#!/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"

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

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

  while : ; do
    echo -n -e "$question Do you use b(a)sh or (z)sh or b(o)th for your shell (the default on most *nix systems is bash, press control + C to cancel the installation)\n(a/z/o)? "
    read response
    if [ "${response:0:1}" = "a" ] ; then
      user_shell="bash"
      break
    elif [ "${response:0:1}" = "z" ] ; then
      user_shell="zsh"
      break
    elif [ "${response:0:1}" = "o" ] ; then
      user_shell="both"
      break
    fi
  done
  
  touch ~/.profile
  
  if [ "$user_shell" = "bash" -o "$user_shell" = "both" ] ; 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 [ "$user_shell" = "zsh" -o "$user_shell" = "both" ] ; 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

system=`uname`
if [ "$system" = "Linux" ] ; then
  echo -e "For jRuby (if you wish to use it) you will need:"
  if [ ! -z "`which apt-get`" ] ; then
    echo -e " sudo apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk  "
  elif [ ! -z "`which emerge`" ] ; then
    echo -e "emerge dev-java/sun-jdk dev-java/sun-jre-bin"
  elif [ ! -z "`which pacman`" ] ; then
    echo -e "pacman -Sy jdk jre"
  elif [ ! -z "`which yum`" ] ; then
    echo -e "yum install -y rpm-build gcc gcc-c++ redhat-rpm-config ; then download and rpmbuild and install the sdk, Have fun..."
  else
    echo -e "The SUN java runtime environment and development kit."
  fi
#elif [ "$sytem" = "Darwin" ] ; then
#else

fi

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