/**
 ********************************************************************************
 * Copyright (c) 2021 Robert Bosch GmbH.
 * 
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 * 
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     Robert Bosch GmbH - initial API and implementation
 ********************************************************************************
 */

package org.eclipse.app4mc.slg.commons.m2t.transformers.sw;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.function.Consumer;

import org.eclipse.app4mc.amalthea.model.ActivityGraphItem;
import org.eclipse.app4mc.amalthea.model.Component;
import org.eclipse.app4mc.amalthea.model.Group;
import org.eclipse.app4mc.slg.commons.m2t.generators.TranslationUnit;
import org.eclipse.app4mc.transformation.util.OutputBuffer;
import org.eclipse.emf.common.util.EList;
import org.eclipse.xtext.xbase.lib.CollectionLiterals;
import org.eclipse.xtext.xbase.lib.StringExtensions;

import com.google.inject.Inject;
import com.google.inject.Singleton;

@Singleton
public class GroupHeaderTransformer extends ActivityGraphItemTransformer {

	@Inject private OutputBuffer outputBuffer;
	@Inject private ActivityGraphItemTransformer psCallGraphItemTransformer;

	public static String getModuleName(final Group group) {
		return "groups";
	}

	public static String getFunctionDef(final Group group) {
		return "group_" + group.getName() + "()";
	}

	public TranslationUnit transform(final Group group, final Component component) {
		final ArrayList<?> key = CollectionLiterals.newArrayList(group, component);
		final TranslationUnit _result;
		synchronized (cache) {
			if (cache.containsKey(key)) {
				return cache.get(key);
			}
			TranslationUnit _translationUnit = new TranslationUnit();
			_result = _translationUnit;
			cache.put(key, _result);
		}
		_init_transform(_result, group, component);
		return _result;
	}

	private final HashMap<ArrayList<?>, TranslationUnit> cache = CollectionLiterals.newHashMap();

	private void _init_transform(final TranslationUnit it, final Group group, final Component component) {
		it.setPath(GroupHeaderTransformer.getModuleName(group));
		it.setCall(GroupHeaderTransformer.getFunctionDef(group));

		final LinkedHashSet<String> groupItemIncludes = new LinkedHashSet<>();
		final LinkedHashSet<String> groupItemCalls = new LinkedHashSet<>();

		EList<ActivityGraphItem> _items = null;
		if (group != null) {
			_items = group.getItems();
		}
		final Consumer<ActivityGraphItem> _function = (ActivityGraphItem item) -> {
			final TranslationUnit tmp = this.psCallGraphItemTransformer.transform(item);
			if (((!StringExtensions.isNullOrEmpty(tmp.getExtendedIncPath()))
					&& (!it.getExtendedIncPath().equals(tmp.getExtendedIncPath())))) {
				groupItemIncludes.add(tmp.getExtendedIncPath());
			}
			if (!StringExtensions.isNullOrEmpty(tmp.getCall())) {
				groupItemCalls.add(tmp.getCall());
			}
		};
		_items.forEach(_function);

		final int index = it.getExtendedIncPath().lastIndexOf(".");
		final String trimmedIncPath = it.getExtendedIncPath().substring(0, index);

		outputBuffer.appendTo("INC", trimmedIncPath, "\n//Group " + group.getName() + "----\n");

		groupItemIncludes.forEach(include -> 
			outputBuffer.appendTo("INC", trimmedIncPath, "#include \"" + include + ".h\"\n"));

		outputBuffer.appendTo("INC", trimmedIncPath, "void " + it.getCall() + ";\n");
	}

}