#!/bin/bash
#
# Author  : Gaston Gonzalez
# Date    : 5 December 2024
# Updated : 6 December 2024
# Purpose : Wrapper script for starting chattervox with PnP support
#
# Preconditions:
# 1. Supported radio and audio interface are connected and properly detected
# 2. Dire Wolf is started
#
# Postconditions:
# 1. On first start, configuration is created and signing key is generated.
# 2. chattervox is started in chat mode

CHATTERVOX_CONF_DIR=${HOME}/.chattervox
CHATTERVOX_CONF_FILE=${CHATTERVOX_CONF_DIR}/config.json
CHATTERVOX_KEYSTORE_FILE=${CHATTERVOX_CONF_DIR}/keystore.json

usage() {
  echo "usage: $(basename $0) <command>"
  echo "  <command>"
  echo "    start           - Start chat"
  echo "    update-config   - Update configuration for selected mode"
}

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

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

generate_config() {

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

cat <<EOF > "${CHATTERVOX_CONF_FILE}"
{
  "version": 3,
  "callsign": "${CALLSIGN}",
  "ssid": 0,
  "keystoreFile": "${HOME}/.chattervox/keystore.json",
  "kissPort": "kiss://localhost:8001",
  "kissBaud": 9600,
  "feedbackDebounce": 20000
}
EOF

  # Generate keystore file if it does not exist
  if [ ! -e ${CHATTERVOX_KEYSTORE_FILE} ]; then
    chattervox genkey
  fi

  # Grab existing or newly generated signing key if available
  SIGNING_KEY=$(cat ${CHATTERVOX_KEYSTORE_FILE} | jq -e -r .${CALLSIGN}[0].public)
  if [ $? -ne 0 ]; then
    et-log "Generating signing key for ${CALLSIGN}..."
    chattervox genkey
    SIGNING_KEY=$(cat ${CHATTERVOX_KEYSTORE_FILE} | jq -e -r .${CALLSIGN}[0].public)
  else
    et-log "Signing key already exits for ${CALLSIGN}."
  fi
  

cat <<EOF > "${CHATTERVOX_CONF_FILE}"
{
  "version": 3,
  "callsign": "${CALLSIGN}",
  "ssid": 0,
  "keystoreFile": "${HOME}/.chattervox/keystore.json",
  "kissPort": "kiss://localhost:8001",
  "kissBaud": 9600,
  "feedbackDebounce": 20000,
  "signingKey": "${SIGNING_KEY}"
}
EOF
}

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

    RIGCTLD_OUT=$(ps -ef | grep [d]irewolf)
    if [ $? -ne 0 ]; then
      et-log "Can't start chattervox. Dire Wolf not running."
      notify_user "Can't start chattervox. Dire Wolf not running."
      exit 1
    fi

    CWD_DIR=$(pwd)

    CMD="chattervox chat"
    et-log "Starting chattervox with: ${CMD}"

    ${CMD}

  else 
    et-log "Error updating configuration. Can't start chattervox"
    exit 1
  fi
}

update-config () {

    [ -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 chattervox. No callsign set. Run: et-user."
      exit 1
    fi
 
    [ ! -e ${CHATTERVOX_CONF_DIR} ] && mkdir ${CHATTERVOX_CONF_DIR}

    if [ ! -e ${CHATTERVOX_CONF_FILE} ]; then
      et-log "chattervox configuration does not exist creating: ${CHATTERVOX_CONF_FILE}..."
      generate_config

    else
      et-log "Chattervox configuration already exists, checking for change in et-user..."

      CUR_CALLSIGN=$(cat ${ET_USER_CONFIG} | jq -r .callsign)
      CONFIGURED_CALLSIGN=$(cat ${CHATTERVOX_CONF_FILE} | jq -r .callsign)
      
      if [ "${CUR_CALLSIGN}" != "${CONFIGURED_CALLSIGN}" ]; then
        et-log "User callsign has changed from ${CUR_CALLSIGN} to ${CONFIGURED_CALLSIGN}"
        generate_config
      fi
     
    fi
}

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