Get recently liked tracks

import dayjs from '[email protected]';

import isBetween from 'dayjs/plugin/isBetween';

import { Client, Saved, Track } from '[email protected]';

dayjs.extend(isBetween);

type Spotify = {

  token: string;

}

const MAX_TRACKS_PER_PAGE = 50;

export async function main(

  spotifyCredentials: Spotify,

  lookbackLength: number,

  lookbackUnits: 'years' | 'months' | 'weeks' | 'days' | 'hours' | 'minutes' | 'seconds' | 'milliseconds' = 'minutes',

  fetchIntervalMs: number = 1000,

) {

  const client = await Client.create({

    token: spotifyCredentials.token,

    userAuthorizedToken: true

  });

  const now = dayjs();

  const startTime = now.subtract(lookbackLength, lookbackUnits);

  console.log(`Finding ${client.user.displayName}'s liked tracks from the last ${lookbackLength} ${lookbackUnits}`);

  let offset = 0;

  const results: Saved<Track>[] = [];

  while (true) {

    const likedTracks = await client.user.getSavedTracks({

      limit: MAX_TRACKS_PER_PAGE,

      offset: offset

    });

    offset += likedTracks.length;

    console.log(`Searching ${likedTracks.length} liked tracks (${offset} searched total)`);

    let foundTracks = 0;

    for (const track of likedTracks) {

      if (dayjs(track.addedAt).isBetween(startTime, now)) {

        console.log(`Found track '${track.item.name}' (liked at ${track.addedAt})`);

        results.push(track);

        foundTracks += 1;

      }

    }

    console.log(`Found ${foundTracks} recently liked tracks`);

    if (foundTracks === 0) {

      break;

    }

    // wait for a specified interval between calls to avoid being rate limited

    await new Promise(res => setTimeout(res, fetchIntervalMs));

  }

  console.log(`Found a total of ${results.length} liked tracks in the last ${lookbackLength} ${lookbackUnits}`);

  return results;

}