#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# FILE: autossh
# DESCRIPTION: This is an SSH-D proxy with auto-reconnect on disconnect
# AUTHOR: Toan Nguyen (nntoan at protonmail dot com)
# VERSION: 1.0.0
# USAGE: autossh your_user@your_server_ip
# shellcheck disable=SC2034,SC2182,SC2162,SC2236,SC2120,SC2009,SC2119,SC2086,SC2059,SC2006
# ------------------------------------------------------------------------------
VERSION="1.0.0"
GITHUB="https://github.com/nntoan/autossh"
AUTHOR="Toan Nguyen"
SCRIPT=${0##*/}
IFS=$'\n'
ALIVE=0
HISTFILE="$HOME/.autossh.history"

# Use colors, but only if connected to a terminal, and that terminal supports them.
if type -P tput >/dev/null 2>&1; then
  ncolors=$(tput colors)
fi
if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
  RED="$(tput setaf 1)"
  GREEN="$(tput setaf 2)"
  YELLOW="$(tput setaf 3)"
  BLUE="$(tput setaf 4)"
  BOLD="$(tput bold)"
  NORMAL="$(tput sgr0)"
else
  RED=""
  GREEN=""
  YELLOW=""
  BLUE=""
  BOLD=""
  NORMAL=""
fi

# Progress or something
start_progress()
{
  while true
  do
    echo -ne "#"
    sleep 1
  done
}

quick_progress()
{
  while true
  do
    echo -ne "#"
    sleep .033
  done
}

long_progress()
{
  while true
  do
    echo -ne "#"
    sleep 3
  done
}

dot_progress()
{
  for i in {1..100}; do
    printf "." $i -1 $i
    sleep .033
  done
  echo_c green " 100%{$NORMAL}"
  sleep 1
}

stop_progress()
{
  kill $1
  wait $1 2>/dev/null
  echo -en "\n"
}

# Case-insensitive for regex matching
shopt -s nocasematch

# Prepare history mode
set -i
history -c
history -r

# Input method
get_input()
{
  read -e -p "${BLUE}$1${NORMAL}" "$2"
  history -s "${!2}"
}

# Echo in bold
echo_b()
{
  if [ "$1" = "-e" ]; then
    echo -e "${BOLD}$2${NORMAL}"
  else
    echo "${BOLD}$1${NORMAL}"
  fi
}

# Echo in colour
echo_c()
{
  case "$1" in
    red | r | -red | -r | --red | --r ) echo "${RED}$2${NORMAL}" ;;
    green | g | -green | -g | --green | --g ) echo "${GREEN}$2${NORMAL}" ;;
    blue | b | -blue | -b | --blue | --b ) echo "${BLUE}$2${NORMAL}" ;;
    yellow | y | -yellow | -y | --yellow | --y ) echo "${YELLOW}$2${NORMAL}" ;;
    * ) echo "$(BOLD)$2$(RESET)" ;;
  esac
}

# Get data from parameters
if [[ ! -n "$remote_param" && -n "$1" ]]; then
    remote_param="$1"
    remote_user="${remote_param%%@*}"
    remote_ip="${remote_param##*@}"
fi

# Get input data and save to history
save_input()
{
  if [[ ! -n "$remote_user" && ! -n "$1" ]]; then
    while get_input "SSH Username > " remote_user; do
      case ${remote_user%% *} in
        * )
            if [ -n "$remote_user" ]; then
              break
            else
              continue
            fi
        ;;
      esac
    done
  fi
  if [[ ! -n "$remote_ip" && ! -n "$1" ]]; then
    while get_input "SSH Alias/IP-address > " remote_ip; do
      case ${remote_ip%% *} in
        * )
            if [ -n "$remote_ip" ]; then
              break
            else
              continue
            fi
        ;;
      esac
    done
  fi
}

# Infinitie loop to keep connecting
auto_connect()
{
  while true; do
    exist=`ps aux | grep $remote_user@$remote_ip | grep 22`
    if test -n "$exist"
    then
      if test $ALIVE -eq 0
      then
        echo_c yellow "I'm alive since $(date)"
      fi
      ALIVE=1
    else
      ALIVE=0
      echo_c red "I'm dead... God is bringing me back..."
      clear
      printf "${GREEN}Connecting: "
      for i in {1..100}; do
        printf "." "$i" -1 "$i"
        sleep .033
      done
      echo_c green " 100%${NORMAL}"
      sleep 1
      clear
      ssh $remote_user@$remote_ip
    fi
    sleep 1
  done
}

main()
{
  save_input
  auto_connect
}

main