#!/usr/bin/env node
/**
 * @file plugin-doctor.js
 * @description Reports the health of a plugin-installed AgentHub: Node version,
 * npm, free disk on the data dir, bootstrap state, runtime dependencies (every
 * declared package, not just that node_modules exists), server liveness,
 * duplicate hook entries (the one failure that silently doubles every token and
 * cost figure), the `agenthub` CLI launcher and its PATH, whether the slash
 * commands the pipeline templates name as node drivers are actually resolvable
 * (the `superpowers` plugin, today), and the dashboard bundle — quoting the last
 * build error when it is missing.
 * Read-only — it diagnoses, it never repairs.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const fs = require("fs");
const os = require("os");
const path = require("path");
const { spawnSync } = require("child_process");

const boot = require("./plugin-bootstrap");
const { getSettingsPath, getDataDir } = require("../server/lib/claude-home");

const PLUGIN_ROOT = path.resolve(__dirname, "..");

/** @returns {{level:"ok"|"warn"|"fail", label:string, detail:string}[]} */
function diagnose() {
  const rt = boot.runtimeDir();
  const out = [];
  const add = (level, label, detail) => out.push({ level, label, detail });

  add(
    boot.nodeVersionOk() ? "ok" : "fail",
    "Node",
    boot.nodeVersionOk()
      ? `v${process.versions.node}`
      : `v${process.versions.node} — AgentHub needs >= ${boot.MIN_NODE.join(".")} (node:sqlite)`
  );

  add("ok", "Plugin root", PLUGIN_ROOT);
  add("ok", "Data dir", getDataDir());

  const state = boot.readState(rt);
  if (!state) {
    add(
      "warn",
      "Bootstrap",
      `no state recorded — start a new session, or check ${rt}/bootstrap.log`
    );
  } else {
    const moved = state.pluginRoot !== PLUGIN_ROOT;
    add(
      moved ? "warn" : "ok",
      "Bootstrap",
      moved
        ? `recorded against a previous plugin version (${state.pluginRoot}) — run /agenthub-update`
        : `last run ${state.updatedAt}`
    );
  }

  add(...runtimeDepsStatus(rt));
  add(...npmStatus());
  add(...diskStatus());

  const live = boot.liveServers();
  add(
    live.length ? "ok" : "fail",
    "Server",
    live.length
      ? `listening on ${live.map((s) => `http://localhost:${s.port}`).join(", ")}`
      : `not running — see ${path.join(rt, "server.log")}`
  );

  const dup = countLegacyHookEntries();
  add(
    dup ? "fail" : "ok",
    "Hooks",
    dup
      ? `${dup} entr${dup === 1 ? "y" : "ies"} in ${getSettingsPath()} duplicate the plugin's hooks — ` +
          `every event is counted twice. Remove them (a new session does it automatically).`
      : "provided by the plugin only"
  );

  add(...cliStatus());
  add(...skillPluginStatus());

  add(...dashboardUiStatus(rt));

  return out;
}

/**
 * `node_modules` existing proves nothing: an interrupted install or a truncated
 * cache entry leaves a directory that npm reports as installed and that is
 * missing packages — the failure mode that took the client build down with
 * TS2318. Check every declared runtime dependency actually landed.
 *
 * Only `dependencies` count. `optionalDependencies` (better-sqlite3) are allowed
 * to be absent by design — the server falls back to `node:sqlite`.
 */
function runtimeDepsStatus(rt) {
  const nm = path.join(rt, "node_modules");
  if (!fs.existsSync(nm)) return ["fail", "Runtime deps", "missing — run /agenthub-update"];

  let declared;
  try {
    declared = Object.keys(
      JSON.parse(fs.readFileSync(path.join(rt, "package.json"), "utf8")).dependencies || {}
    );
  } catch {
    return ["warn", "Runtime deps", `${nm} — no manifest beside it, cannot verify the tree`];
  }

  const missing = declared.filter((d) => !fs.existsSync(path.join(nm, d, "package.json")));
  if (missing.length) {
    return [
      "fail",
      "Runtime deps",
      `${missing.join(", ")} declared but not installed — the tree is incomplete. ` +
        `Delete ${nm} and run /agenthub-update`,
    ];
  }
  return ["ok", "Runtime deps", `${declared.length} packages in ${nm}`];
}

/** No npm, no dashboard bundle and no runtime install — both go through it. */
function npmStatus() {
  const res = spawnSync(process.platform === "win32" ? "npm.cmd" : "npm", ["-v"], {
    encoding: "utf8",
    shell: process.platform === "win32",
  });
  if (res.status !== 0) {
    return ["fail", "npm", "not runnable — the runtime install and the UI build both need it"];
  }
  return ["ok", "npm", `v${res.stdout.trim()}`];
}

/**
 * A full disk is the quiet cause of half-written installs and a SQLite file that
 * refuses writes, and it reads as unrelated breakage everywhere else.
 */
function diskStatus() {
  const dir = getDataDir();
  let free;
  try {
    const s = fs.statfsSync(dir);
    free = s.bavail * s.bsize;
  } catch {
    return ["ok", "Disk", "not measurable on this platform"];
  }
  const mb = Math.round(free / 1024 / 1024);
  if (free < 200 * 1024 * 1024) {
    return ["fail", "Disk", `${mb} MB free on ${dir} — installs and the database will truncate`];
  }
  if (free < 1024 * 1024 * 1024) return ["warn", "Disk", `${mb} MB free on ${dir}`];
  return ["ok", "Disk", `${Math.round(mb / 1024)} GB free`];
}

/**
 * When the bundle is missing the useful thing is not "run /agenthub-open" — it
 * is why the last build failed, which sits in `client-build.log` and which
 * nobody thinks to open.
 */
function dashboardUiStatus(rt) {
  const dist = process.env.DASHBOARD_CLIENT_DIST || path.join(rt, "client-dist");
  if (fs.existsSync(path.join(dist, "index.html"))) return ["ok", "Dashboard UI", dist];

  const err = lastBuildError(path.join(rt, "client-build.log"));
  return [
    "warn",
    "Dashboard UI",
    err
      ? `not built — the last build failed with: ${err} (full log: ${path.join(rt, "client-build.log")})`
      : "not built yet — run /agenthub-open",
  ];
}

/** First compiler/npm error line of the log's last build, or null. */
function lastBuildError(logPath) {
  let lines;
  try {
    lines = fs.readFileSync(logPath, "utf8").split("\n");
  } catch {
    return null;
  }
  const hit = lines.filter((l) => /\berror\b|npm ERR!/i.test(l)).pop();
  return hit ? hit.trim().slice(0, 200) : null;
}

/**
 * WARN (never FAIL) when a plugin the pipelines depend on cannot be resolved:
 * the dashboard, hooks and CLI all work without it — only the pipeline
 * skills that drive it stop partway, so this must not fail a doctor run.
 *
 * The requirement derivation and the missing/satisfied rules live in
 * `server/lib/skill-plugins.js`, shared with the bootstrap that installs them.
 */
function skillPluginStatus() {
  const skillPlugins = require("../server/lib/skill-plugins");
  const required = skillPlugins.requiredSkillPlugins();
  if (!required.size) return ["ok", "Skill plugins", "no pipeline names an external plugin"];

  let missing;
  try {
    missing = skillPlugins.missingSkillPlugins();
  } catch {
    return ["warn", "Skill plugins", "could not read the installed-plugin manifest"];
  }
  if (!missing.length) {
    return ["ok", "Skill plugins", `${[...required.keys()].sort().join(", ")} available`];
  }
  return [
    "warn",
    "Skill plugins",
    `${missing.map((m) => `${m.name} (needed for ${m.skills.join(", ")})`).join("; ")} — ` +
      `the pipelines name these commands; install with ` +
      `claude plugin install ${missing.map((m) => m.autoInstall?.spec || m.name).join(" ")}`,
  ];
}

function countLegacyHookEntries() {
  try {
    const settings = JSON.parse(fs.readFileSync(getSettingsPath(), "utf8"));
    if (!settings.hooks) return 0;
    const isLegacy = boot.isCheckoutHookEntry();
    return Object.values(settings.hooks)
      .filter(Array.isArray)
      .reduce((n, entries) => n + entries.filter(isLegacy).length, 0);
  } catch {
    return 0;
  }
}

function cliStatus() {
  const dir = path.join(os.homedir(), ".local", "bin");
  const file = path.join(dir, process.platform === "win32" ? "agenthub.cmd" : "agenthub");
  if (!fs.existsSync(file)) return ["warn", "agenthub CLI", `no launcher at ${file}`];
  const onPath = (process.env.PATH || "")
    .split(path.delimiter)
    .some((p) => path.resolve(p) === path.resolve(dir));
  return onPath
    ? ["ok", "agenthub CLI", file]
    : [
        "warn",
        "agenthub CLI",
        `${file} exists but ${dir} is not on PATH — add: export PATH="${dir}:$PATH"`,
      ];
}

function report() {
  const marks = { ok: "OK  ", warn: "WARN", fail: "FAIL" };
  const rows = diagnose();
  for (const r of rows) console.log(`${marks[r.level]}  ${r.label.padEnd(14)} ${r.detail}`);
  return rows.some((r) => r.level === "fail") ? 1 : 0;
}

if (require.main === module) process.exitCode = report();

module.exports = { diagnose, report, countLegacyHookEntries };