import superjson from "superjson";
import { schema, type OutputType } from "./spotify-exchange_POST.schema";
import {
  appendSetCookies,
  clearCookie,
  exchangeSpotifyCode,
  makeCookie,
  parseCookies,
} from "../helpers/spotifyServer";

type SpotifyProfile = {
  id: string;
  display_name?: string;
  email?: string;
  product?: string;
  images?: Array<{ url?: string }>;
};

export async function handle(request: Request) {
  try {
    const body = schema.parse(superjson.parse(await request.text()));
    const cookies = parseCookies(request);
    if (!cookies.spotirip_oauth_state || cookies.spotirip_oauth_state !== body.state) {
      return new Response(superjson.stringify({ error: "Spotify login state did not match. Please try connecting again." }), { status: 400 });
    }

    const token = await exchangeSpotifyCode(body.code);
    if (!token.refresh_token) {
      return new Response(superjson.stringify({ error: "Spotify did not return a refresh token. Reconnect your account." }), { status: 400 });
    }

    const profileResponse = await fetch("https://api.spotify.com/v1/me", {
      headers: { Authorization: `Bearer ${token.access_token}` },
    });
    if (!profileResponse.ok) {
      return new Response(superjson.stringify({ error: "Spotify login succeeded, but the user profile could not be read." }), { status: 502 });
    }
    const profile = (await profileResponse.json()) as SpotifyProfile;
    const expiresAt = Date.now() + token.expires_in * 1000;

    const headers = new Headers({ "Content-Type": "application/json", "Cache-Control": "no-store" });
    appendSetCookies(headers, [
      makeCookie("spotirip_spotify_access", token.access_token, { maxAge: token.expires_in }),
      makeCookie("spotirip_spotify_refresh", token.refresh_token, { maxAge: 60 * 60 * 24 * 30 }),
      makeCookie("spotirip_spotify_expires", String(expiresAt), { maxAge: token.expires_in }),
      clearCookie("spotirip_oauth_state"),
    ]);

    const output: OutputType = {
      connected: true,
      desktop: process.env.SPOTIRIP_DESKTOP === "1" || undefined,
      profile: {
        id: profile.id,
        displayName: profile.display_name || profile.id,
        email: profile.email,
        imageUrl: profile.images?.find((image) => image.url)?.url,
        product: profile.product,
      },
    };
    return new Response(superjson.stringify(output), { headers });
  } catch (error) {
    const message = error instanceof Error ? error.message : "Spotify login failed.";
    return new Response(superjson.stringify({ error: message }), { status: 400 });
  }
}