#!/usr/bin/env ruby

require("irb")
require("irb/completion")
require("rubygems")

begin
  gem('twitter4r', '>0.3.0')
  require("twitter")
  require("twitter/console")
  require("pp")
rescue Gem::LoadError
  begin
    gem("mbbx6spp-twitter4r", '>=0.3.1')
    require("twitter")
    require("twitter/console")
    require("pp")
  rescue Gem::LoadError
    abort("Error: You must install either twitter4r gem from Rubyforge with version 0.3.1 or greater or the mbbx6spp-twitter4r gem from GitHub's servers with version 0.3.1 or greater (and make sure it is a recent version of the gem).")
  end
end

module Twitter
  class OAuthAccess
    class << self
      @@OPTIONS = { :key => "", :secret => "" }
      def parse_options!
        OptionParser.new do |opt|
          opt.banner = "Usage: t4r-oauth-access [environment] [options]"
          opt.on("--key=[<YOUR KEY>]", 'Use this OAuth consumer key.') { |v| @@OPTIONS[:key] = v }
          opt.on("--secret=[<YOUR SECRET>]", 'Use this OAuth consumer secret.') { |v| @@OPTIONS[:secret] = v }
          opt.parse!(ARGV)
        end
      end

      def config_file
        result = ENV["T4R_CONFIG"]
        file_name = File.expand_path('twitter.yml')
        result ||= file_name if File.exists?(file_name)
        file_name = File.expand_path('twitter.yml', 'config')
        result ||= file_name if File.exists?(file_name)
        file_name = File.expand_path('~/.twitter.yml')
        result ||= file_name if File.exists?(file_name)
        result
      end

      def account
        ENV["T4R_ENV"] || ENV["MERB_ENV"] || ENV["RAILS_ENV"]
      end

      def run()
        # TODO: fill in here
        consumer = OAuth::Consumer.new(@@OPTIONS[:key], @@OPTIONS[:secret],
                                       :site => "https://twitter.com")
        rtoken = consumer.get_request_token
        puts "1. Visit this URL to grant your application authorization:"
        puts "   >> #{rtoken.authorize_url}"
        puts "2. When you have authorized your application to access your account, Twitter.com will display a PIN to you."
        print "3. Enter the PIN here: "
        pin = STDIN.readline.chomp
        atoken = rtoken.get_access_token(:oauth_verifier => pin)
        puts "4. Your access token details are:"
        puts "   >> key:    #{atoken.token}"
        puts "   >> secret: #{atoken.secret}"
        resp = atoken.get("/account/verify_credentials.json")
        data = JSON.parse(resp.body)
        puts
        puts "Your account details are:"
        p data
      end
    end
  end
end

def run_twitter4r_oauth_registration!
  @twitter = nil
  Twitter::OAuthAccess.parse_options!
  config_file = Twitter::OAuthAccess.config_file
  account = Twitter::OAuthAccess.account

  if config_file && account
    @twitter = Twitter::Client.from_config(config_file, account)
    puts "Used #{config_file} to create client for #{account} account."
    puts "Follow instructions below to grant authorization to your application and determine access token details."
    Twitter::OAuthAccess.run()
  else
    abort("Please make sure #{config_file} exists and contains your Twitter credentials (separated by account/environment) and that you specify the account/environment to use, e.g. if you have a 'test' section in your configuration file that you want to use set/export T4R_ENV=test as an environment variable or RAILS_ENV=test or MERB_ENV=test")
  end
end

run_twitter4r_oauth_registration!