/**
 * @file HTTP routes for release-update detection plus the self-applying path.
 * `POST /apply` has two modes, chosen by how this copy was installed:
 *
 * - **checkout** — fast-forward onto the newest release tag, rebuild, and
 *   restart in place (`update-check.js`'s `applyUpdate` + `self-restart.js`).
 * - **plugin** — `applyUpdate` cannot touch a `~/.claude/plugins/cache/`
 *   directory, so it refuses with `plugin_managed`; this route catches that and
 *   hands the job to the detached chain in `plugin-update.js` instead
 *   (`claude plugin marketplace update` → `claude plugin update` →
 *   `plugin-bootstrap.js --force`, which retires this server and starts the new
 *   one). Answered 200 with `mode: "plugin"`, not 409.
 *
 * Both modes reply BEFORE anything stops the process, and the request is only
 * ever a trigger: the marketplace and plugin names come from the local cache
 * path, never from the body, so there is nothing in the payload to validate.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { Router } = require("express");
const { getUpdatesStatus, applyUpdate } = require("../lib/update-check");
const { scheduleRestart } = require("../lib/self-restart");
const { schedulePluginUpdate } = require("../lib/plugin-update");

const router = Router();

router.get("/status", async (req, res) => {
  try {
    const status = await getUpdatesStatus();
    // The install folder is the host's; a developer sees versions only.
    if (require("../lib/scope").memberId(req) != null) status.repo_root = null;
    res.json(status);
  } catch (err) {
    res.status(500).json({
      error: { code: "UPDATE_STATUS_FAILED", message: err.message || String(err) },
    });
  }
});

router.post("/check", async (_req, res) => {
  try {
    const status = await getUpdatesStatus();
    try {
      const { broadcast } = require("../websocket");
      broadcast("update_status", status);
    } catch {
      // WS not initialized (e.g. in isolated tests) — safe to ignore.
    }
    res.json(status);
  } catch (err) {
    res.status(500).json({
      error: { code: "UPDATE_CHECK_FAILED", message: err.message || String(err) },
    });
  }
});

router.post("/apply", async (_req, res) => {
  try {
    const result = await applyUpdate();

    // A plugin-cache install is refused by applyUpdate on purpose (it must not
    // rewrite a directory Claude Code owns). Route it to the detached chain,
    // which pulls the new version and re-bootstraps from the NEW cache dir.
    // Only when there is genuinely something to pull — a `plugin_managed`
    // refusal with nothing newer published must stay a 409, not spawn a
    // process that would stop the server for no reason.
    if (
      !result.applied &&
      result.reason === "plugin_managed" &&
      result.update_available &&
      result.plugin_marketplace &&
      result.plugin_name &&
      result.repo_root
    ) {
      const scheduled = schedulePluginUpdate({
        marketplace: result.plugin_marketplace,
        plugin: result.plugin_name,
        root: result.repo_root,
      });
      // `applied: true` because the update IS being applied — just by the
      // plugin chain rather than by a git fast-forward. `mode` tells the client
      // which one, so it can word the progress text honestly.
      res.json({ ...result, applied: true, mode: "plugin", ...scheduled });
      return;
    }

    if (!result.applied) {
      res.status(409).json({
        ...result,
        error: {
          code: "UPDATE_NOT_APPLICABLE",
          message:
            result.reason === "up_to_date"
              ? "Already up to date."
              : result.reason === "plugin_managed"
                ? // Do not claim "nothing newer is published" unless the release
                  // lookup actually succeeded — saying so after a failed check
                  // reports an unknown as a negative, which is how a broken
                  // check looks identical to an up-to-date install.
                  result.release_check === "ok"
                  ? `This install runs from the Claude Code plugin cache and ${result.latest_release || "the published release"} is already the newest; run /agenthub-update to force a refresh.`
                  : `This install runs from the Claude Code plugin cache and the release check did not succeed (${result.release_check || "unknown"}), so there is nothing to apply; run /agenthub-update to update it by hand.`
                : "Current branch can't be fast-forwarded automatically.",
        },
      });
      return;
    }
    res.json(result);
    try {
      const { broadcast } = require("../websocket");
      broadcast("update_status", { ...result, update_available: false });
    } catch {
      // WS not initialized (e.g. in isolated tests) — safe to ignore.
    }
    // After the response above, restart onto the freshly-built code.
    setImmediate(() => scheduleRestart());
  } catch (err) {
    res.status(500).json({
      error: { code: "UPDATE_APPLY_FAILED", message: err.message || String(err) },
    });
  }
});

module.exports = router;