controllers/subcategoryController.js

import Subcategory from '../models/Subcategory.js';

// @desc    Create a new subcategory with an image
// @route   POST /api/subcategories
export const createSubcategory = async (req, res) => {
  try {
    const { name, parentCategory } = req.body;
    
    // Ensure an image was uploaded via Cloudinary/Multer
    if (!req.file) {
      return res.status(400).json({ success: false, message: 'Subcategory image is required' });
    }

    const subcategory = new Subcategory({
      name,
      parentCategory,
      image: req.file.path // Cloudinary secure URL
    });

    const savedSubcategory = await subcategory.save();
    res.status(201).json({ success: true, subcategory: savedSubcategory });

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

// @desc    Get all subcategories (Optionally filter by parentCategory)
// @route   GET /api/subcategories
export const getSubcategories = async (req, res) => {
  try {
    const filter = req.query.parentCategory ? { parentCategory: req.query.parentCategory } : {};
    const subcategories = await Subcategory.find(filter).sort({ createdAt: -1 });
    
    res.status(200).json({ success: true, subcategories });
  } catch (error) {
    res.status(500).json({ success: false, message: 'Server Error' });
  }
};

// @desc    Update a subcategory
// @route   PUT /api/subcategories/:id
export const updateSubcategory = async (req, res) => {
  try {
    const { name, parentCategory } = req.body;
    let updateData = { name, parentCategory };
    
    // If the user uploaded a new image, update the URL
    if (req.file) {
      updateData.image = req.file.path;
    }

    const updatedSubcategory = await Subcategory.findByIdAndUpdate(
      req.params.id,
      updateData,
      { new: true, runValidators: true }
    );

    if (!updatedSubcategory) {
      return res.status(404).json({ success: false, message: 'Subcategory not found' });
    }

    res.status(200).json({ success: true, subcategory: updatedSubcategory, message: 'Updated successfully' });
  } catch (error) {
    res.status(500).json({ success: false, message: 'Server Error updating subcategory' });
  }
};

// @desc    Delete a subcategory
// @route   DELETE /api/subcategories/:id
export const deleteSubcategory = async (req, res) => {
  try {
    const subcategory = await Subcategory.findByIdAndDelete(req.params.id);
    
    if (!subcategory) {
      return res.status(404).json({ success: false, message: 'Subcategory not found' });
    }

    res.status(200).json({ success: true, message: 'Subcategory deleted successfully' });
  } catch (error) {
    res.status(500).json({ success: false, message: 'Server Error deleting subcategory' });
  }
};