var Promise = require('promise')
var request = require('request')

var requestPromise = function (url, urlArgs) {
  var promise = new Promise(function (resolve, reject) {
    request({
      url: url,
      qs: urlArgs,
      json: false
    }, function (error, response, body) {
      if (!error && response.statusCode === 200) {
        resolve(body)
      } else {
        reject(error)
      }
    })
  })
  return promise
}

module.exports = function (config) {
  // http://stackoverflow.com/questions/13087888/getting-the-page-title-from-a-scraped-webpage
  var getTitle = function (url) {
    var re = /(<\s*title[^>]*>((.|\n)+?)<\s*\/\s*title)>/gi
    var urlArgs = {}

    var promise = new Promise(function (resolve, reject) {
      var urlPromise = requestPromise(url, urlArgs)
      urlPromise.then(function (data) {
        var match = re.exec(data)

        if (match && match[2]) {
          var title = match[2].trim() // remove whitespace
          title = title.replace(/\r?\n|\r/g, '') // remove newlines

          resolve(title)
        } else {
          reject(new Error())
        }
      })
    })
    return promise
  }

  return getTitle
}