import { Hono } from "hono";

import { MeResponseSchema } from "@/worker/openapi/schemas";
import { describeJson } from "@/worker/routes/api/openapi";
import { subjectForSession } from "@/worker/routes/api/session";
import type { AppContext, AppEnv } from "@/worker/types";

function controlPlaneBaseUrl(c: AppContext): URL {
  const url = new URL(c.req.url);
  url.pathname = "/";
  url.search = "";
  url.hash = "";
  return url;
}

export async function meBody(c: AppContext) {
  const subject = await subjectForSession(c);
  if (!subject) throw new Error("Authenticated subject not found");
  const base = controlPlaneBaseUrl(c);
  const protocol = base.protocol;
  const controlHost = c.env.CONTROL_PLANE_HOST;
  const davHost = `${subject.hostLabel}${c.env.SUBJECT_HOST_SUFFIX}`;
  return {
    subject_id: subject.id,
    host_label: subject.hostLabel,
    control_plane_host: controlHost,
    dav_host: davHost,
    urls: {
      api: `${protocol}//${controlHost}/api/v1/`,
      root: `${protocol}//${davHost}/`,
      files: `${protocol}//${davHost}/files/`,
      caldav: `${protocol}//${davHost}/calendars/`,
      carddav: `${protocol}//${davHost}/addressbooks/`,
    },
  };
}

export function createMeApiRoutes(): Hono<AppEnv> {
  const api = new Hono<AppEnv>();
  api.get("/", describeJson("Get current subject metadata", "me", MeResponseSchema), async (c) =>
    c.json(await meBody(c)),
  );
  return api;
}