#!/usr/bin/env node

// Generates plugin/bun.lock as a build artifact from the GENERATED
// plugin/package.json (written by scripts/build-hooks.js). Shipping this
// lockfile lets the runtime installer (src/npx-cli/install/setup-runtime.ts)
// run `bun install --frozen-lockfile --ignore-scripts` for a deterministic
// dependency closure. See plan-10 (Build Artifact Hygiene, Approach A).
//
// MUST run AFTER build-hooks.js. Uses --ignore-scripts so generating the
// lockfile never triggers tree-sitter postinstall builds.

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

const rootDir = path.join(__dirname, '..');
const pluginDir = path.join(rootDir, 'plugin');
const pluginManifest = path.join(pluginDir, 'package.json');

console.log('\n🔒 Generating plugin/bun.lock...');

if (!existsSync(pluginManifest)) {
  throw new Error(
    `gen-plugin-lockfile: no package.json at ${pluginManifest}. ` +
    `Run scripts/build-hooks.js first (it generates plugin/package.json).`
  );
}

const lockfile = path.join(pluginDir, 'bun.lock');

// bun is the only tool that can regenerate the lockfile. On hosts that build
// without bun on PATH (e.g. the Windows build CI job), regeneration is skipped:
// the committed lockfile is already the deterministic closure, so a missing bun
// is non-fatal AS LONG AS the lockfile is present. With neither, we cannot
// produce the closure and must fail loud.
function bunAvailable() {
  try {
    execSync('bun --version', { stdio: 'ignore' });
    return true;
  } catch {
    return false;
  }
}

if (!bunAvailable()) {
  if (existsSync(lockfile)) {
    console.log('⚠️  bun not found on PATH — skipping regeneration; using committed plugin/bun.lock.');
    process.exit(0);
  }
  throw new Error(
    `gen-plugin-lockfile: bun is not on PATH and no committed lockfile exists at ${lockfile}. ` +
    `Install bun (https://bun.sh) so the deterministic dependency closure can be generated.`
  );
}

try {
  execSync('bun install --ignore-scripts', {
    cwd: pluginDir,
    stdio: 'inherit',
  });
} catch (error) {
  throw new Error(`bun install failed in ${pluginDir}\n${error.message}`);
}

if (!existsSync(lockfile)) {
  throw new Error(
    `gen-plugin-lockfile: bun install completed but ${lockfile} was not produced.`
  );
}

console.log('✓ plugin/bun.lock generated');