#
#   Copyright 2011 Red Hat, Inc.
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#

require "bundler"

# some rubygems does not play well with daemonized processes ($HOME is empty)
ENV['HOME'] = ENV['BUNDLER_EXT_HOME'] if ENV['BUNDLER_EXT_HOME']

module  Aeolus
  module Ext
    class BundlerExt
      def self.parse_from_gemfile(gemfile,*groups)
        ENV['BUNDLE_GEMFILE'] = gemfile
        extra_groups = ENV['BUNDLER_EXT_GROUPS']
        extra_groups.split(/\s/).each {|g| groups << g.to_sym} if extra_groups
        all_groups = false
        all_groups = true if groups.size == 1 and groups.include?(:all) and not extra_groups
        groups.map! { |g| g.to_sym }
        g = Bundler::Dsl.evaluate(gemfile,'foo',true)
        list = []
        g.dependencies.each do |dep|
          if ((groups & dep.groups).any? || all_groups) && dep.current_platform?
            Array(dep.autorequire || dep.name).each do |file|
              list << file
            end
          end
        end
        list
      end

      def self.strict_error(msg)
        if ENV['BUNDLER_EXT_NOSTRICT']
          puts msg
        else
          raise msg
        end
      end

      def self.system_require(gemfile,*groups)
        BundlerExt.parse_from_gemfile(gemfile,*groups).each do |dep|
          #This part ripped wholesale from lib/bundler/runtime.rb (github/master)
          begin
            #puts "Attempting to require #{dep}"
            require dep
          rescue LoadError => e
            #puts "Caught error: #{e.message}"
            if dep.include?('-')
              begin
                if dep.respond_to? :name
                  namespaced_file = dep.name.gsub('-', '/')
                else
                  # try to load unresolved deps
                  namespaced_file = dep.gsub('-', '/')
                end
                #puts "Munged the name, now trying to require as #{namespaced_file}"
                require namespaced_file
              rescue LoadError => e2
                strict_error "Gem loading error: #{e2.message}"
              end
            else
              strict_error "Gem loading error: #{e.message}"
            end
          end
        end
      end

      def self.output
        ENV['BUNDLER_STDERR'] || $stderr
      end
    end
  end
end