/**
 * Tigase HTTP API component - Tigase HTTP API component
 * Copyright (C) 2013 Tigase, Inc. (office@tigase.com)
 *
 * 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, version 3 of the License.
 *
 * 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. Look for COPYING file in the top folder.
 * If not, see http://www.gnu.org/licenses/.
 */
package tigase.http.modules.rest

import tigase.http.rest.Handler
import tigase.kernel.beans.Bean
import tigase.kernel.core.Kernel

import java.util.logging.Level
import java.util.logging.Logger

public class HandlersLoader {

	private static final Logger log = Logger.getLogger(HandlersLoader.class.getCanonicalName());
	//private static final def groovyClassLoader = new GroovyClassLoader();

	private static HandlersLoader instance;

	public static synchronized HandlersLoader getInstance() {
		if (instance == null) {
			instance = new HandlersLoader()
		};
		return instance;
	}

	public def loadHandler(GroovyClassLoader classLoader, File file, Kernel kernel) {
		Class cls = classLoader.parseClass(file);
		Object scriptInstance;
		if (cls.getAnnotation(Bean.class) != null) {
			kernel.registerBean(cls).exec();
			scriptInstance = kernel.getInstance(cls);
		} else {
			scriptInstance = cls.newInstance()
		}
		Handler handler = (Handler) scriptInstance;
		handler.pathName = file.getAbsolutePath();
		return handler;
	}

	public def loadHandlers(Kernel kernel, List<File> scripts) {
		def classLoader = new GroovyClassLoader(this.getClass().getClassLoader());
		def newHandlers = [ ];

		scripts.each { file ->
			try {
				log.info("loading handler from file = " + file.getCanonicalPath())
				newHandlers.add(loadHandler(classLoader, file, kernel))
				log.info("handler loaded");
			} catch (Throwable ex) {
				log.log(Level.SEVERE, "Exception loading handler from script = " + file.getAbsolutePath(), ex);
			}
		}

		return newHandlers;
	}

	public def loadHandlersFromDirectory(File dir) {
		log.info("loading handlers from scripts from = " + dir.getCanonicalPath())
		def scriptFiles = dir.listFiles().findAll { it.getName().endsWith(".groovy") }
		def handlers = loadHandlers(scriptFiles);
		return handlers;
	}

}
