// Copyright 2025 PingCAP, Inc.
//
// 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.

// Package domainadaptor provides a way to access the embedFn inside Domain without
// actually importing the domain package. This is useful to avoid circular dependencies.
package domainadaptor

import (
	"github.com/pingcap/tidb/pkg/domain/domainctx"
	"github.com/pingcap/tidb/pkg/inference"
	"github.com/pingcap/tidb/pkg/sessionctx"
)

type domainProxy interface {
	GetEmbedFn() *inference.EmbedFn
}

// GetEmbedFn returns the embed function bridge in the domain. It is roughly a global singleton.
// (but with domain lifecycle management to avoid goroutine leaks in tests)
func GetEmbedFn(sctx sessionctx.Context) *inference.EmbedFn {
	return domainctx.GetDomain(sctx).(domainProxy).GetEmbedFn()
}