catalog/controller/extension/module/category.php

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<?php
class ControllerExtensionModuleCategory extends Controller {
  public function index() {
    $this->load->language('extension/module/category');

    if (isset($this->request->get['path'])) {
      $parts = explode('_', (string)$this->request->get['path']);
    } else {
      $parts = array();
    }

    if (isset($parts[0])) {
      $data['category_id'] = $parts[0];
    } else {
      $data['category_id'] = 0;
    }

    if (isset($parts[1])) {
      $data['child_id'] = $parts[1];
    } else {
      $data['child_id'] = 0;
    }

    $this->load->model('catalog/category');

    $this->load->model('catalog/product');

    $data['categories'] = array();

    $categories = $this->model_catalog_category->getCategories(0);

    foreach ($categories as $category) {
      $children_data = array();

      $children = $this->model_catalog_category->getCategories($category['category_id']);

      foreach($children as $child) {
        $filter_data = array('filter_category_id' => $child['category_id'], 'filter_sub_category' => true);

        $children_data[] = array(
          'category_id' => $child['category_id'],
          'name' => $child['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_data) . ')' : ''),
          'href' => $this->url->link('product/category', 'path=' . $category['category_id'] . '_' . $child['category_id'])
        );
      }

      $filter_data = array(
        'filter_category_id'  => $category['category_id'],
        'filter_sub_category' => true
      );

      $data['categories'][] = array(
        'category_id' => $category['category_id'],
        'name'        => $category['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_data) . ')' : ''),
        'children'    => $children_data,
        'href'        => $this->url->link('product/category', 'path=' . $category['category_id'])
      );
    }

    return $this->load->view('extension/module/category', $data);