package streamingutil

import (
	"os"

	"github.com/milvus-io/milvus/internal/util/sessionutil"
)

const MilvusStreamingServiceEnabled = "MILVUS_STREAMING_SERVICE_ENABLED"

// IsStreamingServiceEnabled returns whether the streaming service is enabled.
func IsStreamingServiceEnabled() bool {
	// TODO: check if the environment variable MILVUS_STREAMING_SERVICE_ENABLED is set
	return os.Getenv(MilvusStreamingServiceEnabled) == "1"
}

// SetStreamingServiceEnabled set the env that indicates whether the streaming service is enabled.
func SetStreamingServiceEnabled() {
	err := os.Setenv(MilvusStreamingServiceEnabled, "1")
	if err != nil {
		panic(err)
	}
}

// MustEnableStreamingService panics if the streaming service is not enabled.
func MustEnableStreamingService() {
	if !IsStreamingServiceEnabled() {
		panic("start a streaming node without enabling streaming service, please set environment variable MILVUS_STREAMING_SERVICE_ENABLED = 1")
	}
}

// EnableEmbededQueryNode set server labels for embedded query node.
func EnableEmbededQueryNode() {
	MustEnableStreamingService()
	os.Setenv(sessionutil.SupportedLabelPrefix+sessionutil.LabelStreamingNodeEmbeddedQueryNode, "1")
}

// IsEmbeddedQueryNode returns whether the current node is an embedded query node in streaming node.
func IsEmbeddedQueryNode() bool {
	return os.Getenv(sessionutil.SupportedLabelPrefix+sessionutil.LabelStreamingNodeEmbeddedQueryNode) == "1"
}