#!/bin/bash

### Constants
encoding="ansiutf8"

### Functions
err() {
  echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $*" >&2
}

helpFunc() {
  echo "::: Show the qrcode of a client for use with the mobile app"
  echo ":::"
  echo -n "::: Usage: pivpn <-qr|qrcode> [-h|--help] [Options] "
  echo "[<client-1> ... [<client-2>] ...]"
  echo ":::"
  echo "::: Options:"
  echo ":::  -a256|ansi256        Shows QR Code in ansi256 characters"
  echo "::: Commands:"
  echo ":::  [none]               Interactive mode"
  echo ":::  <client>             Client(s) to show"
  echo ":::  -h,--help            Show this help dialog"
}

### Script
# Parse input arguments

while [[ "$#" -gt 0 ]]; do
  _key="${1}"

  case "${_key}" in
    -h | --help)
      helpFunc
      exit 0
      ;;
    -a256 | --ansi256)
      encoding="ansi256"
      ;;
    *)
      CLIENTS_TO_SHOW+=("${1}")
      ;;
  esac

  shift
done

cd /etc/wireguard/configs || exit

if [[ ! -s clients.txt ]]; then
  err "::: There are no clients to show"
  exit 1
fi

mapfile -t LIST < <(awk '{print $1}' clients.txt)

if [[ "${#CLIENTS_TO_SHOW[@]}" -eq 0 ]]; then
  echo -e "::\e[4m  Client list  \e[0m::"
  len="${#LIST[@]}"
  COUNTER=1

  while [[ "${COUNTER}" -le "${len}" ]]; do
    printf "%0${#len}s) %s\r\n" "${COUNTER}" "${LIST[(($COUNTER - 1))]}"
    ((COUNTER++))
  done

  echo -n "Please enter the Index/Name of the Client to show: "
  read -r CLIENTS_TO_SHOW

  if [[ -z "${CLIENTS_TO_SHOW}" ]]; then
    err "::: You can not leave this blank!"
    exit 1
  fi
fi

for CLIENT_NAME in "${CLIENTS_TO_SHOW[@]}"; do
  re='^[0-9]+$'

  if [[ "${CLIENT_NAME:0:1}" == "-" ]]; then
    err "${CLIENT_NAME} is not a valid client name or option"
    exit 1
  elif [[ "${CLIENT_NAME}" =~ $re ]]; then
    CLIENT_NAME="${LIST[$((CLIENT_NAME - 1))]}"
  fi

  if grep -qw "${CLIENT_NAME}" clients.txt; then
    echo -e "::: Showing client \e[1m${CLIENT_NAME}\e[0m below"
    echo "====================================================================="

    qrencode -t "${encoding}" < "${CLIENT_NAME}.conf"

    echo "====================================================================="
  else
    echo -e "::: \e[1m${CLIENT_NAME}\e[0m does not exist"
  fi
done