import { Handlers } from "$fresh/server.ts";
import { json } from "@lib/helpers.ts";
import { getBookDetails } from "@lib/hardcover.ts";
import { fileExtension } from "https://deno.land/x/file_extension@v2.1.0/mod.ts";
import { formatDate, safeFileName, toUrlSafeString } from "@lib/string.ts";
import { AccessDeniedError } from "@lib/errors.ts";
import { createResource, fetchResource } from "@lib/marka/index.ts";
import { ReviewResource } from "@lib/marka/schema.ts";

export const handler: Handlers = {
  async GET(_, ctx) {
    const book = await fetchResource(`books/${ctx.params.name}`);
    return json(book?.content);
  },
  async POST(_, ctx) {
    const session = ctx.state.session;
    if (!session) throw new AccessDeniedError();

    const hardcoverId = ctx.params.name;
    if (!hardcoverId) throw new AccessDeniedError();

    const bookDetails = await getBookDetails(hardcoverId);

    if (!bookDetails) {
      throw new Error("Book not found on Hardcover");
    }

    const title = bookDetails.title || hardcoverId;
    const authorName = bookDetails.author_names?.[0] || "";
    const isbn = bookDetails.isbn13 || bookDetails.isbn || "";
    const releaseDate = bookDetails.release_year 
      ? `${bookDetails.release_year}-01-01` 
      : undefined;

    let finalPath = "";
    if (bookDetails.image) {
      try {
        const response = await fetch(bookDetails.image);
        if (response.ok) {
          const buffer = await response.arrayBuffer();
          const extension = fileExtension(bookDetails.image);
          finalPath = `books/images/${safeFileName(title)}_cover.${extension}`;
          await createResource(finalPath, buffer);
        }
      } catch {
        console.log("Failed to download book cover");
      }
    }

    const book: ReviewResource["content"] = {
      _type: "Review",
      headline: title,
      subtitle: bookDetails.subtitle,
      bookBody: bookDetails.description || "",
      link: `https://hardcover.app/books/${bookDetails.slug}`,
      image: finalPath ? `resources/${finalPath}` : undefined,
      datePublished: formatDate(releaseDate),
      author: authorName ? {
        _type: "Person",
        name: authorName,
      } : undefined,
      itemReviewed: {
        name: title,
      },
    };

    console.log("Creating book resource:", JSON.stringify(book, null, 2));

    const fileName = toUrlSafeString(title);

    await createResource(`books/${fileName}.md`, book);

    return json({ name: fileName });
  },
};