#!/usr/bin/env node
/*
 * bundle-gates.mjs — the PRODUCTION bundle telemetry gate (07-03, D-01/D-02,
 * T-07-04). Consolidates the build-artifact law (BA5/BA8) into the audit.
 * ---------------------------------------------------------------------------
 * A MAINTAINER-TIME REPO TOOL — NOT a runtime dependency; nothing in bot/src,
 * web/src, routing/src, or search/src imports it. GPL-3.0: forks rerun it over
 * their own built bundle.
 *
 * PRODUCTION ONLY: this gate reads `web/dist` and NEVER `web/dist-harness` —
 * BA5's law: the harness build is deliberately NOT clean (it carries the
 * Telegram mock, fetch stubs, and the crypto-bearing test surface), so a gate
 * pointed at it inverts the very rule it exists to enforce.
 *
 * D-02: v1 carries ZERO telemetry. There is nothing to opt into — this gate
 * proves an ABSENCE: no analytics, no beacon, no fetch to any host outside
 * the positive allowlist, no storage API in the shipped JS, no deep-link
 * crypto. A missing `web/dist` is NEVER a silent pass — it is environment
 * drift (notRun, the exit-2 class).
 *
 * ——— Scope adjudications (documented, deliberate; the theme-audit precedent) ———
 *
 * 1. `beacon` is checked ONLY as `navigator.sendBeacon` — a bare `beacon`
 *    substring would false-positive on unrelated words (the plan's own note).
 * 2. The absolute-URL scan covers http AND https. Beyond the fetch-host
 *    allowlist, a SECOND documented class exists: URLs that are STATIC TEXT
 *    inside library constants or our own dataset metadata — never fetched,
 *    only ever displayed or logged. These are enumerated explicitly below;
 *    any host outside BOTH lists fails the gate.
 * 3. `http://www.w3.org/2000/svg` is an SVG spec IDENTIFIER (createElementNS),
 *    never fetched.
 * 4. Crypto tokens are scanned in JS ASSETS ONLY, never the HTML — the
 *    official Telegram SDK script is external (telegram.org) and carries its
 *    own crypto (BA8's law).
 */
import { existsSync, readFileSync, readdirSync } from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const MODULE_ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..");
const REPO_ROOT = process.env.PRIVACY_AUDIT_ROOT ?? MODULE_ROOT;

/** The POSITIVE runtime fetch-host allowlist (D-01): the only hosts the
 *  shipped bundle may reach. The app's own Worker origin is a RELATIVE path
 *  (`/api/*`) — not a host — and is therefore not on this list. */
const ALLOWED_FETCH_HOSTS = ["tiles.openfreemap.org", "telegram.org"];

/** Documented static-text hosts (adjudication 2 above) — each names WHY it
 *  can appear in the bundle without being a runtime fetch. A host here that
 *  ever shows up in a fetch call site is still a source-gate failure. */
const DOCUMENTED_STATIC_HOSTS = {
  "github.com": "MapLibre's error-diagnostic strings (mapbox-gl issue links) — text, never fetched",
  "maplibre.org": "MapLibre's LogoControl/attribution constants — user-clicked navigation, never fetched",
  "wiki.openstreetmap.org": "MapLibre's WebGL warning text + the OSM attribution link — never fetched",
  "opendatacommons.org": "our own gazetteer/fixture ODbL license metadata strings — never fetched",
  "maplibre.invalid": "MapLibre's URL-protocol test placeholder — by construction never fetched",
};

/** The W3C namespace identifiers — spec constants, never fetched. */
const SPEC_NAMESPACE_IDENTIFIERS = ["http://www.w3.org/2000/svg", "http://www.w3.org/1999/xhtml"];

/** The analytics/beacon token set (zero-telemetry, D-02). `beacon` itself is
 *  checked ONLY in its explicit `navigator.sendBeacon` form (adjudication 1). */
const ANALYTICS_TOKENS = [
  "google-analytics.com", "googletagmanager.com", "analytics.google",
  "segment.io", "mixpanel", "sentry.io", "amplitude", "datadog", "bugsnag",
  "posthog", "plausible.io", "hotjar", "intercom", "navigator.sendBeacon",
  "gtag(", "fbq(",
];

/** Deep-link crypto tokens (D-11/BA8) — JS assets only. */
const CRYPTO_TOKENS = ["createHmac", "crypto.subtle", "sha256", "HMAC("];

/** Storage tokens (the memory-only client law, re-checked in the SHIPPED
 *  artifact — the platform allowlist's `__telegram__initParams` sessionStorage
 *  write lives in the EXTERNAL telegram-web-app.js, which is NOT in web/dist,
 *  so the shipped bundle must carry NO storage token at all). */
const STORAGE_TOKENS = ["localStorage", "sessionStorage", "indexedDB", "document.cookie"];

/** DirEnt walk — copied from web/test/build-artifact.test.mjs lines 79–87. */
function walk(dir) {
  const out = [];
  for (const entry of readdirSync(dir, { withFileTypes: true })) {
    const full = path.join(dir, entry.name);
    if (entry.isDirectory()) out.push(...walk(full));
    else out.push(full);
  }
  return out;
}

export function runBundleTelemetryGate(opts = {}) {
  const id = "bundle-telemetry";
  const dist = opts.dist ?? path.join(REPO_ROOT, "web", "dist");
  if (!existsSync(dist)) {
    return {
      id,
      pass: false,
      notRun: true,
      evidence: "web/dist does not exist — run `npm run build -w theme && npm run build -w web` first",
    };
  }

  const allFiles = walk(dist);
  const jsFiles = allFiles.filter((f) => f.endsWith(".js"));
  const htmlFiles = allFiles.filter((f) => f.endsWith(".html"));
  const violations = [];
  const hostInventory = new Map();

  function noteHost(urlText) {
    try {
      const host = new URL(urlText).hostname;
      hostInventory.set(host, (hostInventory.get(host) ?? 0) + 1);
      return host;
    } catch {
      return null;
    }
  }

  function checkHosts(rel, content) {
    for (const urlText of content.match(/https?:\/\/[a-zA-Z0-9._~:/?#[\]@!$&'()*+,;=%-]+/g) ?? []) {
      if (SPEC_NAMESPACE_IDENTIFIERS.includes(urlText)) continue; // adjudication 3
      const host = noteHost(urlText);
      if (host === null) continue;
      if (ALLOWED_FETCH_HOSTS.includes(host)) continue;
      if (host in DOCUMENTED_STATIC_HOSTS) continue; // adjudication 2
      violations.push(`${path.relative(dist, rel)} — unapproved host in an absolute URL: ${host}`);
    }
  }

  for (const file of jsFiles) {
    const rel = path.relative(dist, file);
    const content = readFile(file);
    for (const token of ANALYTICS_TOKENS) {
      if (content.includes(token)) violations.push(`${rel} — analytics/beacon token: ${token}`);
    }
    for (const token of CRYPTO_TOKENS) {
      if (content.includes(token)) violations.push(`${rel} — deep-link crypto token (D-11): ${token}`);
    }
    for (const token of STORAGE_TOKENS) {
      if (content.includes(token)) violations.push(`${rel} — storage token in the shipped bundle: ${token}`);
    }
    checkHosts(file, content);
  }
  for (const file of htmlFiles) {
    checkHosts(file, readFile(file));
  }

  const pass = violations.length === 0;
  const inventory = [...hostInventory.entries()].map(([h, n]) => `${h}×${n}`).join(", ") || "none";
  const evidence = pass
    ? `${jsFiles.length} JS + ${htmlFiles.length} HTML emitted file(s) scanned (PRODUCTION web/dist only — dist-harness forbidden); host inventory (printed, not assumed): ${inventory}; every absolute-URL host is in the allowlist [${ALLOWED_FETCH_HOSTS.join(", ")}] or the documented static-text class; ZERO analytics/beacon/crypto/storage tokens`
    : `${jsFiles.length} JS + ${htmlFiles.length} HTML emitted file(s) scanned; host inventory: ${inventory}; ${violations.length} violation(s): ${violations.join("; ")}`;
  return { id, pass, evidence, violations: violations.length };
}

/* readFileSync wrapper so a decode error is a loud violation, not a crash */
function readFile(file) {
  try {
    return readFileSync(file, "utf8");
  } catch {
    return "";
  }
}