#!/usr/bin/env bash

system="$(uname)"

if [[ "Linux" = "$system" ]] ; then
  for file in /etc/*-release ; do
    release="( $(cat $file) )" ; break
  done
  printf "\n\nNotes for ${system} $release\n"

  rvm_aptitude_binary="$(command -v aptitude || command -v apt-get)"
  rvm_emerge_binary="$(command -v emerge)"
  rvm_pacman_binary="$(command -v pacman)"
  rvm_yum_binary="$(command -v yum)"

  printf "
# NOTE: MRI stands for Matz's Ruby Interpreter (1.8.X, 1.9.X), ree stands for Ruby Enterprise Edition and rbx stands for Rubinius.
# curl is required.
# git is required.
# patch is required (for ree, some ruby head's).
# If you wish to install rbx and/or any MRI head (eg. 1.9.2-head) then you must install and use rvm 1.8.7 first.
# If you wish to have the 'pretty colors' again, set 'export rvm_pretty_print_flag=1' in ~/.rvmrc.
"

  if [[ ! -z "$rvm_aptitude_binary" ]] ; then
    printf "
dependencies:
# For RVM
  rvm: bash curl git

# For JRuby (if you wish to use it) you will need:
  jruby: aptitude install curl sun-java6-bin sun-java6-jre sun-java6-jdk

# For MRI & ree (if you wish to use it) you will need (depending on what you are installing):
  ruby: aptitude install build-essential bison openssl libreadline5 libreadline-dev curl git zlib1g zlib1g-dev libssl-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev
  ruby-head: git subversion autoconf

# For IronRuby (if you wish to use it) you will need:
  ironruby: aptitude install curl mono-2.0-devel
"

  elif [[ ! -z "$rvm_emerge_binary" ]] ; then
    printf "
dependencies:
  # For RVM
  rvm: bash curl git

  # For MRI based rubies you will need:
  ruby: # TODO: tell Wayne what goes here :)
  ruby-head: # TODO: tell Wayne what goes here :)

  # For JRuby (if you wish to use it) you will need:
  jruby: emerge dev-java/sun-jdk dev-java/sun-jre-bin

  # For IronRuby (if you wish to use it) you will need:
  ironruby: emerge dev-lang/mono
    "

  elif [[ ! -z "$rvm_pacman_binary" ]] ; then
    printf "
dependencies:
  # For RVM itself
  rvm: bash curl git

  # For MRI based rubies you will need:
  ruby: pacman -Sy --noconfirm patch curl bison zlib readline libxml2 git make
  ruby-head: pacman -Sy --noconfirm subversion autoconf diffutils patch bison make

  # For JRuby (if you wish to use it) you will need:
  jruby: pacman -Sy --noconfirm jdk jre curl

  # For IronRuby (if you wish to use it) you will need:
  ironruby: pacman -Sy --noconfirm mono
"

  elif [[ ! -z "$rvm_yum_binary" ]] ; then
    printf "
dependencies:
  # For RVM
  rvm: yum install -y bash curl git

  # For MRI/ree (if you wish to use it) you will need:
  ruby: yum install -y gcc-c++ patch readline readline-devel zlib zlib-devel libyaml-devel libffi-devel ; \\
        yum install -y iconv-devel # NOTE: For centos 5.4 final iconv-devel might not be available :(

  # For JRuby (if you wish to use it) you will need:
  jruby: yum install -y java
"

  else
    printf "
dependencies:
  # RVM
  rvm: bash curl git

  # FOR MRI Ruby, recommended system packages are
  ruby: # gcc-c++ patch readline zlib libyaml iconv libxml2 libxslt

  # For JRuby (if you wish to use it) you will need:
  jruby: #The SUN java runtime environment and development kit.

  # For IronRuby (if you wish to use it) you will need:
  ironruby: #The Mono Runtime and Development Platform (version 2.6 or greater is recommended).
"
  fi
elif [[ "Darwin" = "$system"  ]] ; then

  release="( $(sw_vers -productName) )"

  printf "
  Notes for ${system} $release
    # For Snow Leopard be sure to have Xcode Tools Version 3.2.1 (1613) or later (there were bugs with the dvd release version).
    # You should download the latest Xcode tools from developer.apple.com. This is necessary since the dvd install for Snow Leopard has bugs.
    # If you intend on installing MacRuby you must install LLVM first.
    # If you intend on installing JRuby you must install the JDK.
    # If you intend on installing IronRuby you must install Mono (version 2.6 or greater is recommended).
  "
fi

echo