// Copyright © 2025 Hardcore Engineering Inc.
//
// Licensed under the Eclipse Public 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 https://www.eclipse.org/legal/epl-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  provides all-in configured pprof server for debugging purposes
package pprof

import (
	"context"
	"net/http"
	"net/http/pprof"
	"time"

	"github.com/hcengineering/stream/internal/pkg/log"
	"go.uber.org/zap"
)

// ListenAndServe - configures pprof http handlers
func ListenAndServe(ctx context.Context, listenOn string) {
	log.FromContext(ctx).Debug("Profiler is enabled", zap.String("listening on", listenOn))
	mux := http.NewServeMux()
	mux.HandleFunc("/debug/pprof/", pprof.Index)
	mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
	mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
	mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
	mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
	mux.Handle("/debug/pprof/allocs", pprof.Handler("allocs"))
	mux.Handle("/debug/pprof/block", pprof.Handler("block"))
	mux.Handle("/debug/pprof/goroutine", pprof.Handler("goroutine"))
	mux.Handle("/debug/pprof/heap", pprof.Handler("heap"))
	mux.Handle("/debug/pprof/mutex", pprof.Handler("mutex"))
	mux.Handle("/debug/pprof/threadcreate", pprof.Handler("threadcreate"))
	server := &http.Server{
		Addr:         listenOn,
		Handler:      mux,
		ReadTimeout:  10 * time.Second,
		WriteTimeout: 10 * time.Second,
	}
	if err := server.ListenAndServe(); err != nil {
		log.FromContext(ctx).Debug("Failed to start profiler", zap.Error(err))
	}
	<-ctx.Done()
	_ = server.Close()
}