/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */
package org.dspace.versioning;

import org.dspace.core.Context;
import org.dspace.storage.rdbms.DatabaseManager;
import org.dspace.storage.rdbms.TableRow;

import java.sql.SQLException;
import java.util.List;

/**
 *
 *
 * @author Fabio Bolognesi (fabio at atmire dot com)
 * @author Mark Diggory (markd at atmire dot com)
 * @author Ben Bosman (ben at atmire dot com)
 */
public class VersionHistoryDAO
{

    protected final static String TABLE_NAME="versionhistory";
    protected final static String VERSION_HISTORY_ID = "versionhistory_id";


    public VersionHistoryImpl create(Context context)
    {
        try {
            TableRow row = DatabaseManager.create(context, TABLE_NAME);
            VersionHistoryImpl vh = new VersionHistoryImpl(context, row);

            //TODO Do I have to manage the event?
            //context.addEvent(new Event(Event.CREATE, Constants.EPERSON, e.getID(), null));

            return vh;

        } catch (SQLException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }



    public VersionHistoryImpl find(Context context, int itemID, VersionDAO versionDAO)
    {
        try {

            Version version = versionDAO.findByItemId(context, itemID);

            if(version==null)
            {
                return null;
            }

            VersionHistoryImpl fromCache = (VersionHistoryImpl) context.fromCache(VersionHistoryImpl.class, version.getVersionHistoryID());
            if (fromCache != null)
            {
                return fromCache;
            }

            TableRow row = DatabaseManager.find(context, TABLE_NAME, version.getVersionHistoryID());

            VersionHistoryImpl vh = new VersionHistoryImpl(context, row);
            List<Version> versions= versionDAO.findByVersionHistory(context, vh.getVersionHistoryId());
            vh.setVersions(versions);
            return vh;
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        }

    }

    public VersionHistoryImpl findById(Context context, int id, VersionDAO versionDAO)
    {

        try {
            TableRow row = DatabaseManager.find(context, TABLE_NAME, id);

            if (row == null) return null;

            VersionHistoryImpl fromCache = (VersionHistoryImpl) context.fromCache(VersionHistoryImpl.class, row.getIntColumn(VERSION_HISTORY_ID));

            if (fromCache != null)
            {
                return fromCache;
            }

            VersionHistoryImpl versionHistoryImpl = new VersionHistoryImpl(context, row);

            List<Version> versions= versionDAO.findByVersionHistory(context, versionHistoryImpl.getVersionHistoryId());
            versionHistoryImpl.setVersions(versions);
            return versionHistoryImpl;
        } catch (SQLException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }


    public void delete(Context c, int versionHistoryID, VersionDAO versionDAO)
    {
        try {
            VersionHistoryImpl history = findById(c, versionHistoryID, versionDAO);
            DatabaseManager.delete(c, history.getMyRow());
        } catch (SQLException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }


}