#!/usr/bin/env node

'use strict';

const crypto = require('node:crypto');
const fs = require('node:fs');
const path = require('node:path');

const projectRoot = path.resolve(__dirname, '..');
const source = path.join(projectRoot, 'skills', 'crypstie', 'SKILL.md');
const outputRoot = path.resolve(process.argv[2] || path.join(projectRoot, 'build', 'agent-skills'));
const skillDirectory = path.join(outputRoot, 'crypstie');
const skillTarget = path.join(skillDirectory, 'SKILL.md');
const indexTarget = path.join(outputRoot, 'index.json');
const llmsTarget = path.join(outputRoot, 'llms.txt');

const skill = fs.readFileSync(source);
const text = skill.toString('utf8');
const description = text.match(/^description:\s*(.+)$/m)?.[1]?.trim();

if (!description) {
  throw new Error('skills/crypstie/SKILL.md has no description in its frontmatter');
}

fs.mkdirSync(skillDirectory, { recursive: true });
fs.writeFileSync(skillTarget, skill);

const digest = crypto.createHash('sha256').update(skill).digest('hex');
const index = {
  $schema: 'https://schemas.agentskills.io/discovery/0.2.0/schema.json',
  skills: [
    {
      name: 'crypstie',
      type: 'skill-md',
      description,
      url: '/.well-known/agent-skills/crypstie/SKILL.md',
      digest: `sha256:${digest}`,
    },
  ],
};

fs.writeFileSync(indexTarget, `${JSON.stringify(index, null, 2)}\n`);
fs.writeFileSync(
  llmsTarget,
  [
    '# Crypstie',
    '',
    '> End-to-end encrypted links for text and files.',
    '',
    '## Agent skill',
    '',
    '- [Crypstie skill](https://crypstie.com/.well-known/agent-skills/crypstie/SKILL.md): Create and open Crypstie links with the npm CLI.',
    '- [Skill discovery index](https://crypstie.com/.well-known/agent-skills/index.json): Machine-readable Agent Skills index with integrity metadata.',
    '',
    '## Package',
    '',
    '- [crypstie on npm](https://www.npmjs.com/package/crypstie): Node.js library and command-line client.',
    '',
  ].join('\n'),
);

console.log(outputRoot);