class Bundler::Resolver::SpecGroup

def __dependencies
  @dependencies ||= begin
    dependencies = {}
    ALL.each do |p|
      next unless spec = @specs[p]
      dependencies[p] = []
      spec.dependencies.each do |dep|
        next if dep.type == :development
        dependencies[p] << DepProxy.new(dep, p)
      end
    end
    dependencies
  end
end

def activate_platform(platform)
  unless @activated.include?(platform)
    if for?(platform, nil)
      @activated << platform
      return __dependencies[platform] || []
    end
  end
  []
end

def dependencies_for_activated_platforms
  @activated.map {|p| __dependencies[p] }.flatten
end

def for?(platform, required_ruby_version)
  if spec = @specs[platform]
    if required_ruby_version && spec.respond_to?(:required_ruby_version) && spec_required_ruby_version = spec.required_ruby_version
      spec_required_ruby_version.satisfied_by?(required_ruby_version.gem_version)
    else
      true
    end
  end
end

def initialize(a)
  super
  @required_by  = []
  @activated    = []
  @dependencies = nil
  @specs        = {}
  ALL.each do |p|
    @specs[p] = reverse.find {|s| s.match_platform(p) }
  end
end

def initialize_copy(o)
  super
  @required_by = o.required_by.dup
  @activated   = o.activated.dup
end

def name
  @name ||= first.name
end

def platforms_for_dependency_named(dependency)
  __dependencies.select {|_, deps| deps.map(&:name).include? dependency }.keys
end

def source
  @source ||= first.source
end

def to_s
  "#{name} (#{version})"
end

def to_specs
  specs = {}
  @activated.each do |p|
    next unless s = @specs[p]
    platform = generic(Gem::Platform.new(s.platform))
    next if specs[platform]
    lazy_spec = LazySpecification.new(name, version, platform, source)
    lazy_spec.dependencies.replace s.dependencies
    specs[platform] = lazy_spec
  end
  specs.values
end

def version
  @version ||= first.version
end