package main

import (
	"context"
	"errors"
	"fmt"
	"io"
	"net"
	"os"
	"os/signal"
	"syscall"
	"time"

	sdkvsock "github.com/firecracker-microvm/firecracker-go-sdk/vsock"
	"github.com/sirupsen/logrus"

	"banger/internal/vsockping"
)

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

	logger := logrus.New()
	logger.SetOutput(io.Discard)
	listener, err := sdkvsock.Listener(ctx, logrus.NewEntry(logger), vsockping.Port)
	if err != nil {
		fmt.Fprintf(os.Stderr, "banger-vsock-pingd: %v\n", err)
		os.Exit(1)
	}
	defer listener.Close()

	for {
		conn, err := listener.Accept()
		if err != nil {
			if ctx.Err() != nil || errors.Is(err, net.ErrClosed) {
				return
			}
			fmt.Fprintf(os.Stderr, "banger-vsock-pingd: accept: %v\n", err)
			time.Sleep(200 * time.Millisecond)
			continue
		}
		go func(conn net.Conn) {
			if err := vsockping.ServeConn(conn); err != nil {
				fmt.Fprintf(os.Stderr, "banger-vsock-pingd: %v\n", err)
			}
		}(conn)
	}
}