main

#!/bin/bash

main() {
  case $1 in
    display|vnc|term|droid)
      ./$1 ${@:2}
    ;;
    ssh)
      ssh ${@:2}
    ;;
    setup)
      setup
    ;;
    usb)
      usb
    ;;
    *)
      help
    ;;
  esac
}

ssh() {
  if [ "$1" == "setup" ]; then
    mkdir .ssh
    ssh-keygen -t rsa -f ./.ssh/ssh_host_rsa_key
    ssh-keygen -t ecdsa -f ./.ssh/ssh_host_ecdsa_key
    ssh-keygen -t ed25519 -f ./.ssh/ssh_host_ed25519_key
  else
    sudo service ssh $1
  fi
  # it won't be so easy, we may need to start a new ssh server with custom settings.
  # To do so, we need to create ssh keys for our server, since we can't point to user ones.
  # /usr/sbin/sshd -p 22200 
}

setup() {
  # x11vnc 		- vnc server used to bind to part o xServer
  # bc 			- bash calculator, as we can't do some operations with default bash
  # screen 		- terminal used to share session, like vnc but with terminal
  # openssh-server 	- secure shell, a tool to connect to terminal remotely
  sudo apt-get install x11vnc bc screen openssh-server
}

DOC+=" 
 usb
  - Print devices connected to usb 
" 
usb() { 
  lsusb | grep --color -P "\w+:\w+"  
}

help() {
  cat <<TEXT
Virtual Display Helper

Commands
 display
  - Use to manage virtual display. With it we can also calculate suggested resolution for device.

 vnc
  - Wrapper for vnc commands. With it is possible to start vnc for a specific display or a window

 ssh <start|stop|restart>
  - command ssh server, just a wrapper to start, stop or restart the ssh server daemon.
    This will be needed to run screen commands

 term
  - Wrapper to share terminal with others. They may need to connect using ssh.

 droid
  - send commands to android

 setup
  - install necessary tools
$DOC
 help
  - show this message
TEXT
}

main $@