#!/usr/bin/env sh

set -o errexit
set -o nounset

PREFERENCES="/var/lib/plex/Plex Media Server/Preferences.xml"
TEMPLATE_PREFERENCES="/etc/plex/Preferences.xml"

getPref() {
  xmlstarlet sel -t -v "/Preferences/@$1" "$PREFERENCES" 2>/dev/null || true
}

setPref() {
  name="$1"
  value="$2"

  xmlstarlet ed --inplace \
    -d "/Preferences/@${name}" \
    -i "/Preferences" -t attr -n "${name}" -v "${value}" \
    "$PREFERENCES"
}

mkdir -p "$(dirname "$PREFERENCES")"
if [ ! -f "$PREFERENCES" ]; then
  echo '<?xml version="1.0" encoding="utf-8"?><Preferences/>' > "$PREFERENCES"
fi

if [ -f "$TEMPLATE_PREFERENCES" ]; then
  ATTRS="$(xmlstarlet sel -t -m "/Preferences/@*" -v "concat(name(),'=',.)" -n "$TEMPLATE_PREFERENCES")"

  if [ -n "$ATTRS" ]; then
    set --

    while IFS='=' read -r name value; do
      [ -z "$name" ] && continue
      set -- "$@" -d "/Preferences/@${name}"
      set -- "$@" -i "/Preferences" -t attr -n "${name}" -v "${value}"
    done <<EOF
$ATTRS
EOF

    if [ "$#" -gt 0 ]; then
      xmlstarlet ed --inplace "$@" "$PREFERENCES"
    fi
  fi
fi

rm -f "/var/lib/plex/Plex Media Server/plexmediaserver.pid"
plexmediaserver &
PID="$!"

trap 'kill -QUIT "$PID"' INT TERM
wait "$PID"
exit $?