#!/bin/bash
#
# Author  : Gaston Gonzalez
# Date    : 30 June 2026
# Purpose : Wrapper script for starting modem73 with PnP support
#
# Preconditions:
# 1. Supported radio and audio interface are connected and properly detected
#
# Postconditions:
# 1. modem73 started with sane defaults

MODEM73_CONF_FILE="${HOME}/.config/modem73/settings"

usage() {
  echo "usage: $(basename $0) <command> <type>"
  echo "  <command>"
  echo "    start              - Start modem73 in selected mode"
  echo "    update-config      - Update configuration for selected mode"
  echo ""
  echo "  <type>"
  echo "    default            - QPSK, normal frames, 1/2 code rate (recommended)"
}

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

MODE=$2
case "${MODE}" in
  default)
    et-log "Configuration updates not yet implemented."
  ;;
  *)
    et-log "Can't started modem73. Mode '${MODE}' not supported"
    usage
    exit 1
  ;;
esac

notify_user() {
  notify-send \
   -t 10000 \
   --app-name="EmComm Tools" \
   "$1"
}

[ -z ${ET_LOG_DIR} ] && ET_LOG_DIR="${HOME}/.local/share/emcomm-tools"
[ ! -e ${ET_LOG_DIR} ] && mkdir -p ${ET_LOG_DIR}

start() {
  update_config
  
  if [ $? -eq 0 ]; then

    systemctl is-active --quiet rigctld
    if [ $? -ne 0 ]; then
      et-log "Can't start modem73. rigctld not running. Ensure radio is selected."
      notify_user "Can't start modem73. rigctld not running."
      exit 1
    fi
  
    ALSA_DEVICE=$(et-system-info et-audio-card) 
    INPUT_AUDIO=$(modem73 --list-audio | grep input | grep $ALSA_DEVICE | cut -d":" -f3)
    OUTPUT_AUDIO=$(modem73 --list-audio | grep output| grep $ALSA_DEVICE | cut -d":" -f3)

    CMD="modem73 --input-device ${INPUT_AUDIO} --output-device ${OUTPUT_AUDIO} --ptt rigctl --headless"
    et-log "Starting modem73 with: '${CMD}'"
    echo
    ${CMD}
  else 
    et-log "Error updating configuration. Can't start modem73"
    exit 1
  fi
}

update_config () {

    # The modem73 configuration file causes issues when using it in combination with
    # command line arguments during manual runs. It is best to remove it before each
    # run and drive the modem using only command line arguments.
    if [[ -e "${MODEM73_CONF_FILE}" ]]; then
      et-log "Removing previous configuration file: ${MODEM73_CONF_FILE}"
      rm -v ${MODEM73_CONF_FILE}
    fi

    et-log "Attempting to start modem73 in mode: '${MODE}'"

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

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

    # 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

         # 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 modem73. No ET_AUDIO device detected."
         exit 1
       fi
    else
      et-log "No ET_AUDIO device plugged in."
      notify_user "Can't start modem73. 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