package org.hl7.fhir.r5.hapi.ctx;

import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.context.support.ConceptValidationOptions;
import ca.uhn.fhir.context.support.IValidationSupport;
import ca.uhn.fhir.context.support.ValidationSupportContext;
import ca.uhn.fhir.i18n.Msg;
import ca.uhn.fhir.rest.api.Constants;
import ca.uhn.fhir.sl.cache.Cache;
import ca.uhn.fhir.sl.cache.CacheFactory;
import ca.uhn.fhir.system.HapiSystemProperties;
import org.apache.commons.lang3.Validate;
import org.fhir.ucum.UcumService;
import org.hl7.fhir.exceptions.FHIRException;
import org.hl7.fhir.exceptions.TerminologyServiceException;
import org.hl7.fhir.r5.context.IContextResourceLoader;
import org.hl7.fhir.r5.context.IWorkerContext;
import org.hl7.fhir.r5.context.IWorkerContextManager;
import org.hl7.fhir.r5.model.CodeSystem;
import org.hl7.fhir.r5.model.CodeSystem.ConceptDefinitionComponent;
import org.hl7.fhir.r5.model.CodeableConcept;
import org.hl7.fhir.r5.model.Coding;
import org.hl7.fhir.r5.model.ElementDefinition.ElementDefinitionBindingComponent;
import org.hl7.fhir.r5.model.NamingSystem;
import org.hl7.fhir.r5.model.OperationOutcome;
import org.hl7.fhir.r5.model.PackageInformation;
import org.hl7.fhir.r5.model.Parameters;
import org.hl7.fhir.r5.model.Resource;
import org.hl7.fhir.r5.model.ResourceType;
import org.hl7.fhir.r5.model.StructureDefinition;
import org.hl7.fhir.r5.model.ValueSet;
import org.hl7.fhir.r5.model.ValueSet.ConceptSetComponent;
import org.hl7.fhir.r5.profilemodel.PEBuilder;
import org.hl7.fhir.r5.terminologies.expansion.ValueSetExpansionOutcome;
import org.hl7.fhir.r5.terminologies.utilities.CodingValidationRequest;
import org.hl7.fhir.r5.terminologies.utilities.ValidationResult;
import org.hl7.fhir.r5.utils.validation.IResourceValidator;
import org.hl7.fhir.r5.utils.validation.ValidationContextCarrier;
import org.hl7.fhir.utilities.FhirPublication;
import org.hl7.fhir.utilities.TimeTracker;
import org.hl7.fhir.utilities.i18n.I18nBase;
import org.hl7.fhir.utilities.npm.BasePackageCacheManager;
import org.hl7.fhir.utilities.npm.NpmPackage;
import org.hl7.fhir.utilities.validation.ValidationMessage.IssueSeverity;
import org.hl7.fhir.utilities.validation.ValidationOptions;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

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

public final class HapiWorkerContext extends I18nBase implements IWorkerContext {
        private final FhirContext myCtx;
        private final Cache<String, Resource> myFetchedResourceCache;
        private final IValidationSupport myValidationSupport;
        private Parameters myExpansionProfile;
        private String myOverrideVersionNs;

        public HapiWorkerContext(FhirContext theCtx, IValidationSupport theValidationSupport) {
                Validate.notNull(theCtx, "theCtx must not be null");
                Validate.notNull(theValidationSupport, "theValidationSupport must not be null");
                myCtx = theCtx;
                myValidationSupport = theValidationSupport;

                long timeoutMillis = HapiSystemProperties.getValidationResourceCacheTimeoutMillis();

                myFetchedResourceCache = CacheFactory.build(timeoutMillis);

                // Set a default locale
                setValidationMessageLanguage(getLocale());
        }

        @Override
        public CodeSystem fetchCodeSystem(String theSystem) {
                if (myValidationSupport == null) {
                        return null;
                } else {
                        return (CodeSystem) myValidationSupport.fetchCodeSystem(theSystem);
                }
        }

        @Override
        public CodeSystem fetchCodeSystem(String theSystem, String version) {
                if (myValidationSupport == null) {
                        return null;
                } else {
                        return (CodeSystem) myValidationSupport.fetchCodeSystem(theSystem);
                }
        }

        @Override
        public CodeSystem fetchCodeSystem(String system, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2456));
        }

        @Override
        public CodeSystem fetchCodeSystem(String system, String version, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2457));
        }

        @Override
        public CodeSystem fetchSupplementedCodeSystem(String theS) {
                return null;
        }

        @Override
        public CodeSystem fetchSupplementedCodeSystem(String theS, String theS1) {
                return null;
        }

        @Override
        public CodeSystem fetchSupplementedCodeSystem(String system, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2458));
        }

        @Override
        public CodeSystem fetchSupplementedCodeSystem(String system, String version, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2459));
        }

        @Override
        public List<String> getResourceNames() {
                List<String> result = new ArrayList<>();
                for (ResourceType next : ResourceType.values()) {
                        result.add(next.name());
                }
                Collections.sort(result);
                return result;
        }

        @Override
        public List<String> getResourceNames(FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2460));
        }

        @Override
        public IResourceValidator newValidator() {
                throw new UnsupportedOperationException(Msg.code(206));
        }

        @Override
        public Map<String, NamingSystem> getNSUrlMap() {
                throw new UnsupportedOperationException(Msg.code(2241));
        }

        @Override
        public boolean supportsSystem(String theSystem) {
                if (myValidationSupport == null) {
                        return false;
                } else {
                        return myValidationSupport.isCodeSystemSupported(
                                        new ValidationSupportContext(myValidationSupport), theSystem);
                }
        }

        @Override
        public boolean supportsSystem(String system, FhirPublication fhirVersion) throws TerminologyServiceException {
                if (!fhirVersion.equals(FhirPublication.R5)) {
                        throw new UnsupportedOperationException(Msg.code(2461));
                }
                return supportsSystem(system);
        }

        @Override
        public SystemSupportInformation getTxSupportInfo(String system, String version) {
                return null;
        }

        @Override
        public SystemSupportInformation getTxSupportInfo(String system) {
                return null;
        }

        @Override
        public ValidationResult validateCode(ValidationOptions theOptions, CodeableConcept theCode, ValueSet theVs) {
                for (Coding next : theCode.getCoding()) {
                        ValidationResult retVal = validateCode(theOptions, next, theVs);
                        if (retVal.isOk()) {
                                return retVal;
                        }
                }

                return new ValidationResult(IssueSeverity.ERROR, null, null);
        }

        @Override
        public ValidationResult validateCode(ValidationOptions theOptions, Coding theCode, ValueSet theVs) {
                String system = theCode.getSystem();
                String code = theCode.getCode();
                String display = theCode.getDisplay();
                return validateCode(theOptions, system, null, code, display, theVs);
        }

        @Override
        public ValidationResult validateCode(
                        ValidationOptions options, Coding code, ValueSet vs, ValidationContextCarrier ctxt) {
                return validateCode(options, code, vs);
        }

        @Override
        public void validateCodeBatch(
                        ValidationOptions options, List<? extends CodingValidationRequest> codes, ValueSet vs, boolean passVS) {}

        @Override
        public ValueSetExpansionOutcome expandVS(
                        ValueSet theValueSet, boolean cacheOk, boolean heiarchical, boolean incompleteOk) {
                return null;
        }

        @Override
        public ValueSetExpansionOutcome expandVS(String s, boolean b, boolean b1, int i) {
                return null;
        }

        @Override
        public ValidationResult validateCode(
                        ValidationOptions theOptions, String theSystem, String theVersion, String theCode, String theDisplay) {
                IValidationSupport.CodeValidationResult result = myValidationSupport.validateCode(
                                new ValidationSupportContext(myValidationSupport),
                                convertConceptValidationOptions(theOptions),
                                theSystem,
                                theCode,
                                theDisplay,
                                null);
                if (result == null) {
                        return null;
                }
                IssueSeverity severity = null;
                if (result.getSeverity() != null) {
                        severity = IssueSeverity.fromCode(result.getSeverityCode());
                }
                ConceptDefinitionComponent definition = new ConceptDefinitionComponent().setCode(result.getCode());
                return new ValidationResult(severity, result.getMessage(), theSystem, theVersion, definition, null, null);
        }

        @Override
        public ValidationResult validateCode(
                        ValidationOptions theOptions,
                        String theSystem,
                        String theVersion,
                        String theCode,
                        String theDisplay,
                        ValueSet theVs) {
                IValidationSupport.CodeValidationResult outcome;
                if (isNotBlank(theVs.getUrl())) {
                        outcome = myValidationSupport.validateCode(
                                        new ValidationSupportContext(myValidationSupport),
                                        convertConceptValidationOptions(theOptions),
                                        theSystem,
                                        theCode,
                                        theDisplay,
                                        theVs.getUrl());
                } else {
                        outcome = myValidationSupport.validateCodeInValueSet(
                                        new ValidationSupportContext(myValidationSupport),
                                        convertConceptValidationOptions(theOptions),
                                        theSystem,
                                        theCode,
                                        theDisplay,
                                        theVs);
                }

                if (outcome != null && outcome.isOk()) {
                        ConceptDefinitionComponent definition = new ConceptDefinitionComponent();
                        definition.setCode(theCode);
                        definition.setDisplay(outcome.getDisplay());
                        return new ValidationResult(theSystem, theVersion, definition, null);
                }

                return new ValidationResult(
                                IssueSeverity.ERROR,
                                "Unknown code[" + theCode + "] in system[" + Constants.codeSystemWithDefaultDescription(theSystem)
                                                + "]",
                                null);
        }

        @Override
        public ValidationResult validateCode(ValidationOptions theOptions, String code, ValueSet vs) {
                return validateCode(theOptions, null, null, code, null, vs);
        }

        @Override
        public Parameters getExpansionParameters() {
                return myExpansionProfile;
        }

        @Override
        public void setExpansionParameters(Parameters expParameters) {
                setExpansionProfile(expParameters);
        }

        public void setExpansionProfile(Parameters theExpParameters) {
                myExpansionProfile = theExpParameters;
        }

        @Override
        public ValueSetExpansionOutcome expandVS(ValueSet theSource, boolean theCacheOk, boolean theHierarchical) {
                throw new UnsupportedOperationException(Msg.code(2128));
        }

        @Override
        public ValueSetExpansionOutcome expandVS(ValueSet theSource, boolean theCacheOk, boolean theHierarchical, int i) {
                throw new UnsupportedOperationException(Msg.code(2650));
        }

        /*1@Override
        public ValueSetExpansionOutcome expandVS(ConceptSetComponent theInc, boolean theHierarchical, boolean theNoInactive)
                        throws TerminologyServiceException {
                ValueSet input = new ValueSet();
                input.getCompose().setInactive(!theNoInactive); // TODO GGG/DO is this valid?
                input.getCompose().addInclude(theInc);
                IValidationSupport.ValueSetExpansionOutcome output =
                                myValidationSupport.expandValueSet(new ValidationSupportContext(myValidationSupport), null, input);
                return new ValueSetExpansionOutcome(
                                (ValueSet) output.getValueSet(), output.getError(), null, output.getErrorIsFromServer());
        }*/

        @Override
        public Locale getLocale() {
                return Locale.getDefault();
        }

        @Override
        public void setLocale(Locale locale) {
                // ignore
        }

        @Override
        public org.hl7.fhir.r5.context.ILoggingService getLogger() {
                throw new UnsupportedOperationException(Msg.code(213));
        }

        @Override
        public void setLogger(org.hl7.fhir.r5.context.ILoggingService theLogger) {
                throw new UnsupportedOperationException(Msg.code(214));
        }

        @Override
        public String getVersion() {
                return myCtx.getVersion().getVersion().getFhirVersionString();
        }

        @Override
        public UcumService getUcumService() {
                throw new UnsupportedOperationException(Msg.code(216));
        }

        @Override
        public void setUcumService(UcumService ucumService) {
                throw new UnsupportedOperationException(Msg.code(217));
        }

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

        @Override
        public Set<String> getCodeSystemsUsed() {
                throw new UnsupportedOperationException(Msg.code(218));
        }

        @Override
        public StructureDefinition fetchTypeDefinition(String typeName) {
                return fetchResource(StructureDefinition.class, "http://hl7.org/fhir/StructureDefinition/" + typeName);
        }

        @Override
        public boolean isPrimitiveType(String s) {
                throw new UnsupportedOperationException(Msg.code(2462));
        }

        @Override
        public boolean isDataType(String s) {
                throw new UnsupportedOperationException(Msg.code(2463));
        }

        @Override
        public StructureDefinition fetchTypeDefinition(String typeName, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2464));
        }

        @Override
        public List<StructureDefinition> fetchTypeDefinitions(String n) {
                throw new UnsupportedOperationException(Msg.code(234));
        }

        @Override
        public List<StructureDefinition> fetchTypeDefinitions(String n, FhirPublication fhirPublication) {
                throw new UnsupportedOperationException(Msg.code(2465));
        }

        @Override
        public <T extends Resource> T fetchResourceRaw(Class<T> class_, String uri) {
                return fetchResource(class_, uri);
        }

        @Override
        public <T extends org.hl7.fhir.r5.model.Resource> T fetchResource(Class<T> theClass, String theUri) {
                if (myValidationSupport == null || theUri == null) {
                        return null;
                } else {
                        @SuppressWarnings("unchecked")
                        T retVal = (T) myFetchedResourceCache.get(theUri, t -> myValidationSupport.fetchResource(theClass, theUri));
                        return retVal;
                }
        }

        public <T extends Resource> T fetchResource(Class<T> class_, String uri, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2466));
        }

        @Override
        public <T extends org.hl7.fhir.r5.model.Resource> T fetchResourceWithException(Class<T> theClass, String theUri)
                        throws FHIRException {
                T retVal = fetchResource(theClass, theUri);
                if (retVal == null) {
                        throw new FHIRException(Msg.code(224) + "Could not find resource: " + theUri);
                }
                return retVal;
        }

        @Override
        public <T extends Resource> T fetchResourceWithException(Class<T> theClass, String uri, Resource sourceOfReference)
                        throws FHIRException {
                throw new UnsupportedOperationException(Msg.code(2213));
        }

        @Override
        public <T extends Resource> T fetchResource(Class<T> theClass, String theUri, String theVersion) {
                return fetchResource(theClass, theUri + "|" + theVersion);
        }

        @Override
        public <T extends Resource> T fetchResource(
                        Class<T> class_, String uri, String version, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2467));
        }

        @Override
        public <T extends Resource> T fetchResource(Class<T> class_, String uri, Resource canonicalForSource) {
                return fetchResource(class_, uri);
        }

        @Override
        public <T extends Resource> List<T> fetchResourcesByType(Class<T> class_, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2468));
        }

        @Override
        public org.hl7.fhir.r5.model.Resource fetchResourceById(String theType, String theUri) {
                throw new UnsupportedOperationException(Msg.code(226));
        }

        @Override
        public Resource fetchResourceById(String type, String uri, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2469));
        }

        @Override
        public <T extends org.hl7.fhir.r5.model.Resource> boolean hasResource(Class<T> theClass_, String theUri) {
                throw new UnsupportedOperationException(Msg.code(227));
        }

        @Override
        public <T extends Resource> boolean hasResource(Class<T> class_, String uri, Resource sourceOfReference) {
                throw new UnsupportedOperationException(Msg.code(2470));
        }

        @Override
        public <T extends Resource> boolean hasResource(Class<T> class_, String uri, FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2471));
        }

        @Override
        public void cacheResource(org.hl7.fhir.r5.model.Resource theRes) throws FHIRException {
                throw new UnsupportedOperationException(Msg.code(228));
        }

        @Override
        public void cacheResourceFromPackage(Resource res, PackageInformation packageDetails) throws FHIRException {
                throw new UnsupportedOperationException(Msg.code(229));
        }

        @Override
        public void cachePackage(PackageInformation packageInformation) {}

        @Override
        public Set<String> getResourceNamesAsSet() {
                return myCtx.getResourceTypes();
        }

        @Override
        public Set<String> getResourceNamesAsSet(FhirPublication fhirVersion) {
                throw new UnsupportedOperationException(Msg.code(2472));
        }

        @Override
        public ValueSetExpansionOutcome expandVS(
                        Resource src, ElementDefinitionBindingComponent theBinding, boolean theCacheOk, boolean theHierarchical)
                        throws FHIRException {
                throw new UnsupportedOperationException(Msg.code(230));
        }

        @Override
        public ValueSetExpansionOutcome expandVS(
                        ITerminologyOperationDetails iTerminologyOperationDetails,
                        ConceptSetComponent conceptSetComponent,
                        boolean b,
                        boolean b1)
                        throws TerminologyServiceException {
                return null;
        }

        @Override
        public Set<String> getBinaryKeysAsSet() {
                throw new UnsupportedOperationException(Msg.code(2115));
        }

        @Override
        public boolean hasBinaryKey(String s) {
                throw new UnsupportedOperationException(Msg.code(2129));
        }

        @Override
        public byte[] getBinaryForKey(String s) {
                throw new UnsupportedOperationException(Msg.code(2199));
        }

        @Override
        public int loadFromPackage(NpmPackage pi, IContextResourceLoader loader) throws FHIRException {
                throw new UnsupportedOperationException(Msg.code(233));
        }

        @Override
        public int loadFromPackageAndDependencies(NpmPackage pi, IContextResourceLoader loader, BasePackageCacheManager pcm)
                        throws FHIRException {
                throw new UnsupportedOperationException(Msg.code(235));
        }

        @Override
        public boolean hasPackage(String id, String ver) {
                throw new UnsupportedOperationException(Msg.code(236));
        }

        @Override
        public boolean hasPackage(PackageInformation packageVersion) {
                return false;
        }

        @Override
        public PackageInformation getPackage(String id, String ver) {
                return null;
        }

        @Override
        public int getClientRetryCount() {
                throw new UnsupportedOperationException(Msg.code(237));
        }

        @Override
        public IWorkerContext setClientRetryCount(int value) {
                throw new UnsupportedOperationException(Msg.code(238));
        }

        @Override
        public TimeTracker clock() {
                return null;
        }

        @Override
        public IWorkerContextManager.IPackageLoadingTracker getPackageTracker() {
                throw new UnsupportedOperationException(Msg.code(2112));
        }

        @Override
        public PackageInformation getPackageForUrl(String s) {
                return null;
        }

        public static ConceptValidationOptions convertConceptValidationOptions(ValidationOptions theOptions) {
                ConceptValidationOptions retVal = new ConceptValidationOptions();
                if (theOptions.isGuessSystem()) {
                        retVal = retVal.setInferSystem(true);
                }
                return retVal;
        }

        @Override
        public <T extends Resource> List<T> fetchResourcesByType(Class<T> theClass) {
                if (theClass.equals(StructureDefinition.class)) {
                        return myValidationSupport.fetchAllStructureDefinitions();
                }

                throw new UnsupportedOperationException(Msg.code(2113) + "Can't fetch all resources of type: " + theClass);
        }

        @Override
        public <T extends Resource> List<T> fetchResourceVersionsByTypeAndUrl(Class<T> class_, String url) {
                throw new UnsupportedOperationException(
                                Msg.code(2796) + "Can't fetch all resources of type : " + class_ + " and url: " + url);
        }

        @Override
        public <T extends Resource> List<T> fetchResourcesByUrl(Class<T> class_, String url) {
                throw new UnsupportedOperationException(Msg.code(2508) + "Can't fetch all resources of url: " + url);
        }

        @Override
        public IWorkerContext setPackageTracker(IWorkerContextManager.IPackageLoadingTracker theIPackageLoadingTracker) {
                throw new UnsupportedOperationException(Msg.code(220));
        }

        @Override
        public String getSpecUrl() {
                return "";
        }

        @Override
        public PEBuilder getProfiledElementBuilder(
                        PEBuilder.PEElementPropertiesPolicy thePEElementPropertiesPolicy, boolean theB) {
                throw new UnsupportedOperationException(Msg.code(2261));
        }

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

        @Override
        public void setForPublication(boolean b) {
                throw new UnsupportedOperationException(Msg.code(2350));
        }

        @Override
        public OIDSummary urlsForOid(String oid, String resourceType) {
                throw new UnsupportedOperationException(Msg.code(2473));
        }

        @Override
        public <T extends Resource> T findTxResource(Class<T> class_, String canonical, Resource sourceOfReference) {
                throw new UnsupportedOperationException(Msg.code(2491));
        }

        @Override
        public <T extends Resource> T findTxResource(Class<T> class_, String canonical) {
                throw new UnsupportedOperationException(Msg.code(2492));
        }

        @Override
        public <T extends Resource> T findTxResource(Class<T> class_, String canonical, String version) {
                throw new UnsupportedOperationException(Msg.code(2493));
        }

        @Override
        public Boolean subsumes(ValidationOptions optionsArg, Coding parent, Coding child) {
                throw new UnsupportedOperationException(Msg.code(2488));
        }

        @Override
        public boolean isServerSideSystem(String url) {
                return false;
        }

        @Override
        public OperationOutcome validateTxResource(ValidationOptions options, Resource resource) {
                throw new UnsupportedOperationException(Msg.code(2734));
        }
}