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path: root/src/lib/Media/Anime/Airing/classify.ts
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import type { Media } from '$lib/Data/AniList/media';

export interface AnimeEpisodeState {
  progress: number;
  nextEpisode: number;
  airedEpisodes: number;
}

const hasAired = (airingAt: number | undefined, nowEpochSeconds: number) =>
  typeof airingAt === 'number' && airingAt <= nowEpochSeconds;

export const getAnimeEpisodeState = (
  media: Media,
  nowEpochSeconds = Date.now() / 1000
): AnimeEpisodeState => {
  const progress = media.mediaListEntry?.progress || 0;
  const nextEpisode =
    media.nextAiringEpisode?.nativeEpisode || media.nextAiringEpisode?.episode || 0;

  if (nextEpisode <= 0) {
    return {
      progress,
      nextEpisode,
      airedEpisodes: 0
    };
  }

  let airedEpisodes = Math.max(0, nextEpisode - 1);
  const airingAt = media.nextAiringEpisode?.airingAt;
  const nativeAiringAt = media.nextAiringEpisode?.nativeAiringAt;

  // If either source says the "next" episode already aired, treat it as released.
  if (hasAired(airingAt, nowEpochSeconds) || hasAired(nativeAiringAt, nowEpochSeconds))
    airedEpisodes = Math.max(airedEpisodes, nextEpisode);

  return {
    progress,
    nextEpisode,
    airedEpisodes
  };
};

export const hasDueEpisodes = (media: Media, nowEpochSeconds = Date.now() / 1000) => {
  const episodeState = getAnimeEpisodeState(media, nowEpochSeconds);

  return episodeState.airedEpisodes > episodeState.progress;
};

export const hasNoAiredEpisodes = (media: Media, nowEpochSeconds = Date.now() / 1000) => {
  const episodeState = getAnimeEpisodeState(media, nowEpochSeconds);

  return episodeState.airedEpisodes <= 0;
};