/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.so.client.adapter.network.mapper;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.UUID;

import org.modelmapper.ModelMapper;
import org.modelmapper.PropertyMap;
import org.onap.so.adapters.nwrest.ContrailNetwork;
import org.onap.so.adapters.nwrest.CreateNetworkRequest;
import org.onap.so.adapters.nwrest.CreateNetworkResponse;
import org.onap.so.adapters.nwrest.DeleteNetworkRequest;
import org.onap.so.adapters.nwrest.ProviderVlanNetwork;
import org.onap.so.adapters.nwrest.RollbackNetworkRequest;
import org.onap.so.adapters.nwrest.UpdateNetworkRequest;
import org.onap.so.bpmn.core.UrnPropertiesReader;
import org.onap.so.bpmn.servicedecomposition.bbobjects.CloudRegion;
import org.onap.so.bpmn.servicedecomposition.bbobjects.Customer;
import org.onap.so.bpmn.servicedecomposition.bbobjects.L3Network;
import org.onap.so.bpmn.servicedecomposition.bbobjects.NetworkPolicy;
import org.onap.so.bpmn.servicedecomposition.bbobjects.RouteTableReference;
import org.onap.so.bpmn.servicedecomposition.bbobjects.ServiceInstance;
import org.onap.so.bpmn.servicedecomposition.bbobjects.VpnBinding;
import org.onap.so.bpmn.servicedecomposition.generalobjects.OrchestrationContext;
import org.onap.so.bpmn.servicedecomposition.generalobjects.RequestContext;
import org.onap.so.bpmn.servicedecomposition.modelinfo.ModelInfoNetwork;
import org.onap.so.entity.MsoRequest;
import org.onap.so.openstack.beans.NetworkRollback;
import org.onap.so.openstack.beans.RouteTarget;
import org.onap.so.openstack.beans.Subnet;
import org.springframework.stereotype.Component;
import org.springframework.web.util.UriUtils;

@Component
public class NetworkAdapterObjectMapper {
	private static final ModelMapper modelMapper = new ModelMapper();
	private static String FORWARD_SLASH = "/";

	public CreateNetworkRequest createNetworkRequestMapper(RequestContext requestContext, CloudRegion cloudRegion, OrchestrationContext orchestrationContext, ServiceInstance serviceInstance, L3Network l3Network, Map<String, String> userInput, String cloudRegionPo, Customer customer) throws UnsupportedEncodingException {
		CreateNetworkRequest createNetworkRequest = new CreateNetworkRequest();
		
		//set cloudSiteId as determined for cloud region PO instead of cloudRegion.getLcpCloudRegionId()
		createNetworkRequest.setCloudSiteId(cloudRegionPo);
		createNetworkRequest.setTenantId(cloudRegion.getTenantId());
		createNetworkRequest.setNetworkId(l3Network.getNetworkId());
		createNetworkRequest.setNetworkName(l3Network.getNetworkName());
		//TODO fields not available
		createNetworkRequest.setNetworkType(l3Network.getNetworkType());
		//createNetworkRequest.setNetworkTypeVersion(serviceInstance.getModelInfoServiceInstance().getModelVersion());
		ModelInfoNetwork modelInfoNetwork  = l3Network.getModelInfoNetwork();
		if (modelInfoNetwork != null){
			createNetworkRequest.setModelCustomizationUuid(modelInfoNetwork.getModelCustomizationUUID());
		}

		//build and set Subnet list
		createNetworkRequest.setSubnets(buildOpenstackSubnetList(l3Network));
		
		//build and set provider Vlan Network
		ProviderVlanNetwork providerVlanNetwork = buildProviderVlanNetwork(l3Network);
		createNetworkRequest.setProviderVlanNetwork(providerVlanNetwork);
		
		//build and set Contrail Network
		ContrailNetwork contrailNetwork = buildContrailNetwork(l3Network, customer);
		createNetworkRequest.setContrailNetwork(contrailNetwork);
		
		//set Network Parameters from VID request
		createNetworkRequest.setNetworkParams(userInput);
		
		createNetworkRequest = setFlowFlags(createNetworkRequest, orchestrationContext);

		createNetworkRequest.setMsoRequest(createMsoRequest(requestContext, serviceInstance));
		
		String messageId = getRandomUuid();
		createNetworkRequest.setMessageId(messageId);
		//TODO clarify callback URL build process
		//createNetworkRequest.setNotificationUrl(createCallbackUrl("NetworkAResponse", messageId));

		return createNetworkRequest;
	}
	
	public DeleteNetworkRequest deleteNetworkRequestMapper(RequestContext requestContext, CloudRegion cloudRegion, ServiceInstance serviceInstance, L3Network l3Network) throws UnsupportedEncodingException {
		DeleteNetworkRequest deleteNetworkRequest = new DeleteNetworkRequest();
		
		deleteNetworkRequest.setCloudSiteId(cloudRegion.getLcpCloudRegionId());
		
		String messageId = getRandomUuid();
		deleteNetworkRequest.setMessageId(messageId);
		
		ModelInfoNetwork modelInfoNetwork  = l3Network.getModelInfoNetwork();
		if (modelInfoNetwork != null){
			deleteNetworkRequest.setModelCustomizationUuid(modelInfoNetwork.getModelCustomizationUUID());
		}
		
		deleteNetworkRequest.setMsoRequest(createMsoRequest(requestContext, serviceInstance));
		deleteNetworkRequest.setNetworkId(l3Network.getNetworkId());
		deleteNetworkRequest.setNetworkStackId(l3Network.getHeatStackId());
		deleteNetworkRequest.setNetworkType(l3Network.getNetworkType());
		deleteNetworkRequest.setSkipAAI(true);
		deleteNetworkRequest.setTenantId(cloudRegion.getTenantId());
		
		return deleteNetworkRequest;
	}
	
	/**
	 * Access method to build Rollback Network Request
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public RollbackNetworkRequest createNetworkRollbackRequestMapper(RequestContext requestContext, CloudRegion cloudRegion, OrchestrationContext orchestrationContext, ServiceInstance serviceInstance, L3Network l3Network, Map<String, String> userInput, String cloudRegionPo, CreateNetworkResponse createNetworkResponse) throws UnsupportedEncodingException {
		RollbackNetworkRequest rollbackNetworkRequest = new RollbackNetworkRequest();
		
		rollbackNetworkRequest = setCommonRollbackRequestFields(rollbackNetworkRequest, requestContext);
		
		NetworkRollback networkRollback = buildNetworkRollback(l3Network, cloudRegion, cloudRegionPo, createNetworkResponse);
		rollbackNetworkRequest.setNetworkRollback(networkRollback);
		
		return rollbackNetworkRequest;
	}
	
	public UpdateNetworkRequest createNetworkUpdateRequestMapper(RequestContext requestContext, CloudRegion cloudRegion, OrchestrationContext orchestrationContext, ServiceInstance serviceInstance, L3Network l3Network, Map<String, String> userInput, Customer customer) throws UnsupportedEncodingException {
		UpdateNetworkRequest updateNetworkRequest = new UpdateNetworkRequest();
		
		updateNetworkRequest.setCloudSiteId(cloudRegion.getLcpCloudRegionId());
		updateNetworkRequest.setTenantId(cloudRegion.getTenantId());
		updateNetworkRequest.setNetworkId(l3Network.getNetworkId());
		updateNetworkRequest.setNetworkStackId(l3Network.getHeatStackId());
		updateNetworkRequest.setNetworkName(l3Network.getNetworkName());
		updateNetworkRequest.setNetworkType(l3Network.getModelInfoNetwork().getNetworkType());
		updateNetworkRequest.setNetworkTypeVersion(l3Network.getModelInfoNetwork().getModelVersion());
		updateNetworkRequest.setModelCustomizationUuid(l3Network.getModelInfoNetwork().getModelCustomizationUUID());
		updateNetworkRequest.setSubnets(buildOpenstackSubnetList(l3Network));
		updateNetworkRequest.setProviderVlanNetwork(buildProviderVlanNetwork(l3Network));
		updateNetworkRequest.setContrailNetwork(buildContrailNetwork(l3Network, customer));
		updateNetworkRequest.setNetworkParams(userInput);
		updateNetworkRequest.setMsoRequest(createMsoRequest(requestContext, serviceInstance));
		
		setFlowFlags(updateNetworkRequest, orchestrationContext);
		
		String messageId = getRandomUuid();
		updateNetworkRequest.setMessageId(messageId);
		updateNetworkRequest.setNotificationUrl(createCallbackUrl("NetworkAResponse", messageId));
		
		return updateNetworkRequest;
	}
	
	private RollbackNetworkRequest setCommonRollbackRequestFields(RollbackNetworkRequest request,RequestContext requestContext){
		//TODO confirm flag value
		request.setSkipAAI(true);
		request.setMessageId(requestContext.getMsoRequestId());
		//TODO clarify callback URL build process. This will also set SYNC flag
		//request.setNotificationUrl(createCallbackUrl("NetworkAResponse", messageId));
		return request;
	}
	
	private NetworkRollback buildNetworkRollback(L3Network l3Network, CloudRegion cloudRegion, String cloudRegionPo, CreateNetworkResponse createNetworkResponse){
		NetworkRollback networkRollback = new NetworkRollback();
		networkRollback.setNetworkId(l3Network.getNetworkId());
		networkRollback.setNeutronNetworkId(createNetworkResponse.getMessageId());
		networkRollback.setNetworkStackId(createNetworkResponse.getNetworkStackId());
		networkRollback.setTenantId(cloudRegion.getTenantId());
		networkRollback.setCloudId(cloudRegionPo);
		networkRollback.setNetworkType(l3Network.getNetworkType());
		ModelInfoNetwork modelInfoNetwork  = l3Network.getModelInfoNetwork();
		if (modelInfoNetwork != null){
			networkRollback.setModelCustomizationUuid(modelInfoNetwork.getModelCustomizationUUID());
		}
		//rollback will only be called when network was actually created
		networkRollback.setNetworkCreated(createNetworkResponse.getNetworkCreated());
		//TODO confirm below not required for create rollback
		//NetworkName
		//PhysicalNetwork
		//Vlans
		//msoRequest
		return networkRollback;
	}
	
	public MsoRequest createMsoRequest(RequestContext requestContext, ServiceInstance serviceInstance) {
		MsoRequest msoRequest = new MsoRequest();
		msoRequest.setRequestId(requestContext.getMsoRequestId());
		msoRequest.setServiceInstanceId(serviceInstance.getServiceInstanceId());
		return msoRequest;
	}
	
	protected String getRandomUuid() {
		return UUID.randomUUID().toString();
	}
	
	protected String createCallbackUrl(String messageType, String correlator) throws UnsupportedEncodingException {
		String endpoint = this.getEndpoint();

		while (endpoint.endsWith("/")) {
			endpoint = endpoint.substring(0, endpoint.length()-1);
		}
		return endpoint + "/" + UriUtils.encodePathSegment(messageType, "UTF-8") + "/" + UriUtils.encodePathSegment(correlator, "UTF-8");
	}
	
	protected String getEndpoint() {
		return UrnPropertiesReader.getVariable("mso.workflow.message.endpoint");
	}
	/**
	 * Use BB L3Network object to build subnets list of type org.onap.so.openstack.beans.Subnet
	 * @param L3Network
	 * @return List<org.onap.so.openstack.beans.Subnet>
	 */
	private List<Subnet> buildOpenstackSubnetList(L3Network l3Network){
		
		List<org.onap.so.bpmn.servicedecomposition.bbobjects.Subnet> subnets = l3Network.getSubnets();
		List<org.onap.so.openstack.beans.Subnet> subnetList = new ArrayList<org.onap.so.openstack.beans.Subnet>();
		//create mapper from onap Subnet to openstack bean Subnet
		if(modelMapper.getTypeMap(org.onap.so.bpmn.servicedecomposition.bbobjects.Subnet.class, org.onap.so.openstack.beans.Subnet.class) == null) {
			PropertyMap<org.onap.so.bpmn.servicedecomposition.bbobjects.Subnet, org.onap.so.openstack.beans.Subnet> personMap = new PropertyMap<org.onap.so.bpmn.servicedecomposition.bbobjects.Subnet, org.onap.so.openstack.beans.Subnet>() {
				  protected void configure() {
				    map().setSubnetName(source.getSubnetName());
				    map(source.getSubnetId(), destination.getSubnetId());
				    map(source.getNeutronSubnetId(), destination.getNeutronId());
				    map(source.getGatewayAddress(), destination.getGatewayIp());
				    map(source.getIpVersion(), destination.getIpVersion());
				    map(source.isDhcpEnabled(), destination.getEnableDHCP());
				  }
				};
			modelMapper.addMappings(personMap);
		}
		
		for (org.onap.so.bpmn.servicedecomposition.bbobjects.Subnet subnet : subnets) {
			org.onap.so.openstack.beans.Subnet openstackSubnet = modelMapper.map(subnet, org.onap.so.openstack.beans.Subnet.class);
			//update cidr value
			if (subnet.getNetworkStartAddress() != null && subnet.getCidrMask() != null)
				openstackSubnet.setCidr(subnet.getNetworkStartAddress().concat(FORWARD_SLASH).concat(subnet.getCidrMask()));
			List<org.onap.so.bpmn.servicedecomposition.bbobjects.HostRoute> hostRouteList = subnet.getHostRoutes();
			List<org.onap.so.openstack.beans.HostRoute> openstackHostRouteList = new ArrayList<>();
			org.onap.so.openstack.beans.HostRoute openstackHostRoute = new org.onap.so.openstack.beans.HostRoute();
			//TODO only 2 fields available on openstack object. Confirm it is sufficient or add as needed
			for (org.onap.so.bpmn.servicedecomposition.bbobjects.HostRoute hostRoute : hostRouteList) {
				openstackHostRoute.setNextHop(hostRoute.getNextHop());
				openstackHostRoute.setPrefix(hostRoute.getRoutePrefix());
				//add host route to the list
				openstackHostRouteList.add(openstackHostRoute);
			}
			openstackSubnet.setHostRoutes(openstackHostRouteList);
			//add subnet to the list
			subnetList.add(openstackSubnet);
		}
		return subnetList;
	}
	
	private ProviderVlanNetwork buildProviderVlanNetwork(L3Network l3Network){
		ProviderVlanNetwork providerVlanNetwork = new ProviderVlanNetwork();
		providerVlanNetwork.setPhysicalNetworkName(l3Network.getPhysicalNetworkName());
		List<Integer> vlans = new ArrayList<Integer>();
		List<org.onap.so.bpmn.servicedecomposition.bbobjects.SegmentationAssignment> segmentationAssignments = l3Network.getSegmentationAssignments();
		for (org.onap.so.bpmn.servicedecomposition.bbobjects.SegmentationAssignment assignment : segmentationAssignments) {
			vlans.add(Integer.valueOf(assignment.getSegmentationId()));
		}
		providerVlanNetwork.setVlans(vlans);
		return providerVlanNetwork;
	}

	private ContrailNetwork buildContrailNetwork(L3Network l3Network, Customer customer){
		ContrailNetwork contrailNetwork = new ContrailNetwork();
		contrailNetwork.setExternal(Optional.ofNullable(l3Network.isIsExternalNetwork()).orElse(false).toString());
		contrailNetwork.setShared(Optional.ofNullable(l3Network.isIsSharedNetwork()).orElse(false).toString());
		contrailNetwork.setPolicyFqdns(buildPolicyFqdns(l3Network.getNetworkPolicies()));
		contrailNetwork.setRouteTableFqdns(buildRouteTableFqdns(l3Network.getContrailNetworkRouteTableReferences()));
		if(customer!= null)
			contrailNetwork.setRouteTargets(buildRouteTargets(customer.getVpnBindings()));
		//PolicyFqdns(policyFqdns); --- is set in getAAINetworkPolicy
		//RouteTableFqdns(routeTableFqdns); --- is set in getAAINetworkTableRef
		//RouteTargets(routeTargets); --- is set in getAAINetworkVpnBinding
		return contrailNetwork;
	}
	
	private List<String> buildPolicyFqdns(List<NetworkPolicy> networkPolicies) {
		List<String> policyFqdns = new ArrayList<>();
		for(NetworkPolicy networkPolicy : networkPolicies) {
			policyFqdns.add(networkPolicy.getNetworkPolicyFqdn());
		}
		return policyFqdns;
	}
	
	private List<String> buildRouteTableFqdns(List<RouteTableReference> contrailNetworkRouteTableReferences) {
		List<String> routeTableFqdns = new ArrayList<>();
		for(RouteTableReference routeTableReference : contrailNetworkRouteTableReferences) {
			routeTableFqdns.add(routeTableReference.getRouteTableReferenceFqdn());
		}
		return routeTableFqdns;
	}

	private List<RouteTarget> buildRouteTargets(List<VpnBinding> vpnBindings) {
		if(modelMapper.getTypeMap(org.onap.so.bpmn.servicedecomposition.bbobjects.RouteTarget.class, RouteTarget.class) == null) {
			modelMapper.addMappings(new PropertyMap<org.onap.so.bpmn.servicedecomposition.bbobjects.RouteTarget, RouteTarget>() {
				@Override
				protected void configure() {
					map().setRouteTarget(source.getGlobalRouteTarget());
					map().setRouteTargetRole(source.getRouteTargetRole());
				}
			});
		}
		
		List<RouteTarget> routeTargets = new ArrayList<>();
		for(VpnBinding vpnBinding : vpnBindings) {
			for(org.onap.so.bpmn.servicedecomposition.bbobjects.RouteTarget routeTarget : vpnBinding.getRouteTargets()) {
				routeTargets.add(modelMapper.map(routeTarget, RouteTarget.class));
			}
		}
		return routeTargets;
	}

	private CreateNetworkRequest setFlowFlags(CreateNetworkRequest createNetworkRequest, OrchestrationContext orchestrationContext){
		//TODO confirm flag value
		createNetworkRequest.setSkipAAI(true);
		//revert suppressRollabck=TRUE into backout=FALSE and vice versa
		createNetworkRequest.setBackout(orchestrationContext.getIsRollbackEnabled());
		//TODO confirm value - false by default
		createNetworkRequest.setFailIfExists(true);
		//NetworkTechnology(NetworkTechnology.NEUTRON); NOOP - default
		return createNetworkRequest;
	}
	
	private void setFlowFlags(UpdateNetworkRequest updateNetworkRequest, OrchestrationContext orchestrationContext){
		updateNetworkRequest.setSkipAAI(true);
		//revert suppressRollabck=TRUE into backout=FALSE and vice versa
		updateNetworkRequest.setBackout(!Boolean.TRUE.equals(orchestrationContext.getIsRollbackEnabled()));
		//NetworkTechnology(NetworkTechnology.NEUTRON); NOOP - default
	}
}