const moment = require('moment')
const {log, BaseKonnector, saveBills, requestFactory} = require('cozy-konnector-libs')

const baseUrl = 'https://espace-client.enercoop.fr'
const loginUrl = baseUrl + '/login'
const billUrl = baseUrl + '/mon-espace/factures/'
moment.locale('fr')

let rq = requestFactory({
  cheerio: true,
  json: false,
  debug: false,
  jar: true
})

module.exports = new BaseKonnector(function fetch (fields) {
  return logIn(fields)
  .then(parsePage)
  .then(entries => saveBills(entries, fields.folderPath, {
    timeout: Date.now() + 60 * 1000,
    identifiers: ['Enercoop']
  }))
})

// Procedure to login to Enercoop website.
function logIn (fields) {
  const form = {
      email: fields.login,
      password: fields.password,
  }

  const options = {
    url: loginUrl,
    method: 'POST',
    form: form,
    resolveWithFullResponse: true,
    followAllRedirects: true,
    simple: false
  }

  return rq(options)
  .then(res => {
    const isNot200 = res.statusCode !== 200
    if (isNot200) {
      log('info', 'Authentification error')
      throw new Error('LOGIN_FAILED')
    }

    const url = `${billUrl}`
    return rq(url)
    .catch(err => {
      console.log(err, 'authentication error details')
      throw new Error('LOGIN_FAILED')
    })
  })
}

// Parse the fetched DOM page to extract bill data.
function parsePage ($) {
  const bills = []
  $('.invoice-line').each(function () {
    //one bill per line = a <li> with 'invoice-id' data-attr
    let billId = $(this).data('invoice-id')

    let amount = $(this).find('.amount').text()
    amount = amount.replace('€','')
    amount = amount.replace(',', '.').trim()
    amount = parseFloat(amount)

    //gets pdf download URL
    let pdfUrl = $(this).find('a > i').data('url')
    pdfUrl = baseUrl + pdfUrl

    //<French month>-YYYY format (Décembre - 2017)
    let billDate = $(this).find('.invoiceDate').text().trim()
    let monthAndYear = billDate.split('-')
    let billYear = monthAndYear[0].trim()
    let billMonth = monthAndYear[1].trim()

    billMonth = moment.months().indexOf(billMonth.toLowerCase()) + 1
    billMonth = billMonth < 10 ? '0' + billMonth : billMonth
    let date = moment(billYear + billMonth, 'YYYYMM')

    let bill = {
      amount,
      date: date.toDate(),
      vendor: 'Enercoop',
      filename: `${date.format('YYYYMM')}_enercoop.pdf`,
      fileurl: pdfUrl
    }

    bills.push(bill)
  })

  return bills
}