package peer

import (
	"fmt"
	"log"
	"runtime/debug"
)

func (peer *Peer) ifReader() {
	defer func() {
		if r := recover(); r != nil {
			fmt.Println("stacktrace from panic: \n" + string(debug.Stack()))
		}
	}()

	var (
		sender = newConnSender(peer.conn, peer.ip, STREAM_DATA, peer.signPrivKey)
		n      int
		destIP byte
		router = peer.router
		route  *route
		iface  = peer.iface
		err    error
		packet = make([]byte, BUFFER_SIZE)
	)

	for {
		n, err = iface.Read(packet[:BUFFER_SIZE])
		if err != nil {
			log.Fatalf("Failed to read from interface: %v", err)
		}

		if n < 20 {
			log.Printf("Dropping small packet: %d", n)
			continue
		}

		packet = packet[:n]

		destIP = packet[19]

		route = router.GetRoute(destIP)
		if route == nil || !route.Up {
			log.Printf("Dropping packet for non-existent IP: %d", destIP)
			continue
		}

		sender.send(PACKET_TYPE_DATA, packet, route)
	}
}