tasks.js

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

const router = express.Router();

// Get all tasks for authenticated user with search and filter
router.get('/', auth, async (req, res) => {
  try {
    const { search, status, priority } = req.query;
    const query = { user: req.user._id };

    // Search filter
    if (search) {
      query.$or = [
        { title: { $regex: search, $options: 'i' } },
        { description: { $regex: search, $options: 'i' } }
      ];
    }

    // Status filter
    if (status) {
      query.status = status;
    }

    // Priority filter
    if (priority) {
      query.priority = priority;
    }

    const tasks = await Task.find(query).sort({ createdAt: -1 });
    res.json(tasks);
  } catch (error) {
    res.status(500).json({ message: 'Server error', error: error.message });
  }
});

// Get single task
router.get('/:id', auth, async (req, res) => {
  try {
    const task = await Task.findOne({ _id: req.params.id, user: req.user._id });
    
    if (!task) {
      return res.status(404).json({ message: 'Task not found' });
    }

    res.json(task);
  } catch (error) {
    res.status(500).json({ message: 'Server error', error: error.message });
  }
});

// Create new task
router.post('/', auth, async (req, res) => {
  try {
    const { title, description, priority, dueDate } = req.body;

    const task = new Task({
      title,
      description,
      priority,
      dueDate,
      user: req.user._id
    });

    await task.save();
    res.status(201).json(task);
  } catch (error) {
    res.status(500).json({ message: 'Server error', error: error.message });
  }
});

// Update task
router.put('/:id', auth, async (req, res) => {
  try {
    const { title, description, status, priority, dueDate } = req.body;

    const task = await Task.findOneAndUpdate(
      { _id: req.params.id, user: req.user._id },
      { title, description, status, priority, dueDate },
      { new: true, runValidators: true }
    );

    if (!task) {
      return res.status(404).json({ message: 'Task not found' });
    }

    res.json(task);
  } catch (error) {
    res.status(500).json({ message: 'Server error', error: error.message });
  }
});

// Delete task
router.delete('/:id', auth, async (req, res) => {
  try {
    const task = await Task.findOneAndDelete({ _id: req.params.id, user: req.user._id });

    if (!task) {
      return res.status(404).json({ message: 'Task not found' });
    }

    res.json({ message: 'Task deleted successfully' });
  } catch (error) {
    res.status(500).json({ message: 'Server error', error: error.message });
  }
});

// Toggle task completion status
router.patch('/:id/toggle', auth, async (req, res) => {
  try {
    const task = await Task.findOne({ _id: req.params.id, user: req.user._id });

    if (!task) {
      return res.status(404).json({ message: 'Task not found' });
    }

    task.status = task.status === 'pending' ? 'completed' : 'pending';
    await task.save();

    res.json(task);
  } catch (error) {
    res.status(500).json({ message: 'Server error', error: error.message });
  }
});

module.exports = router;