#!/usr/bin/env npx tsx
/**
 * scripts/skill-sync.ts — Refresh all remote-sourced skills in the cache.
 *
 * Usage:
 *   just skill-sync
 *
 * Iterates all non-local: sources in library.yaml, fetches the latest
 * content, and updates .agent/library-cache/.
 */
import fs from 'fs';
import path from 'path';
import https from 'https';

import { parse } from 'yaml';

import { PROJECT_ROOT } from '../src/config.js';

const LIBRARY_PATH = path.join(PROJECT_ROOT, 'agent', 'library.yaml');
const CACHE_DIR = path.join(PROJECT_ROOT, '.agent', 'library-cache');

interface Entry {
  id: string;
  source: string;
}

function sourceToUrl(src: string): string | null {
  if (src.startsWith('local:')) return null;
  if (src.startsWith('raw:')) return src.slice('raw:'.length);
  if (src.startsWith('codeberg:')) {
    const rest = src.slice('codeberg:'.length);
    const [owner, repo, ...fileParts] = rest.split('/');
    return `https://codeberg.org/${owner}/${repo}/raw/branch/main/${fileParts.join('/')}`;
  }
  if (src.startsWith('github:')) {
    const rest = src.slice('github:'.length);
    const [owner, repo, ...fileParts] = rest.split('/');
    return `https://raw.githubusercontent.com/${owner}/${repo}/main/${fileParts.join('/')}`;
  }
  return null;
}

function fetchUrl(url: string): Promise<string> {
  return new Promise((resolve, reject) => {
    https.get(url, (res) => {
      if (res.statusCode === 301 || res.statusCode === 302) {
        fetchUrl(res.headers.location!).then(resolve).catch(reject);
        return;
      }
      if (res.statusCode !== 200) {
        reject(new Error(`HTTP ${res.statusCode} fetching ${url}`));
        return;
      }
      const chunks: Buffer[] = [];
      res.on('data', (c: Buffer) => chunks.push(c));
      res.on('end', () => resolve(Buffer.concat(chunks).toString('utf-8')));
      res.on('error', reject);
    }).on('error', reject);
  });
}

async function main(): Promise<void> {
  if (!fs.existsSync(LIBRARY_PATH)) {
    console.error(`Library not found: ${LIBRARY_PATH}`);
    process.exit(1);
  }

  const lib = parse(fs.readFileSync(LIBRARY_PATH, 'utf-8')) as {
    skills?: Entry[];
    features?: Entry[];
    agents?: Entry[];
    prompts?: Entry[];
  };

  const allEntries: Entry[] = [
    ...(lib.skills ?? []),
    ...(lib.features ?? []),
    ...(lib.agents ?? []),
    ...(lib.prompts ?? []),
  ];

  const remote = allEntries.filter((e) => !e.source.startsWith('local:'));

  if (remote.length === 0) {
    console.log('No remote sources in library — nothing to sync.');
    return;
  }

  if (!fs.existsSync(CACHE_DIR)) fs.mkdirSync(CACHE_DIR, { recursive: true });

  let updated = 0;
  let failed = 0;

  for (const entry of remote) {
    const url = sourceToUrl(entry.source);
    if (!url) {
      console.warn(`  [skip] ${entry.id}: unknown source prefix`);
      continue;
    }

    try {
      process.stdout.write(`  Fetching ${entry.id}... `);
      const content = await fetchUrl(url);
      const safe = entry.source.replace(/[^a-zA-Z0-9._-]/g, '_');
      fs.writeFileSync(path.join(CACHE_DIR, safe), content, 'utf-8');
      console.log('ok');
      updated++;
    } catch (err) {
      console.log(`FAILED (${(err as Error).message})`);
      failed++;
    }
  }

  console.log(`\nSync complete: ${updated} updated, ${failed} failed.`);
  if (failed > 0) process.exit(1);
}

main().catch((err: Error) => {
  console.error(err.message);
  process.exit(1);
});