module Net
  module IP
    # Parses routing table entries
    class RouteParser
      # Parse a routing table entry into a hash
      #
      # @param line {String}
      # @return {Hash}
      def self.parse_line(line)
        params = {}

        if line =~ /^(unicast|unreachable|blackhole|prohibit|local|broadcast|throw|nat|via|anycast|multicast)\s+/
          params[:type] = $1
          line = line[$1.length..-1]
        end

        params[:prefix] = line.split.first
        params[:dev] = $1 if line =~ /\s+dev\s+([^\s]+)/
        params[:scope] = $1 if line =~ /\s+scope\s+([^\s]+)/
        params[:metric] = $1 if line =~ /\s+metric\s+([^\s]+)/
        params[:proto] = $1 if line =~ /\s+proto\s+([^\s]+)/
        params[:src] = $1 if line =~ /\s+src\s+([^\s]+)/
        params[:via] = $1 if line =~ /\s+via\s+([^\s]+)/
        params[:weight] = $1 if line =~ /\s+weight\s+([^\s]+)/
        params[:table] = $1 if line =~ /\s+table\s+([^\s]+)/
        params[:error] = $1 if line =~ /\s+error\s+([^\s]+)/

        params
      end

      # Parse the output of ip route into an array of hashes
      #
      # @param data {String}
      # @return {Array}
      def self.parse(data)
        list = []
        in_default = false
        data.each_line do |line|
          if in_default == true
            if line.start_with? "\t"
              list << parse_line(line.strip.gsub("nexthop", "default"))
            else
              in_default = false
            end
          elsif line.strip == "default"
            in_default = true
          end

          unless in_default
            list << parse_line(line.strip)
          end
        end
        list
      end
    end
  end
end