#-- vim:sw=2:et
#++
#
# :title: Twitter Status Update for rbot
#
# Author:: Carter Parks (carterparks) <carter@carterparks.com>
# Author:: Giuseppe "Oblomov" Bilotta <giuseppe.bilotta@gmail.com>
# Author:: NeoLobster <neolobster@snugglenets.com>
#
# Copyright:: (C) 2007 Carter Parks
# Copyright:: (C) 2007 Giuseppe Bilotta
#
# Users can setup their twitter username and password and then begin updating
# twitter whenever

begin
  require 'oauth'
rescue LoadError
  error "OAuth module could not be loaded, twits will not be submitted and protected twits will not be accessible"
end

require 'yaml'
require 'rexml/rexml'

class TwitterPlugin < Plugin
   Config.register Config::StringValue.new('twitter.key',
      :default => "",
      :desc => "Twitter OAuth Consumer Key")

   Config.register Config::StringValue.new('twitter.secret',
      :default => "",
      :desc => "Twitter OAuth Consumer Secret")

    Config.register Config::IntegerValue.new('twitter.status_count',
      :default => 1, :validate => Proc.new { |v| v > 0 && v <= 10},
      :desc => "Maximum number of status updates shown by 'twitter status'")

    Config.register Config::IntegerValue.new('twitter.friends_status_count',
      :default => 3, :validate => Proc.new { |v| v > 0 && v <= 10},
      :desc => "Maximum number of status updates shown by 'twitter friends status'")

  def initialize
    super

    @has_oauth = defined? OAuth

    class << @registry
      def store(val)
        val
      end
      def restore(val)
        val
      end
    end
  end

  def report_oauth_missing(m, failed_action)
    m.reply [failed_action, "I cannot authenticate to Twitter (OAuth not available)"].join(' because ')
  end

  def report_key_missing(m, failed_action)
    m.reply [failed_action, "no Twitter Consumer Key/Secret is defined"].join(' because ')
  end

  def help(plugin, topic="")
    return "twitter status [nick] => show nick's (or your) status, use 'twitter friends status [nick]' to also show the friends' timeline | twitter update [status] => updates your status on twitter | twitter authorize => Generates an authorization URL which will give you a PIN to authorize the bot to use your twitter account. | twitter pin [pin] => Finishes bot authorization using the PIN provided by the URL from twitter authorize. | twitter deauthorize => Makes the bot forget your Twitter account. | twitter actions [on|off] => enable/disable twitting of actions (/me does ...)"
  end

  # update the status on twitter
  def get_status(m, params)
    friends = params[:friends]

    if @registry.has_key?(m.sourcenick + "_access_token")
      @access_token = YAML::load(@registry[m.sourcenick + "_access_token"])
      nick = params[:nick] || @access_token.params[:screen_name]
    else
      if friends
        if @has_oauth
          m.reply "You are not authorized with Twitter. Please use 'twitter authorize' first to use this feature."
        else
          report_oauth_missing(m, "I cannot retrieve your friends status")
        end
        return false
      end
      nick = params[:nick]
    end

    if not nick
      m.reply "you should specify the username of the twitter to use, or identify using 'twitter authorize'"
      return false
    end

    count = friends ? @bot.config['twitter.friends_status_count'] : @bot.config['twitter.status_count']
    user = URI.escape(nick)
    if @has_oauth and @registry.has_key?(m.sourcenick + "_access_token")
        if friends
          #no change to count variable
          uri = "https://api.twitter.com/1/statuses/friends_timeline.xml?count=#{count}"
          response = @access_token.get(uri).body
        else
          uri = "https://api.twitter.com/1/statuses/user_timeline.xml?screen_name=#{user}&count=#{count}"
          response = @access_token.get(uri).body
        end
    else
       #unauthorized user, will try to get from public timeline the old way
       uri = "http://twitter.com/statuses/user_timeline/#{user}.xml?count=#{count}"
       response = @bot.httputil.get(uri, :cache => false)
    end
    debug response

    texts = []

    if response
      begin
        rex = REXML::Document.new(response)
        rex.root.elements.each("status") { |st|
          # month, day, hour, min, sec, year = st.elements['created_at'].text.match(/\w+ (\w+) (\d+) (\d+):(\d+):(\d+) \S+ (\d+)/)[1..6]
          # debug [year, month, day, hour, min, sec].inspect
          # time = Time.local(year.to_i, month, day.to_i, hour.to_i, min.to_i, sec.to_i)
          time = Time.parse(st.elements['created_at'].text)
          now = Time.now
          # Sometimes, time can be in the future; invert the relation in this case
          delta = ((time > now) ? time - now : now - time)
          msg = st.elements['text'].to_s + " (#{Utils.secs_to_string(delta.to_i)} ago via #{st.elements['source'].to_s})"
          author = ""
          if friends
            author = Utils.decode_html_entities(st.elements['user'].elements['name'].text) + ": " rescue ""
          end
          texts << author+Utils.decode_html_entities(msg).ircify_html
        }
        if friends
          # friends always return the latest 20 updates, so we clip the count
          texts[count..-1]=nil
        end
      rescue
        error $!
        if friends
          m.reply "could not parse status for #{nick}'s friends"
        else
          m.reply "could not parse status for #{nick}"
        end
        return false
      end
      if texts.empty?
        m.reply "No status updates!"
      else
        m.reply texts.reverse.join("\n")
      end
      return true
    else
      if friends
        rep = "could not get status for #{nick}'s friends"
        rep << ", try asking in private" unless m.private?
      else
        rep = "could not get status for #{nick}"
      end
      m.reply rep
      return false
    end
  end

  def deauthorize(m, params)
    if @registry.has_key?(m.sourcenick + "_request_token")
      @registry.delete(m.sourcenick + "_request_token")
    end
    if @registry.has_key?(m.sourcenick + "_access_token")
      @registry.delete(m.sourcenick + "_access_token")
    end
    m.reply "Done! You can reauthorize this account in the future by using 'twitter authorize'"
  end

  def authorize(m, params)
    failed_action = "we can't complete the authorization process"
    unless @has_oauth
      report_oauth_missing(m, failed_action)
      return false
    end

    #remove all old authorization data
    if @registry.has_key?(m.sourcenick + "_request_token")
      @registry.delete(m.sourcenick + "_request_token")
    end
    if @registry.has_key?(m.sourcenick + "_access_token")
      @registry.delete(m.sourcenick + "_access_token")
    end

    key = @bot.config['twitter.key']
    secret = @bot.config['twitter.secret']
    if key.empty? or secret.empty?
      report_key_missing(m, failed_action)
      return false
    end

    @consumer = OAuth::Consumer.new(key, secret, {
      :site => "https://api.twitter.com",
      :request_token_path => "/oauth/request_token",
      :access_token_path => "/oauth/access_token",
      :authorize_path => "/oauth/authorize"
    } )
    begin
      @request_token = @consumer.get_request_token
    rescue OAuth::Unauthorized
      m.reply _("My authorization failed! Did you block me? Or is my Twitter Consumer Key/Secret pair incorrect?")
      return false
    end
    @registry[m.sourcenick + "_request_token"] = YAML::dump(@request_token)
    m.reply "Go to this URL to get your authorization PIN, then use 'twitter pin <pin>' to finish authorization: " + @request_token.authorize_url
  end

  def pin(m, params)
     unless @registry.has_key?(m.sourcenick + "_request_token")
       m.reply "You must first use twitter authorize to get an authorization URL, which you can use to get a PIN for me to use to verify your Twitter account"
       return false
     end
     @request_token = YAML::load(@registry[m.sourcenick + "_request_token"])
     begin
       @access_token = @request_token.get_access_token( { :oauth_verifier => params[:pin] } )
     rescue
       m.reply "Error: There was a problem registering your Twitter account. Please make sure you have the right PIN. If the problem persists, use twitter authorize again to get a new PIN"
       return false
     end
     @registry[m.sourcenick + "_access_token"] = YAML::dump(@access_token)
     m.reply "Okay, you're all set"
  end

  # update the status on twitter
  def update_status(m, params)
    unless @has_oauth
      report_oauth_missing(m, "I cannot update your status")
      return false
    end

    unless @registry.has_key?(m.sourcenick + "_access_token")
       m.reply "You must first authorize your Twitter account before tweeting."
       return false;
    end
    @access_token = YAML::load(@registry[m.sourcenick + "_access_token"])

    uri = "https://api.twitter.com/statuses/update.json"
    msg = params[:status].to_s

    if msg.length > 140
      m.reply "your status message update is too long, please keep it under 140 characters"
      return
    end

    response = @access_token.post(uri, { :status => msg })
    debug response

    reply_method = params[:notify] ? :notify : :reply
    if response.class == Net::HTTPOK
      m.__send__(reply_method, "status updated")
    else
      m.__send__(reply_method, "could not update status")
    end
  end

  # ties a nickname to a twitter username and password
  def identify(m, params)
    @registry[m.sourcenick + "_username"] = params[:username].to_s
    @registry[m.sourcenick + "_password"] = params[:password].to_s
    m.reply "you're all set up!"
  end

  # update on ACTION if the user has enabled the option
  # Possible TODO: move the has_oauth check further down and alert
  # the user the first time we do not update because of the missing oauth
  def ctcp_listen(m)
    return unless @has_oauth
    return unless m.action?
    return unless @registry[m.sourcenick + "_actions"]
    update_status(m, :status => m.message, :notify => true)
  end

  # show or toggle action twitting
  def actions(m, params)
    case params[:toggle]
    when 'on'
      @registry[m.sourcenick + "_actions"] = true
      m.okay
    when 'off'
      @registry.delete(m.sourcenick + "_actions")
      m.okay
    else
      if @registry[m.sourcenick + "_actions"]
        m.reply _("actions will be twitted")
      else
        m.reply _("actions will not be twitted")
      end
    end
  end
end

# create an instance of our plugin class and register for the "length" command
plugin = TwitterPlugin.new
plugin.map 'twitter update *status', :action => "update_status", :threaded => true
plugin.map 'twitter authorize', :action => "authorize", :public => false
plugin.map 'twitter deauthorize', :action => "deauthorize", :public => false
plugin.map 'twitter pin :pin', :action => "pin", :public => false
plugin.map 'twitter actions [:toggle]', :action => "actions", :requirements => { :toggle => /^on|off$/ }
plugin.map 'twitter status [:nick]', :action => "get_status", :threaded => true
plugin.map 'twitter :friends [status] [:nick]', :action => "get_status", :requirements => { :friends => /^friends?$/ }, :threaded => true