# Copyright (c) HashiCorp, Inc.
# SPDX-License-Identifier: BUSL-1.1

# rubocop:disable Metrics/MethodLength
# rubocop:disable Metrics/AbcSize
# rubocop:disable Style/BracesAroundHashParameters
#
# FIXME: address disabled warnings
#
require 'set'
require 'tempfile'
require 'pathname'
require 'vagrant/util/template_renderer'

module VagrantPlugins
  module GuestAlpine
    module Cap
      class ConfigureNetworks
        include Vagrant::Util
        def self.configure_networks(machine, networks)
          machine.communicate.tap do |comm|
            # First, remove any previous network modifications
            # from the interface file.
            comm.sudo("sed -e '/^#VAGRANT-BEGIN/,$ d' /etc/network/interfaces > /tmp/vagrant-network-interfaces.pre")
            comm.sudo("sed -ne '/^#VAGRANT-END/,$ p' /etc/network/interfaces | tail -n +2 > /tmp/vagrant-network-interfaces.post")

            # Accumulate the configurations to add to the interfaces file as
            # well as what interfaces we're actually configuring since we use that
            # later.
            interfaces = Set.new
            entries = []
            networks.each do |network|
              interfaces.add(network[:interface])
              entry = TemplateRenderer.render("guests/alpine/network_#{network[:type]}", { options: network })
              entries << entry
            end

            # Perform the careful dance necessary to reconfigure
            # the network interfaces
            temp = Tempfile.new('vagrant')
            temp.binmode
            temp.write(entries.join("\n"))
            temp.close

            comm.upload(temp.path, '/tmp/vagrant-network-entry')

            # Bring down all the interfaces we're reconfiguring. By bringing down
            # each specifically, we avoid reconfiguring eth0 (the NAT interface) so
            # SSH never dies.
            interfaces.each do |interface|
              comm.sudo("if [[ $(/sbin/ip a show eth#{interface} | grep UP) ]]; then /sbin/ifdown eth#{interface} 2> /dev/null; fi")
              comm.sudo("/sbin/ip addr flush dev eth#{interface} 2> /dev/null")
            end

            comm.sudo('cat /tmp/vagrant-network-interfaces.pre /tmp/vagrant-network-entry /tmp/vagrant-network-interfaces.post > /etc/network/interfaces')
            comm.sudo('rm -f /tmp/vagrant-network-interfaces.pre /tmp/vagrant-network-entry /tmp/vagrant-network-interfaces.post')

            # Bring back up each network interface, reconfigured
            interfaces.each do |interface|
              comm.sudo("/sbin/ifup eth#{interface}")
            end
          end
        end
      end
    end
  end
end
