package main

import "os"
import "io"
import "fmt"
import "log"
import "net"
import "time"
import "errors"
// import "context"
import "git.tebibyte.media/sashakoshka/hopp"
import "git.tebibyte.media/sashakoshka/hopp/examples/ping"

func main() {
	name := os.Args[0]
	if len(os.Args) != 2 {
		fmt.Fprintf(os.Stderr, "Usage: %s HOST:PORT\n", name)
		os.Exit(2)
	}
	address := os.Args[1]
	
	conn, err := dial(address)
	handleErr(1, err)
	trans, err := conn.OpenTrans()
	handleErr(1, err)

	go func() {
		defer fmt.Fprintf(os.Stdout, "(i) disconnected\n")
		for {
			message, _, err := ping.Receive(trans)
			if err != nil {
				if !errors.Is(err, io.EOF) {
					handleErr(1, err)
				}
				break
			}
			switch message := message.(type) {
			case *ping.MessagePong:
				log.Printf("--> pong (%d) from %v", message, address)
			}
		}
	}()

	message := ping.MessagePing(0)
	for {
		log.Printf("<-- ping (%d)", message)
		_, err := ping.Send(trans, &message)
		handleErr(1, err)
		message ++
		time.Sleep(time.Second)
	}
}

func dial(address string) (hopp.Conn, error) {
	// ctx, done := context.WithTimeout(context.Background(), 16 * time.Second)
	// defer done()
	// conn, err := hopp.Dial(ctx, "tcp", address, nil)
	// if err != nil { return nil, err }
	// return conn, nil
	underlying, err := net.Dial("tcp", address)
	if err != nil { return nil, err }
	conn := hopp.AdaptA(underlying, hopp.ServerSide)
	return conn, nil
}

func handleErr(code int, err error) {
	if err != nil {
		fmt.Fprintf(os.Stderr, "%s: %v\n", os.Args[0], err)
		os.Exit(code)
	}
}