const express = require('express');
const { Op } = require('sequelize');
const { Item, User, Rental } = require('../models'); // Import from models/index.js to get models with associations
const { authenticateToken } = require('../middleware/auth');
const router = express.Router();

router.get('/', async (req, res) => {
  try {
    const {
      isPortable,
      minPrice,
      maxPrice,
      location,
      search,
      page = 1,
      limit = 20
    } = req.query;

    const where = {};
    
    if (isPortable !== undefined) where.isPortable = isPortable === 'true';
    if (minPrice || maxPrice) {
      where.pricePerDay = {};
      if (minPrice) where.pricePerDay[Op.gte] = minPrice;
      if (maxPrice) where.pricePerDay[Op.lte] = maxPrice;
    }
    if (location) where.location = { [Op.iLike]: `%${location}%` };
    if (search) {
      where[Op.or] = [
        { name: { [Op.iLike]: `%${search}%` } },
        { description: { [Op.iLike]: `%${search}%` } }
      ];
    }

    const offset = (page - 1) * limit;

    const { count, rows } = await Item.findAndCountAll({
      where,
      include: [{ model: User, as: 'owner', attributes: ['id', 'username', 'firstName', 'lastName'] }],
      limit: parseInt(limit),
      offset: parseInt(offset),
      order: [['createdAt', 'DESC']]
    });

    res.json({
      items: rows,
      totalPages: Math.ceil(count / limit),
      currentPage: parseInt(page),
      totalItems: count
    });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

router.get('/recommendations', authenticateToken, async (req, res) => {
  try {
    const userRentals = await Rental.findAll({
      where: { renterId: req.user.id },
      include: [{ model: Item, as: 'item' }]
    });

    // For now, just return random available items as recommendations
    const recommendations = await Item.findAll({
      where: {
        availability: true
      },
      limit: 10,
      order: [['createdAt', 'DESC']]
    });

    res.json(recommendations);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

router.get('/:id', async (req, res) => {
  try {
    const item = await Item.findByPk(req.params.id, {
      include: [{ model: User, as: 'owner', attributes: ['id', 'username', 'firstName', 'lastName'] }]
    });

    if (!item) {
      return res.status(404).json({ error: 'Item not found' });
    }

    res.json(item);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

router.post('/', authenticateToken, async (req, res) => {
  try {
    const item = await Item.create({
      ...req.body,
      ownerId: req.user.id
    });

    const itemWithOwner = await Item.findByPk(item.id, {
      include: [{ model: User, as: 'owner', attributes: ['id', 'username', 'firstName', 'lastName'] }]
    });

    res.status(201).json(itemWithOwner);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

router.put('/:id', authenticateToken, async (req, res) => {
  try {
    const item = await Item.findByPk(req.params.id);

    if (!item) {
      return res.status(404).json({ error: 'Item not found' });
    }

    if (item.ownerId !== req.user.id) {
      return res.status(403).json({ error: 'Unauthorized' });
    }

    await item.update(req.body);

    const updatedItem = await Item.findByPk(item.id, {
      include: [{ model: User, as: 'owner', attributes: ['id', 'username', 'firstName', 'lastName'] }]
    });

    res.json(updatedItem);
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

router.delete('/:id', authenticateToken, async (req, res) => {
  try {
    const item = await Item.findByPk(req.params.id);

    if (!item) {
      return res.status(404).json({ error: 'Item not found' });
    }

    if (item.ownerId !== req.user.id) {
      return res.status(403).json({ error: 'Unauthorized' });
    }

    await item.destroy();
    res.status(204).send();
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

module.exports = router;