/*
 * LinShare is an open source filesharing software, part of the LinPKI software
 * suite, developed by Linagora.
 * 
 * Copyright (C) 2015 LINAGORA
 * 
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version, provided you comply with the Additional Terms applicable for
 * LinShare software by Linagora pursuant to Section 7 of the GNU Affero General
 * Public License, subsections (b), (c), and (e), pursuant to which you must
 * notably (i) retain the display of the “LinShare™” trademark/logo at the top
 * of the interface window, the display of the “You are using the Open Source
 * and free version of LinShare™, powered by Linagora © 2009–2015. Contribute to
 * Linshare R&D by subscribing to an Enterprise offer!” infobox and in the
 * e-mails sent with the Program, (ii) retain all hypertext links between
 * LinShare and linshare.org, between linagora.com and Linagora, and (iii)
 * refrain from infringing Linagora intellectual property rights over its
 * trademarks and commercial brands. Other Additional Terms apply, see
 * <http://www.linagora.com/licenses/> for more details.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Affero General Public License and
 * its applicable Additional Terms for LinShare along with this program. If not,
 * see <http://www.gnu.org/licenses/> for the GNU Affero General Public License
 * version 3 and <http://www.linagora.com/licenses/> for the Additional Terms
 * applicable to LinShare software.
 */
package org.linagora.linshare.core.service.impl;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Set;

import org.linagora.linshare.core.domain.entities.Account;
import org.linagora.linshare.core.domain.entities.DocumentEntry;
import org.linagora.linshare.core.domain.entities.ShareExpiryRule;
import org.linagora.linshare.core.domain.objects.TimeUnitValueFunctionality;
import org.linagora.linshare.core.service.FunctionalityReadOnlyService;
import org.linagora.linshare.core.service.ShareExpiryDateService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ShareExpiryDateServiceImpl implements ShareExpiryDateService {
	private static final Logger logger = LoggerFactory.getLogger(ShareExpiryDateServiceImpl.class);

	private final FunctionalityReadOnlyService functionalityReadOnlyService;

	public ShareExpiryDateServiceImpl(FunctionalityReadOnlyService functionalityService) {
		this.functionalityReadOnlyService = functionalityService;
	}


	/**
     * Compute the expiration date of a document share
     * @param document : the document to be shared
     * @param owner : owner of the document
     * @return the expiration date
     */
	@Override
	public Calendar computeShareExpiryDate(DocumentEntry document, Account owner) {
		TimeUnitValueFunctionality shareExpirationTimeFunctionality = functionalityReadOnlyService.getDefaultShareExpiryTimeFunctionality(owner.getDomain());
		Calendar defaultExpiration = null;

		if(shareExpirationTimeFunctionality.getActivationPolicy().getStatus()) {

			List<ShareExpiryRule> shareRules = owner.getDomain().getShareExpiryRules();

			// set the default exp time
			if (shareExpirationTimeFunctionality.getValue() != null) {
				defaultExpiration = GregorianCalendar.getInstance();
				defaultExpiration.add(shareExpirationTimeFunctionality.toCalendarValue(), shareExpirationTimeFunctionality.getValue());
			}
			if ((shareRules == null) || (shareRules.size() == 0)) {
				return defaultExpiration;
			}

			// luckily, the shareExpiryRules are ordered according to the size,
			// increasing
			for (ShareExpiryRule shareExpiryRule : shareRules) {
				if (document.getSize() < shareExpiryRule.getShareSizeUnit().getPlainSize(shareExpiryRule.getShareSize())) {
					Calendar expiration = GregorianCalendar.getInstance();
					expiration.add(shareExpiryRule.getShareExpiryUnit().toCalendarValue(), shareExpiryRule.getShareExpiryTime());
					return expiration;
				}
			}
		}
		// nothing has been decided
		return defaultExpiration;
	}

	@Override
	public Date computeMinShareExpiryDateOfList(
			Set<DocumentEntry> documents, Account owner) {
		Calendar expiryCalendar = null;
		int docNumber = documents.size();

		if (docNumber == 0) {
			expiryCalendar = Calendar.getInstance();
		} else {
			for (DocumentEntry documentEntry : documents) {
				if (expiryCalendar == null) {
					expiryCalendar = computeShareExpiryDate(documentEntry, owner);
				} else {
					Calendar tempExpiryCalendar = computeShareExpiryDate(
							documentEntry, owner);
					if (tempExpiryCalendar.before(expiryCalendar)) {
						expiryCalendar = tempExpiryCalendar;
					}
				}
			}
		}
		return expiryCalendar.getTime();
	}
}