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/*
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2024 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.context;

import ca.uhn.fhir.model.api.annotation.Child;
import ca.uhn.fhir.model.api.annotation.Description;
import org.hl7.fhir.instance.model.api.IBase;
import org.hl7.fhir.instance.model.api.IBaseReference;
import org.hl7.fhir.instance.model.api.IBaseResource;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class RuntimeChildResourceDefinition extends BaseRuntimeDeclaredChildDefinition {

	private BaseRuntimeElementDefinition myRuntimeDef;
	private List> myResourceTypes;
	private Set myValidChildNames;

	/**
	 * Constructor
	 */
	public RuntimeChildResourceDefinition(
			Field theField,
			String theElementName,
			Child theChildAnnotation,
			Description theDescriptionAnnotation,
			List> theResourceTypes) {
		super(theField, theChildAnnotation, theDescriptionAnnotation, theElementName);
		myResourceTypes = theResourceTypes;

		if (theResourceTypes == null || theResourceTypes.isEmpty()) {
			myResourceTypes = new ArrayList<>();
			myResourceTypes.add(IBaseResource.class);
		}
	}

	@Override
	public String getChildNameByDatatype(Class theDatatype) {
		if (IBaseReference.class.isAssignableFrom(theDatatype)) {
			return getElementName();
		}
		return null;
	}

	@Override
	public BaseRuntimeElementDefinition getChildElementDefinitionByDatatype(Class theDatatype) {
		if (IBaseReference.class.isAssignableFrom(theDatatype)) {
			return myRuntimeDef;
		}
		return null;
	}

	@Override
	public Set getValidChildNames() {
		return myValidChildNames;
	}

	@Override
	public BaseRuntimeElementDefinition getChildByName(String theName) {
		return myRuntimeDef;
	}

	@Override
	void sealAndInitialize(
			FhirContext theContext,
			Map, BaseRuntimeElementDefinition> theClassToElementDefinitions) {
		myRuntimeDef = findResourceReferenceDefinition(theClassToElementDefinitions);

		myValidChildNames = new HashSet();
		myValidChildNames.add(getElementName());

		/*
		 * [elementName]Resource is not actually valid FHIR but we've encountered it in the wild
		 * so we'll accept it just to be nice
		 */
		myValidChildNames.add(getElementName() + "Resource");

		/*
		 * Below has been disabled- We used to allow field names to contain the name of the resource
		 * that they accepted. This wasn't valid but we accepted it just to be flexible because there
		 * were some bad examples containing this. This causes conflicts with actual field names in
		 * recent definitions though, so it has been disabled as of HAPI 0.9
		 */
		//		for (Class next : myResourceTypes) {
		//			if (next == IResource.class) {
		//				for (Entry, BaseRuntimeElementDefinition> nextEntry :
		// theClassToElementDefinitions.entrySet()) {
		//					if (IResource.class.isAssignableFrom(nextEntry.getKey())) {
		//						RuntimeResourceDefinition nextDef = (RuntimeResourceDefinition) nextEntry.getValue();
		//						myValidChildNames.add(getElementName() + nextDef.getName());
		//					}
		//				}
		//			}
		//			else {
		//				RuntimeResourceDefinition nextDef = (RuntimeResourceDefinition) theClassToElementDefinitions.get(next);
		//				if (nextDef == null) {
		//					throw new ConfigurationException(Msg.code(1691) + "Can't find child of type: " + next.getCanonicalName()
		// + " in " + getField().getDeclaringClass());
		//				}
		//				myValidChildNames.add(getElementName() + nextDef.getName());
		//			}
		//		}

		myResourceTypes = Collections.unmodifiableList(myResourceTypes);
		myValidChildNames = Collections.unmodifiableSet(myValidChildNames);
	}

	public List> getResourceTypes() {
		return myResourceTypes;
	}

	@Override
	public String toString() {
		return getClass().getSimpleName() + "[" + getElementName() + "]";
	}
}