#!/usr/bin/env node

/**
 * Generate output HTML from template + data for crystal-battery documents.
 *
 * Usage: node generate.mjs <docId>
 * Example: node generate.mjs crystal-battery-1
 *
 * Reads:  docs/<docId>.template.html
 * Reads:  docs/<docId>.data.json (optional)
 * Writes: docs/<docId>.output.html
 */

import { readFileSync, writeFileSync, existsSync } from 'fs';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';
import { postGenerate } from '../../../src/scripts/post-generate.mjs';

const __dirname = dirname(fileURLToPath(import.meta.url));
const docsDir = join(__dirname, '..', 'docs');

const docId = process.argv[2];
if (!docId) {
  console.error('Usage: node generate.mjs <docId>');
  process.exit(1);
}

const templatePath = join(docsDir, `${docId}.template.html`);
const dataPath = join(docsDir, `${docId}.data.json`);
const outputPath = join(docsDir, `${docId}.output.html`);

if (!existsSync(templatePath)) {
  console.error(`Template not found: ${templatePath}`);
  process.exit(1);
}

let html = readFileSync(templatePath, 'utf-8');

if (existsSync(dataPath)) {
  const data = JSON.parse(readFileSync(dataPath, 'utf-8'));
  // No transforms defined yet — data.json support reserved for future editor
  console.log(`Data file found (${data.pages?.length || 0} pages), no transforms applied yet`);
}

writeFileSync(outputPath, html);
console.log(`Generated: ${outputPath}`);
await postGenerate(outputPath);