const express = require('express');
const { ShoppingItem } = require('../models');
const { Op } = require('sequelize');

const router = express.Router();

// Get all shopping items
router.get('/', async (req, res) => {
  try {
    const items = await ShoppingItem.findAll({
      order: [['createdAt', 'DESC']],
    });
    res.json(items);
  } catch (error) {
    console.error('Error fetching shopping items:', error);
    res.status(500).json({ error: 'Failed to fetch shopping items' });
  }
});

// Get a specific shopping item
router.get('/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const item = await ShoppingItem.findByPk(id);
    
    if (!item) {
      return res.status(404).json({ error: 'Shopping item not found' });
    }
    
    res.json(item);
  } catch (error) {
    console.error('Error fetching shopping item:', error);
    res.status(500).json({ error: 'Failed to fetch shopping item' });
  }
});

// Create a new shopping item
router.post('/', async (req, res) => {
  try {
    const { name, amount, date } = req.body;
    
    if (!name) {
      return res.status(400).json({ error: 'Name is required' });
    }
    
    const item = await ShoppingItem.create({
      name,
      amount: amount || '1',
      date: date || new Date(),
    });
    
    res.status(201).json(item);
  } catch (error) {
    console.error('Error creating shopping item:', error);
    res.status(500).json({ error: 'Failed to create shopping item' });
  }
});

// Update a shopping item
router.put('/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const { name, amount, checked, date } = req.body;
    
    const item = await ShoppingItem.findByPk(id);
    
    if (!item) {
      return res.status(404).json({ error: 'Shopping item not found' });
    }
    
    // Update fields if provided
    if (name !== undefined) item.name = name;
    if (amount !== undefined) item.amount = amount;
    if (checked !== undefined) item.checked = checked;
    if (date !== undefined) item.date = date;
    
    await item.save();
    
    res.json(item);
  } catch (error) {
    console.error('Error updating shopping item:', error);
    res.status(500).json({ error: 'Failed to update shopping item' });
  }
});

// Toggle checked status of a shopping item
router.patch('/:id/toggle', async (req, res) => {
  try {
    const { id } = req.params;
    
    const item = await ShoppingItem.findByPk(id);
    
    if (!item) {
      return res.status(404).json({ error: 'Shopping item not found' });
    }
    
    item.checked = !item.checked;
    await item.save();
    
    res.json(item);
  } catch (error) {
    console.error('Error toggling shopping item:', error);
    res.status(500).json({ error: 'Failed to toggle shopping item' });
  }
});

// Delete a shopping item
router.delete('/:id', async (req, res) => {
  try {
    const { id } = req.params;
    
    const item = await ShoppingItem.findByPk(id);
    
    if (!item) {
      return res.status(404).json({ error: 'Shopping item not found' });
    }
    
    await item.destroy();
    
    res.json({ message: 'Shopping item deleted successfully' });
  } catch (error) {
    console.error('Error deleting shopping item:', error);
    res.status(500).json({ error: 'Failed to delete shopping item' });
  }
});

// Delete all checked items
router.delete('/checked/all', async (req, res) => {
  try {
    const deletedCount = await ShoppingItem.destroy({
      where: {
        checked: true,
      },
    });
    
    res.json({ 
      message: `Deleted ${deletedCount} checked items`,
      deletedCount 
    });
  } catch (error) {
    console.error('Error deleting checked items:', error);
    res.status(500).json({ error: 'Failed to delete checked items' });
  }
});

module.exports = router;