/*******************************************************************************
 * Copyright (c) 2014 Bosch Software Innovations GmbH and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 *
 * The Eclipse Public License is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * The Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 * Bosch Software Innovations GmbH - Please refer to git log
 *
 *******************************************************************************/
package org.eclipse.vorto.codegen.internal.handler;

import static org.eclipse.vorto.codegen.internal.extensioninterface.PopulateGeneratorsMenu.GENERATE_ALL;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.vorto.api.common.project.FunctionBlockProjectFactory;
import org.eclipse.vorto.api.common.project.IProjectSelectionFactory;
import org.eclipse.vorto.api.common.project.IoTModelProject;
import org.eclipse.vorto.codegen.api.ICodeGenerator;
import org.eclipse.vorto.functionblock.FunctionblockModel;


public class EvaluateContributionsHandler extends AbstractHandler {

	private static final String GENERATOR_ID = ICodeGenerator.GENERATOR_ID;

	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {
		IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();
		final String generatorIdentifier = event
				.getParameter("org.eclipse.vorto.codegen.generator.commandParameter");
		evaluate(extensionRegistry, generatorIdentifier);
		return null;
	}

	private void evaluate(IExtensionRegistry registry, String generatorName) {

		final IConfigurationElement[] configElements = getUserSelectedGenerators(
				registry, generatorName);
		final FunctionblockModel model = getSelectedFbDesignProject()
				.getFunctionBlockModel();

		GenerateService.runGenerateCodeInBackground(configElements, model);
	}

	private IConfigurationElement[] getUserSelectedGenerators(
			IExtensionRegistry registry, String generatorIdentifier) {
		IConfigurationElement[] configurationElements;
		if (GENERATE_ALL.equals(generatorIdentifier)) {
			configurationElements = registry
					.getConfigurationElementsFor(GENERATOR_ID);
		} else {
			IExtension extension = registry.getExtension(
					ICodeGenerator.GENERATOR_ID, generatorIdentifier);
			configurationElements = extension.getConfigurationElements();
		}
		return configurationElements;
	}

	private IoTModelProject getSelectedFbDesignProject() {
		try {
			FunctionBlockProjectFactory factory = FunctionBlockProjectFactory
					.getInstance();

			IProject projectFromSelection = IProjectSelectionFactory
					.getInstance().getProjectFromSelection();
			if (projectFromSelection != null)
				return factory.getProject(projectFromSelection,
						IoTModelProject.class);

		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

}