/*******************************************************************************
 * Copyright (c) 2010, 2015 Google, Inc and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * 	   Sergey Prigogin (Google) - initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.internal.core.model;

import static org.eclipse.cdt.core.model.CoreModelUtil.isExcludedPath;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.model.CoreModel;
import org.eclipse.cdt.core.model.IPathEntry;
import org.eclipse.cdt.core.model.ISourceEntry;
import org.eclipse.cdt.core.settings.model.CSourceEntry;
import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
import org.eclipse.cdt.core.settings.model.ICProjectDescription;
import org.eclipse.cdt.core.settings.model.ICSourceEntry;
import org.eclipse.cdt.core.settings.model.WriteAccessException;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;

/**
 * Non-API methods for manipulating C/C++ projects.
 */
public class InternalCoreModelUtil {
	public static void addSourceEntry(IProject project, IFolder folder, boolean removeProject,
			IProgressMonitor monitor) throws CoreException {
		ICSourceEntry newEntry = new CSourceEntry(folder, null, 0); 
		ICProjectDescription des = CCorePlugin.getDefault().getProjectDescription(project, true);
		addEntryToAllCfgs(des, newEntry, removeProject);
		CCorePlugin.getDefault().setProjectDescription(project, des, false, monitor);
	}
	
	private static void addEntryToAllCfgs(ICProjectDescription des, ICSourceEntry entry,
			boolean removeProject) throws WriteAccessException, CoreException {
		ICConfigurationDescription cfgs[] = des.getConfigurations();
		for (ICConfigurationDescription cfg : cfgs) {
			ICSourceEntry[] entries = cfg.getSourceEntries();
			entries = addEntry(entries, entry, removeProject);
			cfg.setSourceEntries(entries);
		}
	}
	
	private static ICSourceEntry[] addEntry(ICSourceEntry[] entries, ICSourceEntry sourceEntry,
			boolean removeProject) {
		Set<ICSourceEntry> set = new HashSet<>();
		for (ICSourceEntry entry : entries) {
			if (removeProject && new Path(entry.getValue()).segmentCount() == 1)
				continue;
			set.add(entry);
		}
		set.add(sourceEntry);
		return set.toArray(new ICSourceEntry[set.size()]);
	}

	public static void addExclusionPatterns(IPathEntry newEntry, List<IPathEntry> existing,
			Set<IPathEntry> modifiedEntries) {
		IPath entryPath= newEntry.getPath();
		for (int i= 0; i < existing.size(); i++) {
			IPathEntry curr= existing.get(i);
			IPath currPath= curr.getPath();
			if (curr.getEntryKind() == IPathEntry.CDT_SOURCE && currPath.isPrefixOf(entryPath)) {
				IPath[] exclusionFilters= ((ISourceEntry) curr).getExclusionPatterns();
				if (!isExcludedPath(entryPath, exclusionFilters)) {
					IPath pathToExclude= entryPath.removeFirstSegments(currPath.segmentCount()).addTrailingSeparator();
					IPath[] newExclusionFilters= new IPath[exclusionFilters.length + 1];
					System.arraycopy(exclusionFilters, 0, newExclusionFilters, 0, exclusionFilters.length);
					newExclusionFilters[exclusionFilters.length]= pathToExclude;
					
					IPathEntry updated= CoreModel.newSourceEntry(currPath, newExclusionFilters);
					existing.set(i, updated);
					modifiedEntries.add(updated);
				}
			}
		}
	}
}