package util

import (
	"github.com/milvus-io/milvus/pkg/v3/proto/streamingpb"
	"github.com/milvus-io/milvus/pkg/v3/streaming/util/message"
	"github.com/milvus-io/milvus/pkg/v3/util/paramtable"
	"github.com/milvus-io/milvus/pkg/v3/util/replicateutil"
)

func IsReplicationRemovedByAlterReplicateConfigMessage(msg message.ImmutableMessage, replicateInfo *streamingpb.ReplicatePChannelMeta) (replicationRemoved bool) {
	prcMsg := message.MustAsImmutableAlterReplicateConfigMessageV2(msg)
	header := prcMsg.Header()

	// Check ignore field - if true, this message should be ignored
	// This is used for incomplete switchover messages that should be ignored after force promote
	if header.Ignore {
		return false
	}

	replicateConfig := header.ReplicateConfiguration
	currentClusterID := paramtable.Get().CommonCfg.ClusterPrefix.GetValue()
	currentCluster := replicateutil.MustNewConfigHelper(currentClusterID, replicateConfig).GetCurrentCluster()
	_, err := currentCluster.GetTargetChannel(replicateInfo.GetSourceChannelName(),
		replicateInfo.GetTargetCluster().GetClusterId())
	if err != nil {
		// Cannot find the target channel, it means that the `current->target` topology edge is removed,
		// it means that the replication is removed.
		return true
	}
	return false
}