app/api/shadow.js

// const express = require('express');
// const multer = require('multer');
// const { generateShadow } = require('../core/shadowGenerator');

// const router = express.Router();

// // Store file in memory (not on disk)
// const storage = multer.memoryStorage();
// const upload = multer({ storage });

// // POST /api/shadow/generate
// router.post('/generate', upload.single('image'), async (req, res) => {
//   try {
//     if (!req.file) {
//       return res.status(400).json({ success: false, error: 'No image uploaded' });
//     }

//     const options = {
//       type: req.body.type || 'cast',         // 'cast' | 'drop' | 'flat' | 'box'
//       dir: req.body.dir || 'back',           // used only for drop/flat/box
//       blur: parseInt(req.body.blur) || 20,
//       opacity: parseFloat(req.body.opacity) || 0.4,
//       lightX: req.body.lightX ? parseInt(req.body.lightX) : null,
//       lightY: req.body.lightY ? parseInt(req.body.lightY) : null
//     };

//     const buffer = await generateShadow(req.file.buffer, options);

//     // Send back as image/png directly
//     res.set('Content-Type', 'image/png');
//     res.send(buffer);

//   } catch (err) {
//     console.error('❌ Shadow generation error:', err);
//     res.status(500).json({ success: false, error: 'Shadow generation failed' });
//   }
// });

// module.exports = router;


// const express = require('express');
// const multer = require('multer');
// const { generateShadow } = require('../core/shadowGenerator');

// const router = express.Router();

// // Use memory storage for uploaded file
// const storage = multer.memoryStorage();
// const upload = multer({ storage });

// router.post('/generate', upload.single('image'), async (req, res) => {
//   try {
//     if (!req.file) {
//       return res.status(400).json({ success: false, error: 'No image uploaded' });
//     }

//     // Parse options correctly
//     const options = {
//       type: req.body.mode || 'cast',           // match frontend "mode"
//       dir: req.body.dir || 'back',
//       blur: req.body.blur ? parseFloat(req.body.blur) : 20,   // ensure number
//       opacity: req.body.opacity ? parseFloat(req.body.opacity) : 0.35,
//       lightX: req.body.lightX ? parseFloat(req.body.lightX) : null,
//       lightY: req.body.lightY ? parseFloat(req.body.lightY) : null
//     };

//     const buffer = await generateShadow(req.file.buffer, options);

//     res.set('Content-Type', 'image/png');
//     res.send(buffer);

//   } catch (err) {
//     console.error('❌ Shadow generation error:', err);
//     res.status(500).json({ success: false, error: 'Shadow generation failed' });
//   }
// });

// module.exports = router;



const express = require('express');
const multer = require('multer');
const {
  addTask,
  getTaskStatus,
  getTaskResult,
  getQueueLength
} = require('../../queue');

const router = express.Router();
const upload = multer({ storage: multer.memoryStorage() });

// ---------------- Submit new shadow task ----------------
router.post('/add-shadow', upload.single('file'), async (req, res) => {
  try {
    if (!req.file) {
      return res.status(400).json({ error: 'No image uploaded' });
    }

    const options = {
      type: req.body.type || 'cast',
      dir: req.body.dir || 'back',
      blur: req.body.blur ? parseFloat(req.body.blur) : 20,
      opacity: req.body.opacity ? parseFloat(req.body.opacity) : 0.35,
      lightX: req.body.lightX ? parseFloat(req.body.lightX) : null,
      lightY: req.body.lightY ? parseFloat(req.body.lightY) : null,
    };

    const taskId = await addTask(req.file.buffer, options);
    res.json({ task_id: taskId });
  } catch (err) {
    console.error('❌ Error adding shadow task:', err);
    res.status(500).json({ error: 'Failed to add shadow task' });
  }
});

// ---------------- Queue status ----------------
router.get('/status', (req, res) => {
  res.json({
    status: 'ok',
    queue_length: getQueueLength(),
  });
});

// ---------------- Fetch result ----------------
router.get('/result/:id', (req, res) => {
  const taskId = req.params.id;
  const status = getTaskStatus(taskId);

  if (status === 'pending') return res.sendStatus(202);
  if (status === 'failed') return res.status(500).json({ error: 'Shadow generation failed' });

  const result = getTaskResult(taskId);
  if (!result) return res.status(404).json({ error: 'Result not found' });

  res.set('Content-Type', 'image/png');
  res.send(result);
});

module.exports = router;