/**
 * @file ai-routers.js (routes)
 * @description CRUD for AI Router profiles — the endpoints behind the
 * **AI Router** tab of Settings. CHOOSING a profile for a lane is not here: it
 * happens once, when the lane is created (`POST /api/lanes/:id/router/apply`),
 * because the write target is the lane's own directory.
 *
 * An edit or a delete here does reach the lanes that already chose it, though.
 * Attaching COPIES the profile into the lane's own config, so a store-only
 * write would be inert exactly where it matters most — a rotated key would
 * never reach the lanes still authenticating with the revoked one.
 *
 * 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 { reapplyToLanes, detachFromLanes } = require("../lib/router-apply");
const { sameOriginGuard } = require("../lib/same-origin");

const router = express.Router();

const ERR_TO_STATUS = {
  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);
  }
});

// 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.
//
// Attaching COPIES a profile into the lane's own config, so an edit that only
// wrote the store here would be inert: rotating a leaked key would leave every
// claude lane on the revoked one. `reapplyToLanes` pushes the change out, and
// reports per-lane failures instead of failing the edit.
router.patch("/:name", sameOriginGuard, (req, res) => {
  try {
    const saved = routers.updateRouter(req.params.name, req.body || {});
    res.json({ ...saved, lanes: reapplyToLanes(saved.name) });
  } catch (e) {
    return fail(res, e);
  }
});

// DELETE /api/ai-routers/:name — every lane using it is reset to native, in its
// config on disk as well as in the DB. Leaving the lanes alone would keep the
// deleted router's key and base URL live in each claude lane's settings file.
router.delete("/:name", sameOriginGuard, (req, res) => {
  try {
    const removed = routers.removeRouter(req.params.name);
    res.json({ ...removed, lanes: detachFromLanes(req.params.name) });
  } catch (e) {
    return fail(res, e);
  }
});

module.exports = router;