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<?php

/* --------------------------------------------------------------
   ProductRepositoryDeleter.inc.php 2015-12-08
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2015 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

/**
 * Class ProductRepositoryDeleter
 *
 * @category   System
 * @package    Product
 * @subpackage Repositories
 */
class ProductRepositoryDeleter implements ProductRepositoryDeleterInterface
{
    /**
     * Database connection.
     *
     * @var CI_DB_query_builder
     */
    protected $db;
    
    /**
     * @var \ProductRepositoryDeleteHelper
     */
    protected $deleteHelper;
    
    
    /**
     * ProductRepositoryDeleter constructor.
     *
     * @param CI_DB_query_builder            $db
     * @param \ProductRepositoryDeleteHelper $deleteHelper
     */
    public function __construct(CI_DB_query_builder $db, ProductRepositoryDeleteHelper $deleteHelper)
    {
        $this->db           = $db;
        $this->deleteHelper = $deleteHelper;
    }
    
    
    /**
     * Removes a product by the given product id.
     *
     * @param IdType $productId Id of product entity.
     *
     * @return ProductRepositoryDeleter Same instance for chained method calls.
     */
    public function deleteById(IdType $productId)
    {
        $this->_removeFeatureSetsByProductId($productId)
             ->_removeAdditionalFieldRelationsByProductId($productId)
             ->_removePropertiesByProductId($productId)
             ->_removePersonalOffersByCustomerStatusByProductId($productId)
             ->_removeReviewsByProductId($productId)
             ->_removeRecordsByProductId($productId);

        $this->deleteHelper->productsContent($productId, $this->db, MainFactory::create('ProductsContentFileStorage'),
                                             MainFactory::create('ResponsiveFileManagerConfigurationStorage'))
                           ->resetCategoriesAndAlsoPurchasedCache();
        
        return $this;
    }
    
    
    /**
     * Removes related feature set records by the given product id.
     *
     * @param \IdType $productId Product id of records to be removed.
     *
     * @return $this|ProductRepositoryDeleter Same instance for chained method calls.
     */
    protected function _removeFeatureSetsByProductId(IdType $productId)
    {
        // removal of feature set records
        $featureSets = $this->db->select('feature_set_id')
                                ->from('feature_set_to_products')
                                ->where('products_id', $productId->asInt())
                                ->get()
                                ->result_array();
        $this->db->delete('feature_set_to_products', ['products_id' => $productId->asInt()]);
        foreach($featureSets as $featureSet)
        {
            // check if feature set is used by another product
            $total = (int)$this->db->select('COUNT(*) as total')
                                   ->from('feature_set_to_products')
                                   ->where('feature_set_id', $featureSet['feature_set_id'])
                                   ->get()
                                   ->row_array()['total'];
            
            if($total === 0)
            {
                $this->db->delete([
                                      'feature_index',
                                      'feature_set',
                                      'feature_set_values'
                                  ], ['feature_set_id' => $featureSet['feature_set_id']]);
            }
        }
        
        return $this;
    }
    
    
    /**
     * Removes related additional field records by the given product id.
     *
     * @param \IdType $productId Product id of records to be removed.
     *
     * @return $this|ProductRepositoryDeleter Same instance for chained method calls.
     */
    protected function _removeAdditionalFieldRelationsByProductId(IdType $productId)
    {
        $additionalFields = $this->db->select('additional_field_id')
                                     ->from('additional_fields')
                                     ->where('item_type', 'product')
                                     ->get()
                                     ->result_array();
        array_map(function ($e) use ($productId)
        {
            $additionalFieldId = (int)$e['additional_field_id'];
            // we can use row_array(), because item_id and additional_field_id are unique in combination
            $additionalFieldValueId = (int)$this->db->select('additional_field_value_id')
                                                    ->from('additional_field_values')
                                                    ->where([
                                                                'item_id'             => $productId->asInt(),
                                                                'additional_field_id' => $additionalFieldId
                                                            ])
                                                    ->get()
                                                    ->row_array()['additional_field_value_id'];
            
            $this->db->delete('additional_field_value_descriptions',
                              ['additional_field_value_id' => $additionalFieldValueId]);
            $this->db->delete('additional_field_values', ['additional_field_value_id' => $additionalFieldValueId]);
        }, $additionalFields);
        
        return $this;
    }
    
    
    /**
     * Removes related property records by the given product id.
     *
     * @param \IdType $productId Product id of records to be removed.
     *
     * @return $this|ProductRepositoryDeleter Same instance for chained method calls.
     */
    protected function _removePropertiesByProductId(IdType $productId)
    {
        $combinationIds = array_map(function ($e)
        {
            return (int)$e['products_properties_combis_id'];
        }, $this->db->select('products_properties_combis_id')
                    ->from('products_properties_combis')
                    ->where(['products_id' => $productId->asInt()])
                    ->get()
                    ->result_array());
        foreach($combinationIds as $combinationId)
        {
            $this->db->delete('customers_basket', ['products_id LIKE' => '%x' . $combinationId]);
            $this->deleteHelper->propertyCombinationImages(new IdType($combinationId));
        }
        $propertyTables = [
            'products_properties_combis',
            'products_properties_combis_values',
            'products_properties_index'
        ];
        if (count($combinationIds) > 0)
        {
            foreach($propertyTables as $propertyTable)
            {
                $this->db->where_in('products_properties_combis_id', $combinationIds)->delete($propertyTable);
            }
        }
        
        $joinCondition          = 'a.products_id = b.products_id AND a.properties_values_id = b.properties_values_id AND '
                                  . 'a.properties_id = b.properties_id';
        $propertyAdminSelectIds = array_map(function ($e)
        {
            return (int)$e['products_properties_admin_select_id'];
        }, $this->db->distinct()
                    ->select('a.products_properties_admin_select_id, b.products_id')
                    ->from('products_properties_admin_select a')
                    ->join('products_properties_index AS b', $joinCondition, 'left outer')
                    ->where('b.products_id IS NULL')
                    ->get()
                    ->result_array());
        if(count($propertyAdminSelectIds) > 0)
        {
            $this->db->where_in('products_properties_admin_select_id', implode(',', $propertyAdminSelectIds))
                     ->delete('products_properties_admin_select');
        }
        
        return $this;
    }
    
    
    /**
     * Removes records from all dynamic personal_offer_by_customer_status_ tables by the given product id.
     *
     * @param \IdType $productId Product id of records to be removed.
     *
     * @return $this|ProductRepositoryDeleter Same instance for chained method calls.
     */
    protected function _removePersonalOffersByCustomerStatusByProductId(IdType $productId)
    {
        array_map(function ($e) use ($productId)
        {
            $this->db->delete('personal_offers_by_customers_status_' . (int)$e['customers_status_id'],
                              ['products_id' => $productId->asInt()]);
        }, $this->db->select('customers_status_id')->distinct()->from('customers_status')->get()->result_array());
        
        return $this;
    }
    
    
    /**
     * Removes review records by the given product id.
     *
     * @param \IdType $productId Product id of records to be removed.
     *
     * @return $this|ProductRepositoryDeleter Same instance for chained method calls.
     */
    protected function _removeReviewsByProductId(IdType $productId)
    {
        array_map(function ($e)
        {
            $this->db->delete('reviews_description', ['reviews_id' => (int)$e['reviews_id']]);
        }, $this->db->select('reviews_id')
                    ->from('reviews')
                    ->where(['products_id' => $productId->asInt()])
                    ->get()
                    ->result_array());
        $this->db->delete('reviews', ['products_id' => $productId->asInt()]);
        
        return $this;
    }
    
    
    /**
     * Removes records by products id in all related tables.
     *
     * @param \IdType $productId Product id of records to be removed.
     *
     * @return $this|ProductRepositoryDeleter Same instance for chained method calls.
     */
    protected function _removeRecordsByProductId(IdType $productId)
    {
        $affectedTables = [
            'products',
            'specials',
            'products_content',
            'products_images',
            'products_to_categories',
            'products_description',
            'products_attributes',
            'customers_basket',
            'customers_basket_attributes',
            'gm_prd_img_alt',
            'gm_gmotion',
            'gm_gmotion_products',
            'categories_index',
            'products_quantity_unit',
            'products_google_categories',
            'products_item_codes',
            'products_properties_admin_select'
        ];
        $this->db->delete($affectedTables, ['products_id' => $productId->asInt()]);
        
        return $this;
    }
}