/**
 * Convertir Markdown a HTML
 * Usa remark/rehype para procesar Markdown
 */

import { readFile, writeFile } from 'fs/promises';
import { join } from 'path';
import { remark } from 'remark';
import remarkGfm from 'remark-gfm';
import remarkRehype from 'remark-rehype';
import rehypeStringify from 'rehype-stringify';
import rehypeHighlight from 'rehype-highlight';
import rehypeRaw from 'rehype-raw';
import rehypeSanitize from 'rehype-sanitize';

/**
 * Convertir un archivo Markdown a HTML
 */
export async function convertMarkdownToHtml(
    markdownPath: string,
    outputPath?: string
): Promise<string> {
    try {
        // Leer archivo Markdown
        const markdown = await readFile(markdownPath, 'utf-8');
        
        // Procesar Markdown → HTML
        const result = await remark()
            .use(remarkGfm) // GitHub Flavored Markdown
            .use(remarkRehype, { allowDangerousHtml: true }) // Convertir a HTML
            .use(rehypeRaw) // Permitir HTML crudo
            .use(rehypeSanitize) // Sanitizar HTML
            .use(rehypeHighlight) // Resaltado de código
            .use(rehypeStringify) // Convertir a string
            .process(markdown);
        
        const html = result.toString();
        
        // Guardar si se especifica outputPath
        if (outputPath) {
            await writeFile(outputPath, html, 'utf-8');
        }
        
        return html;
    } catch (error) {
        console.error(`Error convirtiendo ${markdownPath}:`, error);
        throw error;
    }
}

/**
 * Convertir múltiples archivos Markdown
 */
export async function convertMultipleMarkdown(
    markdownPaths: string[],
    outputDir: string
): Promise<string[]> {
    const htmlFiles: string[] = [];
    
    for (const markdownPath of markdownPaths) {
        const fileName = markdownPath.split('/').pop()?.replace('.md', '.html') || 'section.html';
        const outputPath = join(outputDir, fileName);
        
        await convertMarkdownToHtml(markdownPath, outputPath);
        htmlFiles.push(outputPath);
    }
    
    return htmlFiles;
}