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/*-
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2024 Smile CDR, Inc.
 * %%
 * 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.
 * #L%
 */
package ca.uhn.fhir.util;

import ca.uhn.fhir.rest.param.DateRangeParam;
import jakarta.annotation.Nonnull;
import jakarta.annotation.Nullable;

import java.util.Date;

public class DateRangeUtil {

	/**
	 * Narrow the DateRange to be within theStartInclusive, and theEndExclusive, if provided.
	 *
	 * @param theDateRangeParam the initial range, null for unconstrained
	 * @param theStartInclusive a lower bound to apply, or null for unchanged.
	 * @param theEndExclusive   an upper bound to apply, or null for unchanged.
	 * @return a DateRange within the original range, and between theStartInclusive and theEnd
	 */
	@Nonnull
	public static DateRangeParam narrowDateRange(
			@Nullable DateRangeParam theDateRangeParam,
			@Nullable Date theStartInclusive,
			@Nullable Date theEndExclusive) {
		if (theStartInclusive == null && theEndExclusive == null) {
			return theDateRangeParam;
		}
		DateRangeParam result =
				theDateRangeParam == null ? new DateRangeParam() : new DateRangeParam(theDateRangeParam);

		Date startInclusive = theStartInclusive;
		if (startInclusive != null) {
			Date inputStart = result.getLowerBoundAsInstant();

			Date upperBound = result.getUpperBoundAsInstant();
			if (upperBound != null && upperBound.before(startInclusive)) {
				startInclusive = upperBound;
			}

			if (theDateRangeParam == null || inputStart == null || inputStart.before(startInclusive)) {
				result.setLowerBoundInclusive(startInclusive);
			}
		}
		if (theEndExclusive != null) {
			Date inputEnd = result.getUpperBound() == null
					? null
					: result.getUpperBound().getValue();
			if (theDateRangeParam == null || inputEnd == null || inputEnd.after(theEndExclusive)) {
				result.setUpperBoundExclusive(theEndExclusive);
			}
		}

		return result;
	}
}