// Copyright 2023 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 risingwave_expr::aggregate::AggCall;
use risingwave_pb::stream_plan::SimpleAggNode;

use super::*;
use crate::executor::aggregate::StatelessSimpleAggExecutor;

pub struct StatelessSimpleAggExecutorBuilder;

impl ExecutorBuilder for StatelessSimpleAggExecutorBuilder {
    type Node = SimpleAggNode;

    async fn new_boxed_executor(
        params: ExecutorParams,
        node: &Self::Node,
        _store: impl StateStore,
    ) -> StreamResult<Executor> {
        let [input]: [_; 1] = params.input.try_into().unwrap();
        let agg_calls: Vec<AggCall> = node
            .get_agg_calls()
            .iter()
            .map(AggCall::from_protobuf)
            .try_collect()?;

        let exec = StatelessSimpleAggExecutor::new(
            params.actor_context,
            input,
            params.info.schema.clone(),
            agg_calls,
        )?;
        Ok((params.info, exec).into())
    }
}
