#!/bin/sh

# patterns
DEVICEEUI=ABBAABBAABBAABBA
APPEUI=ACCAACCAACCAACCA
APPKEY=ADDAADDAADDAADDAADDAADDAADDAADDA

if [ $# -ne 2 ]; then
  echo "gen_images <master_binary> <devices_file>\n"
  echo "devices file must be in the form :\n"
  echo "dev1name:dev1eui:dev1appeui:dev1appkey"
  echo "dev2name:dev2eui:dev2appeui:dev2appkey\n"
  exit 1;
fi

SED=sed
MASTER=$1
DEVICES=$2

if [[ $OSTYPE == "darwin"* ]]; then
  if ! command -v gsed > /dev/null 2>&1; then
    echo "You need gnu-sed on darwin system (available with homebrew)"
    exit 1
  fi
  SED=gsed
fi

if [ ! -e $MASTER ]; then
  echo "The master file $MASTER doesn't exists"
  exit 1;
fi

if [ ! -e $DEVICES ]; then
  echo "The devices file $DEVICES doesn't exists"
  exit 1;
fi

for DEVICE in $(cat $DEVICES); do
  name=$(echo $DEVICE | cut -d : -f 1)
  deviceeui=$(echo $DEVICE | cut -d : -f 2)
  appeui=$(echo $DEVICE | cut -d : -f 3)
  appkey=$(echo $DEVICE | cut -d : -f 4)
  echo "Generating device $name ($deviceeui)"
  hexdump -ve '1/1 "%.2X"' $MASTER | $SED "s/${DEVICEEUI}/${deviceeui}/; s/${APPEUI}/${appeui}/; s/${APPKEY}/${appkey}/" | xxd -r -p - ${deviceeui}.bin
done

exit;