module Hostscare

# File lib/hostscare.rb, line 29
def self.build_hosts(hosts, ph_start, ph_end, someonewhocares_hosts)
  final_hosts = [hosts,
                 ph_start,
                 "# -- Updated on #{Time.now}",
                 someonewhocares_hosts,
                 ph_end]

  final_hosts.map(&:strip)
             .join("\n\n")
end

# File lib/hostscare.rb, line 11
def self.cleanup
  hosts = File.read(LOCAL_HOSTS_FILE)
  write(raw_hosts(hosts), LOCAL_HOSTS_FILE)
end

# File lib/hostscare.rb, line 50
def self.raw_hosts(txt)
  hosts = []
  header_txt = txt.scan(/^((.|\n)*)#{PLACEHOLDER_START}/)
  hosts << header_txt[0][0] if header_txt.count.positive?

  footer_txt = txt.scan(/#{PLACEHOLDER_END}((.|\n)*)/)
  hosts << footer_txt[0][0] if footer_txt.count.positive?

  hosts.count.positive? ? hosts.map(&:strip).join("\n\n") : txt
end

# File lib/hostscare.rb, line 16
def self.update
  hosts = File.read(LOCAL_HOSTS_FILE)
  someonewhocares_hosts = URI.open(PUBLIC_HOSTS_FILE).read

  new_hosts = build_hosts(raw_hosts(hosts),
                          PLACEHOLDER_START,
                          PLACEHOLDER_END,
                          someonewhocares_hosts)

  write(new_hosts, LOCAL_HOSTS_FILE)
end

# File lib/hostscare.rb, line 40
def self.write(txt, path)
  File.open(path, 'w') do |f|
    f.write(txt)
  end
  puts "🍺 #{path} updated!"
rescue Errno::EACCES
  puts "❌ Requires sudo to update the file #{path}"
end