#
# Author:: Kaustubh Deorukhkar (kaustubh@clogeny.com)
# Copyright:: Copyright 2013-2016, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require_relative "../ifconfig"

class Chef
  class Provider
    class Ifconfig
      class Aix < Chef::Provider::Ifconfig
        provides :ifconfig, platform: "aix"

        def load_current_resource
          @current_resource = Chef::Resource::Ifconfig.new(new_resource.name)

          @interface_exists = false
          found_interface = false
          interface = {}

          @status = shell_out("ifconfig", "-a")
          @status.stdout.each_line do |line|
            if !found_interface
              if line =~ /^(\S+):\sflags=(\S+)/
                # We have interface name, if this is the interface for current_resource, load info else skip till next interface is found.
                if Regexp.last_match(1) == new_resource.device
                  # Found interface
                  found_interface = true
                  @interface_exists = true
                  current_resource.target(new_resource.target)
                  current_resource.device(Regexp.last_match(1))
                  interface[:flags] = Regexp.last_match(2)
                  current_resource.metric(Regexp.last_match(1)) if line =~ /metric\s(\S+)/
                end
              end
            elsif line =~ /^(\S+):\sflags=(\S+)/
              # we are done parsing interface info and hit another one, so stop.
              found_interface = false
              break
            elsif found_interface
              # read up interface info
              current_resource.inet_addr(Regexp.last_match(1)) if line =~ /inet\s(\S+)\s/
              current_resource.bcast(Regexp.last_match(1)) if line =~ /broadcast\s(\S+)/
              current_resource.mask(hex_to_dec_netmask(Regexp.last_match(1))) if line =~ /netmask\s(\S+)\s/
            end
          end

          current_resource
        end

        private

        def add_command
          # ifconfig changes are temporary, chdev persist across reboots.
          raise Chef::Exceptions::Ifconfig, "interface metric property cannot be set for :add action" if new_resource.metric

          command = [ "chdev", "-l", new_resource.device, "-a", "netaddr=#{new_resource.name}" ]
          command += [ "-a", "netmask=#{new_resource.mask}" ] if new_resource.mask
          command += [ "-a", "mtu=#{new_resource.mtu}" ] if new_resource.mtu
          command
        end

        def delete_command
          # ifconfig changes are temporary, chdev persist across reboots.
          [ "chdev", "-l", new_resource.device, "-a", "state=down" ]
        end

        def loopback_device
          "lo0"
        end

        def hex_to_dec_netmask(netmask)
          # example '0xffff0000' -> '255.255.0.0'
          dec = netmask[2..3].to_i(16).to_s(10)
          [4, 6, 8].each { |n| dec = dec + "." + netmask[n..n + 1].to_i(16).to_s(10) }
          dec
        end

      end
    end
  end
end
