/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM 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
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.corext.refactoring.changes;

import org.eclipse.core.resources.mapping.ResourceMapping;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IProjectFragment;
import org.eclipse.dltk.core.IScriptFolder;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.internal.corext.refactoring.base.DLTKChange;
import org.eclipse.dltk.internal.corext.refactoring.reorg.INewNameQuery;
import org.eclipse.dltk.internal.ui.model.DLTKElementResourceMapping;
import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.ltk.core.refactoring.participants.ReorgExecutionLog;

abstract class PackageReorgChange extends DLTKChange {

	private String fPackageHandle;
	private String fDestinationHandle;
	private INewNameQuery fNameQuery;

	PackageReorgChange(IScriptFolder pack, IProjectFragment dest,
			INewNameQuery nameQuery) {
		fPackageHandle = pack.getHandleIdentifier();
		fDestinationHandle = dest.getHandleIdentifier();
		fNameQuery = nameQuery;
	}

	abstract Change doPerformReorg(IProgressMonitor pm) throws ModelException;

	@Override
	public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
		// it is enough to check the package only since package reorg changes
		// are not undoable. Don't check for read only here since
		// we already ask for user confirmation and moving a read
		// only package doesn't go thorugh validate edit (no
		// file content is modified).
		return isValid(pm, NONE);
	}

	@Override
	public final Change perform(IProgressMonitor pm) throws CoreException {
		pm.beginTask(getName(), 1);
		try {
			IScriptFolder pack = getPackage();
			ResourceMapping mapping = DLTKElementResourceMapping.create(pack);
			final Change result = doPerformReorg(pm);
			markAsExecuted(pack, mapping);
			return result;
		} finally {
			pm.done();
		}
	}

	@Override
	public Object getModifiedElement() {
		return getPackage();
	}

	IProjectFragment getDestination() {
		return (IProjectFragment) DLTKCore.create(fDestinationHandle);
	}

	IScriptFolder getPackage() {
		return (IScriptFolder) DLTKCore.create(fPackageHandle);
	}

	String getNewName() {
		if (fNameQuery == null) {
			return null;
		}
		return fNameQuery.getNewName();
	}

	private void markAsExecuted(IScriptFolder pack, ResourceMapping mapping) {
		ReorgExecutionLog log = getAdapter(ReorgExecutionLog.class);
		if (log != null) {
			log.markAsProcessed(pack);
			log.markAsProcessed(mapping);
		}
	}
}