import {Conf, ConfWWMeta} from "../../types/conf";
import {urlWatcher, UrlWatcherResult} from '../abstract/url-watcher'
import * as moment from 'moment'

function handleLateness(confHead: ConfWWMeta, data: WWMetaJson) {
  const diff = Math.round(Date.now()/1000 - data.now)
  if (diff >= confHead.maxLate) {
    return UrlWatcherResult.ko(`WWData is late by ${diff}s (>= ${confHead.maxLate})`)
  }
  return UrlWatcherResult.ok()
}

export function jsonWatcher(conf: Conf) {

  const URL_PATH = '/00wwView'

  return async (confWWMeta: ConfWWMeta) => {

    return urlWatcher(conf, async (html) => {
      const data = parseData(html)
      return handleLateness(confWWMeta, data)
    })({
      name: `WWData watcher ${confWWMeta.name}`,
      address: confWWMeta.address + URL_PATH,
      frequency: confWWMeta.frequency
    },
        () => `State OK WWMeta.json is up-to-date`,
        () => `State FAILURE WWMeta.json`,
        () => `State RECOVERED WWMeta.json`)
  }
}

function parseData(html: string): WWMetaJson {
  const h3 = html.match(/<h3>([\s\S]*)<\/h3>/)
  if (!h3) {
    throw `Could not parse H3 from WW`
  }
  const data = h3[1].match(/Bloc (\d+)\s(.+)\s(.+)/)
  if (!data) {
    throw `Could not parse datetime from H3`
  }
  const now = moment(`${data[2]}`, 'DD/MM/YYYY HH:mm:ss')
  return { now: now.unix() }
}

interface WWMetaJson {
  now: number
}