text: const api = require('../core/api')
  const _ = require('lodash')
  
  module.exports = async function (streams = []) {
  	streams = _.filter(streams, stream => stream.is_nsfw === false)
  
  	await api.regions.load()
  	let regions = await api.regions.all()
  	regions = _.keyBy(regions, 'code')
  
  	let items = []
  	streams.forEach(stream => {
  		if (!stream.broadcast_area.length) {
  			const item = _.cloneDeep(stream)
  			item.group_title = 'Undefined'
  			items.push(item)
  			return
  		}
  
  		getChannelRegions(stream, { regions }).forEach(region => {
  			const item = _.cloneDeep(stream)
  			item.group_title = region.name
  			items.push(item)
  		})
  	})
  
  	items = _.sortBy(items, i => {
  		if (i.group_title === 'Undefined') return ''
  
  		return i.group_title
  	})
  
  	return { filepath: 'index.region.m3u', items }
  }
  
  function getChannelRegions(stream, { regions }) {
  	return stream.broadcast_area
  		.reduce((acc, item) => {
  			const [type, code] = item.split('/')
  			switch (type) {
  				case 'r':
  					acc.push(regions[code])
  					break
  				case 's':
  					const [c] = code.split('-')
  					const r1 = _.filter(regions, { countries: [c] })
  					acc = acc.concat(r1)
  					break
  				case 'c':
  					const r2 = _.filter(regions, { countries: [code] })
  					acc = acc.concat(r2)
  					break
  			}
  			return acc
  		}, [])
  		.filter(i => i)
  }
  