut live_entities: Local<EntityHashSet>,
) {
    live_entities.clear();

    for (entity, camera) in &cameras_2d {
        if !camera.is_active {
            continue;
        }

        commands.get_or_spawn(entity);
        transparent_2d_phases.insert_or_clear(entity);

        live_entities.insert(entity);
    }

    // Clear out all dead views.
    transparent_2d_phases.retain(|camera_entity, _| live_entities.contains(camera_entity));
}