/*
* Lokasi: /features/upscale.js
* Versi: v1
*/

const axios = require('axios');
const FormData = require('form-data');
const crypto = require('crypto');

async function sendCallback(url, payload) {
  try {
    await axios.post(url, payload, { headers: { 'Content-Type': 'application/json' } });
  } catch (error) {
    console.error('Callback failed:', error.message);
  }
}

module.exports = async function(req, res) {
  const { imageUrl, scale, jobId, callbackUrl, callbackKey } = req.body;

  if (!imageUrl || !jobId || !callbackUrl || !callbackKey) {
    return res.status(400).json({ error: 'Missing required parameters.' });
  }

  res.status(202).json({ message: 'Job accepted and is being processed.' });

  try {
    const username = `${crypto.randomBytes(8).toString('hex')}_aiimglarger`;
    const imageResponse = await axios.get(imageUrl, { responseType: 'arraybuffer' });
    const imageBuffer = imageResponse.data;
    const imageName = imageUrl.split('/').pop().split('?')[0] || 'temp.jpg';

    const formData = new FormData();
    formData.append('type', 0);
    formData.append('username', username);
    formData.append('scaleRadio', (scale || 4).toString());
    formData.append('file', imageBuffer, { filename: imageName, contentType: 'image/jpeg' });

    const uploadResponse = await axios.post('https://photoai.imglarger.com/api/PhoAi/Upload', formData, {
      headers: { ...formData.getHeaders(), 'User-Agent': 'Dart/3.5 (dart:io)', 'Accept-Encoding': 'gzip' },
    });

    const { code } = uploadResponse.data.data;
    const pollParams = { code, type: 0, username, scaleRadio: (scale || 4).toString() };

    let statusData = null;
    for (let i = 0; i < 100; i++) {
      const statusResponse = await axios.post('https://photoai.imglarger.com/api/PhoAi/CheckStatus', JSON.stringify(pollParams), {
        headers: { 'User-Agent': 'Dart/3.5 (dart:io)', 'Accept-Encoding': 'gzip', 'Content-Type': 'application/json' },
      });
      statusData = statusResponse.data.data;

      if (statusData.status === 'success') break;
      if (statusData.status === 'failed') throw new Error('Upscaling process failed on the external server.');
      await new Promise(r => setTimeout(r, 2000));
    }

    if (statusData?.status === 'success' && statusData?.downloadUrls?.[0]) {
      await sendCallback(callbackUrl, {
        jobId,
        callbackKey,
        status: 'success',
        result: { url: statusData.downloadUrls[0] },
      });
    } else {
      throw new Error('Failed to get the upscaled image after multiple checks.');
    }
  } catch (e) {
    await sendCallback(callbackUrl, {
      jobId,
      callbackKey,
      status: 'failed',
      result: { error: e.message || 'An unknown error occurred during upscaling.' },
    });
  }
};