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<?php
class DbPdoMySQL extends DbPDO {

        protected $db_rbdm = "mysql";

        protected $db_port = 3306;

        const TYPE_INTEGER = "INTEGER";

        const TYPE_DATE = "DATE";

        const TYPE_VARCHAR = "VARCHAR";

        const TYPE_DECIMAL = "DECIMAL";

        const TYPE_DATETIME = "DATETIME";

        const TYPE_CHAR = "CHAR";

        public function initialize(){

        }

        public function table_exists($table, $schema=''){
                $table = addslashes("$table");
                if($schema==''){
                        $num = $this->fetch_one("SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '$table'");
                } else {
                        $schema = addslashes("$schema");
                        $num = $this->fetch_one("SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '$table' AND TABLE_SCHEMA = '$schema'");
                }
                return $num[0];
        }

        public function limit($sql){
                $params = Util::getParams(func_get_args());
                $sql_new = $sql;
        
                if(isset($params['limit']) && is_numeric($params['limit'])){
                        $sql_new.=" LIMIT $params[limit]";
                }
                
                if(isset($params['offset']) && is_numeric($params['offset'])){
                        $sql_new.=" OFFSET $params[offset]";
                }
                
                return $sql_new;
        }
        
        public function drop_table($table, $if_exists=true){
                if($if_exists){
                        return $this->query("DROP TABLE IF EXISTS $table");
                } else {
                        return $this->query("DROP TABLE $table");
                }
        }

        public function create_table($table, $definition, $index=array()){
                $create_sql = "CREATE TABLE $table (";
                if(!is_array($definition)){
                        new KumbiaException("Definici&oacute;n invalida para crear la tabla '$table'");
                        return false;
                }
                $create_lines = array();
                $index = array();
                $unique_index = array();
                $primary = array();
                $not_null = "";
                $size = "";
                foreach($definition as $field => $field_def){
                        if(isset($field_def['not_null'])){
                                $not_null = $field_def['not_null'] ? 'NOT NULL' : '';
                        } else {
                                $not_null = "";
                        }
                        if(isset($field_def['size'])){
                                $size = $field_def['size'] ? '('.$field_def['size'].')' : '';
                        } else {
                                $size = "";
                        }
                        if(isset($field_def['index'])){
                                if($field_def['index']){
                                        $index[] = "INDEX(`$field`)";
                                }
                        }
                        if(isset($field_def['unique_index'])){
                                if($field_def['unique_index']){
                                        $index[] = "UNIQUE(`$field`)";
                                }
                        }
                        if(isset($field_def['primary'])){
                                if($field_def['primary']){
                                        $primary[] = "`$field`";
                                }
                        }
                        if(isset($field_def['auto'])){
                                if($field_def['auto']){
                                        $field_def['extra'] = isset($field_def['extra']) ? $field_def['extra']." AUTO_INCREMENT" :  "AUTO_INCREMENT";
                                }
                        }
                        if(isset($field_def['extra'])){
                                $extra = $field_def['extra'];
                        } else {
                                $extra = "";
                        }
                        $create_lines[] = "`$field` ".$field_def['type'].$size.' '.$not_null.' '.$extra;
                }
                $create_sql.= join(',', $create_lines);
                $last_lines = array();
                if(count($primary)){
                        $last_lines[] = 'PRIMARY KEY('.join(",", $primary).')';
                }
                if(count($index)){
                        $last_lines[] = join(',', $index);
                }
                if(count($unique_index)){
                        $last_lines[] = join(',', $unique_index);
                }
                if(count($last_lines)){
                        $create_sql.= ','.join(',', $last_lines).')';
                }
                return $this->query($create_sql);

        }

        public function list_tables(){
                return $this->fetch_all("SHOW TABLES");
        }

        public function describe_table($table, $schema=''){
                if($schema==''){
                        $describe = $this->fetch_all("DESCRIBE `$table`");
                } else {
                        $describe = $this->fetch_all("DESCRIBE `$schema`.`$table`");
                }
                $final_describe = array();
                foreach($describe as $key => $value){
                        $final_describe[] = array(
                                "Field" => $value["field"],
                                "Type" => $value["type"],
                                "Null" => $value["null"],
                                "Key" => $value["key"]
                        );
                }
                return $final_describe;
        }

}

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