/* eslint-disable no-console -- logs required */

import fs from 'fs';
import path from 'path';

const docsDir = path.resolve(import.meta.dirname, '..', process.argv[2] || 'docs');

pinIndexToTop();

/**
 * Гарантирует наличие sidebar_position: 0 в front matter файла index.md
 */
function pinIndexToTop() {
    const indexPath = path.join(docsDir, 'index.md');

    if (!fs.existsSync(indexPath)) {
        return;
    }

    let content = fs.readFileSync(indexPath, 'utf8');

    if (content.startsWith('---\n')) {
        const endIdx = content.indexOf('\n---\n', 4);

        if (endIdx === -1) {
            return;
        }

        const frontMatter = content.slice(4, endIdx);

        if (/^sidebar_position\s*:/m.test(frontMatter)) {
            return;
        }

        content =
            '---\nsidebar_position: 0\n' + frontMatter + '\n---\n' + content.slice(endIdx + 5);
    } else {
        content = '---\nsidebar_position: 0\n---\n' + content;
    }

    fs.writeFileSync(indexPath, content);
    console.log('prepare-docs: pinned index.md to sidebar top');
}