package ca.uhn.fhir.rest.gclient;

import static org.apache.commons.lang3.StringUtils.isNotBlank;

/*
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2023 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%
 */

import java.util.Date;

import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.model.api.TemporalPrecisionEnum;
import ca.uhn.fhir.model.primitive.DateTimeDt;
import ca.uhn.fhir.rest.param.ParamPrefixEnum;

/**
 * Date parameter type for use in fluent client interfaces
 */
public class DateClientParam  extends BaseClientParam implements IParam {

        private String myParamName;

        @Override
        public String getParamName() {
                return myParamName;
        }

        public DateClientParam(String theParamName) {
                myParamName = theParamName;
        }

        public IDateSpecifier after() {
                return new DateWithPrefix(ParamPrefixEnum.GREATERTHAN);
        }

        public IDateSpecifier afterOrEquals() {
                return new DateWithPrefix(ParamPrefixEnum.GREATERTHAN_OR_EQUALS);
        }

        public IDateSpecifier before() {
                return new DateWithPrefix(ParamPrefixEnum.LESSTHAN);
        }

        public IDateSpecifier beforeOrEquals() {
                return new DateWithPrefix(ParamPrefixEnum.LESSTHAN_OR_EQUALS);
        }

        public IDateSpecifier exactly() {
                return new DateWithPrefix(ParamPrefixEnum.EQUAL);
        }

        private class Criterion implements IDateCriterion, ICriterionInternal {

                private String myValue;
                private ParamPrefixEnum myPrefix;
                private Criterion orCriterion;

                public Criterion(ParamPrefixEnum thePrefix, String theValue) {
                        myPrefix = thePrefix;
                        myValue = theValue;
                }

                @Override
                public String getParameterName() {
                        return myParamName;
                }

                @Override
                public String getParameterValue(FhirContext theContext) {
                        StringBuilder b = new StringBuilder();
                        if (orCriterion != null) {
                                String orValue = orCriterion.getParameterValue(theContext);
                                if (isNotBlank(orValue)) {
                                        b.append(orValue);
                                }
                        }
                        if (isNotBlank(myValue)) {
                                if (b.length() > 0) {
                                        b.append(',');
                                }
                                if (myPrefix != null && myPrefix != ParamPrefixEnum.EQUAL) {
                                        b.append(myPrefix.getValue());
                                }
                                b.append(myValue);
                        }
                        return b.toString();
                }

                @Override
                public IDateSpecifier orAfter() {
                        return new DateWithPrefix(ParamPrefixEnum.GREATERTHAN, this);
                }

                @Override
                public IDateSpecifier orAfterOrEquals() {
                        return new DateWithPrefix(ParamPrefixEnum.GREATERTHAN_OR_EQUALS, this);
                }

                @Override
                public IDateSpecifier orBefore() {
                        return new DateWithPrefix(ParamPrefixEnum.LESSTHAN, this);
                }

                @Override
                public IDateSpecifier orBeforeOrEquals() {
                        return new DateWithPrefix(ParamPrefixEnum.LESSTHAN_OR_EQUALS, this);
                }

                @Override
                public IDateSpecifier orExactly() {
                        return new DateWithPrefix(ParamPrefixEnum.EQUAL, this);
                }

        }

        private class DateWithPrefix implements IDateSpecifier {
                private ParamPrefixEnum myPrefix;
                private Criterion previous = null;

                public DateWithPrefix(ParamPrefixEnum thePrefix, Criterion previous) {
                        myPrefix = thePrefix;
                        this.previous = previous;
                }

                public DateWithPrefix(ParamPrefixEnum thePrefix) {
                        myPrefix = thePrefix;
                }

                @Override
                public IDateCriterion day(Date theValue) {
                        DateTimeDt dt = new DateTimeDt(theValue);
                        dt.setPrecision(TemporalPrecisionEnum.DAY);
                        return constructCriterion(dt);
                }

                @Override
                public IDateCriterion day(String theValue) {
                        DateTimeDt dt = new DateTimeDt(theValue);
                        dt.setPrecision(TemporalPrecisionEnum.DAY);
                        return constructCriterion(dt);
                }

                @Override
                public IDateCriterion now() {
                        DateTimeDt dt = DateTimeDt.withCurrentTime();
                        dt.setPrecision(TemporalPrecisionEnum.SECOND);
                        return constructCriterion(dt);
                }

                @Override
                public IDateCriterion second(Date theValue) {
                        DateTimeDt dt = new DateTimeDt(theValue);
                        dt.setPrecision(TemporalPrecisionEnum.SECOND);
                        return constructCriterion(dt);
                }

                @Override
                public IDateCriterion second(String theValue) {
                        DateTimeDt dt = new DateTimeDt(theValue);
                        dt.setPrecision(TemporalPrecisionEnum.SECOND);
                        return constructCriterion(dt);
                }

                @Override
                public IDateCriterion millis(Date theValue) {
                        DateTimeDt dt = new DateTimeDt(theValue);
                        dt.setPrecision(TemporalPrecisionEnum.MILLI);
                        return constructCriterion(dt);
                }

                @Override
                public IDateCriterion millis(String theValue) {
                        DateTimeDt dt = new DateTimeDt(theValue);
                        dt.setPrecision(TemporalPrecisionEnum.MILLI);
                        return constructCriterion(dt);
                }

                private IDateCriterion constructCriterion(DateTimeDt dt) {
                        String valueAsString = dt.getValueAsString();
                        Criterion criterion = new Criterion(myPrefix, valueAsString);
                        if (previous != null) {
                                criterion.orCriterion = previous;
                        }
                        return criterion;
                }
        }

        public interface IDateSpecifier {

                IDateCriterion day(Date theValue);

                IDateCriterion day(String theValue);

                IDateCriterion now();

                IDateCriterion second(Date theValue);

                IDateCriterion second(String theValue);

                IDateCriterion millis(Date theValue);

                IDateCriterion millis(String theValue);

        }

        public interface IDateCriterion extends ICriterion<DateClientParam> {
                IDateSpecifier orAfter();

                IDateSpecifier orAfterOrEquals();

                IDateSpecifier orBefore();

                IDateSpecifier orBeforeOrEquals();

                IDateSpecifier orExactly();
        }

}