#!/bin/bash

__rvm_gems() {
  unset GEM_PATH
  if [ -z "$rvm_ruby_selected_flag" ] ; then __rvm_select $* ; fi

  if [ ! -z "$rvm_use_flag" ] ; then
    __rvm_gems_use
  elif [ ! -z "$rvm_load_flag" ] ; then
    __rvm_gems_load
  elif [ ! -z "$rvm_dump_flag" ] ; then
    __rvm_gems_dump
  elif [ ! -z "$rvm_delete_flag" ] ; then
    __rvm_gems_delete
  elif [ ! -z "$rvm_name_flag" ] ; then
    __rvm_gems_name
  elif [ ! -z "$rvm_dir_flag" ] ; then
    __rvm_gems_dir
  elif [ ! -z "$rvm_list_flag" ] ; then
    __rvm_gems_list
  elif [ ! -z "$rvm_clear_flag" ] ; then
    __rvm_gems_clear
  fi
}

__rvm_gems_select() {
  if [ -z "$rvm_gem_set_name" ] ; then
    if [ ! -z "$GEM_HOME" ] ; then
      rvm_gem_set_name=$(echo $GEM_HOME | xargs basename | awk -F'%' '{print $2}')
    fi

    if [ ! -z "$rvm_ruby_gem_home" ] ; then
      rvm_gem_set_name=$(echo $rvm_ruby_gem_home | xargs basename | awk -F'%' '{print $2}')
    fi

    if [ ! -z "$rvm_gem_set_name" ] && [[ ! "$rvm_gem_set_name" =~ ^\d\.\d ]] ; then
      rvm_ruby_gem_home="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version%$rvm_gem_set_name"
    else
      if [ ! -z "$rvm_ruby_interpreter" -a ! -z "$rvm_ruby_version" -a "$rvm_ruby_interpreter" != "system" ] ; then
        rvm_ruby_gem_home="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version"
      elif [ -z "$GEM_HOME" ] ; then
        rvm_ruby_gem_home=$(gem env gemdir)
      elif [ ! -z "$GEM_HOME" ] ; then
        rvm_ruby_gem_home="$GEM_HOME"
      else
        __rvm_log "error" "Cannot select gem home, something definitely wrong :/"
      fi
    fi
    if [ -z "$rvm_gem_set_name" ] ; then unset rvm_gem_set_name ; fi
  else
    rvm_ruby_gem_home="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version%$rvm_gem_set_name"
  fi
}

__rvm_gems_use() {
  mkdir -p "$rvm_ruby_gem_home" ; GEM_HOME="$rvm_ruby_gem_home" ; export GEM_HOME
}

__rvm_gems_name() {
  echo "$rvm_gem_set_name"
}

__rvm_gems_dir() {
  echo "$rvm_ruby_gem_home"
}

__rvm_gems_list() {
  for gemdir in "$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version%"* ; do
    echo "$gemdir" | awk -F'%' '{print $2}'
  done
}

__rvm_gems_clear() {
  __rvm_gems_use
  if [ -d "$rvm_ruby_gem_home" -a "$rvm_ruby_gem_home" != '/' ] ; then
    rm -rf "$rvm_ruby_gem_home"
  fi
}

__rvm_gems_dump() {
  if [ ! -z "$rvm_ruby_gem_home" ] ; then
    GEM_HOME="$rvm_ruby_gem_home" ; export GEM_HOME ;
    GEM_PATH="$rvm_ruby_gem_home" ; export GEM_PATH ;
  fi

  if [ -z "$rvm_file_name" ] ; then
    if [ ! -z "$rvm_gem_set_name" ] ; then
      rvm_file_name="$rvm_gem_set_name.gems"
    else
      rvm_file_name="default.gems"
    fi
  fi

  touch $rvm_file_name
  echo "# $rvm_file_name generated gem dump file. Note that any env variable settings will be missing. Append these after using a ';' field separator" > $rvm_file_name

  for gem in $(gem list | sed 's/[\(|\)]//g' | sed 's/, /,/g' | tr ' ' ';') ; do
    name="$(echo $gem | awk -F';' '{print $1}')"
    if [ -z "$rvm_latest_flag" ] ; then
      versions="$(echo $gem | awk -F';' '{print $2}' | sed 's/,/ /g')"
      for version in $versions ; do
        echo "$name -v$version" >> $rvm_file_name
      done ; unset version versions
    else
      echo "$name" >> $rvm_file_name
    fi ; unset name
  done ; unset file_name
}

__rvm_gems_load() {
  if [ ! -z "$rvm_ruby_gem_home" ] ; then
    GEM_HOME="$rvm_ruby_gem_home" ; export GEM_HOME ;
    GEM_PATH="$rvm_ruby_gem_home" ; export GEM_PATH ;
  fi

  if [ -z "$rvm_file_name" ] ; then
    if [ -f "$rvm_gem_set_name.gems" ] ; then
      rvm_file_name="$rvm_gem_set_name.gems"
    elif [ -f "default.gems" ] ; then
      rvm_file_name="default.gems"
    elif [ -f "system.gems" ] ; then
      rvm_file_name="system.gems"
    fi
  fi

  if [ -f "$rvm_file_name" ] ; then
    echo "Loading $rvm_file_name file..."
    rvm_ruby_gem_list=$(/bin/ls $rvm_ruby_gem_home/specifications/ 2> /dev/null | sed 's/\.gemspec$//' 2> /dev/null)
    while read line
    do # Keep this on 2nd line :( bash fail.
      # TODO: Switch to a different field separator than ; to allow for evals
      gem="$(echo $line | awk -F';' '{print $1}')"
      gem_prefix="$(echo $line | awk -F';' '{print $2}')"
      gem_name="$(echo $gem | awk '{print $1}')"
      gem_version="$(echo $gem | sed 's/^.*-v[=]*[ ]*//' | awk '{print $1}')"
      gem_postfix="$(echo $gem | sed "s/$gem_name//" | sed "s/-v[=]*[ ]*$gem_version//")"

      if [ -f "$gem" ] ; then
        gem_file_name="${gem}"
      elif [[ "$gem" =~ ".gem$" ]] ; then
        gem_file_name="${gem}"
      elif [ -z "$gem_version" ] ; then # no version
        gem_file_name="${gem_name}*.gem"
      else # version
        gem_file_name="$gem_name-$gem_version.gem"
      fi

      cache_file=$(/bin/ls -t "$rvm_gem_path/*/*/cache/${gem_file_name}*" 2> /dev/null | head -n1)
      if [ -z "$cache_file" ] ; then
        if [ -f "$gem_file_name" ] ; then
          gem="$gem_file_name"
        elif [ -z "$gem_version" ] ; then
          gem="$gem_name"
        else
          gem="$gem_name -v $gem_version"
        fi
      else # cached
        gem_file_name="$(basename $cache_file)"
        gem_string="$(echo "$gem_file_name" | sed 's/\.gem$//')"
        if [ ! -z "$(echo "$rvm_ruby_gem_list" | awk "/$gem_string/{print}")" ] ; then
        #if [[ $rvm_ruby_gem_list =~ $gem_string ]] ; then
          if [ ! -z "$rvm_force_flag" ] ; then
            cp $cache_file $rvm_temp_path/$gem_file_name
            gem="$rvm_temp_path/$gem_file_name" # install as a named local gem
          else
            unset gem
            __rvm_log "info" "$gem_name $gem_version is already installed, skipping. (use --force to force these to install regardless)"
          fi
        else
          gem="$cache_file"
        fi
      fi

      if [ ! -z "$gem" ] ; then
        # TODO: Set vars if fourth field is non-empty (means that there are conditional statements to execute in the gem install line.
        if [ -z "$vars" ] ; then
          GEM_HOME="$rvm_ruby_gem_home" GEM_PATH="$rvm_ruby_gem_home" $gem_prefix $rvm_ruby_home/bin/gem install --no-rdoc --no-ri -q $gem $gem_postfix
        else
          eval "GEM_HOME='$rvm_ruby_gem_home' GEM_PATH='$rvm_ruby_gem_home' $gem_prefix $rvm_ruby_home/bin/gem install --no-rdoc --no-ri -q $gem $gem_postfix"
        fi
      fi
      unset gem gem_prefix gem_name gem_version gem_file_name gem_postfix cache_file gem_file_name gem_string
    done < <(awk '/^[\.\/a-zA-Z]/{print}' "$rvm_file_name")
  else
    __rvm_log "error" "$rvm_file_name does not exist to load from."
  fi
}

__rvm_gems_delete () {
  if [ ! -z "$rvm_gem_set_name" ] ; then
    gemdir="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version%$rvm_gem_set_name"
    if [ -d "$gemdir" -a ! -z "$rvm_force_flag" ] ; then
        rm -rf  "$gemdir"
    elif [ -d "$gemdir" ] ; then
      __rvm_log "warn" "Are you SURE you wish to remove the installed gems '$rvm_gem_set_name ' ($gemdir)?"
      echo -n "(anything other than 'yes' will cancel) > "
      read response
      if [ "yes" = "$response" ] ; then
        rm -rf  "$gemdir"
      else
        __rvm_log "info" "Not doing anything, phew... close call that one eh?"
      fi
    else
      __rvm_log "info" "$gemdir already does not exist."
    fi ; unset gemdir
  else
    __rvm_log "error" "A gems name must be specified in order to delete a gems."
  fi
}