#!/usr/bin/env node
/**
 * Post-build: inline critical CSS in dist/*.html (SvelteKit adapter-static output).
 * Runs after vite build; Beasties reads/writes relative to dist/.
 *
 * Beasties with preload:'default' adds preload tags; same options as legacy Critters.
 */

import Beasties from 'beasties';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const ROOT = path.join(__dirname, '..');
const DIST = path.join(ROOT, 'dist');

async function main() {
    if (!fs.existsSync(DIST)) {
        console.error('dist/ not found. Run vite build first.');
        process.exit(1);
    }

    const beasties = new Beasties({
        path: DIST,
        preload: 'default',
        noscriptFallback: true,
        pruneSource: false,
        logLevel: 'warn',
    });

    const rootFiles = fs.readdirSync(DIST)
        .filter((f) => f.endsWith('.html'))
        .map((f) => path.join(DIST, f));

    const servicesDir = path.join(DIST, 'services');
    const serviceFiles = [];

    if (fs.existsSync(servicesDir)) {
        const walk = (dir) => {
            for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
                const fullPath = path.join(dir, entry.name);
                if (entry.isDirectory()) {
                    walk(fullPath);
                } else if (entry.isFile() && entry.name.endsWith('.html')) {
                    serviceFiles.push(fullPath);
                }
            }
        };

        walk(servicesDir);
    }

    const files = [...rootFiles, ...serviceFiles];

    for (const filePath of files) {
        let html = fs.readFileSync(filePath, 'utf8');
        html = await beasties.process(html);
        fs.writeFileSync(filePath, html, 'utf8');
        console.log('✓ Critical CSS inlined → dist/' + path.relative(DIST, filePath));
    }

    console.log('Critical CSS step complete.');
}

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