#!/bin/bash -eu
set -o pipefail

usage() {
  cat <<EOF
  Usage: $(basename $0) NAME

  replaces the owner's name in $OWNER_FILE

EOF
}

main() {
  initialize-environment-vars $@ || { usage; exit 1; }
  backup-and-save-name
  report-success
}

initialize-environment-vars() {
  readonly OWNER_FILE=/home/app/.wiki/$DOMAIN.owner.json
  readonly OWNER_BACKUP_FILE=$OWNER_FILE-saved-$(date --iso-8601=minutes)
  readonly NAME=${@:-missing}
  [ ! "$NAME" == "missing" ]
}

backup-and-save-name() {
  mv $OWNER_FILE $OWNER_BACKUP_FILE
  jq ".name = \"$NAME\"" $OWNER_BACKUP_FILE > $OWNER_FILE
}

report-success() {
  cat <<EOF
  Owner's name changed to "$NAME"
  Previous config is saved in ${OWNER_BACKUP_FILE##$PWD/}

EOF
}

main "$@"