#!/bin/bash
#
# Author  : Gaston Gonzalez
# Date    : 16 July 2026
# Updated : 26 August 2026
# Purpose : Wrapper script for starting Mercury with PnP support
#
# Preconditions:
# 1. Supported radio and audio interface are connected and properly detected
#
# Postconditions:
# 1. Mercury started with sane defaults

ET_MERCURY_HOME="${HOME}/.local/share/emcomm-tools/mercury"
ET_MERCURY_LOG="${ET_MERCURY_HOME}/session.log"

usage() {
  echo "usage: $(basename $0) <mode>"
  echo "  <mode>"
  echo "    arq       - Automatic Retry Request mode (Winlink)"
  echo "    broadcast - Broadcast mode (Reticulum)"
  echo "    custom    - User defined mode for custom settings"
}

if [[ $# -ne 1 ]]; then
  et-log "Can't started Mercury modem. Mode not specified."
  usage
  exit 1
fi

MODE="$1"

case "${MODE}" in
  arq)
    ET_MERCURY_INI="${ET_MERCURY_HOME}/mercury.arq.ini"
    OPTS=""
  ;;
  broadcast)
    ET_MERCURY_INI="${ET_MERCURY_HOME}/mercury.broadcast.ini"
    OPTS="-m 0 -b 8100"
  ;;
  custom)
    ET_MERCURY_INI="${ET_MERCURY_HOME}/mercury.custom.ini"
    OPTS=""
  ;;
  *)
    et-log "Can't started Mercury modem. Mode not supported."
    usage
    exit 1
  ;;
esac

if [[ ! -e ${ET_MERCURY_HOME} ]]; then
  et-log "ET_MERCURY_HOME does not exist at ${ET_MERCURY_HOME}. Exiting"
  exit 1
fi

if [[ ! -e ${ET_MERCURY_INI} ]]; then
  et-log "Mercury configuration file not found  at ${ET_MERCURY_INI}. Exiting"
  exit 1
fi

start() {
  update_config

  if [[ $? -eq 0 ]]; then

    systemctl is-active --quiet rigctld
    if [[ $? -ne 0 ]]; then
      et-log "Can't start Mercury. rigctld not running. Ensure radio is selected."
      exit 1
    fi
  
    ALSA_DEVICE=$(et-system-info et-audio-card) 

    CMD="mercury -C ${ET_MERCURY_INI} -L ${ET_MERCURY_LOG} -i plughw:${ALSA_DEVICE} -o plughw:${ALSA_DEVICE} ${OPTS}"

    et-log "Starting Mercury in mode ${MODE} with: '${CMD}'"
    echo
    ${CMD}
  else 
    et-log "Error configurating modem. Can't start Mercury"
    exit 1
  fi
}

update_config () {

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

  # 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."
       exit 1
     fi
  else
    et-log "No ET_AUDIO device plugged in."
    exit 1
  fi
}

start