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#!/bin/bash

bold=$(tput bold)
normal=$(tput sgr0)

if [ "$EUID" -ne 0 ]
  then 
  printf "This script must be run as root.\n"
  exit 1
fi

if [ ! -d "$DIRECTORY" ]; then mkdir -p /etc/purevpn; fi
if [ ! -f /etc/purevpn/vpn-list.tsv ]; then ln -s /usr/lib/purevpn/vpn-list.tsv /etc/purevpn/; fi

usage() {
  cat <<EOF
usage: ${0##*/} [OPTION]

Options:
    -h            Print this help message and exit
    -l            List the available cities files and exit
    -c [city]     Choose a city for which to install the OpenVPN config
                  This option can be used multiple times. e.g. -c Lima -c New\ York
                  (NOTE: just use the city name, the part that is ${bold}bold or
                  coloured${normal} (if supported) when you run "purevpn  -l") 
    -t [protocol] Choose the protocol to install (either "pptp" or "ovpn")
                  This option can be used multiple times. e.g. -t pptp -t ovpn
    -u [username] Set the username in all PureVPN files in /etc/NetworkManager
    -p [password] Set the password in all PureVPN files in /etc/NetworkManager
    -x            Purge all the PureVPN files in /etc/NetworkManager and exit
    -z            Attempt to update the VPN server list from
                  https://support.purevpn.com/vpn-servers and exit

If 'OPTION' is unspecified, ${0##*/} will not make any changes.

EOF
}

updlist() {
  printf "==> Updating the list of VPN servers from https://support.purevpn.com/vpn-servers\n"
  rm -v /etc/purevpn/vpn-list.tsv
  
  ## Lots of credit to: https://stackoverflow.com/a/10189130/6047155
  curl "https://support.purevpn.com/vpn-servers" 2>/dev/null | \
    grep -i -e '</\?TABLE\|</\?TD\|</\?TR\|</\?TH' | \
    sed 's/^[\ \t]*//g' | tr -d '\n' | \
    sed 's/<\/TR[^>]*>/\n/Ig;s/<\/\?\(TABLE\|TR\)[^>]*>//Ig' | \
    sed 's/^<T[DH][^>]*>\|<\/\?T[DH][^>]*>$//Ig;s/<\/T[DH][^>]*><T[DH][^>]*>/\t/Ig' | \
    sed 's/<[^<>]*>//g;s/\s*\t\s*/\t/g;1d' | \
    sed -E "s/(pointtoserver\.com)(\S+\-ovpn\-udp)/\1\t\2/g" > /etc/purevpn/vpn-list.tsv
  printf "==> New server list contains $(wc -l < /etc/purevpn/vpn-list.tsv) lines.\n"
}

list() {
  printf "==> The following VPN locations are available\n"
  while IFS=$'\t' read region country city pptp udp tcp
  do
    echo "$region/$country, ${bold}\""$city\""${normal}"
  done < /etc/purevpn/vpn-list.tsv
}

get_pptp_url() {
  while IFS=$'\t' read region country city pptp udp tcp
  do
    if [ "${city}" == "${config}" ]; then
    printf "$pptp"
    fi
  done < /etc/purevpn/vpn-list.tsv
}

get_tcp_url() {
  while IFS=$'\t' read region country city pptp udp tcp
  do
    if [ "${city}" == "${config}" ]; then
    printf "$tcp"
    fi
  done < /etc/purevpn/vpn-list.tsv
}

get_upd_url() {
  while IFS=$'\t' read region country city pptp udp tcp
  do
    if [ "${city}" == "${config}" ]; then
    printf "$udp"
    fi
  done < /etc/purevpn/vpn-list.tsv
}

process_ovpn() {
  printf "Creating OpenVPN config for $config\n"
  cleanconfig=$(echo $config | tr -d '[:punct:]|[:space:]')
  mkdir -p /tmp/purevpn
  for proto in TCP UDP
  do
    filename=$(printf "PureVPN-${cleanconfig}-${proto}")
    cp "/usr/lib/purevpn/template-ovpn" "/tmp/purevpn/${filename}"
    if [ "$proto" == "UDP" ]
    then
      host=$(get_upd_url)
      port=53
    elif [ "$proto" == "TCP" ]
    then
      host=$(get_tcp_url)
      port=80
      sed -i '/port=/a \proto-tcp=yes' "/tmp/purevpn/${filename}"
    fi
    if [[ $host == "" ]]; then
      printf "Looks like there is no host for this city and protocol.\n"
      exit 1
    fi
    sed -i "s/\bid=/&${filename}/" "/tmp/purevpn/${filename}" #id
    sed -i "s/\buuid=/&$(uuidgen)/" "/tmp/purevpn/${filename}" #uuid
    sed -i "s/\bport=/&${port}/" "/tmp/purevpn/${filename}" #port
    sed -i "s/\bremote=/&$host:${port}/" "/tmp/purevpn/${filename}" #host
    chmod 600 "/tmp/purevpn/${filename}" #permissions
    mv "/tmp/purevpn/${filename}" /etc/NetworkManager/system-connections
  done
}

process_pptp() {
  printf "Creating PPTP config for $config\n"
  mkdir -p /tmp/purevpn
  cleanconfig=$(echo $config | tr -d '[:punct:]|[:space:]')
  filename=$(printf "PureVPN-${cleanconfig}-PPTP")
    cp "/usr/lib/purevpn/template-pptp" "/tmp/purevpn/${filename}"
    host=$(get_pptp_url)
    if [[ $host == "" ]]; then
      printf "Looks like there is no host for this city and protocol.\n"
      exit 1
    fi
    sed -i "s/\bid=/&${filename}/" "/tmp/purevpn/${filename}" #id
    sed -i "s/\buuid=/&$(uuidgen)/" "/tmp/purevpn/${filename}" #uuid
    sed -i "s/\bgateway=/&$host/" "/tmp/purevpn/${filename}" #host
    chmod 600 "/tmp/purevpn/${filename}" #permissions
    mv "/tmp/purevpn/${filename}" /etc/NetworkManager/system-connections
}

addpass() {
  cd /etc/NetworkManager/system-connections
  find -iname "*PureVPN*" -print0 | while read -d $'\0' file
  do
    sed -i "s/\bpassword=.*/password=${passw}/g" "$file"
  done
}

adduser() {
  cd /etc/NetworkManager/system-connections
  find -iname "*PureVPN*" -print0 | while read -d $'\0' file
  do
    if [[ $file == *"PPTP"* ]]; then
      sed -i "s/\buser=.*/user=${uname}/g" "$file"
    else
      sed -i "s/\busername=.*/username=${uname}/g" "$file"
    fi
  done
}

clean() {
  printf "Purging all PureVPN files!\n"
  find /etc/NetworkManager/system-connections -iname "*PureVPN*" -exec rm -v {} \;
}

while getopts "hlc:t:u:p:xz" opt
  do
    case $opt in
      h) 
        usage
        exit 0
        ;;
      l)
        list
        exit 0
        ;;
      c)
        configs+=("${OPTARG}")
        ;;
      t)
        protocs+=("${OPTARG}")
        ;;
      u)
        uname=$OPTARG
        ;;
      p) 
        passw=$OPTARG
        ;;
      x)
        clean
        exit 0
        ;;
      z)
        updlist
        exit 0
        ;;
      \?)
        usage
        exit 1
        ;;
    esac
  done

## Main script

if [ -z "$protocs" ];
then
  if [[ -v uname ]] || [[ -v passw ]];
  then
    SKIPCITY="true"
  else
    printf "No protocol was specified. No files will be installed.\n"
    exit 1;
  fi
fi

if [ -z "$configs" ];
then
  if [[ -v uname ]] || [[ -v passw ]];
  then
    SKIPCITY="true"
  else
    printf "No city specified. No files will be installed.\n"
    exit 1;
  fi
fi

if [ -z "$SKIPCITY" ];
then
  for config in "${configs[@]}"; do
    if list | grep "${config}" > /dev/null; then
      for protoc in "${protocs[@]}"; do
        if [ "$protoc" == "pptp" ]; then
          process_pptp
        elif [ "$protoc" == "ovpn" ]; then
          process_ovpn
        else
          printf "$protoc does not seem to be a valid protocol. Choose pptp or ovpn.\n"
          warn;
        fi
      done
    else
      printf "We couldn't find a city called $config.\n"
      printf "Try running purevpn -l to list available cities.\n"
      exit 1;
    fi
  done
fi

if [[ -z "$uname" ]]; then 
  printf "No username was specified.\n"
else
  printf "Adding the username to the installed config files.\n"
  adduser
fi

if [[ -z "$passw" ]]; then 
  printf "No password was specified.\n"
else
  printf "Adding the password to the installed config files.\n"
  addpass
fi

printf "Restarting NetworkManager.\n"
systemctl restart NetworkManager

exit 0