const { lyrics } = require('#api');
const { paginator } = require('#client');
const { PERMISSION_GROUPS } = require('#constants');

const { createEmbed, formatPaginationEmbeds, page } = require('#utils/embed');
const { acknowledge } = require('#utils/interactions');
const { smallIconPill, smallPill } = require('#utils/markdown');
const { editOrReply } = require('#utils/message')
const { STATICS } = require('#utils/statics')

const { ApplicationCommandOptionTypes, InteractionContextTypes, ApplicationIntegrationTypes } = require('detritus-client/lib/constants');

const META_FIELDS = {
  "Album": "album",
  "Released": "note"
}

function renderMetadata(track){
  let metadata = track.metadata
  const pills = []
  for(const m of metadata){
    if(!META_FIELDS[m.id]) continue;
    pills.push(`${smallIconPill(META_FIELDS[m.id], `${m.id}`)} ${smallPill(m.value)}`)
  }
  return pills.join('\n');
}

// These have to be synced with the backend (search_service/endpoints/lyrics).
const LYRIC_PROVIDERS = {
  UNKNOWN_PROVIDER: 0,
  MUSIXMATCH: 1,
  GENIUS: 2,
  LRCLIB: 3,
}

function renderLyricsFooter(context, provider){
  switch(provider){
    case LYRIC_PROVIDERS.MUSIXMATCH:
      return {
        text: `Musixmatch • ${context.application.name}`,
        iconUrl: STATICS.musixmatch
      }
      break;
    case LYRIC_PROVIDERS.GENIUS:
      return {
        text: `Genius • ${context.application.name}`,
        iconUrl: STATICS.genius
      }
      break;
    case LYRIC_PROVIDERS.LRCLIB:
      return {
        text: `LRCLib • ${context.application.name}`
      }
      break;
    default: // Fallback, this should never happen
      return {
        text: context.application.name,
        iconUrl: STATICS.labscore
      }
  }
}

function createLyricsPage(context, search, fields){
  let em = createEmbed("default", context, {
    author: {
      iconUrl: search.body.track.artist_cover,
      name: `${search.body.track.title}`
    },
    description: `-# Song by ${search.body.track.artist}`,
    fields: fields,
    footer: renderLyricsFooter(context, search.body.lyrics_provider)
  }) 
  if(search.body.track.cover) em.thumbnail = { url: search.body.track.cover }
  if(search.body.track.metadata.length) em.description += `\n\n${renderMetadata(search.body.track)}`
  return em;
}

module.exports = {
  name: 'lyrics',
  description: 'Search for song lyrics.',
  contexts: [
    InteractionContextTypes.GUILD,
    InteractionContextTypes.PRIVATE_CHANNEL,
    InteractionContextTypes.BOT_DM
  ],
  integrationTypes: [
    ApplicationIntegrationTypes.USER_INSTALL
  ],
  options: [
    {
      name: 'query',
      description: 'Song name or partial lyrics.',
      type: ApplicationCommandOptionTypes.TEXT,
      required: true
    },
    {
      name: 'incognito',
      description: 'Makes the response only visible to you.',
      type: ApplicationCommandOptionTypes.BOOLEAN,
      required: false,
      default: false
    }
  ],
  run: async (context, args) => {
    await acknowledge(context, args.incognito, [...PERMISSION_GROUPS.baseline_slash]);
    
    try{
      let search = await lyrics(context, args.query)
      search = search.response

      if(search.body.status == 2) return editOrReply(context, createEmbed("error", context, search.body.message))
      let fields = [];
      
      for(const f of search.body.lyrics.split('\n\n')){
        fields.push({
          name: '​',
          value: f.replace(/\[(.*?)\]/g,"-# [$1]").substr(0,1024),
          inline: false
        })
      }

      let pages = []
      while(fields.length) {
        let pageFields = fields.splice(0,3)
        
        // Display less fields if they take up too much vertical space
        while(pageFields.map((f)=>f.value).join('\n').split('\n').length >= 30 && pageFields[1]){
          fields.unshift(pageFields[pageFields.length - 1])
          pageFields = pageFields.splice(0, pageFields.length - 1)
        }
        
        pages.push(page(createLyricsPage(context, search, pageFields)))
      }
      
      await paginator.createPaginator({
        context,
        pages: formatPaginationEmbeds(pages)
      });
    }catch(e){
      if(e.response?.body?.status && e.response.body.status == 2 && e.response.body.message) return editOrReply(context, createEmbed("error", context, e.response.body.message))
      console.log(JSON.stringify(e.raw) || e)
      return editOrReply(context, createEmbed("error", context, `Something went wrong.`))
    }
  },
};