#! /bin/bash
#
# Update all modules that use a particular variables.tf to a new tag.
#
# Must be run from the `xdr-terraform-modules` directory, with a copy
# of `xdr-terraform-live` at the same directory level.

# "Strict Mode"
set -euo pipefail
IFS=$'\n\t'

function argparse {
  PARAMS=""
  DEBUG=0
  while (( "$#" )); do
    case "$1" in
      -h|--help)
        echo Usage: $0 '[-t|--test] [-d|--debug] VARIABLEFILE NEWTAG'
        exit 0
        ;;
#      -t|--test)
#        TESTING="/bin/echo TESTING: "
#        shift
#        ;;
      -d|--debug)
        >&2 echo debug: Enabling debugging..
        DEBUG=1
        shift
        ;;
      -*|--*=) # unsupported flags
        echo "Error: Unsupported flag $1" >&2
        exit 1
        ;;
      *) # preserve positional arguments
        PARAMS="$PARAMS $1"
        shift
        ;;
    esac
  done
  # set positional arguments in their proper place
  eval set -- "$PARAMS"

  if [[ $# != 2 ]]; then
    echo "Incorrect number of parameters."
    echo Usage: $0 '[-t|--test] [-d|--debug] VARIABLEFILE NEWTAG'
    exit 4
  fi

  VARIABLEFILE=$1
  NEWTAG=$2
}

argparse $*

# Ensure we're in teh proper directory
PWD=`pwd`
BN=`basename $PWD`
if [[ $BN != "xdr-terraform-modules" ]]; then
  echo Must be run from xdr-terraform-modules root.
  exit 1
fi

if [[ ! -d ../xdr-terraform-live ]]; then
  echo Directory \"../xdr-terraform-live\" not found.
  exit 5
fi

if [[ ! -f "variables/${VARIABLEFILE}" ]]; then
  echo Variable file \"variables/${VARIABLEFILE}\" does not exist.
  exit 2
fi

if [[ ! ${NEWTAG} =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
  echo Tag \"${NEWTAG}\" does not appear to be in teh proper format.
  exit 3
fi

# Gather a list of all terragrunt.hcl files in xdr-terraform live. Should be faster to do this one.
echo Finding all modules in xdr-terraform-live.. This may take a moment.
LIVEMODULES=$( find ../xdr-terraform-live -name "terragrunt.hcl" -type f -depth -mindepth 2 -not -path "*/.terragrunt-cache/*" -not -path "*/000-skeleton/*" )
echo $( echo -n "${LIVEMODULES}" | wc -l ) modules found in xdr-terraform-live.

# Gather the modules that use it
MODULES=$( find base -type l -name ${VARIABLEFILE} | sed "s#/${VARIABLEFILE}\$##" )
set +e
for m in ${MODULES}; do
  echo ==== ${VARIABLEFILE} used in module $m
  for l in ${LIVEMODULES}; do
    if [[ ${DEBUG} > 0 ]]; then
      echo ======== Searching for string \"$m\" in \"$l\"
    fi

    grep --silent ${m} ${l}
    RES=$?
    if [[ ${RES} == 0 ]]; then
      echo ============ $m FOUND in $l
      sed -E -i .bak 's/ref=v[0-9]+.[0-9]+\.[0-9]+"$/ref='${NEWTAG}'"/' $l
    fi
  done
done
set -e