class Bundler::Runtime

def cache
  FileUtils.mkdir_p(cache_path) unless File.exists?(cache_path)
  Bundler.ui.info "Updating .gem files in vendor/cache"
  specs.each do |spec|
    next if spec.name == 'bundler'
    spec.source.cache(spec) if spec.source.respond_to?(:cache)
  end
  prune_cache unless Bundler.settings[:no_prune]
end

def cache_path
  root.join("vendor/cache")
end

def clean
  gem_bins             = Dir["#{Gem.dir}/bin/*"]
  git_dirs             = Dir["#{Gem.dir}/bundler/gems/*"]
  git_cache_dirs       = Dir["#{Gem.dir}/cache/bundler/git/*"]
  gem_dirs             = Dir["#{Gem.dir}/gems/*"]
  gem_files            = Dir["#{Gem.dir}/cache/*.gem"]
  gemspec_files        = Dir["#{Gem.dir}/specifications/*.gemspec"]
  spec_gem_paths       = []
  spec_git_paths       = []
  spec_git_cache_dirs  = []
  spec_gem_executables = []
  spec_cache_paths     = []
  spec_gemspec_paths   = []
  specs.each do |spec|
    spec_gem_paths << spec.full_gem_path
    # need to check here in case gems are nested like for the rails git repo
    md = %r{(.+bundler/gems/.+-[a-f0-9]{12})}.match(spec.full_gem_path)
    spec_git_paths << md[1] if md
    spec_gem_executables << spec.executables.collect do |executable|
      "#{Gem.dir}/#{spec.bindir}/#{executable}"
    end
    spec_cache_paths << spec.cache_file
    spec_gemspec_paths << spec.spec_file
    spec_git_cache_dirs << spec.source.cache_path.to_s if spec.source.is_a?(Bundler::Source::Git)
  end
  spec_gem_paths.uniq!
  spec_gem_executables.flatten!
  stale_gem_bins       = gem_bins - spec_gem_executables
  stale_git_dirs       = git_dirs - spec_git_paths
  stale_git_cache_dirs = git_cache_dirs - spec_git_cache_dirs
  stale_gem_dirs       = gem_dirs - spec_gem_paths
  stale_gem_files      = gem_files - spec_cache_paths
  stale_gemspec_files  = gemspec_files - spec_gemspec_paths
  stale_gem_bins.each {|bin| FileUtils.rm(bin) }
  output = stale_gem_dirs.collect do |gem_dir|
    full_name = Pathname.new(gem_dir).basename.to_s
    FileUtils.rm_rf(gem_dir)
    parts   = full_name.split('-')
    name    = parts[0..-2].join('-')
    version = parts.last
    output  = "#{name} (#{version})"
    Bundler.ui.info "Removing #{output}"
    output
  end + stale_git_dirs.collect do |gem_dir|
    full_name = Pathname.new(gem_dir).basename.to_s
    FileUtils.rm_rf(gem_dir)
    parts    = full_name.split('-')
    name     = parts[0..-3].join('-')
    revision = parts[-1]
    version  = parts[-2]
    output   = "#{name} (#{version} #{revision})"
    Bundler.ui.info "Removing #{output}"
    output
  end
  stale_gem_files.each {|file| FileUtils.rm(file) if File.exists?(file) }
  stale_gemspec_files.each {|file| FileUtils.rm(file) if File.exists?(file) }
  stale_git_cache_dirs.each {|dir| FileUtils.rm_rf(dir) if File.exists?(dir) }
  output
end

def dependencies_for(*groups)
  if groups.empty?
    dependencies
  else
    dependencies.select { |d| (groups & d.groups).any? }
  end
end

def prune_cache
  FileUtils.mkdir_p(cache_path) unless File.exists?(cache_path)
  resolve = @definition.resolve
  cached  = Dir["#{cache_path}/*.gem"]
  cached = cached.delete_if do |path|
    spec = Bundler.rubygems.spec_from_gem path
    resolve.any? do |s|
      s.name == spec.name && s.version == spec.version && !s.source.is_a?(Bundler::Source::Git)
    end
  end
  if cached.any?
    Bundler.ui.info "Removing outdated .gem files from vendor/cache"
    cached.each do |path|
      Bundler.ui.info "  * #{File.basename(path)}"
      File.delete(path)
    end
  end
end

def require(*groups)
  groups.map! { |g| g.to_sym }
  groups = [:default] if groups.empty?
  @definition.dependencies.each do |dep|
    # Skip the dependency if it is not in any of the requested
    # groups
    next unless ((dep.groups & groups).any? && dep.current_platform?)
    required_file = nil
    begin
      # Loop through all the specified autorequires for the
      # dependency. If there are none, use the dependency's name
      # as the autorequire.
      Array(dep.autorequire || dep.name).each do |file|
        required_file = file
        Kernel.require file
      end
    rescue LoadError => e
      REGEXPS.find { |r| r =~ e.message }
      if dep.name.include?('-')
        begin
          namespaced_file = dep.name.gsub('-', '/')
          Kernel.require namespaced_file
        rescue LoadError
          REGEXPS.find { |r| r =~ e.message }
          raise if dep.autorequire || $1.gsub('-', '/') != namespaced_file
        end
      else
        raise if dep.autorequire || $1 != required_file
      end
    end
  end
end

def setup(*groups)
  # Has to happen first
  clean_load_path
  specs = groups.any? ? @definition.specs_for(groups) : requested_specs
  setup_environment
  Bundler.rubygems.replace_entrypoints(specs)
  # Activate the specs
  specs.each do |spec|
    unless spec.loaded_from
      raise GemNotFound, "#{spec.full_name} is missing. Run `bundle` to get it."
    end
    if activated_spec = Bundler.rubygems.loaded_specs(spec.name) and activated_spec.version != spec.version
      e = Gem::LoadError.new "You have already activated #{activated_spec.name} #{activated_spec.version}, " \
                             "but your Gemfile requires #{spec.name} #{spec.version}. Using bundle exec may solve this."
      e.name = spec.name
      if e.respond_to?(:requirement=)
        e.requirement = Gem::Requirement.new(spec.version.to_s)
      else
        e.version_requirement = Gem::Requirement.new(spec.version.to_s)
      end
      raise e
    end
    Bundler.rubygems.mark_loaded(spec)
    load_paths = spec.load_paths.reject {|path| $LOAD_PATH.include?(path)}
    $LOAD_PATH.unshift(*load_paths)
  end
  lock
  self
end

def setup_environment
  begin
    ENV["BUNDLE_BIN_PATH"] = Bundler.rubygems.bin_path("bundler", "bundle", VERSION)
  rescue Gem::GemNotFoundException
    ENV["BUNDLE_BIN_PATH"] = File.expand_path("../../../bin/bundle", __FILE__)
  end
  # Set PATH
  paths = (ENV["PATH"] || "").split(File::PATH_SEPARATOR)
  paths.unshift "#{Bundler.bundle_path}/bin"
  ENV["PATH"] = paths.uniq.join(File::PATH_SEPARATOR)
  # Set BUNDLE_GEMFILE
  ENV["BUNDLE_GEMFILE"] = default_gemfile.to_s
  # Set RUBYOPT
  rubyopt = [ENV["RUBYOPT"]].compact
  if rubyopt.empty? || rubyopt.first !~ /-rbundler\/setup/
    rubyopt.unshift "-rbundler/setup"
    rubyopt.unshift "-I#{File.expand_path('../..', __FILE__)}"
    ENV["RUBYOPT"] = rubyopt.join(' ')
  end
end