// Copyright 2022 RisingWave Labs
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::sync::Arc;

use risingwave_common::bail;
use risingwave_pb::expr::expr_node::Type::{
    GreaterThan, GreaterThanOrEqual, LessThan, LessThanOrEqual,
};
use risingwave_pb::stream_plan::DynamicFilterNode;

use super::*;
use crate::common::table::state_table::StateTableBuilder;
use crate::executor::DynamicFilterExecutor;

pub struct DynamicFilterExecutorBuilder;

impl ExecutorBuilder for DynamicFilterExecutorBuilder {
    type Node = DynamicFilterNode;

    async fn new_boxed_executor(
        params: ExecutorParams,
        node: &Self::Node,
        store: impl StateStore,
    ) -> StreamResult<Executor> {
        let [source_l, source_r]: [_; 2] = params.input.try_into().unwrap();
        let key_l = node.get_left_key() as usize;

        let vnodes = params.vnode_bitmap.map(Arc::new);

        let prost_condition = node.get_condition()?;
        let comparator = prost_condition.get_function_type()?;
        if !matches!(
            comparator,
            GreaterThan | GreaterThanOrEqual | LessThan | LessThanOrEqual
        ) {
            bail!(
                "`DynamicFilterExecutor` only supports comparators:\
                GreaterThan | GreaterThanOrEqual | LessThan | LessThanOrEqual",
            );
        }

        let state_table_r = StateTableBuilder::new(node.get_right_table()?, store.clone(), None)
            .enable_preload_all_rows_by_config(&params.config)
            .build()
            .await;

        let left_table = node.get_left_table()?;
        let cleaned_by_watermark = node.cleaned_by_watermark
            || #[expect(deprecated)]
            left_table.cleaned_by_watermark;
        let state_table_l = StateTableBuilder::new(node.get_left_table()?, store, vnodes)
            .enable_preload_all_rows_by_config(&params.config)
            .build()
            .await;

        let exec = DynamicFilterExecutor::new(
            params.actor_context,
            params.eval_error_report,
            params.info.schema.clone(),
            source_l,
            source_r,
            key_l,
            comparator,
            state_table_l,
            state_table_r,
            params.executor_stats,
            params.config.developer.chunk_size,
            cleaned_by_watermark,
        )
        .boxed();

        Ok((params.info, exec).into())
    }
}
