#!/command/with-contenv bashio
# shellcheck shell=bash
export LOG_FD
# ==============================================================================
# Home Assistant Community App: Netmaker
# Joins the netmaker network once, using an enrollment token
# ==============================================================================
declare token
declare -a options=()
declare value
declare wait_counter=0

readonly NODES_FILE="/etc/netclient/nodes.json"
readonly WAIT_DELAY=2
readonly WAIT_COUNT=30  # 30*2s = 60s

# An enrollment token is required for a headless join. The token is a base64
# blob that already embeds the netmaker server address, so nothing else is
# needed to reach the server.
token=$(bashio::config 'enrollment_token')
if bashio::var.is_empty "${token}"; then
  bashio::exit.nok \
    "No 'enrollment_token' configured. Generate one in your Netmaker dashboard" \
    "(Enrollment Keys) and set it in this app's configuration."
fi

# If this host is already registered to a network, don't join again. The daemon
# keeps nodes.json populated; a non-empty object means we have joined before.
if bashio::fs.file_exists "${NODES_FILE}" \
  && jq --exit-status 'length > 0' "${NODES_FILE}" > /dev/null 2>&1; then
  bashio::log.info "netclient is already joined to a network, skipping join"
  exit 0
fi

# Build the optional join flags from configuration.
if value=$(bashio::config 'host_name') && bashio::var.has_value "${value}"; then
  options+=(-o "${value}")
fi
if bashio::config.has_value 'port' && [[ "$(bashio::config 'port')" -ne 0 ]]; then
  options+=(-p "$(bashio::config 'port')")
fi
if value=$(bashio::config 'interface') && bashio::var.has_value "${value}"; then
  options+=(-I "${value}")
fi
if value=$(bashio::config 'endpoint') && bashio::var.has_value "${value}"; then
  options+=(-e "${value}")
fi
if value=$(bashio::config 'endpoint6') && bashio::var.has_value "${value}"; then
  options+=(-E "${value}")
fi
if value=$(bashio::config 'firewall') && bashio::var.has_value "${value}"; then
  options+=(-f "${value}")
fi

# Give the daemon a moment to initialize its config directory before joining.
while [ ! -d /etc/netclient ]; do
  if (( wait_counter++ == WAIT_COUNT )); then
    break
  fi
  sleep "${WAIT_DELAY}"
done

bashio::log.info "Joining netmaker network..."
if ! /opt/netclient join -t "${token}" "${options[@]}"; then
  bashio::exit.nok "Failed to join the netmaker network"
fi

bashio::log.info "Successfully joined the netmaker network"