#!/bin/bash

# __rvm_select implementation version patch_level
function __rvm_select {

  __rvm_ruby_string

  rvm_ruby_interpreter="${1:-$rvm_ruby_interpreter}"
  rvm_ruby_interpreter="${rvm_ruby_interpreter:-ruby}" # Default is standard ruby

  temp=$(echo $rvm_ruby_interpreter | awk '{print substr($1, 0, 1)}')
  if [ ! -z "$(echo $temp | grep '[0-9]')" ] ; then
    rvm_ruby_version=$rvm_ruby_interpreter
    rvm_ruby_interpreter="ruby"
  fi ; unset temp

  if [ "$rvm_ruby_version" = "1.8" ] ; then rvm_ruby_version="1.8.6" ; fi
  if [ "$rvm_ruby_version" = "1.9" ] ; then rvm_ruby_version="1.9.1" ; fi

  case "$rvm_ruby_interpreter" in

    macruby)
      if [ "`uname`" = "Darwin" ] ; then
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-`__rvm_db "macruby_repo_url"`}"
        rvm_ruby_version="${rvm_ruby_version:-`__rvm_db "macruby_version"`}"
        rvm_ruby_package_name=${rvm_ruby_interpreter}_nightly-${rvm_ruby_version}
        rvm_url="http://dl.getdropbox.com/u/163257/$rvm_ruby_package_name.pkg" # For now we are only supporting the 'nightly' builds
        unset rvm_ruby_patch_level
      else
        __rvm_log "fail" "MacRuby can only be installed on a Darwin OS."
      fi
    ;;

    rbx|rubinius)
      rvm_ruby_version="head"
      unset rvm_ruby_patch_level
      rvm_ruby_interpreter="rubinius"
      rvm_ruby_repo_url=`__rvm_db "rubinius_repo_url"`
      rvm_ruby_configure=""
      rvm_ruby_make="build"
      rvm_ruby_make_install=""
      #rvm_ruby_rev="head"
    ;;

    jruby)
      rvm_ruby_version="${rvm_ruby_version:-`__rvm_db "jruby_version"`}"
      unset rvm_ruby_patch_level
      if [ "$rvm_ruby_version" != "1.2.0" -a "$rvm_ruby_version" != "1.3.1" ] ; then
        __rvm_log "fail" "Unknown jRuby version: $rvm_ruby_version"
      fi
      alias jruby_ng="jruby --ng"
      alias jruby_ng_server="jruby --ng-server"
    ;;

    ruby-enterprise|ree)
      rvm_ruby_interpreter=`__rvm_db "ree_interpreter"`
      rvm_ruby_version=${rvm_ruby_version:-`__rvm_db "ree_version"`}
      rvm_ruby_patch_level="${3:-`__rvm_db "ree_patch_level"`}"

      if [ "$rvm_ruby_version" != "1.8.6" ] ; then
        __rvm_log "fail" "Unknown Ruby Enterprise Edition version: $rvm_ruby_version"
      fi
    ;;

    ruby)
      if [ ! -z "$rvm_ruby_tag" ] ; then
        rvm_ruby_version=$(echo $rvm_ruby_tag | sed 's/^v//' | sed 's/\///' | awk -F'_' '{print 1 "." $2 "." $3 }')
        rvm_ruby_patch_level=$rvm_ruby_tag # $(echo $rvm_ruby_tag | sed 's/^v//' | sed 's/\///' | awk -F'_' '{print $4 }')
      fi

      rvm_ruby_version=${rvm_ruby_version:-`__rvm_db "ruby_version"`} # Default verison is 1.8.6
      rvm_ruby_patch_level=${rvm_ruby_patch_level:-`__rvm_db "ruby_${rvm_ruby_version}_patch_level"`} # Default verison is 1.8.6
      if [ -z "rvm_ruby_patch_level" ] ; then unset rvm_ruby_patch_level ; fi

      if [ -z "rvm_ruby_version" ] ; then
        __rvm_log "fail" "Unknown ruby version: $rvm_ruby_version"
      fi
    ;;

    default|system|current|user)
      #no-op?
    ;;
    *)
      __rvm_log "fail" "Ruby implementation '$rvm_ruby_interpreter' is not known."
  esac

  if [ ! -z "$rvm_ruby_rev" ] ; then
    if [ "$rvm_ruby_rev" = "head" -o "$rvm_ruby_rev" = "trunk" ] ; then
      rvm_ruby_patch_level="head"
    else
      rvm_ruby_patch_level="$rvm_ruby_rev"
    fi
  fi

  if [ ! -z "$rvm_ruby_interpreter" -a ! -z "$rvm_ruby_version" -a "$rvm_ruby_interpreter" != "system" ] ; then
    rvm_major_version=$(echo $rvm_ruby_version | awk -F'.' '{ print $2 }')
    rvm_minor_version=$(echo $rvm_ruby_version | awk -F'.' '{ print $3 }')

    if [ -z "$rvm_gem_set_name" ] ; then
      rvm_gem_home="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version"
    else
      if [ ! -z "$rvm_gem_set_name_rm" -a -d $rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version-$rvm_gem_set_name ] ; then
        rm -rf $rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version-$rvm_gem_set_name/
        if [ "$rvm_gem_set_name_rm" = "$rvm_gem_set_name" ] ; then unset rvm_gem_set_name ; fi
      else
        rvm_gem_home="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version-$rvm_gem_set_name"
      fi
    fi

    if [ ! -z "$rvm_load" ] ; then __rvm_gemset_load ; fi
    if [ ! -z "$rvm_dump" ] ; then __rvm_gemset_dump ; fi

    mkdir -p $rvm_gem_home

    if [ -z "$rvm_ruby_patch_level" ] ; then
      rvm_ruby_package_name="${rvm_ruby_package_name:-"$rvm_ruby_interpreter-$rvm_ruby_version"}"
      rvm_ruby_home="${rvm_ruby_home:-"$rvm_path/$rvm_ruby_interpreter-$rvm_ruby_version"}"
    else
      if [ "`echo $rvm_ruby_patch_level | awk '{print substr($1, 0, 1)}'`" != "p" ] ; then
        rvm_ruby_patch_level="p$rvm_ruby_patch_level"
      fi
      rvm_ruby_package_name="${rvm_ruby_package_name:-"$rvm_ruby_interpreter-$rvm_ruby_version-$rvm_ruby_patch_level"}"
      rvm_ruby_home="${rvm_ruby_home:-"$rvm_path/$rvm_ruby_interpreter-$rvm_ruby_version-$rvm_ruby_patch_level"}"
    fi
    rvm_ruby_log_path="$rvm_log_path/$rvm_ruby_package_name"
    rvm_ruby_src_path="$rvm_source_path/$rvm_ruby_package_name"
    rvm_ruby_binary="$rvm_ruby_home/bin/ruby"
    rvm_ruby_irbrc="$rvm_ruby_home/.irbrc"
    rvm_ruby_string="$rvm_ruby_package_name"
    rvm_selected=1

    export rvm_ruby_interpreter rvm_ruby_version rvm_ruby_repo_url rvm_ruby_version rvm_ruby_package_name rvm_url rvm_ruby_patch_level rvm_ruby_configure rvm_ruby_make rvm_ruby_make_install rvm_ruby_rev rvm_ruby_tag rvm_major_version rvm_minor_version rvm_gem_set_name rvm_gem_path rvm_gem_home rvm_path rvm_source_path rvm_bin_path rvm_ruby_binary rvm_ruby_package_name rvm_ruby_home rvm_log_path rvm_ruby_log_path rvm_source_path rvm_ruby_src_path rvm_ruby_irbrc rvm_selected rvm_ruby_string

  else
    rvm_gem_home=$GEM_HOME
  fi

}

function __rvm_use {

  if [ -z "$rvm_selected" ] ; then __rvm_select $* ; fi
  if [ -z "$rvm_ruby_interpreter" ] ; then rvm_ruby_interpreter="default" ; fi

  if [ "$rvm_ruby_interpreter" = "default" ] ; then

    if [ -s $rvm_path/default ] ; then
      source $rvm_path/default
    else
      __rvm_log "error" "no default rvm specified, defaulting to pre-rvm sytem."
      unset GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC
      PATH="$rvm_system_path" ; export PATH
      if [ -s $rvm_path/system ] ; then source $rvm_path/system ; fi
    fi

  elif [ "$rvm_ruby_interpreter" = "system" ] ; then

    unset GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC
    PATH="$rvm_system_path" ; export PATH
    if [ -s $rvm_path/system ] ; then
      grep "^MY_RUBY_HOME='$rvm_path" "$rvm_path/system" > /dev/null
      if [ $? -eq 0 ] ; then
        rm -f $rvm_path/system # 'system' should *not* point to an rvm ruby.
      else
        source $rvm_path/system
      fi
    fi

  else
    GEM_HOME=$rvm_gem_home ; export GEM_HOME
    GEM_PATH=$rvm_gem_home ; export GEM_PATH
    MY_RUBY_HOME=$rvm_ruby_home ; export MY_RUBY_HOME
    RUBY_VERSION=$rvm_ruby_package_name ; export RUBY_VERSION
    IRBRC="$rvm_ruby_irbrc" ; export IRBRC
    if [ -z "$IRBRC" ] ; then unset IRBRC ; fi

    # Install if not installed
    if [ ! -d $MY_RUBY_HOME ] ; then
      __rvm_log "warn" "$rvm_ruby_interpreter $rvm_ruby_version is not installed."
      echo -n -e "Would you like rvm to install $rvm_ruby_interpreter $rvm_ruby_version for you now?\n(Y/n) ? "
      read response
      if [ "$response" = 'n' ] ; then
        __rvm_log "warn" "Please run 'rvm install $rvm_ruby_interpreter $rvm_ruby_version' if you wish to use it.\n"
        return 0
      else
        __rvm_install-ruby $rvm_ruby_interpreter $rvm_ruby_version $rvm_ruby_patch_level
      fi
    fi

    __rvm_irbrc

    PATH="$MY_RUBY_HOME/bin:$GEM_HOME/bin:$rvm_path/bin:$rvm_system_path" ; export PATH

    if [ ! -z "$rvm_set_default" ] ; then
      RUBY_VERSION="$($MY_RUBY_HOME/bin/ruby -v | sed 's/^\(.*\) (.*$/\1/')"
      export GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION

      echo "PATH=$MY_RUBY_HOME/bin:$GEM_HOME/bin:$rvm_path/bin:\$PATH ; export PATH" > $rvm_path/default

      for variable in RUBY_VERSION GEM_HOME GEM_PATH MY_RUBY_HOME IRBRC ; do
        eval "export $variable"
        eval value=\$${variable}
        if [ ! -z "$variable" ] ; then
          echo "${variable}='$value' ; export ${variable}" >> $rvm_path/default
        else
          echo "unset ${variable}" >> $rvm_path/default
        fi
      done

      if [ -s $rvm_path/bin/$rvm_ruby_package_name ] ; then
        ln -fs $rvm_path/bin/$rvm_ruby_package_name $rvm_path/bin/ruby
        ln -fs $rvm_path/bin/$rvm_ruby_package_name $rvm_path/bin/default-ruby # So that people know what it's for :)
        ln -fs $rvm_path/bin/gem-$rvm_ruby_package_name $rvm_path/bin/gem
        ln -fs $rvm_path/bin/irb-$rvm_ruby_package_name $rvm_path/bin/irb
      else
        rm -f $rvm_path/bin/ruby
        rm -f $rvm_path/bin/default-ruby
        rm -f $rvm_path/bin/gem
        rm -f $rvm_path/bin/irb
      fi

      unset rvm_set_default
    fi
  fi
}