class VipnetGetter

# File lib/vipnet_getter.rb, line 7
def self.iplirconf(params)
  hostname = params[:hostname]
  password = params[:password]
  username = params[:username] || "vipnet"
  output_file_path = params[:output_file_path]

  # Adding digest to "known_hosts" if needed.
  require "ruby_expect"
  exp_ssh_digest = RubyExpect::Expect.spawn("/usr/bin/ssh #{username}@#{hostname}")
  exp_ssh_digest.timeout = 3
  exp_ssh_digest.procedure do
    each do
      expect /Are you sure you want to continue connecting \(yes\/no\)\?\s*$/ do
        send "yes"
      end
    end
  end

  logged = false
  puts "Logging to #{username}@#{hostname}..."

  # "TERM=xterm" solves "WARNING: terminal is not fully functional" issue when running script with cron
  # TODO: test.
  exp = RubyExpect::Expect.spawn("TERM=xterm luit -encoding KOI8-R /usr/bin/ssh #{username}@#{hostname}")
  exp.timeout = 3
  iplirconf_content = ""
  exp.procedure do
    each do
      expect /password:\s*$/ do
        send password
        puts "Entering password..."
      end

      # For some reason, if password is incorrect, script waits for timeout
      # and don't expect ">" for "iplir show config".
      # Thus, commented code below doesn't work
      # expect /Permission denied, please try again/ do
      #   puts "permission denied"
      # end

      expect />\s*$/ do
        command = "iplir show config"
        send command
        puts command

        # When running with cron, message appears:
        # "WARNING: terminal is not fully functional
        # -  (press RETURN)"
        # So we imitate pressing <Enter>.
        send ENTER_KEYCODE
        logged = true
      end
    end
    return nil unless logged

    # Reading iplirconf until "default= .*" or /tunneldefault= .*/ lines appeared.
    # ("default" for vipnet v3 and "tunneldefault" for vipnet v4.)
    retflag = false
    while !retflag
      retval = any do
        expect /.*:/m do
          iplirconf_content << last_match.to_s
          last_match.to_s.split("\n").each do |line|
            if line =~ /^default=\s.*/ || line =~ /^tunneldefault=\s.*/
              retflag = true
              break
            end
          end
          send PGDN_KEYCODE
        end
      end
    end
  end

  # Encode and remove unsupported characters.
  iplirconf_content.force_encoding("UTF-8")
                   .gsub!("\r", "")
                   .gsub!(/[^\w\s\p{Cyrillic}=\(\)\[\]:\.\,@\#$%\^\-!]/, "")

  # Remove trash in the beginning.
  iplirconf_content.gsub!(/iplir show config.*1h=/m, "")
                   .gsub!("[7moptvipnetuseriplir.conf[27m[K[K:[K11[K33[K", "")

  # Remove trash in the middle.
  iplirconf_content.gsub!(/\[K\d+\[K\d+\[K/, "") # [K33[K44[K
  iplirconf_content.gsub!(/:\[K\[K:/, "") # :[K[K:

  # Remove trash in the end.
  iplirconf_content.gsub!(/\[7m\(END\).*\[K\[K:/, "")

  # Remove trailing spaces and add carriage return.
  iplirconf_content.strip!
  iplirconf_content << "\n\n"

  if output_file_path
    File.open(output_file_path, "w:KOI8-R") { |f| f.write(iplirconf_content) }
    output_file_path
  else
    require "tempfile"
    iplirconf_file = Tempfile.new("iplirconf", encoding: "KOI8-R")
    iplirconf_file.write(iplirconf_content)
    iplirconf_file.flush
    iplirconf_file.path
  end
end