package ca.uhn.fhir.rest.server;

import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.model.api.IResource;
import ca.uhn.fhir.model.api.ResourceMetadataKeyEnum;
import ca.uhn.fhir.model.dstu2.composite.IdentifierDt;
import ca.uhn.fhir.model.dstu2.resource.Patient;
import ca.uhn.fhir.model.primitive.IdDt;
import ca.uhn.fhir.model.primitive.InstantDt;
import ca.uhn.fhir.rest.annotation.IdParam;
import ca.uhn.fhir.rest.annotation.Read;
import ca.uhn.fhir.rest.annotation.ResourceParam;
import ca.uhn.fhir.rest.annotation.Update;
import ca.uhn.fhir.rest.api.Constants;
import ca.uhn.fhir.rest.api.EncodingEnum;
import ca.uhn.fhir.rest.api.MethodOutcome;
import ca.uhn.fhir.rest.server.exceptions.PreconditionFailedException;
import ca.uhn.fhir.test.utilities.JettyUtil;
import ca.uhn.fhir.util.TestUtil;
import org.apache.commons.io.IOUtils;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;

import java.io.IOException;
import java.util.Date;
import java.util.concurrent.TimeUnit;

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

public class ETagServerTest {

	private static CloseableHttpClient ourClient;
	private static PoolingHttpClientConnectionManager ourConnectionManager;
	private static FhirContext ourCtx;
	private static IdDt ourLastId;

	private static Date ourLastModifiedDate;
	private static int ourPort;

	private static Server ourServer;


	@BeforeEach
	public void before() throws IOException {
		ourLastId = null;
	}

	@Test
	public void testAutomaticNotModified() throws Exception {
		ourLastModifiedDate = new InstantDt("2012-11-25T02:34:45.2222Z").getValue();

		HttpGet httpGet = new HttpGet("http://localhost:" + ourPort + "/Patient/2");
		httpGet.addHeader(Constants.HEADER_IF_NONE_MATCH, "\"222\"");
		HttpResponse status = ourClient.execute(httpGet);
		try {
			assertEquals(Constants.STATUS_HTTP_304_NOT_MODIFIED, status.getStatusLine().getStatusCode());
		} finally {
			if (status.getEntity() != null) {
				IOUtils.closeQuietly(status.getEntity().getContent());
			}
		}

	}

	@Test
	public void testETagHeader() throws Exception {
		ourLastModifiedDate = new InstantDt("2012-11-25T02:34:45.2222Z").getValue();

		HttpGet httpGet = new HttpGet("http://localhost:" + ourPort + "/Patient/2/_history/3");
		HttpResponse status = ourClient.execute(httpGet);
		try {
			String responseContent = IOUtils.toString(status.getEntity().getContent());

			assertEquals(200, status.getStatusLine().getStatusCode());
			IdentifierDt dt = ourCtx.newXmlParser().parseResource(Patient.class, responseContent).getIdentifierFirstRep();
			assertEquals("2", dt.getSystemElement().getValueAsString());
			assertEquals("3", dt.getValue());

			Header cl = status.getFirstHeader(Constants.HEADER_ETAG_LC);
			assertNotNull(cl);
			assertEquals("W/\"222\"", cl.getValue());
		} finally {
			IOUtils.closeQuietly(status.getEntity().getContent());
		}
	}

	@Test
	public void testLastModifiedHeader() throws Exception {
		ourLastModifiedDate = new InstantDt("2012-11-25T02:34:45.222Z").getValue();

		HttpGet httpGet = new HttpGet("http://localhost:" + ourPort + "/Patient/2/_history/3");
		HttpResponse status = ourClient.execute(httpGet);
		try {
			String responseContent = IOUtils.toString(status.getEntity().getContent());

			assertEquals(200, status.getStatusLine().getStatusCode());
			IdentifierDt dt = ourCtx.newXmlParser().parseResource(Patient.class, responseContent).getIdentifierFirstRep();
			assertEquals("2", dt.getSystemElement().getValueAsString());
			assertEquals("3", dt.getValue());

			Header cl = status.getFirstHeader(Constants.HEADER_LAST_MODIFIED_LOWERCASE);
			assertNotNull(cl);
			assertEquals("Sun, 25 Nov 2012 02:34:45 GMT", cl.getValue());
		} finally {
			if (status.getEntity() != null) {
				IOUtils.closeQuietly(status.getEntity().getContent());
			}
		}
	}

	@Test
	public void testUpdateWithIfMatch() throws Exception {
		Patient p = new Patient();
		p.setId("2");
		p.addIdentifier().setSystem("urn:system").setValue("001");
		String resBody = ourCtx.newXmlParser().encodeResourceToString(p);

		HttpPut http;
		http = new HttpPut("http://localhost:" + ourPort + "/Patient/2");
		http.setEntity(new StringEntity(resBody, ContentType.create(Constants.CT_FHIR_XML, "UTF-8")));
		http.addHeader(Constants.HEADER_IF_MATCH, "\"221\"");
		CloseableHttpResponse status = ourClient.execute(http);
		try {
			assertEquals(200, status.getStatusLine().getStatusCode());
			assertEquals("Patient/2/_history/221", ourLastId.toUnqualified().getValue());
		} finally {
			if (status.getEntity() != null) {
				IOUtils.closeQuietly(status.getEntity().getContent());
			}
		}
	}

	@Test
	public void testUpdateWithIfMatchPreconditionFailed() throws Exception {
		Patient p = new Patient();
		p.setId("2");
		p.addIdentifier().setSystem("urn:system").setValue("001");
		String resBody = ourCtx.newXmlParser().encodeResourceToString(p);

		HttpPut http;
		http = new HttpPut("http://localhost:" + ourPort + "/Patient/2");
		http.setEntity(new StringEntity(resBody, ContentType.create(Constants.CT_FHIR_XML, "UTF-8")));
		http.addHeader(Constants.HEADER_IF_MATCH, "\"222\"");
		CloseableHttpResponse status = ourClient.execute(http);
		try {
			assertEquals(Constants.STATUS_HTTP_412_PRECONDITION_FAILED, status.getStatusLine().getStatusCode());
			assertEquals("Patient/2/_history/222", ourLastId.toUnqualified().getValue());
		} finally {
			if (status.getEntity() != null) {
				IOUtils.closeQuietly(status.getEntity().getContent());
			}
		}
	}

	@Test
	public void testUpdateWithNoVersion() throws Exception {
		Patient p = new Patient();
		p.setId("2");
		p.addIdentifier().setSystem("urn:system").setValue("001");
		String resBody = ourCtx.newXmlParser().encodeResourceToString(p);

		HttpPut http;
		http = new HttpPut("http://localhost:" + ourPort + "/Patient/2");
		http.setEntity(new StringEntity(resBody, ContentType.create(Constants.CT_FHIR_XML, "UTF-8")));
		HttpResponse status = ourClient.execute(http);
		try {
			assertEquals(200, status.getStatusLine().getStatusCode());
		} finally {
			if (status.getEntity() != null) {
				IOUtils.closeQuietly(status.getEntity().getContent());
			}
		}

	}

	@AfterAll
	public static void afterClassClearContext() throws Exception {
		JettyUtil.closeServer(ourServer);
		TestUtil.clearAllStaticFieldsForUnitTest();
	}

	@BeforeAll
	public static void beforeClass() throws Exception {
		ourServer = new Server(0);

		PatientProvider patientProvider = new PatientProvider();

		ServletHandler proxyHandler = new ServletHandler();
		RestfulServer servlet = new RestfulServer(FhirContext.forDstu2());
		ourCtx = servlet.getFhirContext();
		servlet.setResourceProviders(patientProvider);
		servlet.setDefaultResponseEncoding(EncodingEnum.XML);
		ServletHolder servletHolder = new ServletHolder(servlet);
		proxyHandler.addServletWithMapping(servletHolder, "/*");
		ourServer.setHandler(proxyHandler);
		JettyUtil.startServer(ourServer);
        ourPort = JettyUtil.getPortForStartedServer(ourServer);

		ourConnectionManager = new PoolingHttpClientConnectionManager(50000, TimeUnit.MILLISECONDS);
		HttpClientBuilder builder = HttpClientBuilder.create();
		builder.setConnectionManager(ourConnectionManager);
		ourClient = builder.build();

	}

	public static class PatientProvider implements IResourceProvider {

		@Read(version = true)
		public Patient findPatient(@IdParam IdDt theId) {
			Patient patient = new Patient();
			ResourceMetadataKeyEnum.UPDATED.put(patient, new InstantDt(ourLastModifiedDate));
			patient.addIdentifier().setSystem(theId.getIdPart()).setValue(theId.getVersionIdPart());
			patient.setId(theId.withVersion("222"));
			return patient;
		}

		@Override
		public Class<? extends IResource> getResourceType() {
			return Patient.class;
		}

		@Update
		public MethodOutcome updatePatient(@IdParam IdDt theId, @ResourceParam Patient theResource) {
			ourLastId = theId;

			if ("222".equals(theId.getVersionIdPart())) {
				throw new PreconditionFailedException("Bad version");
			}

			return new MethodOutcome(theId.withVersion(theId.getVersionIdPart() + "0"));
		}

	}

}
