#!/bin/bash
# Add ' -x' above to debug
#
# Start an EDDN Service, including redirecting output to a log file.

EXIT_CONFIG_MISSING=1
EXIT_SERVICE_BIN_MISSING=2
EXIT_CL_ARGS=3
EXIT_SERVICE_ALREADY_RUNNING=4

usage() {
  echo "Usage: $(basename $0) ( live | beta | dev ) ( gateway | monitor | relay ) [ --from-source [ --background ] ]"
}

if [ -z "${1}" ];
then
  usage
  echo "No EDDN environment specified."
  exit ${EXIT_CL_ARGS}
fi
EDDN_ENV="${1}"

if [ -z "${2}" ];
then
  usage
  echo "No EDDN service specified."
  exit ${EXIT_CL_ARGS}
fi
SERVICE="${2}"

if [ ! -z "${3}" ];
then
  if [ "${3}" != "--from-source" ];
  then
    usage
    echo "Un-recognised argument: ${3}"
    exit ${EXIT_CL_ARGS}
  fi
  FROM_SOURCE="1"
  if [ ! -z "${4}" ];
  then
    if [ "${4}" != "--background" ];
    then
      usage
      echo "Un-recognised argument: ${4}"
    fi
    BACKGROUND=1
  fi
fi

EXEC_PATH=$(dirname $0)
#echo "EXEC_PATH: ${EXEC_PATH}"

# Ensure we're in the correct place
cd ${EXEC_PATH}
#pwd

# Bring in some common configuration
if [ ! -f "eddn_${EDDN_ENV}_config" ];
then
  echo "eddn_${EDDN_ENV}_config is missing from $(pwd)"
  exit ${EXIT_CONFIG_MISSING}
fi
. "./eddn_${EDDN_ENV}_config"

# Use the python venv
. "${PYTHON_VENV}/bin/activate"

# Running from source or install ?
if [ -z "${FROM_SOURCE}" ];
then
  # From install
  if [ ! -f "${PYTHON_VENV}/bin/eddn-${SERVICE}" ];
  then
    echo "${SERVICE} is missing from ${PYTHON_VENV}/bin"
    exit ${EXIT_SERVICE_BIN_MISSING}
  fi
  
  if ps -C python $(cat "${LOG_DIR}/${SERVICE}.pid") > /dev/null 2>&1;
  then
    echo "${SERVICE}: already running as PID $(cat "${LOG_DIR}/${SERVICE}.pid")"
    exit ${EXIT_SERVICE_ALREADY_RUNNING}
  fi

  ${PYTHON_VENV}/bin/eddn-${SERVICE} --config "${CONFIG_OVERRIDE}" >> "${LOG_DIR}/${SERVICE}.log" 2>&1 &
  echo $! > "${LOG_DIR}/${SERVICE}.pid"
  wait $(cat "${LOG_DIR}/${SERVICE}.pid")
else
  # From source
  cd "${SRC_DIR}/src/eddn"
  #pwd
  # For now the source file has Camel case.
  #echo ${SERVICE}
  SERVICE_CAMEL=$(echo ${SERVICE} | sed -s 's/^\(.\)/\u\1/;')
  #echo ${SERVICE_CAMEL}
  if [ -z "${BACKGROUND}" ];
  then
    echo "Starting ${SERVICE_CAMEL} in foreground..."
    ${PYTHON_VENV}/bin/python ${SERVICE_CAMEL}.py --config "${CONFIG_OVERRIDE}"
  else
    # We need to ensure there isn't already one, via the .pid file
    if [ -f "${LOG_DIR}/${SERVICE}.pid" ];
    then
      if ps -C python $(cat "${LOG_DIR}/${SERVICE}.pid") > /dev/null 2>&1;
      then
        echo "${SERVICE}: already running as PID $(cat "${LOG_DIR}/${SERVICE}.pid")"
        exit ${EXIT_SERVICE_ALREADY_RUNNING}
      fi
    fi

    echo "Starting ${SERVICE_CAMEL} in background..."
    ${PYTHON_VENV}/bin/python ${SERVICE_CAMEL}.py --config "${CONFIG_OVERRIDE}" >> "${LOG_DIR}/${SERVICE}.log" 2>&1 &
    PID=$!
    echo ${PID} > "${LOG_DIR}/${SERVICE}.pid"
    echo "${SERVICE_CAMEL}.py started with PID: ${PID}"
  fi
fi


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