#
# Author:: Xabier de Zuazo (xabier@onddo.com)
# Copyright:: Copyright 2013-2016, Onddo Labs, SL.
# 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"
require_relative "../../util/file_edit"

class Chef
  class Provider
    class Ifconfig
      class Debian < Chef::Provider::Ifconfig
        provides :ifconfig, platform_family: %w{debian}

        INTERFACES_FILE = "/etc/network/interfaces".freeze
        INTERFACES_DOT_D_DIR = "/etc/network/interfaces.d".freeze

        def initialize(new_resource, run_context)
          super(new_resource, run_context)
          @config_template = %{
<% if new_resource.device -%>
<% if new_resource.onboot == "yes" -%>
auto <%= new_resource.device %>
<% end -%>
<% case new_resource.bootproto
   when "dhcp" -%>
iface <%= new_resource.device %> <%= new_resource.family %> dhcp
<% when "bootp" -%>
iface <%= new_resource.device %> <%= new_resource.family %> bootp
<% else -%>
iface <%= new_resource.device %> <%= new_resource.family %> static
    <% if new_resource.target -%>
    address <%= new_resource.target %>
    <% end -%>
    <% if new_resource.mask -%>
    netmask <%= new_resource.mask %>
    <% end -%>
    <% if new_resource.network -%>
    network <%= new_resource.network %>
    <% end -%>
    <% if new_resource.bcast -%>
    broadcast <%= new_resource.bcast %>
    <% end -%>
    <% if new_resource.metric -%>
    metric <%= new_resource.metric %>
    <% end -%>
    <% if new_resource.hwaddr -%>
    hwaddress <%= new_resource.hwaddr %>
    <% end -%>
    <% if new_resource.mtu -%>
    mtu <%= new_resource.mtu %>
    <% end -%>
    <% if new_resource.gateway -%>
    gateway <%= new_resource.gateway %>
    <% end -%>
<% end -%>
<% end -%>
          }
          @config_path = "#{INTERFACES_DOT_D_DIR}/ifcfg-#{new_resource.device}"
        end

        def generate_config
          enforce_interfaces_dot_d_sanity
          super
        end

        protected

        def enforce_interfaces_dot_d_sanity
          # on ubuntu 18.04+ there's no interfaces file and it uses interfaces.d by default
          return if ::File.directory?(INTERFACES_DOT_D_DIR) && !::File.exist?(INTERFACES_FILE)

          # create /etc/network/interfaces.d via dir if it's missing
          directory INTERFACES_DOT_D_DIR

          # roll our own file_edit resource, this will not get reported until we have a file_edit resource
          interfaces_dot_d_for_regexp = INTERFACES_DOT_D_DIR.gsub(/\./, "\\.") # escape dots for the regexp
          regexp = %r{^\s*source\s+#{interfaces_dot_d_for_regexp}/\*\s*$}

          return if ::File.exist?(INTERFACES_FILE) && regexp.match(IO.read(INTERFACES_FILE))

          converge_by("modifying #{INTERFACES_FILE} to source #{INTERFACES_DOT_D_DIR}") do
            conf = Chef::Util::FileEdit.new(INTERFACES_FILE)
            conf.insert_line_if_no_match(regexp, "source #{INTERFACES_DOT_D_DIR}/*")
            conf.write_file
          end
        end

      end
    end
  end
end