/*
Copyright (C) 2022-2025 ApeCloud Co., Ltd

This file is part of KubeBlocks project

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package metrics

import (
	"net/http"
	"regexp"

	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/collectors"
	"github.com/prometheus/client_golang/prometheus/promhttp"

	"github.com/apecloud/kubeblocks/pkg/controllerutil"
)

const metricsPath = "/metrics/runtime"

func RuntimeMetric() map[string]http.Handler {
	if !controllerutil.EnabledRuntimeMetrics() {
		return nil
	}

	reg := prometheus.NewRegistry()
	reg.MustRegister(collectors.NewBuildInfoCollector())
	reg.MustRegister(collectors.NewGoCollector(
		collectors.WithGoCollectorRuntimeMetrics(
			collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")}),
	))

	return map[string]http.Handler{
		metricsPath: promhttp.HandlerFor(
			reg,
			promhttp.HandlerOpts{
				EnableOpenMetrics: true,
			},
		),
	}
}
