#!/bin/bash
#
# Author  : Gaston Gonzalez
# Date    : 16 July 2026
# Updated : 17 July 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
#
# Notes:
#
# Mercury supports many modulation types and configuration options. To
# keep usage simple, only three modulation settings have been configured
# that map to a combination of reliability and speed for most general
# purpose applications.
#
# The DATAC17 and QAM16C2 modes are documented on the RETICULUM.md
# documenation on the mercury GitHub project, but are not yet supported
# in version 1.9.9. Disabling these options from now.


usage() {
  echo "usage: $(basename $0) <mode>"
  echo "  <mode>"
  echo "    reliability - Max reliability (Slower Speed) [DATAC1]"
  echo "    balanced    - Balanced (Reliability and Speed) [DATAC17]"
  echo "    fast        - Fast (Low Reliability) [QAM16C2]"
}

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

MODE="$1"

case "${MODE}" in
  reliability)
    MODE_INDEX="0"
  ;;
  balanced)
    MODE_INDEX="9"
    et-log "Mode not yet supported."
    exit 1
  ;;
  fast)
    MODE_INDEX="10"
    et-log "Mode not yet supported."
    exit 1
  ;;
  *)
    et-log "Can't started Mercury modem. Mode not supported."
    usage
    exit 1
  ;;
esac

[[ -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 Mercury. rigctld not running. Ensure radio is selected."
      exit 1
    fi
  
    ALSA_DEVICE=$(et-system-info et-audio-card) 

    # Mercury implemented support for rigctld oddly. Even though the rigctld IP and port are
    # specified with the -A option, the code will not trigger the PTT unless a rig model
    # is specified. We can specify model '2' (network mode) with the -R option to ensure that
    # the PTT conditional code blocks for hamlib are called. This explains why earlier tests
    # only worked with the DigiRig Lite as it has an internal VOX circuit.
    CMD="mercury -m ${MODE_INDEX} -i plughw:${ALSA_DEVICE} -o plughw:${ALSA_DEVICE} -A 127.0.0.1:4532 -R 2"

    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