#!/bin/bash
#
# Author  : Gaston Gonzalez
# Date    : 1 November 2024
# Purpose : Wrapper script for starting Dire Wolf with PnP support
#
# Preconditions:
# 1. Supported radio and audio interface are connected and properly detected
#
# Postconditions:
# 1. Audio settings updated
# 2. Dire Wolf started

DIREWOLF_CONF_FILE=${ET_HOME}/conf/template.d/packet/direwolf.conf

usage() {
  echo "usage: $(basename $0) <command> <type>"
  echo "  <command>"
  echo "    start           - Start Dire Wolf in selected mode"
  echo "    update-config   - Update configuration for selected mode"
  echo ""
  echo "  <type>"
  echo "    digipeater-only - Run in RF-only digipeater mode"
  echo "    simple-packet   - Run in simple packet mode"
}

if [ $# -ne 2 ]; then
  usage
  exit 1
fi

MODE=$2
case "${MODE}" in
  digipeater-only)
    DIREWOLF_TEMPLATE_CONF_FILE="${ET_HOME}/conf/template.d/packet/direwolf.${MODE}.conf"
  ;;
  simple-packet)
    DIREWOLF_TEMPLATE_CONF_FILE="${ET_HOME}/conf/template.d/packet/direwolf.${MODE}.conf"
  ;;
  *)
    et-log "Can't started Dire Wolf. Mode '${MODE}' not supported"
    usage
    exit 1
  ;;
esac

notify_user() {
  notify-send \
   -t 5000 \
   --app-name="EmComm Tools" \
   "$1"
}

start() {
  update-config
  
  if [ $? -eq 0 ]; then
    CMD="direwolf -c ${DIREWOLF_CONF_FILE} -t 0 -p"
    et-log "Starting Dire Wolf with: '${CMD}'"
    echo
    ${CMD}
  else 
    et-log "Error updating configuration. Can't start Dire Wolf"
    exit 1
  fi
}

update-config () {

    et-log "Attempting to start Dire Wolf in mode: '${MODE}'"

    [ -z "$ET_USER_CONFIG" ] && ET_USER_CONFIG="${HOME}/.config/emcomm-tools/user.json"

    CALLSIGN=$(cat ${ET_USER_CONFIG} | jq -r .callsign)

    if [ "${CALLSIGN}" = "N0CALL" ]; then
      notify_user "Can't start Dire Worlf. No callsign set. Run: et-user."
      exit 1
    fi

    # 1. Check if the symlink was created by the udev rules
    if [ -e /dev/et-audio ]; then

       # 2. Check that this device was properly tagged with the ET_AUDIO env variable with a udev rule
       APLAY_OUT=$(arecord -l | grep ET_AUDIO)
       if [ $? -eq 0 ]; then
         AUDIO_CARD=$(echo $APLAY_OUT | cut -d":" -f1 | awk '{print $2}')
         AUDIO_DEVICE=$(echo $APLAY_OUT | cut -d"," -f2 | cut -d":" -f1 | awk '{print $2}')
         DIREWOLF_AUDIO_DEVICE="plughw:${AUDIO_CARD},${AUDIO_DEVICE}"

         et-log "Creating '${DIREWOLF_CONF_FILE}' from template '${DIREWOLF_TEMPLATE_CONF_FILE}'"
         cp ${DIREWOLF_TEMPLATE_CONF_FILE} ${DIREWOLF_CONF_FILE}

         # 3. Update callsign
         sed -i "s|{{ET_CALLSIGN}}|${CALLSIGN}|g" ${DIREWOLF_CONF_FILE} 

         # 4. Update audio device
         et-log "Using '${DIREWOLF_AUDIO_DEVICE}' as audio device for Dire Wolf configuration."
         sed -i "s|{{ET_AUDIO_DEVICE}}|${DIREWOLF_AUDIO_DEVICE}|g" ${DIREWOLF_CONF_FILE} 

         echo "Generated the configuration below..."
         echo
         cat ${DIREWOLF_CONF_FILE}
         echo

         # Configure ALSA settings for sound card
         /opt/emcomm-tools/bin/et-audio update-config

       else
         et-log "No ET_AUDIO device detected."
         notify_user "Can't start Dire Wolf. No ET_AUDIO device detected."
         exit 1
       fi
    else
      et-log "No ET_AUDIO device plugged in."
      notify_user "Can't start Dire Wolf. No supported audio device plugged in."
      exit 1
    fi

}

case $1 in
  start)
    start
    ;;
  update-config)
    update-config
    ;;
  *)
    echo "Invalid command."
    usage
    exit 1
  ;;
esac