const express = require('express');
const authenticate = require('../middleware/auth');
const Drawing = require('../models/Drawing');

const router = express.Router();

// All routes require authentication
router.use(authenticate);

// List drawings for current user
router.get('/', async (req, res) => {
  try {
    const drawings = await Drawing.findAll({
      where: { userId: req.user.id },
      attributes: ['id', 'name', 'updatedAt'],
      order: [['updatedAt', 'DESC']],
    });
    res.json(drawings);
  } catch (err) {
    console.error(err);
    res.status(500).json({ error: 'Failed to list drawings' });
  }
});

// Create new drawing
router.post('/', async (req, res) => {
  try {
    const { name, canvas_json } = req.body;
    const drawing = await Drawing.create({
      name: name || 'Unbenannt',
      canvas_json: canvas_json || '',
      userId: req.user.id,
    });
    res.status(201).json(drawing);
  } catch (err) {
    console.error(err);
    res.status(500).json({ error: 'Failed to create drawing' });
  }
});

// Get single drawing
router.get('/:id', async (req, res) => {
  try {
    const drawing = await Drawing.findOne({
      where: { id: req.params.id, userId: req.user.id },
    });
    if (!drawing) {
      return res.status(404).json({ error: 'Drawing not found' });
    }
    res.json(drawing);
  } catch (err) {
    console.error(err);
    res.status(500).json({ error: 'Failed to get drawing' });
  }
});

// Update drawing
router.put('/:id', async (req, res) => {
  try {
    const drawing = await Drawing.findOne({
      where: { id: req.params.id, userId: req.user.id },
    });
    if (!drawing) {
      return res.status(404).json({ error: 'Drawing not found' });
    }
    const { name, canvas_json } = req.body;
    if (name !== undefined) drawing.name = name;
    if (canvas_json !== undefined) drawing.canvas_json = canvas_json;
    await drawing.save();
    res.json(drawing);
  } catch (err) {
    console.error(err);
    res.status(500).json({ error: 'Failed to update drawing' });
  }
});

// Delete drawing
router.delete('/:id', async (req, res) => {
  try {
    const drawing = await Drawing.findOne({
      where: { id: req.params.id, userId: req.user.id },
    });
    if (!drawing) {
      return res.status(404).json({ error: 'Drawing not found' });
    }
    await drawing.destroy();
    res.json({ message: 'Drawing deleted' });
  } catch (err) {
    console.error(err);
    res.status(500).json({ error: 'Failed to delete drawing' });
  }
});

module.exports = router;