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use std::ops::Deref;

use crate::render::{
    graph::{Node, NodeRunError, RenderContext, RenderGraphContext, SlotInfo},
    render_commands::DrawDebugOutlines,
    render_phase::RenderCommand,
    resource::TrackedRenderPass,
    Eventually::Initialized,
    RenderState,
};

/// Pass which renders debug information on top of the map.
pub struct DebugPassNode {}

impl DebugPassNode {
    pub fn new() -> Self {
        Self {}
    }
}

impl Node for DebugPassNode {
    fn input(&self) -> Vec<SlotInfo> {
        vec![]
    }

    fn update(&mut self, _state: &mut RenderState) {}

    fn run(
        &self,
        _graph: &mut RenderGraphContext,
        render_context: &mut RenderContext,
        state: &RenderState,
    ) -> Result<(), NodeRunError> {
        let Initialized(render_target) = &state.render_target else {
            return Ok(());
        };

        let color_attachment = wgpu::RenderPassColorAttachment {
            view: render_target.deref(),
            ops: wgpu::Operations {
                // Draws on-top of previously rendered data
                load: wgpu::LoadOp::Load,
                store: true,
            },
            resolve_target: None,
        };

        let render_pass =
            render_context
                .command_encoder
                .begin_render_pass(&wgpu::RenderPassDescriptor {
                    label: None,
                    color_attachments: &[Some(color_attachment)],
                    depth_stencil_attachment: None,
                });

        let mut tracked_pass = TrackedRenderPass::new(render_pass);

        for item in &state.mask_phase.items {
            DrawDebugOutlines::render(state, item, &mut tracked_pass);
        }

        Ok(())
    }
}