const dayjs = require('dayjs')
const utc = require('dayjs/plugin/utc')
const timezone = require('dayjs/plugin/timezone')
const customParseFormat = require('dayjs/plugin/customParseFormat')

dayjs.extend(utc)
dayjs.extend(timezone)
dayjs.extend(customParseFormat)

module.exports = {
  site: 'mewatch.sg',
  days: 2,
  url: function ({ channel, date }) {
    const utcDate = date.isUTC() ? date.tz(dayjs.tz.guess(), true).utc() : date.utc()

    return `https://cdn.mewatch.sg/api/schedules?channels=${channel.site_id}&date=${utcDate.format(
      'YYYY-MM-DD'
    )}&duration=24&ff=idp,ldp,rpt,cd&hour=${utcDate.format(
      'HH'
    )}&intersect=true&lang=en&segments=all`
  },
  parser: function ({ content, channel }) {
    let programs = []
    const items = parseItems(content, channel)
    items.forEach(item => {
      const info = item.item
      programs.push({
        title: info.title,
        description: info.description,
        image: info.images.tile,
        episode: info.episodeNumber,
        season: info.seasonNumber,
        start: parseStart(item),
        stop: parseStop(item),
        rating: parseRating(info)
      })
    })

    return programs
  },
  async channels() {
    const axios = require('axios')
    const cheerio = require('cheerio')
    const data = await axios
      .get('https://www.mewatch.sg/channel-guide')
      .then(r => r.data)
      .catch(console.log)

    let channels = []
    const $ = cheerio.load(data)
    $('#side-nav > div > div > div > nav:nth-child(1) > ul > li > ul > li').each((i, el) => {
      const name = $(el).find('a > span').text()
      const url = $(el).find('a').attr('href')
      const [, site_id = null] = url.match(/\/(\d+)\?player-fullscreen/) ?? []

      if (!site_id) {
        return
      }

      channels.push({
        lang: 'en',
        name,
        site_id
      })
    })

    return channels
  }
}

function parseStart(item) {
  return dayjs(item.startDate)
}

function parseStop(item) {
  return dayjs(item.endDate)
}

function parseRating(info) {
  const classification = info.classification
  if (classification && classification.code) {
    const [, system, value] = classification.code.match(/^([A-Z]+)-([A-Z0-9]+)/) || [
      null,
      null,
      null
    ]

    return { system, value }
  }

  return null
}

function parseItems(content, channel) {
  const data = JSON.parse(content)
  if (!data || !Array.isArray(data)) return []
  const channelData = data.find(i => i.channelId === channel.site_id)

  return channelData && Array.isArray(channelData.schedules) ? channelData.schedules : []
}