frontend/controllers/FilterController.php

<?php
    
    namespace frontend\controllers;
    
    use common\modules\product\models\Brand;
    use common\modules\product\models\Category;
    use common\modules\product\models\ProductSearch;
    use common\modules\rubrication\models\TaxOption;
    use yii\web\Controller;
    use yii\web\NotFoundHttpException;
    
    /**
     * Filter controller
     */
    class FilterController extends Controller
    {
        
        public function actionIndex($category_id, $purpose_id)
        {
            $category = $this->findCategory($category_id);
            $purpose = $this->findPurpose($purpose_id);
            $brands = Brand::find()
                           ->joinWith('lang', true, 'INNER JOIN')
                           ->joinWith('products.lang')
                           ->joinWith('products.categories.lang')
                           ->joinWith('products.options.lang')
                           ->where([
                               'category.category_id'     => $category->category_id,
                               'tax_option.tax_option_id' => $purpose->tax_option_id,
                           ])
                           ->all();
            return $this->render('index', [
                'category' => $category,
                'purpose'  => $purpose,
                'brands'   => $brands,
            ]);
        }
        
        /**
         * Filter by type.
         * @return string
         */
        public function actionCategory($id)
        {
            $category = $this->findCategory($id);
            $purposes = TaxOption::find()
                                 ->joinWith('lang', true, 'INNER JOIN')
                                 ->joinWith('products.lang')
                                 ->joinWith('products.categories.lang')
                                 ->joinWith('products.brand.lang')
                                 ->joinWith('taxGroup')
                                 ->where([
                                     'category.category_id'   => $category->category_id,
                                     'tax_group.tax_group_id' => 5,
                                 ])
                                 ->all();
            $brands = [];
            foreach($purposes as $purpose) {
                /**
                 * @var TaxOption $purpose
                 */
                $brands[ $purpose->tax_option_id ] = [];
                foreach($purpose->products as $product) {
                    /**
                     * @var Brand $brand
                     */
                    $brand = $product->brand;
                    if(!empty( $brand )) {
                        $brands[ $purpose->tax_option_id ][ $brand->brand_id ] = $brand;
                    }
                }
            }
            return $this->render('category', [
                'category' => $category,
                'purposes' => $purposes,
                'brands'   => $brands,
            ]);
        }
        
        /**
         * Filter by purpose.
         * @return string
         */
        public function actionPurpose($id)
        {
            $purpose = $this->findPurpose($id);
            $categories = Category::find()
                                  ->joinWith('products.lang')
                                  ->joinWith('products.brand.lang')
                                  ->joinWith('products.options.lang')
                                  ->where([ 'tax_option.tax_option_id' => $purpose->tax_option_id ])
                                  ->all();
            $brands = [];
            foreach($categories as $category) {
                $brands[ $category->category_id ] = [];
                foreach($category->products as $product) {
                    /**
                     * @var Brand $brand
                     */
                    $brand = $product->brand;
                    if(!empty( $brand )) {
                        $brands[ $category->category_id ][ $brand->brand_id ] = $brand;
                    }
                }
            }
            return $this->render('purpose', [
                'purpose'    => $purpose,
                'categories' => $categories,
                'brands'     => $brands,
            ]);
        }
        
        public function actionBrand($category_id, $purpose_id, $brand_id)
        {
            $category = $this->findCategory($category_id);
            $purpose = $this->findPurpose($purpose_id);
            $brand = $this->findBrand($brand_id);
            $searchModel = new ProductSearch();
            $dataProvider = $searchModel->search(\Yii::$app->request->queryParams);
            $dataProvider->pagination = false;
            $query = $dataProvider->query;
            $query->with('variants.lang')
                  ->joinWith('brand.lang')
                  ->joinWith('options.lang')
                  ->joinWith('categories.lang')
                  ->andWhere([
                      'category.category_id'     => $category->category_id,
                      'tax_option.tax_option_id' => $purpose->tax_option_id,
                      'brand.brand_id'           => $brand->brand_id,
                  ]);
            return $this->render('brand', [
                'category'     => $category,
                'purpose'      => $purpose,
                'brand'        => $brand,
                'searchModel'  => $searchModel,
                'dataProvider' => $dataProvider,
            ]);
        }
        
        /**
         * @param $id
         *
         * @return TaxOption
         * @throws NotFoundHttpException
         */
        private function findPurpose($id)
        {
            $model = TaxOption::find()
                              ->joinWith('taxGroup')
                              ->where([
                                  'tax_option.tax_option_id' => $id,
                                  'tax_group.tax_group_id'   => 5,
                              ])
                              ->one();
            if(empty( $model )) {
                throw new NotFoundHttpException();
            }
            return $model;
        }
        
        /**
         * @param $id
         *
         * @return Category
         * @throws NotFoundHttpException
         */
        private function findCategory($id)
        {
            $model = Category::find()
                             ->where([
                                 'category.category_id' => $id,
                             ])
                             ->one();
            if(empty( $model )) {
                throw new NotFoundHttpException();
            }
            return $model;
        }
        
        /**
         * @param $id
         *
         * @return Brand
         * @throws NotFoundHttpException
         */
        private function findBrand($id)
        {
            /**
             * @var Brand $model
             */
            $model = Brand::find()
                          ->where([
                              'brand.brand_id' => $id,
                          ])
                          ->one();
            if(empty( $model )) {
                throw new NotFoundHttpException();
            }
            return $model;
        }
    }