#!/usr/bin/env ruby

$:.unshift(File::join(File::dirname(File::dirname(__FILE__)), "lib"))

require 'rubygems'
require 'google_translate'

class Translate
  USAGE= <<-TEXT
    Usage:
      translate list                 - displays the list of supported languages
      translate detect "hello world" - detects language of text
      translate en:ru "hello world"  - translates from en to ru
      translate ru "hello world"     - translated from auto-detected language to ru 
  TEXT

  def initialize
    @translator = Google::Translator.new
  end

  def print_languages list, title
    puts USAGE
    puts list.join(', ')
  end

  def display text
    if RUBY_PLATFORM =~ /mswin32/
      File.open("temp.txt", "w") {|f| f.write text }
      %x[notepad temp.txt] 
    else
      puts text
    end
  end

  def run
    if(ARGV.size == 0)
      puts USAGE and return
    end

    case ARGV.shift

    when 'list':
      hash = @translator.supported_languages

      print_languages hash[:from_languages], "From Languages:"
      print_languages hash[:to_languages], "To Languages:"
    when 'detect':
      language = @translator.detect_language(ARGV.shift)

      puts "Language: #{language.inspect}"
    when /(..):(..)/
      from_text = ARGV.join(' ')
      from = $1
      to = $2

      display(@translator.translate(from.to_sym, to.to_sym, from_text))
    when /(..)/
      from_text = ARGV.join(' ')

      from = @translator.detect_language(from_text)['language']
      to = $1

      display(@translator.translate(from.to_sym, to.to_sym, from_text))
    end
  end
end

Translate.new.run