#!/usr/bin/env bash

(( EUID != 0 )) && echo "Error: installation only works as root!" >&2 && exit 1

API_ENDPOINT="https://git.ccc-rheintal.ch/api/v1/repos/spacefreak/pbc"

WORK_DIR=''
function cleanup_work_dir() {
  [ -n "$WORK_DIR" ] && [ -d "$WORK_DIR" ] && rm -r "$WORK_DIR"
  trap - EXIT
}

function download_files() {
  local path rc
  local query_params=''
  [ -n "$GIT_TAG" ] && query_params="?ref=$GIT_TAG"

  while (( $# > 0 )); do
    path=$1
    shift
    curl -fsSL --output-dir "$WORK_DIR/" --remote-name "$API_ENDPOINT/raw/$path$query_params"
    rc=$?
    if (( rc != 0 )); then
      return $rc
    fi
  done
}

GIT_TAG=$(curl -fsSL "$API_ENDPOINT/tags" | grep -o '{"name":"[^"]*"' | sed 's/^{"name":"//;s/"$//' | grep -E '^v[0-9]+' | sort --version-sort | tail -n 1)
if [ -n "$GIT_TAG" ]; then
  echo "Info: installing pbc version $GIT_TAG"
else
  echo "Warning: no Git tag found, installing from repository default branch" >&2
fi

WORK_DIR=$(mktemp -d)
trap cleanup_work_dir EXIT

! download_files config.example pbc && echo "Error downloading files!" >&2 && exit 10
chmod +x "$WORK_DIR/pbc"
chmod o= "$WORK_DIR/config.example"

"$WORK_DIR/pbc" install
rc=$?
if (( rc != 0 )); then
  echo "Error installing pbc requirements!" >&2
  exit $rc
fi

! install -m 0755 -o root -g root "$WORK_DIR/pbc" /usr/local/bin/pbc && echo 'Error installing file!' >&2 && exit 20

echo "Success!"