class Pa
  module State
    extend Util::Concern

    FILE_DELEGATED_METHODS = [ :exists?, :atime, :ctime, :mtime, :stat, :lstat, :size, :zero?, :executable?, :executable_real?, :world_executable?, :readable?, :readable_real?, :world_readalbe?, :writeable?, :writeable_real?, :world_writeable?, :directory?, :file?, :blockdev?, :chardev?, :piple?, :socket?, :symlink?, :owned?, :grpowned?, :setgid?, :setuid?, :stricky?, :identical? ]

    module ClassMethods
      # delegated from File
      FILE_DELEGATED_METHODS.each { |name|
        module_eval <<-METHOD, __FILE__, __LINE__
          def #{name}(*args)
            File.#{name}(*args)
          end
        METHOD
      }

      # @see File.chmod
      def chmod(mode, *paths)
        paths.map!{|v|get(v)}
        File.chmod(mode, *paths) 
      end

      # @see File.lchmod
      def lchmod(mode, *paths)
        paths.map!{|v|get(v)}
        File.lchmod(mode, *paths) 
      end

      # @see File.chown
      def chown(user, group=nil, *paths)
        paths.map!{|v|get(v)}
        File.chown(user, group, *paths) 
      end

      # @see File.lchown
      def lchown(user, group=nil, *paths)
        paths.map!{|v|get(v)}
        File.lchown(user, group, *paths) 
      end

      # @see File.utime
      def utime(atime, mtime, *paths)
        paths.map!{|v|get(v)}
        File.utime(atime, mtime, *paths) 
      end

      # get file type
      #
      # file types:
      #   "chardev" "blockdev" "symlink" ..
      #
      # @param [String] path
      # @return [String] 
      def type(path)
        case (t=File.ftype(get(path)))
        when "characterSpecial"
          "chardev"
        when "blockSpecial"
          "blockdev"
        when "link"
          "symlink"
        else
          t
        end
      end # def type

      # is path a mountpoint?
      #
      # @param[String] path
      # @return [Boolean]
      def mountpoint?(path)
        path=get(path)
        begin
          stat1 = File.lstat(path)
          stat2 = File.lstat(File.join(path, '..'))
          stat1.dev == stat2.dev && stat1.ino == stat2.ino || stat1.dev != stat2.dev
        rescue Errno::ENOENT
          false
        end
      end
    end

    # delegated from File
    FILE_DELEGATED_METHODS.each { |name|
      module_eval <<-METHOD, __FILE__, __LINE__
        def #{name}(*args)
          File.#{name}(*args, path)
        end
      METHOD
    }

    def chmod(mode)
      File.chmod(mode, path) 
    end

    def lchmod(mode)
      File.lchmod(mode, path) 
    end

    def chown(uid, gid=nil)
      File.chown(uid, gid, path) 
    end

    def lchown(uid, gid=nil)
      File.lchown(uid, gid, path) 
    end

    def utime(atime, mtime)
      File.utime(atime, mtime, path) 
    end
  end
end