<?php if ( !defined('ABS_PATH') ) exit('ABS_PATH is not loaded. Direct access is not allowed.') ;

    /*
     *      OSCLass – software for creating and publishing online classified
     *                           advertising platforms
     *
     *                        Copyright (C) 2010 OSCLASS
     *
     *       This program is free software: you can redistribute it and/or
     *     modify it under the terms of the GNU Affero General Public License
     *     as published by the Free Software Foundation, either version 3 of
     *            the License, or (at your option) any later version.
     *
     *     This program is distributed in the hope that it will be useful, but
     *         WITHOUT ANY WARRANTY; without even the implied warranty of
     *        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     *             GNU Affero General Public License for more details.
     *
     *      You should have received a copy of the GNU Affero General Public
     * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
     */
    
    /**
     * Model database for CityStats table
     *
     * @package OSClass
     * @subpackage Model
     * @since 2.4
     */
    class CityStats extends DAO
    {
        /**
         * It references to self object: CityStats.
         * It is used as a singleton
         *
         * @access private
         * @since 2.4
         * @var CityStats
         */
        private static $instance ;

        /**
        * It creates a new CityStats object class if it has been created
        * before, it return the previous object
        *
        * @access public
        * @since 2.4
        * @return CategoryStats
        */
        public static function newInstance()
        {
            if( !self::$instance instanceof self ) {
                self::$instance = new self ;
            }
            return self::$instance ;
        }

        /**
         * Set data related to t_city_stats table
         * 
         * @access public
         * @since 2.4
         */
        function __construct()
        {
            parent::__construct();
            $this->setTableName('t_city_stats') ;
            $this->setPrimaryKey('fk_i_city_id') ;
            $this->setFields( array('fk_i_city_id', 'i_num_items') ) ;
        }
        
        /**
         * Increase number of city items, given a city id
         *
         * @access public
         * @since 2.4
         * @param int $cityId City id 
         * @return int number of affected rows, id error occurred return false
         */
        public function increaseNumItems($cityId) 
        {
            if(!is_numeric($cityId)) {
                return false;
            }
            return $this->dao->query(sprintf('INSERT INTO %s (fk_i_city_id, i_num_items) VALUES (%d, 1) ON DUPLICATE KEY UPDATE i_num_items = i_num_items + 1', $this->getTableName(), $cityId));
        }
        
        /**
         * Increase number of city items, given a city id
         * 
         * @access public
         * @since 2.4
         * @param int $cityId City id 
         * @return int number of affected rows, id error occurred return false
         */
        public function decreaseNumItems($cityId) 
        {
            if(!is_numeric($cityId)) {
                return false;
            }
            
            $this->dao->select( 'i_num_items' ) ;
            $this->dao->from( $this->getTableName() ) ;
            $this->dao->where( $this->getPrimaryKey(), $cityId ) ;
            $result       = $this->dao->get() ;
            $cityStat = $result->row() ; 

            if( isset( $cityStat['i_num_items'] ) ) {
                $this->dao->from( $this->getTableName() ) ;
                $this->dao->set( 'i_num_items', 'i_num_items - 1', false ) ;
                $this->dao->where( 'i_num_items > 0' ) ;
                $this->dao->where( 'fk_i_city_id', $cityId ) ;

                return $this->dao->update() ;
            } 

            return false;
        }

        /**
         * Set i_num_items, given a city id
         *
         * @access public
         * @since 2.4
         * @param type $cityID
         * @param type $numItems
         * @return type 
         */
        public function setNumItems($cityID, $numItems)
        {
            return $this->dao->query("INSERT INTO ".$this->getTableName()." (fk_i_city_id, i_num_items) VALUES ($cityID, $numItems) ON DUPLICATE KEY UPDATE i_num_items = ".$numItems);
        }

        /**
         * Find stats by city id
         * 
         * @access public
         * @since 2.4
         * @param int $cityId city id
         * @return array
         */
        public function findByCityId($cityId) 
        {
            return $this->findByPrimaryKey($cityId);
        }
        
        /**
         *
         * @param type $regionId
         * @return type 
         */
        public function deleteByRegion($regionId)
        {
            return $this->dao->query('DELETE FROM '.DB_TABLE_PREFIX.'t_city_stats WHERE fk_i_city_id IN (SELECT pk_i_id FROM '.DB_TABLE_PREFIX.'t_city WHERE fk_i_region_id = '.$regionId.');');
        }
        
        /**
         * Return a list of cities and counter items.
         * Can be filtered by region and num_items,
         * and ordered by city_name or items counter
         * $order = 'city_name ASC' OR $oder = 'items DESC'
         *
         * @param int $region
         * @param string $zero
         * @param string $order
         * @return array
         */
        public function listCities($region = null, $zero = ">", $order = "city_name ASC") 
        {
            $this->dao->select($this->getTableName().'.fk_i_city_id as city_id, '.$this->getTableName().'.i_num_items as items, '.DB_TABLE_PREFIX.'t_city.s_name as city_name') ;
            $this->dao->from( $this->getTableName() ) ;
            $this->dao->join(DB_TABLE_PREFIX.'t_city', $this->getTableName().'.fk_i_city_id = '.DB_TABLE_PREFIX.'t_city.pk_i_id', 'LEFT') ;
            $this->dao->where('i_num_items '.$zero.' 0' ) ;
            if( is_numeric($region) ) {
                $this->dao->where(DB_TABLE_PREFIX.'t_city.fk_i_region_id = '.$region) ;
            }       
            $this->dao->orderBy($order) ;
            
            $rs = $this->dao->get() ;
            
            if($rs === false) {
                return array() ;
            }
            return $rs->result() ;
        }
        
        /**
         * Calculate the total items that belong to city id 
         *
         * @param type $cityId
         * @return int total items
         */
        function calculateNumItems($cityId)
        {
            $sql  = 'SELECT count(*) as total FROM '.DB_TABLE_PREFIX.'t_item_location, '.DB_TABLE_PREFIX.'t_item, '.DB_TABLE_PREFIX.'t_category ' ;
            $sql .= 'WHERE '.DB_TABLE_PREFIX.'t_item_location.fk_i_city_id = '.$cityId.' AND ' ;
            $sql .= DB_TABLE_PREFIX.'t_item.pk_i_id = '.DB_TABLE_PREFIX.'t_item_location.fk_i_item_id AND ' ;
            $sql .= DB_TABLE_PREFIX.'t_category.pk_i_id = '.DB_TABLE_PREFIX.'t_item.fk_i_category_id AND ' ;
            $sql .= DB_TABLE_PREFIX.'t_item.b_active = 1 AND '.DB_TABLE_PREFIX.'t_item.b_enabled = 1 AND '.DB_TABLE_PREFIX.'t_item.b_spam = 0 AND ' ;            
            $sql .= '('.DB_TABLE_PREFIX.'t_item.b_premium = 1 || '.DB_TABLE_PREFIX.'t_item.dt_expiration >= \''.date('Y-m-d H:i:s').'\' ) AND ' ;
            $sql .= DB_TABLE_PREFIX.'t_category.b_enabled = 1 ' ;
            
            $return = $this->dao->query($sql);
            if($return === false) {
                return 0;
            }
            
            if($return->numRows() > 0) {
                $aux = $return->result() ;
                return $aux[0]['total'] ;
            }
            
            return 0;
        }
    }

    /* file end: ./oc-includes/osclass/model/CityStats.php */
?>