/*
 * Copyright (c) 2005, 2010 Borland Software Corporation 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:
 *    Artem Tikhomirov (Borland) - initial API and implementation
 */
package org.eclipse.gmf.tests;

import java.util.ArrayList;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IncrementalProjectBuilder;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.jdt.core.IJavaModelMarker;

/**
 * @author artem
 *
 */
public class CompileUtil {

	public IStatus build(IProject project) {
		try {
			JobTracker jt = new JobTracker();
			jt.start();
			project.build(IncrementalProjectBuilder.FULL_BUILD, new NullProgressMonitor());
			System.err.println("Build of " + project.getName() + " triggered " + jt.getJobsCount() + " jobs");
			jt.dump();
			jt.freeze();
			Utils.dispatchDisplayMessages(jt.getNonEmptyCondition(), 2);
			IMarker[] compileErrors = getJavaErrors(project);
			if (compileErrors.length > 0) {
				StringBuffer sb = new StringBuffer();
				sb.append(project.getName()).append(" has compilation problems:\n");
				String errorsMsg = formatErrors(sb, compileErrors);
				return new Status(Status.ERROR, Plugin.getPluginID(), 0, errorsMsg, null);
			}
			return Status.OK_STATUS;
		} catch (CoreException ex) {
			System.err.println("============> CompileUtil.build:");
			ex.printStackTrace(System.err);
			return ex.getStatus();
		} catch (Exception ex) {
			ex.printStackTrace(); // record e.g. NPE
			return Status.CANCEL_STATUS;
		}
	}

	private IMarker[] collectJavaMarkers(IProject p) throws CoreException {
		return p.findMarkers(IJavaModelMarker.JAVA_MODEL_PROBLEM_MARKER, true, IResource.DEPTH_INFINITE);
	}

	private IMarker[] getJavaErrors(IProject p) throws CoreException {
		return filterSevereMarkers(collectJavaMarkers(p));
	}

	private IMarker[] filterSevereMarkers(IMarker[] problems) throws CoreException {
		ArrayList<IMarker> rv = new ArrayList<IMarker>(problems.length);
		for (int i = 0; i < problems.length; i++) {
			if (IMarker.SEVERITY_ERROR == ((Integer) problems[i].getAttribute(IMarker.SEVERITY)).intValue()) {
				rv.add(problems[i]);
			}
		}
		return rv.toArray(new IMarker[rv.size()]);
	}

	private String formatErrors(StringBuffer sb, IMarker[] compileErrors) {
		for (int i = 0; i < compileErrors.length; i++) {
			try {
				sb.append(compileErrors[i].getResource().getName());
				sb.append(':');
				sb.append(compileErrors[i].getAttribute(IMarker.MESSAGE));
			} catch (CoreException ex) {
				sb.append("--ex:");
				sb.append(ex.getMessage());
			}
			sb.append(",\n");
		}
		return sb.toString();
	}
}