// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.

package segments

import (
	"context"
	"fmt"

	"github.com/apache/arrow/go/v17/arrow"

	"github.com/milvus-io/milvus/internal/querynodev2/segments/state"
	"github.com/milvus-io/milvus/internal/util/segcore"
	"github.com/milvus-io/milvus/pkg/v3/proto/planpb"
	"github.com/milvus-io/milvus/pkg/v3/util/merr"
)

func ComputeScorerScoresOnChunkedOffsets(
	ctx context.Context,
	segment Segment,
	searchReq *segcore.SearchRequest,
	scorer *planpb.ScoreFunction,
	offsets *arrow.Chunked,
) (*arrow.Chunked, error) {
	return computeScorerScoresOnChunkedOffsets(ctx, segment, searchReq, scorer, offsets, false)
}

func AsyncComputeScorerScoresOnChunkedOffsets(
	ctx context.Context,
	segment Segment,
	searchReq *segcore.SearchRequest,
	scorer *planpb.ScoreFunction,
	offsets *arrow.Chunked,
) (*arrow.Chunked, error) {
	return computeScorerScoresOnChunkedOffsets(ctx, segment, searchReq, scorer, offsets, true)
}

func computeScorerScoresOnChunkedOffsets(
	ctx context.Context,
	segment Segment,
	searchReq *segcore.SearchRequest,
	scorer *planpb.ScoreFunction,
	offsets *arrow.Chunked,
	async bool,
) (*arrow.Chunked, error) {
	if segment == nil {
		return nil, merr.WrapErrServiceInternal("segment is nil")
	}

	local, ok := segment.(*LocalSegment)
	if !ok {
		return nil, merr.WrapErrServiceInternal(fmt.Sprintf("segment %d does not support boost score", segment.ID()))
	}
	if local.csegment == nil {
		return nil, merr.WrapErrServiceInternal(fmt.Sprintf("segment %d has nil CSegment", segment.ID()))
	}
	if !local.ptrLock.PinIf(state.IsNotReleased) {
		return nil, merr.WrapErrSegmentNotLoaded(segment.ID(), "segment released")
	}
	defer local.ptrLock.Unpin()

	if async {
		return segcore.AsyncComputeScorerScoresOnChunkedOffsets(ctx, local.csegment, searchReq, scorer, offsets)
	}
	return segcore.ComputeScorerScoresOnChunkedOffsets(local.csegment, searchReq, scorer, offsets)
}