#!/usr/bin/env node
/**
 * cli.js — Arboricx JS host shell via libarboricx C ABI.
 *
 * Usage:
 *   node cli.js inspect <bundle.arboricx>
 *   node cli.js run <bundle.arboricx> [args...]
 */

import { readFileSync } from 'node:fs';
import {
  init,
  free,
  loadBundleDefault,
  reduce,
  app,
  ofNumber,
  ofString,
  decode,
  decodeType,
  findLib,
} from './lib.js';

// ── Commands ─────────────────────────────────────────────────────────────────

function cmdInspect(bundlePath) {
  const ctx = init();
  try {
    const bundle = readFileSync(bundlePath);
    console.log(`Bundle: ${bundlePath}`);
    console.log(`Size: ${bundle.length} bytes\n`);

    const term = loadBundleDefault(ctx, bundle);
    const result = reduce(ctx, term);

    const type = decodeType(ctx, result);
    let value;
    try {
      value = decode(ctx, result);
    } catch {
      value = '(raw tree)';
    }

    console.log(`Type: ${type}`);
    console.log(`Value: ${value}`);
  } catch (e) {
    console.error(`Error: ${e.message}`);
    process.exit(1);
  } finally {
    free(ctx);
  }
}

function cmdRun(bundlePath, args) {
  const ctx = init();
  try {
    const bundle = readFileSync(bundlePath);
    let term = loadBundleDefault(ctx, bundle);

    for (const arg of args) {
      const argTree = /^\d+$/.test(arg) ? ofNumber(ctx, BigInt(arg)) : ofString(ctx, arg);
      term = app(ctx, term, argTree);
    }

    const result = reduce(ctx, term);
    console.log(decode(ctx, result));
  } catch (e) {
    console.error(`Error: ${e.message}`);
    process.exit(1);
  } finally {
    free(ctx);
  }
}

// ── Main ─────────────────────────────────────────────────────────────────────

const args = process.argv.slice(2);
const command = args[0];

switch (command) {
  case 'inspect': {
    if (args.length < 2) {
      console.error('Usage: node cli.js inspect <bundle.arboricx>');
      process.exit(1);
    }
    cmdInspect(args[1]);
    break;
  }
  case 'run': {
    if (args.length < 2) {
      console.error('Usage: node cli.js run <bundle.arboricx> [args...]');
      process.exit(1);
    }
    cmdRun(args[1], args.slice(2));
    break;
  }
  default:
    console.log('Arboricx JS Host (via libarboricx FFI)');
    console.log('');
    console.log('Usage:');
    console.log('  node cli.js inspect <bundle.arboricx>');
    console.log('  node cli.js run <bundle.arboricx> [args...]');
    break;
}