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use crate::nodes::{
    MergedFrameSubmitNodes, RenderFeatureIndex, RenderJobBeginExecuteGraphContext,
    RenderJobWriteContext, RenderPhase, RenderPhaseIndex, RenderRegistry, RenderView, SubmitNodeId,
};
use rafx_api::RafxResult;

pub trait FeatureCommandWriter {
    fn on_begin_execute_graph(
        &self,
        _write_context: &mut RenderJobBeginExecuteGraphContext,
    ) -> RafxResult<()> {
        Ok(())
    }
    fn apply_setup(
        &self,
        _write_context: &mut RenderJobWriteContext,
        _view: &RenderView,
        _render_phase_index: RenderPhaseIndex,
    ) -> RafxResult<()> {
        Ok(())
    }
    fn render_element(
        &self,
        write_context: &mut RenderJobWriteContext,
        view: &RenderView,
        render_phase_index: RenderPhaseIndex,
        index: SubmitNodeId,
    ) -> RafxResult<()>;
    fn revert_setup(
        &self,
        _write_context: &mut RenderJobWriteContext,
        _view: &RenderView,
        _render_phase_index: RenderPhaseIndex,
    ) -> RafxResult<()> {
        Ok(())
    }

    fn feature_debug_name(&self) -> &'static str;
    fn feature_index(&self) -> RenderFeatureIndex;
}

// pub struct FeatureCommandWriterSet {
//     prepare_jobs: Vec<Box<dyn FeatureCommandWriter>>,
// }

pub struct PreparedRenderData {
    feature_writers: Vec<Option<Box<dyn FeatureCommandWriter>>>,
    submit_nodes: MergedFrameSubmitNodes,
}

impl PreparedRenderData {
    pub fn empty() -> Self {
        PreparedRenderData {
            feature_writers: Default::default(),
            submit_nodes: MergedFrameSubmitNodes::empty(),
        }
    }

    pub fn new(
        feature_writers: Vec<Box<dyn FeatureCommandWriter>>,
        submit_nodes: MergedFrameSubmitNodes,
    ) -> Self {
        let mut writers: Vec<_> = (0..RenderRegistry::registered_feature_count())
            .map(|_| None)
            .collect();

        for writer in feature_writers {
            let feature_index = writer.feature_index();
            writers[feature_index as usize] = Some(writer);
        }

        PreparedRenderData {
            feature_writers: writers,
            submit_nodes,
        }
    }

    pub fn on_begin_execute_graph(
        &self,
        write_context: &mut RenderJobBeginExecuteGraphContext,
    ) -> RafxResult<()> {
        for writer in &self.feature_writers {
            if let Some(writer) = writer {
                writer.on_begin_execute_graph(write_context)?;
            }
        }

        Ok(())
    }

    pub fn write_view_phase<PhaseT: RenderPhase>(
        &self,
        view: &RenderView,
        write_context: &mut RenderJobWriteContext,
    ) -> RafxResult<()> {
        let submit_nodes = self.submit_nodes.submit_nodes::<PhaseT>(view);
        let render_phase_index = PhaseT::render_phase_index();

        let mut previous_node_feature_index: i32 = -1;
        for submit_node in submit_nodes {
            if submit_node.feature_index() as i32 != previous_node_feature_index {
                if previous_node_feature_index != -1 {
                    // call revert setup
                    log::trace!("revert setup for feature {}", previous_node_feature_index);
                    self.feature_writers[previous_node_feature_index as usize]
                        .as_ref()
                        .unwrap()
                        .revert_setup(write_context, view, render_phase_index)?;
                }

                // call apply setup
                log::trace!("apply setup for feature {}", submit_node.feature_index());
                self.feature_writers[submit_node.feature_index() as usize]
                    .as_ref()
                    .unwrap()
                    .apply_setup(write_context, view, render_phase_index)?;

                previous_node_feature_index = submit_node.feature_index() as i32;
            }

            log::trace!(
                "draw render node feature: {} node id: {}",
                submit_node.feature_index(),
                submit_node.submit_node_id(),
            );

            //TODO: This could be a single call providing a range
            self.feature_writers[submit_node.feature_index() as usize]
                .as_ref()
                .unwrap()
                .render_element(
                    write_context,
                    view,
                    render_phase_index,
                    submit_node.submit_node_id(),
                )?;
        }

        if previous_node_feature_index != -1 {
            // call revert setup
            log::trace!("revert setup for feature: {}", previous_node_feature_index);
            self.feature_writers[previous_node_feature_index as usize]
                .as_ref()
                .unwrap()
                .revert_setup(write_context, view, render_phase_index)?;
        }

        Ok(())
    }
}