#!/bin/bash

user=`whoami`
if [ "$user" = "root" ] ; then 
  echo -e "\e[0;31m <e> \e[0mroot user support is not yet implemented.\e[0m"
  exit 1
fi

info="\n\e[0;32m<i>\e[0m"
question="\n\e[0;32m<?>\e[0m"

echo -e "Installing rvm source to ~/.rvm/bin/rvm..."
mkdir -p ~/.rvm/src ~/.rvm/bin
cp $(pwd)/bash/rvm ~/.rvm/bin/

# State what is required to use rvm
echo -e "\n\e[0;32mrvm\e[0m is a shell script that allows a user to manage multiple ruby versions in their own account."
echo -e "$info In order to use rvm two items must occur in your shell's load paths:"
echo -e "\n\e[0;32m    (a)\e[0m if [ -f ~/.rvm/bin/rvm ] ; then source ~/.rvm/bin/rvm ; fi"
echo -e "\e[0;32m    (b)\e[0m if [ -f ~/.rvm/current ] ; then source ~/.rvm/current ; fi"

echo -n -e "$question Would you like (u)s to set this up for you, or do it (y)ourself (u/y)? "
while : ; do
  read response
  if [ "${response:0:1}" = "u" ] ; then
    echo 'w00t!'
    break
  elif [ "${response:0:1}" = "f" ] ; then
    echo -e "$info Please make sure that both lines (a) and (b) are in place, with (a) sourced *first*."
    break
  else
    echo -n -e "$question Would you like (u)s to set this up for you, or do it yoursel(f) (u/f)? "
  fi
done

if [ "${response:0:1}" = "u" ] ; then

  # Find out the user's shell bash / zsh
  echo -n -e "$question Do you use (b)ash or (z)sh for your shell (the default on most *nix systems is bash, press control + C to cancel the installation)\n(b/z) ? "
  while : ; do
    read response
    if [ "${response:0:1}" = "b" ] ; then
      user_shell="bash"
      break
    elif [ "${response:0:1}" = "z" ] ; then
      user_shell="zsh"
      break
    else
      echo -n -e "$question Do you use (b)ash or (z)sh for your shell (the default on most *nix systems is bash, press control + C to cancel the installation)\n(b/z) ? "
    fi
  done
  
  touch ~/.profile
  
  if [ "$user_shell" = "bash" ] ; then
  
    touch ~/.bash_profile
    if [ -z "`grep '\.rvm/bin/rvm' ~/.bash_profile`" ] ; then
      echo "Adding 'if [ -f ~/.rvm/bin/rvm ] ; then source ~/.rvm/bin/rvm ; fi' to your ~/.bash_profile."
      echo "if [ -f ~/.rvm/bin/rvm ] ; then source ~/.rvm/bin/rvm ; fi" >> ~/.bash_profile
    fi
    
    if [ -z "`grep '\.rvm/current' ~/.bash_profile`" ] ; then
      echo "Adding 'if [ -f ~/.rvm/current ] ; then source ~/.rvm/current ; fi' ~/.bash_profile."
      echo "if [ -f ~/.rvm/current ] ; then source ~/.rvm/current ; fi" >> ~/.bash_profile
    fi
  
  elif [ "$user_shell" = "zsh" ] ; then
  
    touch ~/.zshrc
    if [ -z "`grep '\.rvm/bin/rvm' ~/.zshrc`" ] ; then
      echo "Adding 'if [ -f ~/.rvm/bin/rvm ] ; then source ~/.rvm/bin/rvm ; fi' to your ~/.zshrc."
      echo "if [ -f ~/.rvm/bin/rvm ] ; then source ~/.rvm/bin/rvm ; fi" >> ~/.zshrc
    fi
    
    if [ -z "`grep '\.rvm/current' ~/.zshrc`" ] ; then
      echo "Adding 'if [ -f ~/.rvm/current ] ; then source ~/.rvm/current ; fi' ~/.zshrc."
      echo "if [ -f ~/.rvm/current ] ; then source ~/.rvm/current ; fi" >> ~/.zshrc
    fi
  
  else
  
    echo -e "\n\e[0;31m<e> An error has occurred, we were expecting either bash or zsh however we encountered $user_shell \e[0m"
    return 1
  
  fi
fi

echo -e "\n$info If you add ~/.rvm/bin/ to your path you will be able to rever to installed ruby binaries using: <implementation>-<version>p<patchlevel>"
echo -e "     For example: ~/.ruby-1.9.1p243 -e 'puts \"hello world\"' #=> hello world"
echo -e "$info Contact wayneeseguin on irc.freenod.net in #rvm for any questions / feedback."
echo -e "     I truely hope that you find rvm helpful! Thank you very much for using rvm. \n"
echo -e "       ~ Wayne"

echo -e "$info To start using rvm see: \e[0;32m rvm usage\e[0m, Now close this login shell and open a new one."