import { z } from "zod";
import superjson from "superjson";

const spotifyLink = z
  .string()
  .trim()
  .regex(
    /^(https:\/\/open\.spotify\.com\/(intl-[a-z-]+\/)?(track|playlist|album)\/[A-Za-z0-9]+(\?\S*)?|spotify:(track|playlist|album):[A-Za-z0-9]+)$/,
    "Enter a Spotify track, album or playlist link.",
  );

export const schema = z.object({
  urls: z.array(spotifyLink).min(1).max(1000),
  kind: z.enum(["track", "playlist"]),
  name: z.string().max(200).optional(),
});

export type InputType = z.infer<typeof schema>;
export type OutputType = { jobId: string };

export async function postSpotifyDownload(body: InputType): Promise<OutputType> {
  const validated = schema.parse(body);
  const response = await fetch("/_api/spotify-download", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: superjson.stringify(validated),
  });
  if (!response.ok) {
    const parsed = (await response.json().catch(() => ({}))) as { error?: string };
    throw new Error(parsed.error || "Unable to start the download.");
  }
  return superjson.parse<OutputType>(await response.text());
}