/*
 * Copyright 2010-2013 Ning, Inc.
 *
 * Ning licenses this file to you 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.
 */

package org.killbill.billing.entitlement.api;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.Interval;
import org.joda.time.LocalDate;

import org.killbill.billing.account.api.Account;
import org.killbill.billing.account.api.AccountApiException;
import org.killbill.billing.account.api.AccountInternalApi;
import org.killbill.billing.callcontext.InternalTenantContext;
import org.killbill.clock.Clock;
import org.killbill.clock.ClockUtil;

public class EntitlementDateHelper {

    private final AccountInternalApi accountApi;
    private final Clock clock;

    public EntitlementDateHelper(final AccountInternalApi accountApi, final Clock clock) {
        this.accountApi = accountApi;
        this.clock = clock;
    }

    public DateTime fromLocalDateAndReferenceTime(final LocalDate requestedDate, final DateTime referenceDateTime, final InternalTenantContext callContext) throws EntitlementApiException {
        try {
            final Account account = accountApi.getAccountByRecordId(callContext.getAccountRecordId(), callContext);
            return ClockUtil.computeDateTimeWithUTCReferenceTime(requestedDate, referenceDateTime.toDateTime(DateTimeZone.UTC).toLocalTime(), account.getTimeZone(), clock);
        } catch (AccountApiException e) {
            throw new EntitlementApiException(e);
        }
    }

    /**
     * Check if the date portion of a date/time is before or equals at now (as returned by the clock).
     *
     * @param inputDate       the fully qualified DateTime
     * @param accountTimeZone the account timezone
     * @return true if the inputDate, once converted into a LocalDate using account timezone is less or equals than today
     */
    // TODO Move to ClockUtils
    public boolean isBeforeOrEqualsToday(final DateTime inputDate, final DateTimeZone accountTimeZone) {
        final LocalDate localDateNowInAccountTimezone = new LocalDate(clock.getUTCNow(), accountTimeZone);
        final LocalDate targetDateInAccountTimezone = new LocalDate(inputDate, accountTimeZone);
        return targetDateInAccountTimezone.compareTo(localDateNowInAccountTimezone) <= 0;
    }
}
