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package ca.uhn.fhir.rest.method;

/*
 * #%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.lang.reflect.Method;

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

import ca.uhn.fhir.context.ConfigurationException;
import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.model.valueset.BundleTypeEnum;
import ca.uhn.fhir.rest.api.RequestTypeEnum;
import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
import ca.uhn.fhir.rest.server.IBundleProvider;
import ca.uhn.fhir.rest.server.IRestfulServer;
import ca.uhn.fhir.rest.server.SimpleBundleProvider;
import ca.uhn.fhir.rest.server.exceptions.BaseServerResponseException;
import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
import ca.uhn.fhir.rest.server.exceptions.MethodNotAllowedException;

public class ConformanceMethodBinding extends BaseResourceReturningMethodBinding {

	public ConformanceMethodBinding(Method theMethod, FhirContext theContext, Object theProvider) {
		super(theMethod.getReturnType(), theMethod, theContext, theProvider);

//		if (Modifier.isAbstract(theMethod.getReturnType().getModifiers())) {
//			throw new ConfigurationException("Conformance resource provider method '" + theMethod.getName() + "' must not be abstract");
//		}
		MethodReturnTypeEnum methodReturnType = getMethodReturnType();
		Class genericReturnType = (Class) theMethod.getGenericReturnType();
		if (methodReturnType != MethodReturnTypeEnum.RESOURCE || !IBaseConformance.class.isAssignableFrom(genericReturnType)) {
			throw new ConfigurationException("Conformance resource provider method '" + theMethod.getName() + "' should return a Conformance resource class, returns: " + theMethod.getReturnType());
		}

	}

	@Override
	public ReturnTypeEnum getReturnType() {
		return ReturnTypeEnum.RESOURCE;
	}

	@Override
	public HttpGetClientInvocation invokeClient(Object[] theArgs) throws InternalErrorException {
		HttpGetClientInvocation retVal = MethodUtil.createConformanceInvocation(getContext());

		if (theArgs != null) {
			for (int idx = 0; idx < theArgs.length; idx++) {
				IParameter nextParam = getParameters().get(idx);
				nextParam.translateClientArgumentIntoQueryArgument(getContext(), theArgs[idx], null, null);
			}
		}

		return retVal;
	}

	@Override
	public IBundleProvider invokeServer(IRestfulServer theServer, RequestDetails theRequest, Object[] theMethodParams) throws BaseServerResponseException {
		IBaseResource conf = (IBaseResource) invokeServerMethod(theServer, theRequest, theMethodParams);
		return new SimpleBundleProvider(conf);
	}

	@Override
	public boolean incomingServerRequestMatchesMethod(RequestDetails theRequest) {
		if (theRequest.getRequestType() == RequestTypeEnum.OPTIONS) {
			if (theRequest.getOperation() == null && theRequest.getResourceName() == null) {
				return true;
			}
		}

		if (theRequest.getResourceName() != null) {
			return false;
		}
		
		if ("metadata".equals(theRequest.getOperation())) {
			if (theRequest.getRequestType() == RequestTypeEnum.GET) {
				return true;
			} else {
				throw new MethodNotAllowedException("/metadata request must use HTTP GET", RequestTypeEnum.GET);
			}
		}

		return false;
	}

	@Override
	public RestOperationTypeEnum getRestOperationType() {
		return RestOperationTypeEnum.METADATA;
	}

	@Override
	protected BundleTypeEnum getResponseBundleType() {
		return null;
	}

}