import { parseString } from 'xml2js'
import fetch from '../lib/fetchWithTimeout'

// this insane bullshit is 100% goodreads fault. also what `xml2js` spits out.
interface BookResponse {
  book: [
    {
      title: string[]
      authors: [
        {
          author: [
            {
              name: string[]
            }
          ]
        }
      ]
    }
  ]
}

const getBooks = async (): Promise<Book[]> => {
  const uri = `https://www.goodreads.com/review/list?v=2&id=${process.env.GOODREADS_ID}&shelf=currently-reading&key=${process.env.GOODREADS_KEY}`

  const response = await fetch(uri)
  const data = await response.text()

  const books: Book[] = []

  parseString(data, { normalizeTags: true }, (error, result) => {
    if (error) {
      throw new Error(error.message)
    }

    if (!result.goodreadsresponse) {
      throw new Error(`Goodreads responded without a response object`)
    }

    result.goodreadsresponse.reviews[0].review.forEach((book: BookResponse) => {
      const name = book.book[0].title[0]
      const author = book.book[0].authors[0].author[0].name[0]
      books.push({ name, author })
    })
  })

  return books
}

export interface Book {
  readonly name: string
  readonly author: string
}

export default getBooks