// ============================================================================
//
// Copyright (C) 2006-2012 Talend Inc. - www.talend.com
//
// This source code is available under agreement available at
// %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt
//
// You should have received a copy of the agreement
// along with this program; if not, write to Talend SA
// 9 rue Pages 92150 Suresnes, France
//
// ============================================================================
package org.talend.repository.model.migration;

import java.util.ArrayList;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.emf.ecore.resource.Resource;
import org.talend.commons.emf.EmfHelper;
import org.talend.commons.exception.PersistenceException;
import org.talend.commons.ui.runtime.exception.ExceptionHandler;
import org.talend.core.model.migration.AbstractItemMigrationTask;
import org.talend.core.model.properties.Item;
import org.talend.core.model.repository.ERepositoryObjectType;
import org.talend.core.repository.model.ProxyRepositoryFactory;
import org.talend.core.repository.utils.XmiResourceManager;
import org.talend.repository.model.IProxyRepositoryFactory;
import org.talend.repository.model.URIHelper;

/**
 * DOC nrousseau class global comment. Detailled comment
 */
public class FixProjectResourceLink extends AbstractItemMigrationTask {

    @Override
    public ExecutionResult execute(Item item) {
        if (item.getProperty().getAuthor() == null) {
            // this case shouldn't happen normally, but just in case, each item should have one author
            IProxyRepositoryFactory factory = ProxyRepositoryFactory.getInstance();
            item.getProperty().setAuthor(factory.getRepositoryContext().getUser());
        }
        if (ERepositoryObjectType.getItemType(item).isDQItemType() && !ERepositoryObjectType.getItemType(item).isDIItemType()) {
            return ExecutionResult.NOTHING_TO_DO;
        }
        if (item.getProperty().getAuthor().getLogin() != null) {
            return ExecutionResult.NOTHING_TO_DO;
        }
        // if go here, it means property got wrong link to the project.
        // (like for example item look for: ../../../talend.project, but it should be: ../../talend.project)
        IProxyRepositoryFactory factory = ProxyRepositoryFactory.getInstance();
        item.getProperty().setAuthor(factory.getRepositoryContext().getUser());

        // now we should remove wrong URI from resource manager.
        // if this bug above happen, means the resourceSet keep wrong link to the project
        XmiResourceManager manager = ProxyRepositoryFactory.getInstance().getRepositoryFactoryFromProvider().getResourceManager();
        List<Resource> toDelete = new ArrayList<Resource>();
        for (Resource resource : manager.resourceSet.getResources()) {
            if (resource.getURI().toString().contains(manager.getProjectFilename())) {
                try {
                    IFile file = URIHelper.getFile(resource.getURI());
                    if (!file.exists()) {
                        toDelete.add(resource);
                    }
                } catch (Exception e) {
                    toDelete.add(resource);
                }
            }
        }
        EmfHelper.visitChilds(item);
        try {
            factory.save(item, true);
        } catch (PersistenceException e) {
            ExceptionHandler.process(e);
        } catch (UnsupportedOperationException e1) {
            ExceptionHandler.process(e1);
        }

        manager.resourceSet.getResources().removeAll(toDelete);

        return ExecutionResult.SUCCESS_NO_ALERT;
    }

    public Date getOrder() {
        GregorianCalendar gc = new GregorianCalendar(2010, 12, 20, 12, 0, 0);
        return gc.getTime();
    }

}