import fs from "fs";
import path from "path";
import "dotenv/config";
 
const isbn = process.argv[2];
 
if (!isbn) {
  console.error("ISBNを指定してください");
  process.exit(1);
}
 
const API_KEY = process.env.GOOGLE_BOOKS_API_KEY;
 
const fetchWithRetry = async (url, retries = 5) => {
  for (let i = 0; i < retries; i++) {
    const res = await fetch(url);
 
    if (res.status !== 429) return res;
 
    const wait = 2 ** i * 500;
    console.log(`429 → ${wait}ms 待機`);
    await new Promise((r) => setTimeout(r, wait));
  }
 
  throw new Error("429: Retry上限に到達");
};
 
const fetchBook = async () => {
  const googleRes = await fetchWithRetry(
    `https://www.googleapis.com/books/v1/volumes?q=isbn:${isbn}&country=JP&key=${API_KEY}`,
  );
  const googleJson = await googleRes.json();
 
  if (!googleJson.items?.length) {
    throw new Error("書籍情報が見つかりません");
  }
 
  const v = googleJson.items[0].volumeInfo;
 
  return {
    title: v.title,
    subtitle: v.subtitle || "",
    authors: v.authors || [],
    publisher: v.publisher || "",
    publishedDate: v.publishedDate || "",
    description: v.description || "",
    isbn,
    image: v.imageLinks?.thumbnail || "",
    createdAt: new Date(),
  };
};
 
(async () => {
  const book = await fetchBook();
 
  const frontmatter = `---
isbn: "${book.isbn}"
title: "${book.title}"
subtitle: "${book.subtitle}"
authors:
${book.authors.map((a) => `  - "${a}"`).join("\n")}
publisher: "${book.publisher}"
publishedDate: "${book.publishedDate}"
description: "${book.description.replace(/"/g, '\\"')}"
image: "${book.image}"
category: ""
amazonLink: ""
createdAt: ${book.createdAt.toISOString()}
---
`;
 
  const fileName = `${book.isbn}.mdx`;
  const outputPath = path.resolve("src/content/book", fileName);
 
  fs.writeFileSync(outputPath, frontmatter);
  console.log(`✔ 作成完了: ${outputPath}`);
})();