package ca.uhn.fhir.context;

/*
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2016 University Health Network
 * %%
 * 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.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.hl7.fhir.instance.model.api.IBase;
import org.hl7.fhir.instance.model.api.IBaseResource;

import ca.uhn.fhir.model.api.IResource;
import ca.uhn.fhir.model.api.annotation.ResourceDef;
import ca.uhn.fhir.util.UrlUtil;

public class RuntimeResourceDefinition extends BaseRuntimeElementCompositeDefinition<IBaseResource> {

        private RuntimeResourceDefinition myBaseDefinition;
        private FhirContext myContext;
        private String myId;
        private Map<String, RuntimeSearchParam> myNameToSearchParam = new LinkedHashMap<String, RuntimeSearchParam>();
        private IBaseResource myProfileDef;
        private String myResourceProfile;
        private List<RuntimeSearchParam> mySearchParams;
        private final FhirVersionEnum myStructureVersion;

        public RuntimeResourceDefinition(FhirContext theContext, String theResourceName, Class<? extends IBaseResource> theClass, ResourceDef theResourceAnnotation, boolean theStandardType) {
                super(theResourceName, theClass, theStandardType);
                myContext= theContext;
                myResourceProfile = theResourceAnnotation.profile();
                myId = theResourceAnnotation.id();
                
                try {
                        IBaseResource instance = theClass.newInstance();
                        myStructureVersion = instance.getStructureFhirVersionEnum();
                        assert myStructureVersion != null;
                } catch (Exception e) {
                        throw new ConfigurationException(myContext.getLocalizer().getMessage(getClass(), "nonInstantiableType", theClass.getName(), e.toString()), e);
                }
                
        }

        public void addSearchParam(RuntimeSearchParam theParam) {
                myNameToSearchParam.put(theParam.getName(), theParam);
        }

        /**
         * If this definition refers to a class which extends another resource definition type, this
         * method will return the definition of the topmost resource. For example, if this definition
         * refers to MyPatient2, which extends MyPatient, which in turn extends Patient, this method
         * will return the resource definition for Patient.
         * <p>
         * If the definition has no parent, returns <code>this</code>
         * </p>
         */
        public RuntimeResourceDefinition getBaseDefinition() {
                return myBaseDefinition;
        }

        @Override
        public ca.uhn.fhir.context.BaseRuntimeElementDefinition.ChildTypeEnum getChildType() {
                return ChildTypeEnum.RESOURCE;
        }

        public String getId() {
                return myId;
        }

        /**
         * Express {@link #getImplementingClass()} as theClass (to prevent casting warnings)
         */
        @SuppressWarnings("unchecked")
        public <T> Class<T> getImplementingClass(Class<T> theClass) {
                if (!theClass.isAssignableFrom(getImplementingClass())) {
                        throw new ConfigurationException("Unable to convert " + getImplementingClass() + " to " + theClass);
                }
                return (Class<T>) getImplementingClass();
        }

        @Deprecated
        public String getResourceProfile() {
                return myResourceProfile;
        }

        public String getResourceProfile(String theServerBase) {
                String profile;
                if (!myResourceProfile.isEmpty()) {
                        profile = myResourceProfile;
                } else if (!myId.isEmpty()) {
                        profile = myId;
                } else {
                        return "";
                }

                if (!UrlUtil.isValid(profile)) {
                        String resourceName = "/StructureDefinition/";
                        if (myContext.getVersion().getVersion() == FhirVersionEnum.DSTU1) {
                                resourceName = "/Profile/";
                        }
                        String profileWithUrl = theServerBase + resourceName + profile;
                        if (UrlUtil.isValid(profileWithUrl)) {
                                return profileWithUrl;
                        }
                }
                return profile;
        }

        public RuntimeSearchParam getSearchParam(String theName) {
                return myNameToSearchParam.get(theName);
        }

        public List<RuntimeSearchParam> getSearchParams() {
                return mySearchParams;
        }

        public FhirVersionEnum getStructureVersion() {
                return myStructureVersion;
        }

        public boolean isBundle() {
                return "Bundle".equals(getName());
        }

        public boolean isStandardProfile() {
                return myResourceProfile.startsWith("http://hl7.org/fhir/profiles");
        }

        @Override
        public void sealAndInitialize(FhirContext theContext, Map<Class<? extends IBase>, BaseRuntimeElementDefinition<?>> theClassToElementDefinitions) {
                super.sealAndInitialize(theContext, theClassToElementDefinitions);

                myNameToSearchParam = Collections.unmodifiableMap(myNameToSearchParam);

                ArrayList<RuntimeSearchParam> searchParams = new ArrayList<RuntimeSearchParam>(myNameToSearchParam.values());
                Collections.sort(searchParams, new Comparator<RuntimeSearchParam>() {
                        @Override
                        public int compare(RuntimeSearchParam theArg0, RuntimeSearchParam theArg1) {
                                return theArg0.getName().compareTo(theArg1.getName());
                        }
                });
                mySearchParams = Collections.unmodifiableList(searchParams);
                
                Class<?> target = getImplementingClass();
                myBaseDefinition = this;
                do {
                        target = target.getSuperclass();
                        if (IResource.class.isAssignableFrom(target) && target.getAnnotation(ResourceDef.class)!=null) {
                                myBaseDefinition = (RuntimeResourceDefinition) theClassToElementDefinitions.get(target);
                        }
                } while (target.equals(Object.class)==false);
        }

        @Deprecated
        public synchronized IBaseResource toProfile() {
                if (myProfileDef != null) {
                        return myProfileDef;
                }

                IBaseResource retVal = myContext.getVersion().generateProfile(this, null);
                myProfileDef = retVal;

                return retVal;
        }

        public synchronized IBaseResource toProfile(String theServerBase) {
                if (myProfileDef != null) {
                        return myProfileDef;
                }

                IBaseResource retVal = myContext.getVersion().generateProfile(this, theServerBase);
                myProfileDef = retVal;

                return retVal;
        }
}