Hack23/cia

/*
 * Copyright 2010-2021 James Pether Sörling
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *    $Id$
 *  $HeadURL$
*/
package com.hack23.cia.service.external.riksdagen.impl;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;

import com.hack23.cia.model.external.riksdagen.votering.impl.BallotContainer;
import com.hack23.cia.model.external.riksdagen.votering.impl.VoteDataDto;

/**
 * The Class RiksdagenDateUtil.
 */
final class RiksdagenDateUtil {

    /** The Constant YYYY_MM_DD. */
    public static final String YYYY_MM_DD = "yyyy-MM-dd";

    /** The Constant CONTAINS_ONE. */
    private static final int CONTAINS_ONE = 1;


    /**
     * Instantiates a new riksdagen date util.
     */
    public RiksdagenDateUtil() {
        super();
    }

    /**
     * Best guess vote date.
     *
     * @param ballotContainer
     *            the ballot container
     * @return the date
     * @throws ParseException
     *             the parse exception
     */
    private static Date bestGuessVoteDate(final BallotContainer ballotContainer) throws ParseException {
        final com.hack23.cia.model.external.riksdagen.votering.impl.BallotDocumentElement ballotDocumentElement = ballotContainer.getBallotDocumentElement();
        Date result;

        final String createdDate=ballotContainer.getBallotDocumentElement().getCreatedDate();

        if(createdDate!= null && createdDate.length()>= YYYY_MM_DD.length()) {
            result=new SimpleDateFormat(YYYY_MM_DD,Locale.ENGLISH).parse(createdDate);
        } else {
            final String systemDate = ballotDocumentElement.getSystemDate();

            if(systemDate!= null && systemDate.length()>= YYYY_MM_DD.length()) {
                result=new SimpleDateFormat(YYYY_MM_DD,Locale.ENGLISH).parse(systemDate);
            } else {
                result=new SimpleDateFormat(YYYY_MM_DD,Locale.ENGLISH).parse(ballotDocumentElement.getMadePublicDate());
            }
        }
        return result;
    }

    /**
     * Check same date.
     *
     * @param voteList
     *            the vote list
     * @return the date
     * @throws ParseException
     *             the parse exception
     */
    private static Date checkSameDate(final List<VoteDataDto> voteList) throws ParseException {
        final Set<String> set = new HashSet<>();
        Date result=null;

        for (final VoteDataDto voteData : voteList) {
            final String voteDate = voteData.getVoteDate();
            if (voteDate !=null && voteDate.length() >= YYYY_MM_DD.length()) {
                set.add(voteData.getVoteDate());
            }
        }

        if (set.size() ==CONTAINS_ONE) {
            final String dateString = set.iterator().next();
            result=new SimpleDateFormat(YYYY_MM_DD,Locale.ENGLISH).parse(dateString);
        }
        return result;
    }

    /**
     * Try to find valid vote date.
     *
     * @param ballotContainer
     *            the ballot container
     * @param voteDataList
     *            the vote data list
     * @return the date
     * @throws ParseException
     *             the parse exception
     */
    public static Date tryToFindValidVoteDate(final BallotContainer ballotContainer, final List<VoteDataDto> voteDataList)
                    throws ParseException {
        Date ballotDate;
        final Date sameDate = checkSameDate(voteDataList);

        if (sameDate != null) {
            ballotDate = sameDate;
        } else {
            ballotDate = bestGuessVoteDate(ballotContainer);
        }
        return ballotDate;
    }

}