#!/usr/bin/env node
/**
 * @file Detached helper that performs a full plugin-cache update end to end, so
 * the dashboard's "Update now" button works for an install running out of
 * `~/.claude/plugins/cache/`. Spawned by `server/lib/plugin-update.js` after the
 * HTTP response is written, because step 3 SIGTERMs the very server that asked
 * for the update — an in-process version would kill itself mid-flight.
 *
 * The three steps:
 *   1. `claude plugin marketplace update <marketplace>`
 *   2. `claude plugin update <plugin>@<marketplace> -y`  → new cache dir appears
 *   3. `node <newRoot>/scripts/plugin-bootstrap.js --force` → stops the old
 *      server, waits for the ports, installs deps and starts the new one
 *
 * Step 3 is what makes `/reload-plugins` unnecessary here: `plugin-bootstrap.js`
 * derives its own `PLUGIN_ROOT` from `__dirname`, not from `${CLAUDE_PLUGIN_ROOT}`,
 * so running it out of the NEW cache directory is enough to move the dashboard
 * onto the new code. `/reload-plugins` remains needed only for an interactive
 * Claude Code session to pick up new skills/commands/hooks — a thing no
 * background process can do on that session's behalf.
 *
 * Every outcome, including failure, is recorded in `plugin-update.json` under the
 * runtime directory (outside the plugin cache, so it survives the swap) and the
 * new server reports it back as `last_plugin_update`. Without that, a failed
 * chain would look identical to a slow one: the tab would poll a server that
 * never comes back and say nothing about why.
 *
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const fs = require("fs");
const { rotateIfLarge } = require("./log-rotate");
const path = require("path");
const { execFileSync, spawnSync } = require("child_process");

const [, , marketplace, plugin, oldRoot, runtimeDirArg] = process.argv;

const RESULT_FILE = path.join(runtimeDirArg, "plugin-update.json");
const LOG_FILE = path.join(runtimeDirArg, "plugin-update.log");

// Names come from the local cache PATH, never from an HTTP body, but they still
// reach an argv — so they are re-validated here rather than trusted across the
// process boundary. Anything else is a bug or tampering, and either way this
// helper must not run.
const SAFE_NAME = /^[A-Za-z0-9][\w.-]*$/;

function log(line) {
  try {
    rotateIfLarge(LOG_FILE);
    fs.appendFileSync(LOG_FILE, `[${new Date().toISOString()}] ${line}\n`);
  } catch {
    /* best effort */
  }
}

function record(result) {
  try {
    fs.mkdirSync(runtimeDirArg, { recursive: true });
    fs.writeFileSync(
      RESULT_FILE,
      JSON.stringify({ ...result, finished_at: new Date().toISOString() }, null, 2)
    );
  } catch {
    /* best effort */
  }
}

/** Resolve the `claude` CLI. The server is started detached from a hook, so its
 *  PATH is not the user's login shell PATH — check the documented install
 *  location before giving up. */
function resolveClaude() {
  const candidates = ["claude", path.join(require("os").homedir(), ".local", "bin", "claude")];
  for (const cmd of candidates) {
    const probe = spawnSync(cmd, ["--version"], { stdio: "ignore", timeout: 20_000 });
    if (!probe.error && probe.status === 0) return cmd;
  }
  return null;
}

/** Newest cache directory for this plugin, excluding `exclude`. */
function findNewRoot(exclude) {
  const base = path.join(
    require("os").homedir(),
    ".claude",
    "plugins",
    "cache",
    marketplace,
    plugin
  );
  let entries;
  try {
    entries = fs.readdirSync(base, { withFileTypes: true }).filter((e) => e.isDirectory());
  } catch {
    return null;
  }
  const candidates = entries
    .map((e) => path.join(base, e.name))
    .filter((p) => p !== exclude)
    // A cache directory without the bootstrap script is not a usable root.
    .filter((p) => fs.existsSync(path.join(p, "scripts", "plugin-bootstrap.js")))
    .map((p) => ({ p, mtime: fs.statSync(p).mtimeMs }))
    .sort((a, b) => b.mtime - a.mtime);
  return candidates.length ? candidates[0].p : null;
}

function run(cmd, args, timeout) {
  try {
    return runOnce(cmd, args, timeout);
  } catch (err) {
    // An older Claude Code rejects `-y` ("unknown option") and never prompts,
    // so the same command without the flag is the right retry.
    if (!args.includes("-y") || !/unknown option '-y'/.test(String(err.stderr || ""))) throw err;
    return runOnce(
      cmd,
      args.filter((a) => a !== "-y"),
      timeout
    );
  }
}

function runOnce(cmd, args, timeout) {
  log(`$ ${cmd} ${args.join(" ")}`);
  const out = execFileSync(cmd, args, {
    encoding: "utf8",
    timeout,
    maxBuffer: 10_000_000,
    stdio: ["ignore", "pipe", "pipe"],
  });
  if (out) log(out.trim().slice(0, 4000));
  return out;
}

function main() {
  if (!SAFE_NAME.test(marketplace || "") || !SAFE_NAME.test(plugin || "")) {
    record({ ok: false, step: "validate", error: "unsafe marketplace or plugin name" });
    return;
  }

  const claude = resolveClaude();
  if (!claude) {
    record({
      ok: false,
      step: "resolve_claude",
      error: "the `claude` CLI is not on this server's PATH; run /agenthub-update instead",
    });
    return;
  }

  try {
    run(claude, ["plugin", "marketplace", "update", marketplace], 300_000);
  } catch (err) {
    record({ ok: false, step: "marketplace_update", error: String(err.stderr || err.message) });
    return;
  }

  try {
    run(claude, ["plugin", "update", `${plugin}@${marketplace}`, "-y"], 600_000);
  } catch (err) {
    record({ ok: false, step: "plugin_update", error: String(err.stderr || err.message) });
    return;
  }

  // Claude Code's own install record first: newest-mtime is only a guess, and a
  // build installed from a terminal while this server kept running is exactly
  // the one to hand over to, whether or not this chain pulled anything.
  const newRoot = require("./plugin-bootstrap").supersededBy(oldRoot) || findNewRoot(oldRoot);
  if (!newRoot) {
    // Already newest: the marketplace had nothing to pull. Not a failure — the
    // old server is still running and untouched, so say so plainly.
    record({
      ok: true,
      step: "already_current",
      note: "no new plugin version appeared; the running server was left alone",
      plugin_root: oldRoot,
    });
    return;
  }

  log(`new plugin root: ${newRoot}`);
  // Write the verdict BEFORE the handover, not only after it. The step below
  // retires the process tree this helper hangs off, and an observed run reached
  // the new server with no verdict file at all — so the dashboard reported
  // `last_plugin_update: null` for an update that had in fact succeeded. A
  // pre-written record is overwritten by the real outcome when this survives,
  // and is the outcome when it does not.
  record({
    ok: true,
    step: "bootstrap",
    plugin_root: newRoot,
    note: "the new plugin version is installed; the server is being handed over",
  });
  try {
    // Foreground and blocking: this stops the old server (us), waits for the
    // ports, then starts the new one. It must finish before we record success.
    run(
      process.execPath,
      [path.join(newRoot, "scripts", "plugin-bootstrap.js"), "--force"],
      900_000
    );
  } catch (err) {
    record({
      ok: false,
      step: "bootstrap",
      error: String(err.stderr || err.message),
      plugin_root: newRoot,
      note: "the old server was stopped; run /agenthub-update to recover",
    });
    return;
  }

  record({ ok: true, step: "done", plugin_root: newRoot });
}

try {
  main();
} catch (err) {
  // A helper that dies without a verdict is the failure mode this file exists
  // to prevent, so even an unexpected throw gets recorded.
  record({ ok: false, step: "unexpected", error: err.message || String(err) });
}