//  Factory.hpp
//
//  Copyright (C) 2013-2014  Jaye Evins <evins@snaught.com>
//
//  This file is part of glbarcode++.
//
//  glbarcode++ is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  glbarcode++ 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 Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with glbarcode++.  If not, see <http://www.gnu.org/licenses/>.
//

#ifndef glbarcode_Factory_hpp
#define glbarcode_Factory_hpp


#include "Barcode.hpp"

#include "TypeIdList.hpp"

#include <string>
#include <map>


namespace glbarcode
{
        /**
         * @class Factory Factory.h glbarcode/Factory.h
         *
         * Singleton Barcode factory class.
         */
        class Factory
        {

        public:
                /**
                 * Barcode creation function signature.
                 */
                using BarcodeCreateFct = Barcode* (*)();


        private:
                /**
                 * Barcode factory constructor
                 */
                Factory();


        public:
                /**
                 * Initialize barcode factory.
                 *
                 * Initializes the barcode factory and registers all built-in Barcode types.  It
                 * is optional for an application to call init(), because glbarcode++ will automatically
                 * initialize the factory on demand.
                 */
                static void init();


                /**
                 * Create barcode based on type ID string.
                 *
                 * @param[in] typeId Barcode type ID string
                 */
                static Barcode* createBarcode( const std::string& typeId );


                /**
                 * Register barcode type ID.
                 *
                 * @param[in] typeId Barcode type ID string
                 * @param[in] fct Function to create barcode object of concrete Barcode class
                 */
                static void registerType( const std::string& typeId, BarcodeCreateFct fct );


                /**
                 * Is barcode type supported?
                 *
                 * @param[in] typeId Barcode type ID string
                 */
                static bool isTypeSupported( const std::string& typeId );


                /**
                 * Get list of supported types.
                 */
                static TypeIdList getSupportedTypes();


        private:
                /**
                 * Internal register barcode type ID.
                 *
                 * @param[in] typeId Barcode type ID string
                 * @param[in] fct Function to create barcode object of concrete Barcode class
                 */
                static void internalRegisterType( const std::string& typeId, BarcodeCreateFct fct );


                /**
                 * Map barcode type strings to creation functions.
                 */
                using BarcodeTypeMap = std::map<std::string,BarcodeCreateFct>;
                static BarcodeTypeMap mBarcodeTypeMap;


                /**
                 * Supported barcode types.
                 */
                static TypeIdList mSupportedTypes;

        };

}


#endif // glbarcode_Factory_hpp