import { Book, BookEntryKind } from "@/types/book";

export type FlattenedBookEntry = {
  id: string;
  title: string;
  kind: BookEntryKind;
  order: number;
  content: string[];
  sectionId: string;
  sectionTitle: string;
  sectionKind: BookEntryKind;
  flatIndex: number;
};

export function getBookEntries(book: Book): FlattenedBookEntry[] {
  return book.sections.flatMap((section) =>
    section.entries.map((entry) => ({
      ...entry,
      sectionId: section.id,
      sectionTitle: section.title,
      sectionKind: section.kind,
      flatIndex: 0
    }))
  ).map((entry, index) => ({
    ...entry,
    flatIndex: index
  }));
}

export function getBookContentCount(book: Book) {
  return getBookEntries(book).length;
}

export function getBookStructureStats(book: Book) {
  const entries = getBookEntries(book);
  return {
    loreCount: entries.filter((item) => item.kind === "lore").length,
    novelCount: entries.filter((item) => item.kind === "novel").length
  };
}