/*-
 * #%L
 * HAPI FHIR - Server Framework
 * %%
 * Copyright (C) 2014 - 2025 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.rest.api.server;

import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.context.api.AddProfileTagEnum;
import ca.uhn.fhir.interceptor.api.HookParams;
import ca.uhn.fhir.interceptor.api.IInterceptorBroadcaster;
import ca.uhn.fhir.interceptor.api.IInterceptorService;
import ca.uhn.fhir.interceptor.api.Pointcut;
import ca.uhn.fhir.interceptor.model.RequestPartitionId;
import ca.uhn.fhir.rest.api.EncodingEnum;
import ca.uhn.fhir.rest.server.ETagSupportEnum;
import ca.uhn.fhir.rest.server.ElementsSupportEnum;
import ca.uhn.fhir.rest.server.IPagingProvider;
import ca.uhn.fhir.rest.server.IRestfulServerDefaults;
import ca.uhn.fhir.rest.server.RestfulServer;
import ca.uhn.fhir.rest.server.interceptor.IServerInterceptor;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.MultimapBuilder;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.List;

import static java.util.Objects.nonNull;

/**
 * A default RequestDetails implementation that can be used for system calls to
 * Resource DAO methods when partitioning is enabled. Using a SystemRequestDetails
 * instance for system calls will ensure that any resource queries or updates will
 * use the DEFAULT partition when partitioning is enabled.
 */
public class SystemRequestDetails extends RequestDetails {
        private FhirContext myFhirContext;
        private ListMultimap<String, String> myHeaders;
        /**
         * If a SystemRequestDetails has a RequestPartitionId, it will take precedence over the tenantId
         */
        private RequestPartitionId myRequestPartitionId;

        private IRestfulServerDefaults myServer = new MyRestfulServerDefaults();

        public SystemRequestDetails() {
                this(new MyInterceptorBroadcaster());
        }

        public SystemRequestDetails(IInterceptorBroadcaster theInterceptorBroadcaster) {
                super(theInterceptorBroadcaster);
        }

        public SystemRequestDetails(RequestDetails theDetails) {
                super(theDetails);
                if (nonNull(theDetails.getServer())) {
                        myServer = theDetails.getServer();
                        myFhirContext = theDetails.getFhirContext();
                }
        }

        /**
         * Copy constructor
         * @param theOther The request details to copy from
         */
        public SystemRequestDetails(SystemRequestDetails theOther) {
                super(theOther);
                if (nonNull(theOther.getServer())) {
                        myServer = theOther.getServer();
                        myFhirContext = theOther.getFhirContext();
                }
                if (nonNull(theOther.myHeaders)) {
                        initHeaderMap();
                        myHeaders.putAll(theOther.myHeaders);
                }
                myRequestPartitionId = theOther.myRequestPartitionId;
        }

        // TODO KHS use this everywhere we create a srd with only one partition
        public static SystemRequestDetails forRequestPartitionId(RequestPartitionId thePartitionId) {
                SystemRequestDetails retVal = new SystemRequestDetails();
                retVal.setRequestPartitionId(thePartitionId);
                return retVal;
        }

        public RequestPartitionId getRequestPartitionId() {
                return myRequestPartitionId;
        }

        public SystemRequestDetails setRequestPartitionId(RequestPartitionId theRequestPartitionId) {
                myRequestPartitionId = theRequestPartitionId;
                return this;
        }

        @Override
        protected byte[] getByteStreamRequestContents() {
                return new byte[0];
        }

        @Override
        public Charset getCharset() {
                return null;
        }

        @Override
        public FhirContext getFhirContext() {
                return myFhirContext;
        }

        public void setFhirContext(FhirContext theFhirContext) {
                myFhirContext = theFhirContext;
        }

        @Override
        public String getHeader(String name) {
                List<String> headers = getHeaders(name);
                if (headers.isEmpty()) {
                        return null;
                } else {
                        return headers.get(0);
                }
        }

        @Override
        public List<String> getHeaders(String name) {
                ListMultimap<String, String> headers = myHeaders;
                if (headers == null) {
                        headers = ImmutableListMultimap.of();
                }
                return headers.get(name);
        }

        @Override
        public void addHeader(String theName, String theValue) {
                initHeaderMap();
                myHeaders.put(theName, theValue);
        }

        @Override
        public void setHeaders(String theName, List<String> theValues) {
                initHeaderMap();
                myHeaders.putAll(theName, theValues);
        }

        private void initHeaderMap() {
                if (myHeaders == null) {
                        // Make sure we are case-insensitive on keys
                        myHeaders = MultimapBuilder.treeKeys(String.CASE_INSENSITIVE_ORDER)
                                        .arrayListValues()
                                        .build();
                }
        }

        @Override
        public Object getAttribute(String theAttributeName) {
                return null;
        }

        @Override
        public void setAttribute(String theAttributeName, Object theAttributeValue) {}

        @Override
        public InputStream getInputStream() throws IOException {
                return null;
        }

        @Override
        public Reader getReader() {
                return null;
        }

        @Override
        public IRestfulServerDefaults getServer() {
                return myServer;
        }

        public void setServer(RestfulServer theServer) {
                this.myServer = theServer;
        }

        @Override
        public String getServerBaseForRequest() {
                return null;
        }

        private static class MyRestfulServerDefaults implements IRestfulServerDefaults {

                @Override
                public AddProfileTagEnum getAddProfileTag() {
                        return null;
                }

                @Override
                public EncodingEnum getDefaultResponseEncoding() {
                        return null;
                }

                @Override
                public ETagSupportEnum getETagSupport() {
                        return null;
                }

                @Override
                public ElementsSupportEnum getElementsSupport() {
                        return null;
                }

                @Override
                public FhirContext getFhirContext() {
                        return null;
                }

                @Override
                public List<IServerInterceptor> getInterceptors_() {
                        return null;
                }

                @Override
                public IPagingProvider getPagingProvider() {
                        return null;
                }

                @Override
                public boolean isDefaultPrettyPrint() {
                        return false;
                }

                @Override
                public IInterceptorService getInterceptorService() {
                        return null;
                }
        }

        private static class MyInterceptorBroadcaster implements IInterceptorBroadcaster {

                @Override
                public boolean callHooks(Pointcut thePointcut, HookParams theParams) {
                        return true;
                }

                @Override
                public Object callHooksAndReturnObject(Pointcut thePointcut, HookParams theParams) {
                        return null;
                }

                @Override
                public boolean hasHooks(Pointcut thePointcut) {
                        return false;
                }

                @Override
                public List<IInvoker> getInvokersForPointcut(Pointcut thePointcut) {
                        return Collections.emptyList();
                }
        }

        public static SystemRequestDetails forAllPartitions() {
                return new SystemRequestDetails().setRequestPartitionId(RequestPartitionId.allPartitions());
        }

        public static SystemRequestDetails newSystemRequestAllPartitions() {
                SystemRequestDetails systemRequestDetails = new SystemRequestDetails();
                systemRequestDetails.setRequestPartitionId(RequestPartitionId.allPartitions());
                return systemRequestDetails;
        }
}