package util

import (
	"github.com/google/gopacket"
	"github.com/google/gopacket/layers"
	"github.com/google/gopacket/pcapgo"
	log "github.com/sirupsen/logrus"
	"io/ioutil"
	"os"
	"strconv"
)

// WritePcap writes the provided data to a given pcap file
func WritePcap(file string, data []byte, ci gopacket.CaptureInfo) {
	f, err := os.Create(file)
	if err != nil {
		log.Errorf("Error writing pcap file %s", file)
	}
	defer f.Close()

	r, err := pcapgo.NewNgWriter(f, layers.LinkTypeEthernet)
	if err != nil {
		log.Errorf("Error writing pcap file %s", file)
	}
	defer r.Flush()

	err = r.WritePacket(ci, data)
}

// WriteBinary writes the provided data to a given binary file
func WriteBinary(file string, data []byte) {
	if err := ioutil.WriteFile(file, data, 0644); err != nil {
		log.Errorf("Error writing binary file %s", file)
	}
}

func WritePIDFile(filename string) {
	if filename == "" {
		return
	}
	if err := ioutil.WriteFile(filename, []byte(strconv.Itoa(os.Getpid())), 0644); err != nil {
		log.Errorf("Error writing PID file %s", filename)
	}
}