package org.eclipse.jst.j2ee.internal.common.classpath;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jdt.core.IClasspathContainer;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jst.common.jdt.internal.classpath.FlexibleProjectContainer;
import org.eclipse.jst.j2ee.internal.plugin.J2EEPlugin;

public class J2EEComponentClasspathContainerUtils {

	public static boolean getDefaultUseEARLibraries() {
		return J2EEPlugin.getDefault().getJ2EEPreferences().getUseEARLibraries();
	}

	public static boolean getDefaultUseWebAppLibraries() {
		return J2EEPlugin.getDefault().getJ2EEPreferences().getUseWebLibaries();
	}
	
	public static IClasspathContainer getInstalledContainer(IProject project, IPath containerPath) {
		IJavaProject jproj = JavaCore.create(project);
		IClasspathEntry entry = getInstalledContainerEntry(jproj, containerPath);
		IClasspathContainer container = null;
		if (entry != null) {
			try {
				container = JavaCore.getClasspathContainer(containerPath, jproj);
			} catch (JavaModelException e) {
				J2EEPlugin.getDefault().getLogger().logError(e);
			}
		}
		return container;
	}

	public static J2EEComponentClasspathContainer getInstalledEARLibrariesContainer(IProject project) {
		IClasspathContainer container = getInstalledContainer(project, J2EEComponentClasspathContainer.CONTAINER_PATH);
		J2EEComponentClasspathContainer earLibrariesContainer = null;
		if (null != container && container instanceof J2EEComponentClasspathContainer) {
			earLibrariesContainer = (J2EEComponentClasspathContainer) container;
		}
		return earLibrariesContainer;
	}

	public static FlexibleProjectContainer getInstalledWebAppLibrariesContainer(IProject project){
		IClasspathContainer container = getInstalledContainer(project, J2EEComponentClasspathUpdater.WEB_APP_LIBS_PATH);
		FlexibleProjectContainer webAppLibrariesContainer = null;
		if (null != container && container instanceof FlexibleProjectContainer) {
			webAppLibrariesContainer = (FlexibleProjectContainer) container;
		}
		return webAppLibrariesContainer;
	}
	
	public static IClasspathEntry getInstalledContainerEntry(IJavaProject jproj, IPath classpathContainerPath) {
		try {
			IClasspathEntry[] cpes;
			cpes = jproj.getRawClasspath();
			for (int j = 0; j < cpes.length; j++) {
				final IClasspathEntry cpe = cpes[j];
				if (cpe.getEntryKind() == IClasspathEntry.CPE_CONTAINER) {
					if (cpe.getPath().equals(classpathContainerPath)) {
						return cpe; // entry found
					}
				}
			}
		} catch (JavaModelException e) {
			J2EEPlugin.getDefault().getLogger().logError(e);
		}
		// entry not found
		return null;
	}

}