import { jwtVerify } from "jose";
import { z } from "zod";
import {
  TokenPayload,
  TokenPayloadSchema,
  UserMeResponse,
  UserMeResponseSchema,
} from "../core/ApiSchemas";
import { ServerConfig } from "../core/configuration/Config";
import { PersistentIdSchema } from "../core/Schemas";

type TokenVerificationResult =
  | {
      persistentId: string;
      claims: TokenPayload | null;
    }
  | false;

export async function verifyClientToken(
  token: string,
  config: ServerConfig,
): Promise<TokenVerificationResult> {
  if (PersistentIdSchema.safeParse(token).success) {
    // eslint-disable-next-line sort-keys
    return { persistentId: token, claims: null };
  }
  try {
    const issuer = config.jwtIssuer();
    const audience = config.jwtAudience();
    const key = await config.jwkPublicKey();
    const { payload, protectedHeader } = await jwtVerify(token, key, {
      algorithms: ["EdDSA"],
      audience,
      issuer,
    });
    const result = TokenPayloadSchema.safeParse(payload);
    if (!result.success) {
      const error = z.prettifyError(result.error);
      console.warn("Error parsing token payload", error);
      return false;
    }
    const claims = result.data;
    const persistentId = claims.sub;
    return { claims, persistentId };
  } catch (e) {
    return false;
  }
}

export async function getUserMe(
  token: string,
  config: ServerConfig,
): Promise<UserMeResponse | false> {
  try {
    // Get the user object
    const response = await fetch(config.jwtIssuer() + "/users/@me", {
      headers: {
        authorization: `Bearer ${token}`,
      },
    });
    if (response.status !== 200) return false;
    const body = await response.json();
    const result = UserMeResponseSchema.safeParse(body);
    if (!result.success) {
      console.error(
        "Invalid response",
        JSON.stringify(body),
        JSON.stringify(result.error),
      );
      return false;
    }
    return result.data;
  } catch (e) {
    return false;
  }
}