// Licensed to the Apache Software Foundation (ASF) 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 pprof

import (
	"context"
	"errors"
	"runtime/pprof"

	"github.com/apache/skywalking-go/plugins/core/operator"
	"github.com/apache/skywalking-go/plugins/core/profile"
	"github.com/apache/skywalking-go/plugins/core/tracing"
)

type SetLabelsInterceptor struct{}

func (h *SetLabelsInterceptor) BeforeInvoke(invocation operator.Invocation) error {
	c := invocation.Args()[0].(context.Context)
	if tracing.ActiveSpan() == nil {
		return nil
	}
	if !tracing.ActiveSpan().IsProfileTarget() {
		return nil
	}
	now := profile.CatchNowProfileLabel()
	l, ok := now.(pprof.LabelSet)
	if !ok {
		return errors.New("profile label transform error")
	}
	c = pprof.WithLabels(c, l)
	invocation.ChangeArg(0, c)
	return nil
}

func (h *SetLabelsInterceptor) AfterInvoke(invocation operator.Invocation, result ...interface{}) error {
	return nil
}
