import { parsePartialDate } from "@sttracker/plugin-sdk/partial-date";
import type { EntryFields, SourceRecord, Status, WorkHint } from "@sttracker/plugin-sdk/types";

export interface HcBook {
  id: number;
  title: string;
  release_year?: number | null;
  contributions?: { author: { name: string } | null }[];
  book_series?: { position: number | null; series: { id: number; name: string } }[];
}
export interface HcRead { id: number; started_at: string | null; finished_at: string | null; progress_pages: number | null }
export interface HcUserBook {
  id: number;
  status_id: number | null;
  rating: number | null;
  review_raw: string | null;
  private_notes: string | null;
  starred: boolean | null;
  updated_at: string;
  merged_at: string | null;
  original_book_id: number | null;
  book: HcBook;
  edition: { id: number; isbn_13: string | null; isbn_10: string | null; asin: string | null } | null;
  user_book_reads: HcRead[];
}
export interface HcList { id: number; name: string; description: string | null; list_books: { book: HcBook }[] }

export const STATUS: Record<number, Status> = { 1: "planned", 2: "in_progress", 3: "completed", 4: "paused", 5: "dropped", 6: "none" };

export function bookHint(b: HcBook): WorkHint {
  const creators = (b.contributions ?? []).flatMap((c) => (c.author ? [{ name: c.author.name }] : []));
  const h: WorkHint = { title: b.title, mediaType: "book", externalIds: { hardcover_book: String(b.id) } };
  if (b.release_year != null) h.year = b.release_year;
  if (creators.length) h.creators = creators;
  return h;
}

function workHint(ub: HcUserBook): WorkHint {
  const h = bookHint(ub.book);
  const e = ub.edition;
  if (e) {
    h.externalIds.hardcover_edition = String(e.id);
    if (e.isbn_13) h.externalIds.isbn13 = e.isbn_13;
    if (e.isbn_10) h.externalIds.isbn10 = e.isbn_10;
    if (e.asin) h.externalIds.asin = e.asin;
  }
  const s = ub.book.book_series?.[0];
  if (s) {
    h.parent = { title: s.series.name, mediaType: "book", externalIds: { hardcover_series: String(s.series.id) } };
    if (s.position != null) h.position = { index: s.position };
  }
  return h;
}

export function* mapUserBook(ub: HcUserBook): Generator<SourceRecord> {
  const work = workHint(ub);
  const entry: EntryFields = {
    status: STATUS[ub.status_id ?? 6] ?? "none",
    rating: ub.rating == null ? null : Math.round(ub.rating * 20),
    review: ub.review_raw,
    notes: ub.private_notes,
    favorite: ub.starred === true,
  };
  const key = `ub:${ub.id}`;
  yield { kind: "entry", key, raw: ub, work, entry };
  for (const r of ub.user_book_reads) {
    yield {
      kind: "engagement",
      key: `read:${r.id}`,
      raw: r,
      work,
      engagement: {
        startedAt: parsePartialDate(r.started_at),
        finishedAt: parsePartialDate(r.finished_at),
        ...(r.progress_pages != null ? { progress: { pages: r.progress_pages } } : {}),
      },
    };
  }
  if (ub.merged_at && ub.original_book_id != null && ub.original_book_id !== ub.book.id) {
    yield {
      kind: "entry",
      key: `${key}@book:${ub.original_book_id}`,
      raw: ub,
      mergedIntoKey: key,
      work: { title: ub.book.title, mediaType: "book", externalIds: { hardcover_book: String(ub.original_book_id) } },
      entry,
    };
  }
}

export function mapList(l: HcList): SourceRecord {
  return {
    kind: "list",
    key: `list:${l.id}`,
    raw: l,
    list: {
      name: l.name,
      ...(l.description ? { description: l.description } : {}),
      items: l.list_books.map((lb) => ({ work: bookHint(lb.book) })),
    },
  };
}