package ca.uhn.fhir.rest.server.interceptor.auth;

/*
 * #%L
 * HAPI FHIR - Server Framework
 * %%
 * Copyright (C) 2014 - 2021 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%
 */

import ca.uhn.fhir.interceptor.api.Pointcut;
import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
import ca.uhn.fhir.rest.api.server.RequestDetails;
import ca.uhn.fhir.rest.server.interceptor.auth.AuthorizationInterceptor.Verdict;
import org.hl7.fhir.instance.model.api.IBaseResource;
import org.hl7.fhir.instance.model.api.IIdType;

import java.util.Set;

public class RuleImplConditional extends BaseRule implements IAuthRule {

	private AppliesTypeEnum myAppliesTo;
	private Set<String> myAppliesToTypes;
	private RestOperationTypeEnum myOperationType;

	RuleImplConditional(String theRuleName) {
		super(theRuleName);
	}

	@Override
	public Verdict applyRule(RestOperationTypeEnum theOperation, RequestDetails theRequestDetails, IBaseResource theInputResource, IIdType theInputResourceId, IBaseResource theOutputResource,
									 IRuleApplier theRuleApplier, Set<AuthorizationFlagsEnum> theFlags, Pointcut thePointcut) {
		assert !(theInputResource != null && theOutputResource != null);

		if (theInputResourceId != null && theInputResourceId.hasIdPart()) {
			return null;
		}

		if (theOperation == myOperationType) {
			if (theRequestDetails.getConditionalUrl(myOperationType) == null) {
				return null;
			}

			switch (myAppliesTo) {
				case ALL_RESOURCES:
				case INSTANCES:
					break;
				case TYPES:
					if (myOperationType == RestOperationTypeEnum.DELETE) {
						String resourceName = theRequestDetails.getResourceName();
						if (!myAppliesToTypes.contains(resourceName)) {
							return null;
						}
					} else {
						String inputResourceName = theRequestDetails.getFhirContext().getResourceType(theInputResource);
						if (theInputResource == null || !myAppliesToTypes.contains(inputResourceName)) {
							return null;
						}
					}
					break;
			}

			return newVerdict(theOperation, theRequestDetails, theInputResource, theInputResourceId, theOutputResource);
		}

		return null;
	}

	void setAppliesTo(AppliesTypeEnum theAppliesTo) {
		myAppliesTo = theAppliesTo;
	}

	void setAppliesToTypes(Set<String> theAppliesToTypes) {
		myAppliesToTypes = theAppliesToTypes;
	}

	void setOperationType(RestOperationTypeEnum theOperationType) {
		myOperationType = theOperationType;
	}

}
