import PromiseRouter from "express-promise-router";

import ApiError from "@common/ApiError";
import { ErrorCode } from "@common/ErrorCode";
import { DEVICE_PREFIX } from "@common/sprinklersRpc/mqtt";
import { DeviceToken, SuperuserToken } from "@common/TokenClaims";
import { verifyToken } from "@server/authentication";
import { ServerState } from "@server/state";

export const SUPERUSER = "sprinklers3";

export function mosquitto(state: ServerState) {
  const router = PromiseRouter();

  router.post("/auth", async (req, res) => {
    const body = req.body;
    const { username, password, topic, acc } = body;
    if (typeof username !== "string" || typeof password !== "string") {
      throw new ApiError(
        "Must specify a username and password",
        ErrorCode.BadRequest
      );
    }
    if (username === SUPERUSER) {
      await verifyToken<SuperuserToken>(password, "superuser");
      return res.status(200).send({ username });
    }
    const claims = await verifyToken<DeviceToken>(password, "device");
    if (claims.aud !== username) {
      throw new ApiError("Username does not match token", ErrorCode.BadRequest);
    }
    res.status(200).send({
      username,
      id: claims.id
    });
  });

  router.post("/superuser", async (req, res) => {
    const { username } = req.body;
    if (typeof username !== "string") {
      throw new ApiError("Must specify a username", ErrorCode.BadRequest);
    }
    if (username !== SUPERUSER) {
      return res.status(403).send();
    }
    res.status(200).send();
  });

  router.post("/acl", async (req, res) => {
    const { username, topic, clientid, acc } = req.body;
    if (typeof username !== "string" || typeof topic !== "string") {
      throw new ApiError(
        "username and topic must be specified as strings",
        ErrorCode.BadRequest
      );
    }
    const prefix = DEVICE_PREFIX + "/" + username;
    if (!topic.startsWith(prefix)) {
      throw new ApiError(`device ${username} cannot access topic ${topic}`);
    }
    res.status(200).send();
  });

  return router;
}