/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.corext.buildpath;

import java.lang.reflect.InvocationTargetException;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.dltk.core.IBuildpathEntry;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.internal.ui.wizards.NewWizardMessages;


/**
 * Operation to reset all changes and go back to the initial project state.
 */
public class ResetAllOperation extends BuildpathModifierOperation {
    private IBuildpathEntry[] fEntries;
    /**
     * Constructor
     *
     * @param listener a <code>IBuildpathModifierListener</code> that is notified about
     * changes on buildpath entries or <code>null</code> if no such notification is
     * necessary.
     * @param informationProvider a provider to offer information to the action
     *
     * @see IBuildpathInformationProvider
     * @see BuildpathModifier
     */
    public ResetAllOperation(IBuildpathModifierListener listener, IBuildpathInformationProvider informationProvider) {
        super(listener, informationProvider, NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_Reset_tooltip, IBuildpathInformationProvider.RESET_ALL);
    }

    /**
     * Method which runs the actions with a progress monitor.<br>
     *
     * This operation requires the following query from the provider:
     * <li>IOutputFolderQuery</li>
     *
     * @param monitor a progress monitor, can be <code>null</code>
     */
	@Override
	public void run(IProgressMonitor monitor) throws InvocationTargetException {
        fException= null;
        try {
            fInformationProvider.getScriptProject().setRawBuildpath(fEntries, monitor);
            fInformationProvider.deleteCreatedResources();
            fEntries= null;
        } catch (CoreException e) {
            fException= e;
        }

        super.handleResult(null, monitor);
    }

    /**
     * Find out whether this operation can be executed on
     * the provided list of elements.
     *
     * @param elements a list of elements
     * @param types an array of types for each element, that is,
     * the type at position 'i' belongs to the selected element
     * at position 'i'
     *
     * @return <code>true</code> if the operation can be
     * executed on the provided list of elements, <code>
     * false</code> otherwise.
     * @throws ModelException
     */
	@Override
	public boolean isValid(List elements, int[] types) throws ModelException {
        IScriptProject project= fInformationProvider.getScriptProject();
        if (project == null)
            return false;
        if (fEntries == null) {
            fEntries= project.getRawBuildpath();
        }
        IBuildpathEntry[] currentEntries= project.getRawBuildpath();
        if (currentEntries.length != fEntries.length)
            return true;
        for(int i= 0; i < fEntries.length; i++) {
            if (!fEntries[i].equals(currentEntries[i]))
                return true;
        }
        return false;
    }

    /**
     * Get a description for this operation. In this particual case
     * the description is independent of the selection and it's
     * provided type.
     *
     * @param type the type of the selected object, must be a constant of
     * <code>DialogPackageExplorerActionGroup</code>.
     * @return a string describing the operation
     */
	@Override
	public String getDescription(int type) {
        return NewWizardMessages.PackageExplorerActionGroup_FormText_Default_ResetAll;
    }
}