package org.eclipse.jdt.internal.debug.ui.actions;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.jdt.core.IClasspathContainer;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaModel;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.debug.ui.IJavaDebugUIConstants;
import org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin;
import org.eclipse.jdt.internal.debug.ui.launcher.RuntimeClasspathViewer;
import org.eclipse.jdt.launching.IRuntimeClasspathEntry;
import org.eclipse.jdt.launching.JavaRuntime;
import org.eclipse.jdt.ui.JavaElementLabelProvider;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.Viewer;

/**
 * Adds a project to the runtime class path.
 */
public class AddProjectAction extends RuntimeClasspathAction {
	
	class ContentProvider implements IStructuredContentProvider {
		
		private List fProjects;
		
		public ContentProvider(List projects) {
			fProjects = projects;
		}
		
		/**
		 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
		 */
		public Object[] getElements(Object inputElement) {
			return fProjects.toArray();
		}

		/**
		 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
		 */
		public void dispose() {
		}

		/**
		 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
		 */
		public void inputChanged(
			Viewer viewer,
			Object oldInput,
			Object newInput) {
		}

	}	

	public AddProjectAction(RuntimeClasspathViewer viewer) {
		super(ActionMessages.getString("AddProjectAction.Add_Project_1"), viewer); //$NON-NLS-1$
	}	

	/**
	 * Prompts for a project to add.
	 * 
	 * @see IAction#run()
	 */	
	public void run() {
		List projects = getPossibleAdditions();
		
		ILabelProvider labelProvider= new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_DEFAULT);
		IStructuredContentProvider content = new ContentProvider(projects);
		ProjectSelectionDialog dialog= new ProjectSelectionDialog(getShell(),projects, content, labelProvider, ActionMessages.getString("AddProjectAction.Choose_&project(s)_to_add__3")); //$NON-NLS-1$
		dialog.setTitle(ActionMessages.getString("AddProjectAction.Project_Selection_2")); //$NON-NLS-1$
		MultiStatus status = new MultiStatus(JDIDebugUIPlugin.getUniqueIdentifier(), IJavaDebugUIConstants.INTERNAL_ERROR, ActionMessages.getString("AddProjectAction.One_or_more_exceptions_occurred_while_adding_projects._1"), null); //$NON-NLS-1$
				
		if (dialog.open() == ProjectSelectionDialog.OK) {			
			Object[] selections = dialog.getResult();
			
			List additions = new ArrayList(selections.length);
			try {
				for (int i = 0; i < selections.length; i++) {
					IJavaProject jp = (IJavaProject)selections[i];
					if (dialog.isAddRequiredProjects()) {
						collectRequiredProjects(jp, additions);
					} else {
						additions.add(jp);
					}
				}
			} catch (JavaModelException e) {
				status.add(e.getStatus());
			}
			
			List runtimeEntries = new ArrayList(additions.size());
			Iterator iter = additions.iterator();
			while (iter.hasNext()) {
				IJavaProject jp = (IJavaProject)iter.next();
				runtimeEntries.add(JavaRuntime.newProjectRuntimeClasspathEntry(jp));
				if (dialog.isAddExportedEntries()) {
					try {
						collectExportedEntries(jp, runtimeEntries);
					} catch (CoreException e) {
						status.add(e.getStatus());
					}
				}
			}
			IRuntimeClasspathEntry[] entries = (IRuntimeClasspathEntry[])runtimeEntries.toArray(new IRuntimeClasspathEntry[runtimeEntries.size()]);
			getViewer().addEntries(entries);
		}	
		
		content.dispose();
		labelProvider.dispose();			
		
		if (!status.isOK()) {
			JDIDebugUIPlugin.errorDialog(status.getMessage(), status);
		}
	}

	/**
	 * @see SelectionListenerAction#updateSelection(IStructuredSelection)
	 */
	protected boolean updateSelection(IStructuredSelection selection) {
		return getViewer().isEnabled() && !getPossibleAdditions().isEmpty();
	}
	
	/**
	 * Returns the possible projects that can be added
	 */
	protected List getPossibleAdditions() {
		IJavaProject[] projects;
		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		try {
			projects= JavaCore.create(root).getJavaProjects();
		} catch (JavaModelException e) {
			JDIDebugUIPlugin.log(e);
			projects= new IJavaProject[0];
		}
		List remaining = new ArrayList();
		for (int i = 0; i < projects.length; i++) {
			remaining.add(projects[i]);
		}
		List alreadySelected = new ArrayList();
		IRuntimeClasspathEntry[] entries = getViewer().getEntries();
		for (int i = 0; i < entries.length; i++) {
			if (entries[i].getType() == IRuntimeClasspathEntry.PROJECT) {
				IResource res = root.findMember(entries[i].getPath());
				IJavaProject jp = (IJavaProject)JavaCore.create(res);
				alreadySelected.add(jp);
			}
		}
		remaining.removeAll(alreadySelected);
		return remaining;		
	}
	
	/**
	 * Adds all projects required by <code>proj</code> to the list
	 * <code>res</code>
	 * 
	 * @param proj the project for which to compute required
	 *  projects
	 * @param res the list to add all required projects too
	 */
	protected void collectRequiredProjects(IJavaProject proj, List res) throws JavaModelException {
		if (!res.contains(proj)) {
			res.add(proj);
			
			IJavaModel model= proj.getJavaModel();
			
			IClasspathEntry[] entries= proj.getRawClasspath();
			for (int i= 0; i < entries.length; i++) {
				IClasspathEntry curr= entries[i];
				if (curr.getEntryKind() == IClasspathEntry.CPE_PROJECT) {
					IJavaProject ref= model.getJavaProject(curr.getPath().segment(0));
					if (ref.exists()) {
						collectRequiredProjects(ref, res);
					}
				}
			}
		}
	}		
	
	/**
	 * Adds all exported entries defined by <code>proj</code> to the list
	 * <code>runtimeEntries</code>.
	 * 	 * @param proj	 * @param runtimeEntries	 * @throws JavaModelException	 */
	protected void collectExportedEntries(IJavaProject proj, List runtimeEntries) throws CoreException {
		IClasspathEntry[] entries = proj.getRawClasspath();
		for (int i = 0; i < entries.length; i++) {
			IClasspathEntry entry = entries[i];
			if (entry.isExported()) {
				IRuntimeClasspathEntry rte = null;
				switch (entry.getEntryKind()) {
					case IClasspathEntry.CPE_CONTAINER:
						IClasspathContainer container = JavaCore.getClasspathContainer(entry.getPath(), proj);
						int kind = 0;
						switch (container.getKind()) {
							case IClasspathContainer.K_APPLICATION:
								kind = IRuntimeClasspathEntry.USER_CLASSES;
								break;
							case IClasspathContainer.K_SYSTEM:
								kind = IRuntimeClasspathEntry.BOOTSTRAP_CLASSES;
								break;
							case IClasspathContainer.K_DEFAULT_SYSTEM:
								kind = IRuntimeClasspathEntry.STANDARD_CLASSES;
								break;
						}
						rte = JavaRuntime.newRuntimeContainerClasspathEntry(entry.getPath(), kind);
						break;
					case IClasspathEntry.CPE_LIBRARY:
						rte = JavaRuntime.newArchiveRuntimeClasspathEntry(entry.getPath());
						rte.setSourceAttachmentPath(entry.getSourceAttachmentPath());
						rte.setSourceAttachmentRootPath(entry.getSourceAttachmentRootPath());
						break;
					case IClasspathEntry.CPE_PROJECT:
						String name = entry.getPath().segment(0);
						IProject p = ResourcesPlugin.getWorkspace().getRoot().getProject(name);
						if (p.exists()) {
							IJavaProject jp = JavaCore.create(p);
							if (jp.exists()) {
								rte = JavaRuntime.newProjectRuntimeClasspathEntry(jp);
							}
						}
						break;
					case IClasspathEntry.CPE_VARIABLE:
						rte = JavaRuntime.newVariableRuntimeClasspathEntry(entry.getPath());
						break;
					default:
						break;
				}
				if (rte != null) {
					if (!runtimeEntries.contains(rte)) {
						runtimeEntries.add(rte);
					}
				}
			}
		}
	}

}