/**
 * @file ai-routers.js (routes)
 * @description CRUD for AI Router profiles — the endpoints behind the
 * **AI Router** tab of Settings. CHOOSING a profile is not here: a new session
 * names one (`router` on `POST /api/lanes/:id/start` and `POST /api/run`).
 *
 * An edit or a delete here does reach the sessions using it: each reads the
 * profile through a file written at its spawn (`server/lib/router-apply.js`),
 * which an edit rewrites and a delete removes.
 *
 * No response on this router carries key material. `GET /` returns the store's
 * public view (`hasKey: true|false`), and there is deliberately no
 * `GET /:name` — a route that returned one profile in full would be the one
 * way an API key could leave this process.
 *
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const express = require("express");

const routers = require("../lib/ai-routers");
const { refreshProfileFiles, removeProfileFiles } = require("../lib/router-apply");
const { sameOriginGuard } = require("../lib/same-origin");

const router = express.Router();

const ERR_TO_STATUS = {
  EBADKEY: 400,
  EBADNAME: 400,
  EBADLABEL: 400,
  EBADURL: 400,
  EBADMODEL: 400,
  EBADJSON: 409,
  EBUILTIN: 409,
  ENOTFOUND: 404,
};

function fail(res, e) {
  const status = ERR_TO_STATUS[e.code] || 500;
  return res.status(status).json({ error: { code: e.code || "EINTERNAL", message: e.message } });
}

// GET /api/ai-routers — every profile, built-in `native` first. Never a key.
router.get("/", (_req, res) => {
  try {
    res.json(routers.listRouters());
  } catch (e) {
    return fail(res, e);
  }
});

// POST /api/ai-routers — body: { label, baseUrl, apiKey?, model, models? }
router.post("/", sameOriginGuard, (req, res) => {
  try {
    res.status(201).json(routers.createRouter(req.body || {}));
  } catch (e) {
    return fail(res, e);
  }
});

// POST /api/ai-routers/test — does this endpoint + key + model actually answer?
// Body: `{ baseUrl, model, apiKey?, name? }`. Registered before `/:name` for
// clarity; no collision today, since `/:name` takes no POST.
//
// A reachable router is a 200 here whatever it replies — `{ ok:false, status }`
// carries the router's own words, which is the whole point. Only bad input is
// a 4xx. The response never echoes the key, including on the path where the
// stored one was used (see `testRouter` on why that path is narrow).
router.post("/test", sameOriginGuard, async (req, res) => {
  try {
    res.json(await routers.testRouter(req.body || {}));
  } catch (e) {
    return fail(res, e);
  }
});

// PATCH /api/ai-routers/:name — same fields, all optional. An omitted `apiKey`
// keeps the stored one; the edit form cannot show a key, so it cannot echo one.
//
// A session reads the profile through a file written at its spawn, so the
// edit rewrites those files too — a rotated key reaches live Claude sessions.
router.patch("/:name", sameOriginGuard, (req, res) => {
  try {
    const saved = routers.updateRouter(req.params.name, req.body || {});
    refreshProfileFiles(saved.name);
    res.json(saved);
  } catch (e) {
    return fail(res, e);
  }
});

// DELETE /api/ai-routers/:name — and the session files that copy its key.
router.delete("/:name", sameOriginGuard, (req, res) => {
  try {
    const removed = routers.removeRouter(req.params.name);
    removeProfileFiles(req.params.name);
    res.json(removed);
  } catch (e) {
    return fail(res, e);
  }
});

module.exports = router;