#!/usr/bin/env node
/**
 * Build script for the native host.
 * Generates the bridge-swarm-host launcher script.
 */

const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const nativeHostDir = path.join(__dirname, '..', 'native-host');
const launcherPath = path.join(nativeHostDir, 'bridge-swarm-host');
const nodeBin = process.execPath;

function isExecutable(p) {
  try {
    fs.accessSync(p, fs.constants.X_OK);
    return true;
  } catch {
    return false;
  }
}

// Prefer the Bare package installed with native-host (pinned runtime).
let bareBin = path.join(nativeHostDir, 'node_modules', 'bare', 'bin', 'bare');
if (!isExecutable(bareBin)) {
  bareBin = null;
  try {
    bareBin = execSync('which bare', { encoding: 'utf8' }).trim();
  } catch {}
}

if (!bareBin) {
  for (const p of ['/opt/homebrew/bin/bare', '/usr/local/bin/bare']) {
    if (isExecutable(p)) {
      bareBin = p;
      break;
    }
  }
}

if (!bareBin) {
  bareBin = nodeBin.replace(/node$/, 'bare');
}

// bare's npm bin is a Node script that spawns bare-runtime
const launcherContent = `#!/usr/bin/env bash
DIR="$(cd "$(dirname "$0")" && pwd)"
exec "${nodeBin}" "${bareBin}" "$DIR/index.mjs" "$@"
`;

fs.writeFileSync(launcherPath, launcherContent);
fs.chmodSync(launcherPath, '755');

console.log('Native host launcher generated at:', launcherPath);
console.log('Using node:', nodeBin);
console.log('Using bare:', bareBin);