'use strict'

import { youtube_v3 } from 'googleapis'
import { Context, Service, ServiceBroker, ServiceSchema } from 'moleculer'
import GoogleServices from '../mixins/google.mixin'
import { FeedResponse, FeedResult } from '../types/feed'
import { ApiMeta } from '../types/meta'

export default class YoutubeService extends Service {
  private google = new GoogleServices().google
  private channels: [channel: string, id: string][] = [
    ['Red Plateaus', 'UCsln1E-ttrNPsMivrnf9V7w'],
    ['Zoe Baker', 'UC3FD64RRsrCLpiZNkq7ZkSg'],
    ['Jonas Ceika,', 'UCSkzHxIcfoEr69MWBdo0ppg'],
    ['Radical Reviewer', 'UC_V9wKk1Dd2rpZ4fxj7pKXA'],
    ['donoteat01', 'UCFdazs-6CNzSVv1J0a-qy4A'],
    ['Contra', 'UCNvsIonJdJ5E4EXMa65VYpA'],
    ['Shaun', 'UCJ6o36XL0CpYb6U5dNBiXHQ'],
    ['hbomb', 'UClt01z1wHHT7c5lKcU8pxRQ'],
    ['Philo tube', 'UC2PA-AKmVpU6NKCGtZq_rKQ'],
    ['anark', 'UC1CjJYTUeor8EUFsbgwu5TQ']
  ]

  // @ts-ignore
	public constructor (public broker: ServiceBroker, schema: ServiceSchema<{}> = {}) {
		super(broker)

		this.parseServiceSchema(Service.mergeSchemas({
			name: 'youtube',
			actions: {
				/**
				 * Get aggregate feed
				 *
				 */
				feed: {
          cache: true,
					rest: {
						method: 'GET',
						path: '/feed',

					},
					async handler (this: YoutubeService, ctx: Context<{}, ApiMeta>): Promise<FeedResponse> {
						return this.GetAggregatedFeed()
					}
				}
			}
		}, schema))
	}

  public async GetAggregatedFeed (): Promise<FeedResponse> {
    const onlyVideos = (item: youtube_v3.Schema$Activity) => item.snippet.type === 'upload'

    return (await Promise.all(
        this.channels.map(([channel, id]) => this.GetActivities(id))
      ))
      .flatMap(response => response.data.items)
      .filter(onlyVideos)
      .map(item => this.PickActivityProperties(item))
  }

  private GetActivities (channelId: string) {
    return this.google.youtube('v3').activities.list({
      channelId,
      part: ['snippet', 'contentDetails'],
      maxResults: 1000
    })
  }

  private PickBestThumbnail (thumbnails: youtube_v3.Schema$ThumbnailDetails) {
    return String(Object.values(thumbnails).sort((a, b) => b.width - a.width)[0].url).split('/').pop()
    /* https://i.ytimg.com/vi/${id}/${thumbnail} */
  }

  private PickActivityProperties (activity: youtube_v3.Schema$Activity): FeedResult {
    return {
      title: activity.snippet.title,
      id: activity.contentDetails.upload.videoId,
      description: activity.snippet.description?.substring(0, 127).split('\n')[0],
      thumbnail: this.PickBestThumbnail(activity.snippet.thumbnails),
      channel: activity.snippet.channelId,
      date: new Date(activity.snippet.publishedAt).valueOf()
    }
  }
}