#!/usr/bin/env node
// SPDX-License-Identifier: MIT
// `npx ruview` — the RuView WiFi-sensing operator harness (minted via metaharness,
// hardened per ADR-182). Plain ESM, no build step: ships and runs as-is.
//
// The `ruview.*` tools (onboard/verify/claim-check/…) are PURE Node and run with
// zero deps. The kernel + host adapter are only touched by `doctor`/`install`
// (the harness-into-a-repo story), so the operator tools never block on a wasm load.

import { fileURLToPath } from 'node:url';
import { realpathSync, existsSync, readdirSync, readFileSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { argv } from 'node:process';
import { TOOLS, runTool, listTools } from '../src/tools.js';
import { claimCheck, summarize } from '../src/guardrails.js';

const NAME = 'ruview';
const ROOT = dirname(dirname(fileURLToPath(import.meta.url)));
const SKILLS_DIR = join(ROOT, 'skills');

// Map friendly CLI verbs → registry tool names.
const VERB_TO_TOOL = {
  onboard: 'ruview.onboard',
  verify: 'ruview.verify',
  'claim-check': 'ruview.claim_check',
  calibrate: 'ruview.calibrate',
  monitor: 'ruview.node_monitor',
  flash: 'ruview.node_flash',
};

function pjson(o) { console.log(JSON.stringify(o, null, 2)); }

function listSkills() {
  if (!existsSync(SKILLS_DIR)) return [];
  return readdirSync(SKILLS_DIR).filter((f) => f.endsWith('.md')).map((f) => f.replace(/\.md$/, ''));
}

async function doctor() {
  const checks = [];
  // Tools layer (always available, no deps).
  checks.push(['tool registry loads', Object.keys(TOOLS).length > 0]);
  checks.push(['claim_check flags a 100% claim',
    !claimCheck('We hit 100% accuracy on poses.').ok]);
  checks.push(['claim_check passes a tagged MEASURED claim',
    claimCheck('Held-out PCK@20 59.5% (MEASURED vs mean-pose baseline, verify.py).').ok]);
  checks.push(['skills present', listSkills().length > 0]);
  // Kernel + host adapter (optional — only needed to install into a repo).
  let kernelLine = 'kernel/host: not installed (ok — operator tools run without them)';
  try {
    const { loadKernel } = await import('@metaharness/kernel');
    const adapter = (await import('@metaharness/host-claude-code')).default;
    const k = await loadKernel();
    const info = k.kernelInfo();
    checks.push(['kernel loads + reports version', typeof info.version === 'string' && info.version.length > 0]);
    checks.push(['kernel backend is native|wasm|js', ['native', 'wasm', 'js'].includes(k.backend)]);
    checks.push(['host adapter resolves', typeof adapter?.name === 'string']);
    kernelLine = `kernel ${info.version} (${k.backend}) · host ${adapter.name}`;
  } catch {
    /* kernel not installed — fine for the tools-only path */
  }
  let ok = true;
  for (const [label, pass] of checks) { console.log(`${pass ? 'PASS' : 'FAIL'} ${label}`); if (!pass) ok = false; }
  console.log(`\n${NAME}: ${ok ? 'all checks passed' : 'doctor found problems'} — ${kernelLine}`);
  return ok ? 0 : 1;
}

function help() {
  console.log(`Usage: ${NAME} <command> [options]

Operator tools:
  onboard [--path docker-demo|repo-build|live-esp32]   pick a setup path
  verify [--repo <dir>]                                 run the deterministic proof (VERDICT: PASS)
  claim-check --text "..."  |  --file <path>            lint accuracy claims (the honesty guardrail)
  calibrate --step baseline|enroll|train-room|room-watch
  monitor --port COM8 [--seconds 12]                    assert CSI is flowing on a node
  flash --port COM8 --variant s3-8mb [--confirm]        build+flash firmware (Windows/ESP-IDF)

Harness:
  doctor                 verify the install (tools + optional kernel/host)
  skills                 list bundled skills
  skill <name>           print a skill playbook
  mcp start              run the ruview.* MCP server (stdio)
  install --host <h>     project the harness config into the current repo
  --version | --help

Hosts: claude-code, codex, opencode, copilot, pi-dev, hermes, rvm, github-actions`);
  return 0;
}

/** tiny flag parser: --k v / --k=v / --flag (boolean) */
function parseFlags(rest) {
  const f = {};
  for (let i = 0; i < rest.length; i++) {
    const a = rest[i];
    if (a.startsWith('--')) {
      const eq = a.indexOf('=');
      if (eq !== -1) { f[a.slice(2, eq)] = a.slice(eq + 1); }
      else if (i + 1 < rest.length && !rest[i + 1].startsWith('--')) { f[a.slice(2)] = rest[++i]; }
      else { f[a.slice(2)] = true; }
    }
  }
  return f;
}

export async function run(args) {
  const cmd = args[0] ?? 'onboard';
  const rest = args.slice(1);
  const flags = parseFlags(rest);

  // Direct tool verbs.
  if (VERB_TO_TOOL[cmd]) {
    const toolArgs = { ...flags };
    if (cmd === 'claim-check') {
      if (flags.file) toolArgs.text = readFileSync(flags.file, 'utf8');
      const res = runTool('ruview.claim_check', toolArgs);
      pjson(res);
      return res.ok ? 0 : 1;
    }
    if (cmd === 'monitor' && flags.seconds) toolArgs.seconds = Number(flags.seconds);
    if (cmd === 'calibrate' && typeof flags.args === 'string') toolArgs.args = flags.args.split(',');
    const res = runTool(VERB_TO_TOOL[cmd], toolArgs);
    pjson(res);
    return res.ok ? 0 : 1;
  }

  switch (cmd) {
    case 'doctor': return doctor();
    case 'skills': console.log(listSkills().join('\n') || '(none)'); return 0;
    case 'skill': {
      const n = rest[0];
      const p = n && join(SKILLS_DIR, `${n}.md`);
      if (!p || !existsSync(p)) { console.error(`No skill "${n}". Try: ${listSkills().join(', ')}`); return 2; }
      console.log(readFileSync(p, 'utf8'));
      return 0;
    }
    case 'mcp': {
      if (rest[0] === 'start' || rest[0] === undefined) {
        const { startMcpServer } = await import('../src/mcp-server.js');
        startMcpServer();
        return new Promise(() => {}); // run until stdin closes
      }
      console.error('Usage: ruview mcp start'); return 2;
    }
    case 'install': {
      const host = flags.host || 'claude-code';
      try {
        const adapter = (await import('@metaharness/host-claude-code')).default;
        console.log(`Projecting RuView harness for host "${host}" via ${adapter.name}.`);
        console.log('Add to your host config — MCP server command: npx -y ruview mcp start');
        console.log('Skills:', listSkills().join(', '));
        return 0;
      } catch {
        console.error('Host adapter not installed. `npm i @metaharness/host-claude-code` or use the bundled .claude/ config.');
        return 1;
      }
    }
    case 'tools': pjson(listTools()); return 0;
    case '--version': case '-v': {
      const pkg = JSON.parse(readFileSync(join(ROOT, 'package.json'), 'utf8'));
      console.log(pkg.version); return 0;
    }
    case '--help': case '-h': return help();
    default:
      console.error(`Unknown command: ${cmd}. Try \`${NAME} --help\`.`);
      return 2;
  }
}

// CLI guard: run only when invoked directly (realpath both sides — npm/npx shims
// pass a non-normalized, possibly case-skewed argv[1] on Windows).
const invokedDirectly = (() => {
  if (!argv[1]) return false;
  try {
    const a = realpathSync(argv[1]);
    const b = realpathSync(fileURLToPath(import.meta.url));
    return process.platform === 'win32' ? a.toLowerCase() === b.toLowerCase() : a === b;
  } catch { return false; }
})();
if (invokedDirectly) {
  run(argv.slice(2)).then((code) => process.exit(code)).catch((err) => { console.error(err); process.exit(1); });
}