const express = require('express');
const { marpCli } = require('@marp-team/marp-cli');
const fs = require('fs').promises;
const path = require('path');

const app = express();
app.use(express.json());

const tmpDir = '/tmp/marp-work';

app.post('/convert', async (req, res) => {
    const { markdown, outputFormat, options = [] } = req.body;

    if (!markdown || !outputFormat) {
        return res.status(400).json({ error: 'Missing markdown or outputFormat' });
    }

    try {
        const inputFile = path.join(tmpDir, `input_${Date.now()}.md`);
        const outputFile = path.join(tmpDir, `output_${Date.now()}.${outputFormat}`);

        await fs.writeFile(inputFile, markdown);

        const cliOptions = [
            inputFile,
            '--output',
            outputFile,
            `--${outputFormat}`,
            '--html',
            ...options
        ];

        if (outputFormat === 'pdf') {
            cliOptions.push(
                '--allow-local-files',
                '--pdf-notes',
                '--pdf-delay', '3000'
            );
        } else if (outputFormat === 'pptx') {
            cliOptions.push(
                 '--pptx-editable',
                '--allow-local-files',
                '--pptx-notes',
                '--pptx-delay', '3000'
            );
        }

        await marpCli(cliOptions);
        const output = await fs.readFile(outputFile);

        await fs.unlink(inputFile);
        await fs.unlink(outputFile);

        res.contentType(outputFormat);
        res.send(output);
    } catch (error) {
        console.error('Conversion error:', error);
        res.status(500).json({ error: 'Conversion failed', details: error.message });
    }
});

const port = process.env.PORT || 7860;
app.listen(port, () => {
    console.log(`Marp API server listening on port ${port}`);
});