class BookImport
  def instapaper
    InstapaperClient.bookmarks(limit: 500).to_enum(:each).map { |bookmark|
      if URI(bookmark.url).host =~ /\A(www\.)?amazon\.(com|ca)/
        uri = URI(bookmark.url)
        text = client_for("#{uri.scheme}://#{uri.hostname}").get(uri.path).body
        isbn = text.match(/(ISBN|ASIN)(-13|-10)?:\s*<\/b>\s*(\w{10,13})/)
        create_record_from_isbn(isbn[3], bookmark.bookmark_id)
      elsif bookmark.url =~ /goodreads\.com/
        uri = URI(bookmark.url)
        text = client_for("#{uri.scheme}://#{uri.hostname}").get(uri.path).body
        doc = Nokogiri::HTML(text)
        create_record_from_isbn(doc.at('meta[property="books:isbn"]')["content"], bookmark.bookmark_id)
      end
    }.compact
  end

  def kindle
    books_from_highlights
  end

  private

  # TODO: Do like what we do with words, where it puts the source multiple times
  # TODO: Refactor to be consistent with Words?
  # It does work though :)
  def books_from_highlights
    sources = JSON.parse(Readwise.get("/munger").body)["data"]
    existing_books = Book.all

    sources.each do |source|
      book_highlights = source["highlights"].select { |h| h["note"] =~ /\A\.?book/i }
      book_titles = book_highlights.map { |h| h["highlight"] }
      book_titles.each do |title|
        next if title == "Randomness)." # ugh can't get rid of it
        book = Book.new("Title" => title)
        book.populate_from_goodreads(prevent_duplicates_from: existing_books)
      end
    end
  end

  def create_record_from_isbn(isbn, bookmark_id)
    Book.new("ISBN" => isbn).populate_from_goodreads
    InstapaperClient.delete_bookmark(bookmark_id)
  end

  def client_for(host)
    @clients ||= {}
    return @clients[host] if @clients[host]
    @clients[host] ||= Faraday.new(:url => host) do |b|
      b.request :retry, max: 10, interval: 1, interval_randomness: 2, backoff_factor: 2, exceptions: Semian::NetHTTP::DEFAULT_ERRORS
      b.use FaradayMiddleware::FollowRedirects
      b.adapter :net_http_persistent
      b.headers["User-Agent"] = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36"
    end
  end
end