<?php
class ProductSale extends ProductSaleCore
{
	public static function getBestSalesVp($id_lang, $pageNumber = 0, $nbProducts = 10, $orderBy=NULL, $orderWay=NULL)
	{
		$id_category_vp = self::_getIdCategoryPrivateSales();
		// $id_category_vp = array_unique($id_category_vp);

		if ($pageNumber < 0) $pageNumber = 0;
		if ($nbProducts < 1) $nbProducts = 10;
		if (empty($orderBy) || $orderBy == 'position') $orderBy = 'sales';
		if (empty($orderWay)) $orderWay = 'DESC';

		$groups = FrontController::getCurrentCustomerGroups();
		$sqlGroups = (count($groups) ? 'IN ('.implode(',', $groups).')' : '= 1');

		$result = array();
		foreach ($id_category_vp as $key => $sale) {
			$categories = array($sale['id_category']);

			$children = Category::getChildren($sale['id_category'] , 1);
			if(count($children) > 0){
				foreach ($children as $key => $child) {
					$categories[] = $child['id_category'];
				}
			}

			$sale_product = Db::getInstance(_PS_USE_SQL_SLAVE_)->ExecuteS('
				SELECT 
					DISTINCT(p.id_product),
					pl.`description`, pl.`description_short`, pl.`link_rewrite`, pl.`meta_description`, pl.`meta_keywords`, pl.`meta_title`, pl.`name`, m.`name` AS manufacturer_name, p.`id_manufacturer` as id_manufacturer,
					i.`id_image`, il.`legend`,
					ps.`quantity` AS sales, t.`rate`, pl.`meta_keywords`, pl.`meta_title`, pl.`meta_description`,
					DATEDIFF(p.`date_add`, DATE_SUB(NOW(), INTERVAL '.(Validate::isUnsignedInt(Configuration::get('PS_NB_DAYS_NEW_PRODUCT')) ? Configuration::get('PS_NB_DAYS_NEW_PRODUCT') : 20).' DAY)) > 0 AS new
				FROM `'._DB_PREFIX_.'product` p	
				LEFT JOIN `'._DB_PREFIX_.'product_lang` pl ON (p.`id_product` = pl.`id_product` AND pl.`id_lang` = '.(int)($id_lang).')
				LEFT JOIN `'._DB_PREFIX_.'image` i ON (i.`id_product` = p.`id_product` AND i.`cover` = 1)
				LEFT JOIN `'._DB_PREFIX_.'image_lang` il ON (i.`id_image` = il.`id_image` AND il.`id_lang` = '.(int)($id_lang).')
				LEFT JOIN `'._DB_PREFIX_.'manufacturer` m ON (m.`id_manufacturer` = p.`id_manufacturer`)
				LEFT JOIN `'._DB_PREFIX_.'tax_rule` tr ON (p.`id_tax_rules_group` = tr.`id_tax_rules_group`
				                                           AND tr.`id_country` = '.(int)Country::getDefaultCountryId().'
			                                           	   AND tr.`id_state` = 0)
			    LEFT JOIN `'._DB_PREFIX_.'tax` t ON (t.`id_tax` = tr.`id_tax`)
			    LEFT JOIN `'._DB_PREFIX_.'category_product` cp ON (cp.`id_product` = p.`id_product`)
			    LEFT JOIN `'._DB_PREFIX_.'product_sale` ps ON (ps.`id_product` = p.`id_product`)
				WHERE p.`active` = 1
				AND p.`quantity` > 0
				AND p.id_product  = (
						SELECT ps.id_product
						FROM `'._DB_PREFIX_.'product_sale` ps
						INNER JOIN  `'._DB_PREFIX_.'category_product` cp ON ( cp.id_product = ps.id_product ) 
						WHERE cp.id_category IN ('. implode(',', $categories).')
						ORDER BY ps.quantity DESC 
						LIMIT 1
					)
				');
			

			if (!$sale_product)
				continue;
			
			$data = Product::getProductsProperties($id_lang, $sale_product, false);
			$result[] = $data[0];
			unset($categories);
		}
		$final_array = self::bubble_sort($result);
		$final_array = array_reverse($final_array);
		
		return array_slice($final_array,0,$nbProducts);
	}

	public static function bubble_sort($array)
	{
	    $i = count($array);
	    if ($i <= 0) return false;
	    $ok = false;
	    do
	    {
	        $ok = false;
	        for($j=$i-1; $j!=0; $j--)
	        {
	            if ($array[$j]['sales'] < $array[$j-1]['sales'])
	            {
	            	$tmp = $array[$j];
	            	$array[$j] = $array[$j-1];
	            	$array[$j-1] = $tmp;
	            	$ok = true;
	            }
	        }
	    }
	    while($ok);
	    return $array;
	}
	
	private static function _getIdCategoryPrivateSales()
	{
		global $site_version_front;
		$query = '
			SELECT p.`id_category`
			FROM `'._DB_PREFIX_.'privatesale` p
			LEFT JOIN `'._DB_PREFIX_.'privatesale_site_version` v ON v.`id_sale` = p.`id_sale`
			WHERE p.`date_start` <= NOW()
			AND p.`date_end` >= NOW()
			AND v.`version` = "'.pSql($site_version_front).'"
		';
		return $sales = Db::getInstance()->ExecuteS($query);
	}
}