# Description:
#   Doge meme generator
#   Requires hubot-tg adapter to access message history
#
# Configuration:
#   Uses hubot-tg enviroment variables
#
# Commands
#   hubot doge [n] - crea un meme doge con messaggi recenti della chat
#
# Author:
#   Michele Guerini Rocco (rnhmjoj)
#


net = require 'net'

module.exports = (robot) ->
  match_all = (regex, str) ->
    matches = []
    str.replace regex, ->
      arr = [].slice.call arguments, 0
      extras = arr.splice -2
      arr.index = extras[0]
      arr.input = extras[1]
      matches.push arr
    matches

  concat = (list) -> list.reduce (x, y) -> x.concat y

  escape = (str) ->
    str.replace(/\d|\?|#/g,    '') # not supported
       .replace(     /\ /g, '%20') # spaces

  doge_url = (text) ->
    "http://dogr.io/#{escape text}.png?split=false"

  shiba = (res, words) ->
    prefix = [ 'much', 'such', 'many', 'very']
    word   = words.filter (x) ->
      /^[a-zA-ZàèéìòùÀÈÉÌÒÙ\-_!&@#?]{4,}$/.test x
    (res.random prefix) + ' ' + (res.random words)

  run_command = (command, callback) ->
    client = net.connect robot.adapter.port, robot.adapter.host, ->
      client.write command+'\n'
    client.setEncoding 'utf8'
    client.on 'data', (reply) ->
      if callback?
        callback (reply.split '\n')[1..-3]
      client.end()

  get_history = (chat, size, callback) ->
    regex = /\[(.+)\] (.+) [>«»]+ ((?:(?!\n(\[|\d))[\s\S])+)/g
    parse_line = (x) ->
      date: x[1]
      peer: x[2].replace chat + ' ', ''
      text: x[3].trim().replace '\n', ' '
    run_command "history #{chat} #{size}", (lines) ->
      callback ((match_all regex, lines.join '\n').map parse_line)

  robot.respond /doge(?: (\d+))?/, (res) ->
    n = res.match[1] || 20
    get_history res.message.room, n, (history) ->
      words   = concat (message.text.split ' ' for message in history)
      sample  = (res.random ['wow', shiba res, words] for _ in [0..8])
      res.send (doge_url sample.join '/')