Compendium loading

/**
 * @param source what type of data source it's been loaded - compendium names are fetched from the settings
 */
export async function getSources(source: keyof Source) {
  const propValue: Source = (await game.settings.get(Constants.MODULE_NAME, SettingKeys.SOURCES)) as Source;
  const packs = propValue[source];
  const selectedPacks = Object.keys(packs).filter((p: string) => (packs as any)[p]);
  const ret = await getItemListFromPackListByNames(selectedPacks); // this is Ghost's Function X
  return ret;
}

// where Source is..
export interface Source {
  races: any;
  racialFeatures: any;
  classes: any;
  classFeatures: any;
  backgroundFeatures: any;
  spells: any;
  feats: any;
}

/**
 * @param source what type of data source it's been loaded - compendium names are fetched from the settings
 */
export async function getSources(source: keyof Source) {
  const propValue: Source = (await game.settings.get(Constants.MODULE_NAME, SettingKeys.SOURCES)) as Source;
  const packs = propValue[source];
  const selectedPacks = Object.keys(packs).filter((p: string) => (packs as any)[p]);
  const ret = await getItemListFromPackListByNames(selectedPacks); // this is Ghost's Function X
  return ret;
}

// where Source is..
export interface Source {
  races: any;
  racialFeatures: any;
  classes: any;
  classFeatures: any;
  backgroundFeatures: any;
  spells: any;
  feats: any;
}

export async function getItemListFromPackListByNames(packNames: string[]) {
  const allItems = [];
  for (const compendiumName of packNames) {
    const pack = game.packs.get(compendiumName);
    const worldItems = game.items;
    if (!worldItems) throw new Error('game.items not initialized yet');
    if (!pack) ui.notifications?.warn(`No pack for name [${compendiumName}]!`);
    if (pack?.documentName !== 'Item') throw new Error(`${compendiumName} is not an Item pack`);
    const itemPack = pack as CompendiumCollection<CompendiumCollection.Metadata & { entity: 'Item' }>;
    const itemsPromises: Promise<Item | null | undefined>[] = [];
    for (const itemIndex of pack.index.keys()) {
      const item = itemPack.getDocument(itemIndex);
      itemsPromises.push(item);
    }
    const items = await Promise.all(itemsPromises);
    allItems.push(
      ...items
        .filter((item): item is Item => !!item)
        .map((item) => {
          const itemFromCompendium = worldItems.fromCompendium(item);
          // intentionally adding the flag without using the API as I don't want to persist this flag
          // this should be enough and more lightweight - this id/link is used to create the entity-link popups
          // as freshly created items or some ddbi imported ones don't seem to have the right core flag
          itemFromCompendium.flags.hct = {
            link: {
              id: item.id,
              pack: item.pack,
            },
          };
          return itemFromCompendium;
        }),
    );
  }
  return allItems;
}

export async function getItemListFromPackListByNames(packNames: string[]) {
  const allItems = [];
  for (const compendiumName of packNames) {
    const pack = game.packs.get(compendiumName);
    const worldItems = game.items;
    if (!worldItems) throw new Error('game.items not initialized yet');
    if (!pack) ui.notifications?.warn(`No pack for name [${compendiumName}]!`);
    if (pack?.documentName !== 'Item') throw new Error(`${compendiumName} is not an Item pack`);
    const itemPack = pack as CompendiumCollection<CompendiumCollection.Metadata & { entity: 'Item' }>;
    const itemsPromises: Promise<Item | null | undefined>[] = [];
    for (const itemIndex of pack.index.keys()) {
      const item = itemPack.getDocument(itemIndex);
      itemsPromises.push(item);
    }
    const items = await Promise.all(itemsPromises);
    allItems.push(
      ...items
        .filter((item): item is Item => !!item)
        .map((item) => {
          const itemFromCompendium = worldItems.fromCompendium(item);
          // intentionally adding the flag without using the API as I don't want to persist this flag
          // this should be enough and more lightweight - this id/link is used to create the entity-link popups
          // as freshly created items or some ddbi imported ones don't seem to have the right core flag
          itemFromCompendium.flags.hct = {
            link: {
              id: item.id,
              pack: item.pack,
            },
          };
          return itemFromCompendium;
        }),
    );
  }
  return allItems;
}