#!/usr/bin/env ruby

require 'socket'
require 'io/console'
require 'optparse'

options = {
  :port => 7570,
  :host => 'localhost'
}
OptionParser.new do |opt|
  opt.on('-pPORT', '--port PORT', Integer,
      'Port to connect to (defaults to 7570)') do |o|
    options[:port] = o
  end
  opt.on('-HHOST', '--host HOST', String,
        'Host to connect to (defaults to `localhost`)') do |o|
    options[:host] = o
  end
  opt.on('-h', '--help', 'Get help with this command') do
    puts opt
    exit
  end
end.parse!(into: options)

HOST = options[:host]
PORT = options[:port]
#PORT = 6789
VERSION = 0.01

socket = TCPSocket.new(HOST, PORT)

puts "PORT: #{PORT}"
puts "HOST: #{HOST}"

begin
  print "\x1b[?1049h\x1b[2J\x1b[3J" # Open and clear alternate buffer

  #reader = Thread.new do
  Thread.new do
    loop do
      msg = socket.gets
      exit 0 unless msg
      ver, msg = msg.split('|',2)
      next unless ver.to_f <= VERSION
      next unless msg != nil
      # In message version 0.01 and lower,
      # all messages are in an assumed format...
      row,col,chars = msg.split('|',3)
      print "\x1b[#{row};#{col}H#{chars}\x1b[A"
    end
  end

  while (char = STDIN.noecho(&:getch))
    exit unless char != "\x03" # ^C
    exit unless char != "\x04" # ^D
    next unless char.ord >= 0x20 # Non printing
    next unless char.ord != 0x7F # DEL (Non print)
    socket.puts "#{VERSION}|#{char}"
  end
ensure
  print "\x1b[?1049l" # Back to regular buffer
end