const store = require('./store')
const _ = require('lodash')

const playlist = {}

class Playlist {
  constructor(items = [], options = {}) {
    this.header = {}
    if (options.public) {
      let guides = items
        .map(item => (item.guides.length ? item.guides[0].url : null))
        .filter(i => i)
      this.header['x-tvg-url'] = _.uniq(guides).sort().join(',')
    }

    this.links = []
    for (const item of items) {
      const stream = store.create(item)

      let attrs
      if (options.public) {
        attrs = {
          'tvg-id': stream.get('tvg_id'),
          'tvg-country': stream.get('tvg_country'),
          'tvg-language': stream.get('tvg_language'),
          'tvg-logo': stream.get('tvg_logo'),
          'group-title': stream.get('group_title'),
          'user-agent': stream.get('user_agent') || undefined
        }
      } else {
        attrs = {
          'tvg-id': stream.get('tvg_id'),
          status: stream.get('status'),
          'user-agent': stream.get('user_agent') || undefined
        }
      }

      const vlcOpts = {
        'http-referrer': stream.get('http_referrer') || undefined,
        'http-user-agent': stream.get('user_agent') || undefined
      }

      this.links.push({
        url: stream.get('url'),
        title: stream.get('title'),
        attrs,
        vlcOpts
      })
    }
  }

  toString() {
    let output = `#EXTM3U`
    for (const attr in this.header) {
      const value = this.header[attr]
      output += ` ${attr}="${value}"`
    }
    output += `\n`

    for (const link of this.links) {
      output += `#EXTINF:-1`
      for (const name in link.attrs) {
        const value = link.attrs[name]
        if (value !== undefined) {
          output += ` ${name}="${value}"`
        }
      }
      output += `,${link.title}\n`

      for (const name in link.vlcOpts) {
        const value = link.vlcOpts[name]
        if (value !== undefined) {
          output += `#EXTVLCOPT:${name}=${value}\n`
        }
      }

      output += `${link.url}\n`
    }

    return output
  }
}

playlist.create = function (items, options) {
  return new Playlist(items, options)
}

module.exports = playlist