package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"time"

	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
)

func main() {
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
	defer stop()

	shutdown, err := setupTracing(ctx)
	if err != nil {
		log.Fatal(err)
	}
	defer func() {
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		if err := shutdown(shutdownCtx); err != nil {
			log.Printf("trace shutdown failed: %v", err)
		}
	}()

	mux := http.NewServeMux()
	mux.HandleFunc("/hello", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprintln(w, "hello from checkout-api")
	})

	handler := otelhttp.NewHandler(mux, "checkout-api")
	server := &http.Server{
		Addr:              ":8080",
		Handler:           handler,
		ReadHeaderTimeout: 5 * time.Second,
	}

	go func() {
		log.Println("listening on :8080")
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Printf("server stopped: %v", err)
		}
	}()

	<-ctx.Done()

	shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	_ = server.Shutdown(shutdownCtx)
}