module MPatch
  module File

    # create a file, if not exsist create file, and dir if needed
    def self.create(route_name ,filemod="w",string_data= ::String.new )

      #file_name generate
      if !route_name.to_s.split(self.class::SEPARATOR).last.nil? || route_name.to_s.split(self.class::SEPARATOR).last != ''
        file_name = route_name.to_s.split(self.class::SEPARATOR).last
      else
        file_name = nil?
      end

      #path_way
      begin
        raise ::ArgumentError, "missing route_name: #{route_name}"   if route_name.nil?
        path = self.class.expand_path(route_name).to_s.split(self.class::SEPARATOR)
        path = path - [self.class.expand_path(route_name).to_s.split(self.class::SEPARATOR).last]
        path.shift
      end

      #job
      begin
        if !::Dir.exists?(self.class::SEPARATOR+path.join(self.class::SEPARATOR))

          at_now = self.class::SEPARATOR
          path.each do |dir_to_be_checked|

            at_now += "#{dir_to_be_checked+self.class::SEPARATOR}"
            ::Dir.mkdir(at_now) if !::Dir.exists?(at_now)

          end
        end
      end

      # write data
      begin
        full_path = "#{self.class::SEPARATOR+path.join(self.class::SEPARATOR)+self.class::SEPARATOR}#{file_name}"
        if self.class.exist? full_path
          self.class.open(full_path,filemod).write string_data
        else
          self.class.new(full_path,filemod).write string_data
        end
      end

    end

    # start read the file object on each line
    # optionable an integer value to start read line at
    # compatible with mac (i am linux user, so not tested)
    def each_line_from(start_at=1,&block)
      unless [::Integer,Fixnum,Bignum].include?(start_at.class)
        raise ::ArgumentError, "invalid line index"
      end
      begin
        line_num= 1
        text= self.read
        text.gsub!(/\r\n?/, "\n")
        text.each_line do |*line|
          if line_num >= start_at
            block.call #*line
          end
          line_num += 1
        end
      end
    end

  end
end