/*
 * Copyright 2009-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.eclipse.actions;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.codehaus.groovy.eclipse.core.GroovyCore;
import org.codehaus.groovy.eclipse.core.model.GroovyRuntime;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

/**
 * RemoveGroovyNatureAction is responsible for removing the Groovy nature to a java
 * project.
 *
 * @author Andrew
 */
public class RemoveGroovyNatureAction implements IObjectActionDelegate {
    private List<IProject> currSelected = new LinkedList<IProject>();

    private IWorkbenchPart targetPart;

    private boolean shouldAskToRemoveJars = true;


    public void run(final IAction action) {

        if (currSelected != null && currSelected.size() > 0) {
            GroovyCore.trace("RemoveGroovySupportAction.run()");

            for (IProject project : currSelected) {
                GroovyCore.trace("   to " + project.getName());
                try {
					GroovyRuntime.removeGroovyNature(project);
					IJavaProject javaProject = JavaCore.create(project);
					if (GroovyRuntime.hasGroovyClasspathContainer(javaProject)) {
					    boolean shouldRemove;
					    if (shouldAskToRemoveJars) {
					        shouldRemove = MessageDialog.openQuestion(getShell(), "Remove Groovy jars?", "Do you want to also remove the groovy runtime jars from project " + project.getName() + "?");
					    } else {
					        // do automatically during testing
					        shouldRemove = true;
					    }
					    if (shouldRemove) {
					        GroovyRuntime.removeGroovyClasspathContainer(javaProject);
                            GroovyRuntime.removeLibraryFromClasspath(javaProject, GroovyRuntime.DSLD_CONTAINER_ID);
					    }
					}
				} catch (CoreException e) {
					GroovyCore.logException("Error removing Groovy nature", e);
				}
            }
        }
    }

    /**
     * @return
     */
    private Shell getShell() {
        return targetPart != null ? targetPart.getSite().getShell() : Display.getDefault().getActiveShell();
    }

    /**
     * @see IEditorActionDelegate#selectionChanged
     */
    public void selectionChanged(final IAction action, final ISelection selection) {
        currSelected.clear();
        List<IProject> newSelected = new LinkedList<IProject>();
        boolean enabled = true;
        if (selection instanceof IStructuredSelection) {
            IStructuredSelection newSelection = (IStructuredSelection) selection;
            for (Iterator<?> iter = newSelection.iterator(); iter.hasNext();) {
                Object object = iter.next();
                if (object instanceof IAdaptable) {
                    @SuppressWarnings("cast")
                    IProject project = (IProject) ((IAdaptable)object).getAdapter(IProject.class);
                    if(project != null) {
                        newSelected.add(project);
                    } else {
                        enabled = false;
                        break;
                    }
                } else {
                    enabled = false;
                    break;
                }
            }
            if (action != null) {
                action.setEnabled(enabled);
            }
        }

        if (enabled) {
            this.currSelected = newSelected;
        }
    }

    /**
     * @see IEditorActionDelegate#setActivePart
     */
    public void setActivePart(final IAction action, final IWorkbenchPart targetPart) {
        this.targetPart = targetPart;
    }

    // for testing ensure there is no ui modal dialog
    public void doNotAskToRemoveJars() {
        this.shouldAskToRemoveJars = false;
    }
}