#!/bin/bash

# __rvm_select implementation version patch_level
function __rvm_select {
  if [[ -z "$rvm_ruby_string" ]] ; then
    rvm_ruby_string="${rvm_ruby_interpreter}"
    if [[ ! -z "$rvm_ruby_version" ]] ; then rvm_ruby_string="$rvm_ruby_string-$rvm_ruby_version" ; fi
    if [[ ! -z "$rvm_ruby_patch_level" ]] ; then rvm_ruby_string="$rvm_ruby_string-$rvm_ruby_patch_level" ; fi
    if [[ ! -z "$rvm_ruby_revision" ]] ; then rvm_ruby_string="$rvm_ruby_string-$rvm_ruby_revision" ; fi
  fi

  __rvm_ruby_string

  case "$rvm_ruby_interpreter" in
    macruby)
      if [[ "Darwin" = "$(uname)" ]] ; then
        rvm_ruby_package_name=${rvm_ruby_interpreter}-${rvm_ruby_version}
        if [[ "$rvm_head_flag" -eq 1 ]] ; then
          unset rvm_ruby_version rvm_ruby_tag
          rvm_ruby_revision="head"
          rvm_ruby_repo_url=${rvm_ruby_repo_url:-"$(__rvm_db "macruby_repo_url")"}
          rvm_url="$rvm_ruby_repo_url"
          rvm_ruby_string="${rvm_ruby_interpreter}-head"
        elif [[ "nightly" = "$rvm_ruby_version" ]] ; then
          rvm_url="http://macruby.icoretech.org/latest"
          rvm_ruby_string="${rvm_ruby_interpreter}-${rvm_ruby_version}"
        else
          rvm_ruby_version="${rvm_ruby_version:-"$(__rvm_db "macruby_version")"}"
          rvm_ruby_package_name="${rvm_ruby_interpreter}_nightly-${rvm_ruby_version}"
          rvm_ruby_package_file="MacRuby%200.5%20beta%201.zip"
          rvm_url="http://www.macruby.org/files/MacRuby%200.5%20beta%201.zip"
          rvm_ruby_string="${rvm_ruby_interpreter}-${rvm_ruby_version}"
        fi

        unset rvm_ruby_patch_level
      else
        __rvm_log "fail" "MacRuby can only be installed on a Darwin OS."
      fi
    ;;

    rbx|rubinius)
      rvm_ruby_interpreter="rbx"
      rvm_ruby_version="${rvm_ruby_version:-head}"
      unset rvm_ruby_patch_level
      rvm_ruby_repo_url=${rvm_rbx_repo_url:-"$(__rvm_db "rubinius_repo_url")"}
      rvm_ruby_string="rbx-head" # for now :)
      rvm_url=$rvm_ruby_repo_url
      rvm_ruby_configure=""
      rvm_ruby_make="build"
      rvm_ruby_make_install=""
    ;;

    jruby)
      unset rvm_ruby_patch_level
      if [[ "$rvm_head_flag" -eq 1 ]] ; then
        rvm_ruby_version="head"
        rvm_ruby_string="jruby-head"
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-$(__rvm_db "jruby_repo_url")}"
        rvm_url="${rvm_ruby_repo_url:-$(__rvm_db "jruby_repo_url")}"
      else
        rvm_ruby_version="${rvm_ruby_version:-"$(__rvm_db "jruby_version")"}"
        rvm_package_file="${rvm_ruby_interpreter}-bin-${rvm_ruby_version}"
        rvm_ruby_string="${rvm_ruby_interpreter}-${rvm_ruby_version}"
        rvm_url="http://jruby.kenai.com/downloads/${rvm_ruby_version}/${rvm_package_file}.tar.gz"
      fi
      alias jruby_ng="jruby --ng"
      alias jruby_ng_server="jruby --ng-server"
    ;;

    ree)
      rvm_ruby_interpreter=ree
      rvm_ruby_version=${rvm_ruby_version:-"$(__rvm_db "ree_version")"}
      if [[ ! -z "$rvm_ruby_patch_level" ]] ; then
        rvm_ruby_patch_level="$(echo $rvm_ruby_patch_level | sed 's#^p##')"
        rvm_ruby_string="${rvm_ruby_interpreter}-${rvm_ruby_version}-${rvm_ruby_patch_level}"
      elif [[ "$rvm_head_flag" = 1 ]] ; then
        rvm_ruby_string="${rvm_ruby_interpreter}-${rvm_ruby_version}-head"
      fi

      if [[ "$rvm_ruby_version" != "head" ]]  ; then
        if [[ ! -z "$rvm_ruby_revision" ]] ; then
          unset rvm_ruby_patch_level rvm_ruby_package_file
          rvm_ruby_package_name="ree-$rvm_ruby_version-$rvm_ruby_revision"
        else
          rvm_ruby_package_file="ruby-enterprise-$rvm_ruby_version-$rvm_ruby_patch_level"
          rvm_url="${rvm_url:-$(__rvm_db "${rvm_ruby_interpreter}_${rvm_ruby_version}_url")}/$rvm_ruby_package_file.tar.gz"
        fi
      fi

      if ! match "$rvm_ruby_version" "^1\.8" ; then
        __rvm_log "fail" "Unknown Ruby Enterprise Edition version: $rvm_ruby_version"
      fi
    ;;

    mput|shyouhei)
      rvm_ruby_interpreter="mput"
      rvm_ruby_version="head"
      rvm_ruby_string="mput-head"
      unset rvm_ruby_patch_level
      rvm_ruby_repo_url=${rvm_mput_repo_url:-"$(__rvm_db "shyouhei_repo_url")"}
      rvm_url=$rvm_ruby_repo_url
      unset rvm_ruby_configure rvm_ruby_make rvm_ruby_make_install
    ;;

    ruby)
      rvm_ruby_repo_url="${rvm_ruby_repo_url:-"$(__rvm_db "ruby_repo_url")"}"
      if [[ -z "$rvm_ruby_version" ]] ; then __rvm_log "fail" "Unknown ruby version: $rvm_ruby_version" ; fi
    ;;

    current)
      ruby_binary="$(which binary)"
      if match "$ruby_binary" "rvm" ; then
        rvm_ruby_string="$(dirname "$ruby_binary" | xargs dirname | xargs basename)"
      else
        rvm_ruby_interpreter="system"
      fi
    ;;

    default|system|user)
      #no-op?
    ;;

    *)
      if [[ ! -z "$MY_RUBY_HOME" ]] ; then
        rvm_ruby_string=$(basename $MY_RUBY_HOME)
        __rvm_select
      else
        if [[ -z "$rvm_ruby_string" ]] ; then
          __rvm_log "fail" "Ruby implementation '$rvm_ruby_interpreter' is not known."
        fi
      fi
  esac

  __rvm_gems_select

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

    rvm_ruby_package_name="$rvm_ruby_string"
    rvm_ruby_home="$rvm_path/$rvm_ruby_string"
    rvm_ruby_log_path="$rvm_log_path/$rvm_ruby_string"
    rvm_ruby_src_path="$rvm_src_path/$rvm_ruby_string"
    rvm_ruby_binary="$rvm_ruby_home/bin/ruby"
    rvm_ruby_irbrc="$rvm_ruby_home/.irbrc"
    if [[ -z "$rvm_gem_set_name" ]] ; then
      rvm_ruby_gem_home="${rvm_gem_path}/${rvm_ruby_interpreter}/${rvm_ruby_version}"
    else
      rvm_ruby_gem_home="${rvm_gem_path}/${rvm_ruby_interpreter}/${rvm_ruby_version}%${rvm_gem_set_name}"
    fi

    rvm_ruby_selected_flag=1

    export rvm_ruby_interpreter rvm_ruby_version rvm_ruby_repo_url rvm_ruby_package_name rvm_url rvm_ruby_patch_level rvm_ruby_configure rvm_ruby_make rvm_ruby_make_install rvm_ruby_revision rvm_ruby_tag rvm_major_version rvm_minor_version rvm_gem_set_name rvm_gem_path rvm_ruby_gem_home rvm_path rvm_src_path rvm_bin_path rvm_ruby_binary rvm_ruby_home rvm_log_path rvm_ruby_log_path rvm_src_path rvm_ruby_src_path rvm_ruby_irbrc rvm_ruby_selected_flag rvm_ruby_string
  else
    __rvm_unset_ruby_variables
    rvm_ruby_interpreter="system"
  fi
}

function __rvm_use {
  if [[ -z "$rvm_ruby_selected_flag" ]] ; then __rvm_select $* ; fi
  if [[ -z "$rvm_ruby_interpreter" ]] ; then rvm_ruby_interpreter="default" ; fi

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

    PATH=$(echo $PATH | tr ':' '\n' | awk '$0 !~ /rvm/' | paste -sd : -)
    PATH=$rvm_bin_path:$PATH ; export PATH

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

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

    unset GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC
    PATH=$(echo $PATH | tr ':' '\n' | awk '$0 !~ /rvm/' | paste -sd : -)
    PATH=$rvm_bin_path:$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=$rvm_ruby_gem_home ; export GEM_HOME
    GEM_PATH=$rvm_ruby_gem_home ; export GEM_PATH
    MY_RUBY_HOME=$rvm_ruby_home ; export MY_RUBY_HOME
    RUBY_VERSION=$rvm_ruby_string ; export RUBY_VERSION
    IRBRC="$rvm_ruby_irbrc" ; export IRBRC
    if [[ -z "$IRBRC" ]] ; then unset IRBRC ; fi

    if [[ ! -d $MY_RUBY_HOME ]] ; then
      __rvm_log "warn" "$rvm_ruby_interpreter $rvm_ruby_string is not installed.\nTo install do: 'rvm install $rvm_ruby_string'"
      if [[ ! -z "$rvm_install_on_use_flag" ]] ; then
        __rvm_install_ruby $rvm_ruby_interpreter $rvm_ruby_version $rvm_ruby_patch_level
      fi
    fi

    __rvm_irbrc

    PATH=$(echo $PATH | tr ':' '\n' | awk '$0 !~ /rvm/' | paste -sd : -)
    PATH=$rvm_bin_path:$PATH ; export PATH
    PATH=$MY_RUBY_HOME/bin:$GEM_HOME/bin:$rvm_path/bin:$PATH ; export PATH

  fi

  if [[ ! -z "$rvm_default_flag" ]] && [[ "default" != "$rvm_ruby_interpreter" ]] ; then
    if [[ "system" = "$rvm_ruby_interpreter" ]] ; then
      rm -f $rvm_path/default
      rm -f $rvm_path/bin/default*
    else
      RUBY_VERSION="$($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 "$value" ]] ; then
          echo "${variable}='$value' ; export ${variable}" >> $rvm_path/default
        else
          echo "unset ${variable}" >> $rvm_path/default
        fi
      done ; unset variable value

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

  if [[ ! -z "$rvm_load_flag" ]] ; then __rvm_gems_load ; fi
  if [[ ! -z "$rvm_dump_flag" ]] ; then __rvm_gems_dump ; fi
}

__rvm_ruby_string() {
  # rvm_ruby_string may designate any of the following items:
  # * rvm_gem_set_name
  # * rvm_ruby_interpreter
  # * rvm_ruby_version
  # * rvm_ruby_patch_level
  # * rvm_ruby_revision
  # * rvm_ruby_tag

  set_name=$(echo "$rvm_ruby_string" | awk -F'%' '{print $2}')
  if [[ ! -z "$set_name" ]] ; then rvm_gem_set_name="$set_name" ; fi
  ruby_string=$(echo "$rvm_ruby_string" | awk -F'%' '{print $1}')

  __rvm_unset_ruby_variables

  for string in $(echo $ruby_string | tr '-' ' ') ; do
    if [[ "head" = "$string" ]] ; then
      rvm_ruby_revision="head"
      unset rvm_ruby_patch_level rvm_ruby_revision rvm_ruby_tag
      rvm_head_flag=1
    elif [[ "default" = "$string" ]] ; then
      rvm_ruby_interpreter="default"
      break
    elif [[ "system" = "$string" ]] ; then
      rvm_ruby_interpreter="system"
      break
    elif [[ "nightly" = "$string" ]] ; then
      rvm_ruby_version="nightly"
      rvm_nightly_flag=1
      break
    elif match "$string" "^preview" ; then
      rvm_ruby_patch_level="$string"
    elif match "$string" "^[a-z][a-z]" ; then
      rvm_ruby_interpreter="$string"
    elif match "$string" "^[0-9]\.[0-9]" ; then
      if [[ "1.8" = "$string" ]] ; then string="1.8.6" ; fi
      if [[ "1.9" = "$string" ]] ; then string="1.9.1" ; fi
      rvm_ruby_version="$string"
      unset rvm_ruby_revision rvm_ruby_tag
    elif match "$string" "^p[0-9]" ; then
      rvm_ruby_patch_level="$string"
    elif match "$string" "^[0-9][0-9]" ; then
      if [[ "ree" = "$rvm_ruby_interpreter" ]] ; then
        rvm_ruby_patch_level="$string"
        unset rvm_ruby_revision
      else
        rvm_ruby_revision="r$string"
      fi
    elif match "$string" "^r[0-9]" ; then
      unset rvm_ruby_patch_level
      rvm_ruby_revision="$string"
    elif match "$string" "^s[0-9]" ; then
      unset rvm_ruby_revision
      rvm_ruby_sha="$string"
    elif match "$string" "^t[0-9]" ; then
      unset rvm_ruby_patch_level rvm_ruby_revision
      rvm_ruby_tag="$string"
    else
      __rvm_log "error" "Unknown ruby string component: '$string'"
    fi
  done

  # Unspecified interpreter
  if [[ -z "$rvm_ruby_interpreter" ]] ; then
    if match "$rvm_ruby_version" "^1\.[8-9]" ; then
      rvm_ruby_interpreter="ruby"
    elif match "$rvm_ruby_version" "^0.5" ; then
      rvm_ruby_interpreter="macruby"
    elif match "$rvm_ruby_version" "^1.[2-4]" ; then
      rvm_ruby_interpreter="jruby"
    fi
  fi

  # Unspecified version
  if [[ -z "$rvm_ruby_version" ]] ; then
    rvm_ruby_version=${rvm_ruby_version:-"$(__rvm_db "${rvm_ruby_interpreter}_version")"}
  fi
  rvm_ruby_string="${rvm_ruby_interpreter}-${rvm_ruby_version}"

  # Unspecified patch level
  if [[ "$rvm_head_flag" -eq 1 ]] ; then
    rvm_ruby_string="${rvm_ruby_string}-head"
  elif [[ ! -z "$rvm_ruby_revision" ]]  ; then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_revision}"
  elif [[ ! -z "$rvm_ruby_tag" ]]  ; then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_tag}"
  elif [[ ! -z "$rvm_ruby_patch_level" ]]  ; then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_patch_level}"
  else
    patch_level="$(__rvm_db "${rvm_ruby_interpreter}_${rvm_ruby_version}_patch_level")"
    if [[ ! -z "$patch_level" ]] ; then rvm_ruby_patch_level="p${patch_level}" ; fi
    if [[ ! -z "$rvm_ruby_patch_level" ]] ; then
      rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_patch_level}"
    fi
  fi
}