/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.camel.component.fhir;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import ca.uhn.fhir.rest.api.EncodingEnum;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.fhir.api.ExtraParameters;
import org.apache.camel.component.fhir.internal.FhirApiCollection;
import org.apache.camel.component.fhir.internal.FhirLoadPageApiMethod;
import org.hl7.fhir.instance.model.api.IBaseBundle;
import org.hl7.fhir.instance.model.api.IBaseResource;
import org.hl7.fhir.r4.model.Bundle;
import org.hl7.fhir.r4.model.HumanName;
import org.hl7.fhir.r4.model.Patient;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

/**
 * Test class for {@link org.apache.camel.component.fhir.api.FhirLoadPage} APIs. The class source won't be generated
 * again if the generator MOJO finds it under src/test/java.
 */
public class FhirLoadPageIT extends AbstractFhirTestSupport {

    private static final Logger LOG = LoggerFactory.getLogger(FhirLoadPageIT.class);
    private static final String PATH_PREFIX
            = FhirApiCollection.getCollection().getApiName(FhirLoadPageApiMethod.class).getName();

    @Test
    public void testByUrl() {
        String url = "Patient?_count=2";
        Bundle bundle = this.fhirClient.search()
                .byUrl(url)
                .returnBundle(Bundle.class).execute();
        assertNotNull(bundle.getLink(IBaseBundle.LINK_NEXT));

        String nextPageLink = bundle.getLink("next").getUrl();

        final Map<String, Object> headers = new HashMap<>();
        // parameter type is String
        headers.put("CamelFhir.url", nextPageLink);
        // parameter type is Class
        headers.put("CamelFhir.returnType", Bundle.class);

        IBaseBundle result = requestBodyAndHeaders("direct://BY_URL", null, headers);

        LOG.debug("byUrl: {}", result);
        assertNotNull(result, "byUrl result");
    }

    @Test
    public void testNext() {
        String url = "Patient?_count=2";
        Bundle bundle = this.fhirClient.search()
                .byUrl(url)
                .returnBundle(Bundle.class).execute();
        assertNotNull(bundle.getLink(IBaseBundle.LINK_NEXT));

        // using org.hl7.fhir.instance.model.api.IBaseBundle message body for single parameter "bundle"
        Bundle result = requestBody("direct://NEXT", bundle);

        assertNotNull(result, "next result");
        LOG.debug("next: {}", result);
    }

    @Test
    public void testPrevious() {
        String url = "Patient?_count=2";
        Bundle bundle = this.fhirClient.search()
                .byUrl(url)
                .returnBundle(Bundle.class).execute();
        assertNotNull(bundle.getLink(IBaseBundle.LINK_NEXT));

        String nextPageLink = bundle.getLink("next").getUrl();
        bundle = this.fhirClient.loadPage().byUrl(nextPageLink).andReturnBundle(Bundle.class).execute();
        assertNotNull(bundle.getLink(IBaseBundle.LINK_PREV));

        // using org.hl7.fhir.instance.model.api.IBaseBundle message body for single parameter "bundle"
        Bundle result = requestBody("direct://PREVIOUS", bundle);

        LOG.debug("previous: {}", result);
        assertNotNull(result, "previous result");
    }

    @Test
    public void testPreviousWithEncodingEnum() {
        String url = "Patient?_count=2";
        Bundle bundle = this.fhirClient.search()
                .byUrl(url)
                .returnBundle(Bundle.class).execute();
        assertNotNull(bundle.getLink(IBaseBundle.LINK_NEXT));

        String nextPageLink = bundle.getLink("next").getUrl();
        bundle = this.fhirClient.loadPage().byUrl(nextPageLink).andReturnBundle(Bundle.class).execute();
        assertNotNull(bundle.getLink(IBaseBundle.LINK_PREV));
        Map<String, Object> headers = new HashMap<>();
        headers.put(ExtraParameters.ENCODING_ENUM.getHeaderName(), EncodingEnum.XML);

        // using org.hl7.fhir.instance.model.api.IBaseBundle message body for single parameter "bundle"
        Bundle result = requestBodyAndHeaders("direct://PREVIOUS", bundle, headers);

        LOG.debug("previous: {}", result);
        assertNotNull(result, "previous result");
    }

    @BeforeEach
    public void populateServer() {
        List<IBaseResource> input = new ArrayList<>();

        Patient p1 = new Patient();
        p1.addName().setFamily("PATIENT1");
        input.add(p1);

        Patient p2 = new Patient();
        p2.addName().setFamily("PATIENT2");
        input.add(p2);

        input.add(new Patient().addName(new HumanName().setFamily("PATIENT3")));

        List<IBaseResource> response = fhirClient.transaction()
                .withResources(input)
                .encodedJson()
                .execute();
        assertEquals(3, response.size());
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            public void configure() {
                // test route for byUrl
                from("direct://BY_URL")
                        .to("fhir://" + PATH_PREFIX + "/byUrl");

                // test route for next
                from("direct://NEXT")
                        .to("fhir://" + PATH_PREFIX + "/next?inBody=bundle");

                // test route for previous
                from("direct://PREVIOUS")
                        .to("fhir://" + PATH_PREFIX + "/previous?inBody=bundle");

            }
        };
    }
}
