/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.openflowplugin.applications.bulk.o.matic;

import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.*;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
import org.opendaylight.yang.gen.v1.urn.opendaylight.bulk.flow.service.rev150608.*;
import org.opendaylight.yang.gen.v1.urn.opendaylight.bulk.flow.service.rev150608.bulk.flow.ds.list.grouping.BulkFlowDsItem;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNode;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.Table;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.TableKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.Flow;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.FlowBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.FlowKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.*;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeRef;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.common.RpcError;
import org.opendaylight.yangtools.yang.common.RpcResult;
import org.opendaylight.yangtools.yang.common.RpcResultBuilder;

import javax.management.*;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.Future;

/**
 * Simple implementation providing bulk flows operations.
 */
public class SalBulkFlowServiceImpl implements SalBulkFlowService {

    private final SalFlowService flowService;
    private final DataBroker dataBroker;
    private FlowCounter flowCounterBeanImpl = new FlowCounter();
    private final ExecutorService fjService = new ForkJoinPool();
    public SalBulkFlowServiceImpl(SalFlowService flowService, DataBroker dataBroker) {
        this.flowService = Preconditions.checkNotNull(flowService);
        this.dataBroker = Preconditions.checkNotNull(dataBroker);
    }

    @Override
    public Future<RpcResult<Void>> addFlowsDs(AddFlowsDsInput input) {
        WriteTransaction writeTransaction = dataBroker.newWriteOnlyTransaction();
        boolean createParentsNextTime = MoreObjects.firstNonNull(input.isAlwaysCreateParents(), Boolean.FALSE);
        boolean createParents = true;
        for (BulkFlowDsItem bulkFlow : input.getBulkFlowDsItem()) {
            FlowBuilder flowBuilder = new FlowBuilder(bulkFlow);
            flowBuilder.setTableId(bulkFlow.getTableId());
            flowBuilder.setId(new FlowId(bulkFlow.getFlowId()));
            writeTransaction.put(LogicalDatastoreType.CONFIGURATION, getFlowInstanceIdentifier(bulkFlow),
                    flowBuilder.build(), createParents);
            createParents = createParentsNextTime;
        }
        CheckedFuture<Void, TransactionCommitFailedException> submitFuture = writeTransaction.submit();
        return handleResultFuture(submitFuture);
    }

    private InstanceIdentifier<Flow> getFlowInstanceIdentifier(BulkFlowDsItem bulkFlow) {
        final NodeRef nodeRef = bulkFlow.getNode();
        return ((InstanceIdentifier<Node>) nodeRef.getValue())
                .augmentation(FlowCapableNode.class)
                .child(Table.class, new TableKey(bulkFlow.getTableId()))
                .child(org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.Flow.class,
                        new FlowKey(new FlowId(bulkFlow.getFlowId())));
    }

    @Override
    public Future<RpcResult<Void>> removeFlowsDs(RemoveFlowsDsInput input) {
        WriteTransaction writeTransaction = dataBroker.newWriteOnlyTransaction();
        for (BulkFlowDsItem bulkFlow : input.getBulkFlowDsItem()) {
            writeTransaction.delete(LogicalDatastoreType.CONFIGURATION, getFlowInstanceIdentifier(bulkFlow));
        }
        CheckedFuture<Void, TransactionCommitFailedException> submitFuture = writeTransaction.submit();
        return handleResultFuture(submitFuture);
    }

    private ListenableFuture<RpcResult<Void>> handleResultFuture(CheckedFuture<Void,
            TransactionCommitFailedException> submitFuture) {
        final SettableFuture<RpcResult<Void>> rpcResult = SettableFuture.create();
        Futures.addCallback(submitFuture, new FutureCallback<Void>() {
            @Override
            public void onSuccess(Void result) {
                rpcResult.set(RpcResultBuilder.success(result).build());
            }

            @Override
            public void onFailure(Throwable t) {
                RpcResultBuilder<Void> rpcResultBld = RpcResultBuilder.<Void>failed()
                        .withRpcErrors(Collections.singleton(
                                RpcResultBuilder.newError(RpcError.ErrorType.APPLICATION, null, t.getMessage())
                        ));
                rpcResult.set(rpcResultBld.build());
            }
        });
        return rpcResult;
    }

    private <T> ListenableFuture<RpcResult<Void>> handleResultFuture(ListenableFuture<List<T>> submitFuture) {
        final SettableFuture<RpcResult<Void>> rpcResult = SettableFuture.create();
        Futures.addCallback(submitFuture, new FutureCallback<List<T>>() {
            @Override
            public void onSuccess(List<T> result) {
                rpcResult.set(RpcResultBuilder.success((Void) null).build());
            }

            @Override
            public void onFailure(Throwable t) {
                RpcResultBuilder<Void> rpcResultBld = RpcResultBuilder.<Void>failed()
                        .withRpcErrors(Collections.singleton(
                                RpcResultBuilder.newError(RpcError.ErrorType.APPLICATION, null, t.getMessage())
                        ));
                rpcResult.set(rpcResultBld.build());
            }
        });
        return rpcResult;
    }

    @Override
    public Future<RpcResult<Void>> addFlowsRpc(AddFlowsRpcInput input) {
        List<ListenableFuture<RpcResult<AddFlowOutput>>> bulkResults = new ArrayList<>();

        for (BulkFlowBaseContentGrouping bulkFlow : input.getBulkFlowItem()) {
            AddFlowInputBuilder flowInputBuilder = new AddFlowInputBuilder((Flow) bulkFlow);
            final NodeRef nodeRef = bulkFlow.getNode();
            flowInputBuilder.setNode(nodeRef);
            flowInputBuilder.setTableId(bulkFlow.getTableId());
            Future<RpcResult<AddFlowOutput>> rpcAddFlowResult = flowService.addFlow(flowInputBuilder.build());
            bulkResults.add(JdkFutureAdapters.listenInPoolThread(rpcAddFlowResult));
        }
        return handleResultFuture(Futures.allAsList(bulkResults));
    }

    @Override
    public Future<RpcResult<Void>> readFlowTest(ReadFlowTestInput input) {
        FlowReader flowReader = FlowReader.getNewInstance(dataBroker,
                input.getDpnCount().intValue(),
                input.getFlowsPerDpn().intValue(), input.isVerbose(),
                input.isIsConfigDs(),input.getStartTableId().shortValue(),
                input.getEndTableId().shortValue());
        flowCounterBeanImpl.setReader(flowReader);
        fjService.execute(flowReader);
        RpcResultBuilder<Void> rpcResultBuilder = RpcResultBuilder.success();
        return Futures.immediateFuture(rpcResultBuilder.build());
    }

    @Override
    public Future<RpcResult<Void>> flowRpcAddTest(FlowRpcAddTestInput input) {
        FlowWriterDirectOFRpc flowAddRpcTestImpl = new FlowWriterDirectOFRpc(dataBroker, flowService, fjService);
        flowAddRpcTestImpl.rpcFlowAdd(
                input.getDpnId(),
                input.getFlowCount().intValue(),
                input.getRpcBatchSize().intValue());


        RpcResultBuilder<Void> rpcResultBuilder = RpcResultBuilder.success();
        return Futures.immediateFuture(rpcResultBuilder.build());
    }

    @Override
    public Future<RpcResult<Void>> register() {
        RpcResultBuilder<Void> rpcResultBuilder = RpcResultBuilder.success();
        try {
        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        String pathToMBean = String.format("%s:type=%s",
                FlowCounter.class.getPackage().getName(),
                FlowCounter.class.getSimpleName());
        ObjectName name = null;

            name = new ObjectName(pathToMBean);
            mbs.registerMBean(flowCounterBeanImpl, name);
        } catch (MalformedObjectNameException | InstanceAlreadyExistsException
                | MBeanRegistrationException | NotCompliantMBeanException e) {
            rpcResultBuilder = RpcResultBuilder.failed();
            e.printStackTrace();
        }
        return Futures.immediateFuture(rpcResultBuilder.build());
    }

    @Override
    public Future<RpcResult<Void>> removeFlowsRpc(RemoveFlowsRpcInput input) {
        List<ListenableFuture<RpcResult<RemoveFlowOutput>>> bulkResults = new ArrayList<>();

        for (BulkFlowBaseContentGrouping bulkFlow : input.getBulkFlowItem()) {
            RemoveFlowInputBuilder flowInputBuilder = new RemoveFlowInputBuilder((Flow) bulkFlow);
            final NodeRef nodeRef = bulkFlow.getNode();
            flowInputBuilder.setNode(nodeRef);
            flowInputBuilder.setTableId(bulkFlow.getTableId());
            Future<RpcResult<RemoveFlowOutput>> rpcAddFlowResult = flowService.removeFlow(flowInputBuilder.build());
            bulkResults.add(JdkFutureAdapters.listenInPoolThread(rpcAddFlowResult));
        }
        return handleResultFuture(Futures.allAsList(bulkResults));
    }

    @Override
    public Future<RpcResult<Void>> flowTest(FlowTestInput input) {
        if (input.isTxChain()) {
            FlowWriterTxChain flowTester = new FlowWriterTxChain(dataBroker, fjService);
            flowCounterBeanImpl.setWriter(flowTester);
            if (input.isIsAdd()){
                flowTester.addFlows(input.getDpnCount().intValue(), input.getFlowsPerDpn().intValue(),
                        input.getBatchSize().intValue(), input.getSleepFor().intValue(),
                        input.getSleepAfter().intValue(), input.getStartTableId().shortValue(),
                        input.getEndTableId().shortValue());
            } else {
                flowTester.deleteFlows(input.getDpnCount().intValue(), input.getFlowsPerDpn().intValue(),
                        input.getBatchSize().intValue(), input.getStartTableId().shortValue(),
                        input.getEndTableId().shortValue());
            }
            RpcResultBuilder<Void> rpcResultBuilder = RpcResultBuilder.success();
            return Futures.immediateFuture(rpcResultBuilder.build());
        }
        if (input.isSeq()) {
            FlowWriterSequential flowTester = new FlowWriterSequential(dataBroker, fjService);
            flowCounterBeanImpl.setWriter(flowTester);
            if (input.isIsAdd()){
                flowTester.addFlows(input.getDpnCount().intValue(), input.getFlowsPerDpn().intValue(),
                        input.getBatchSize().intValue(), input.getSleepFor().intValue(),
                        input.getStartTableId().shortValue(), input.getEndTableId().shortValue());
            } else {
                flowTester.deleteFlows(input.getDpnCount().intValue(), input.getFlowsPerDpn().intValue(),
                        input.getBatchSize().intValue(), input.getStartTableId().shortValue(),
                        input.getEndTableId().shortValue());
            }
        } else {
            FlowWriterConcurrent flowTester = new FlowWriterConcurrent(dataBroker, fjService);
            flowCounterBeanImpl.setWriter(flowTester);
            if (input.isIsAdd()){
                flowTester.addFlows(input.getDpnCount().intValue(), input.getFlowsPerDpn().intValue(),
                        input.getBatchSize().intValue(), input.getSleepFor().intValue(),
                        input.getSleepAfter().intValue(), input.getStartTableId().shortValue(),
                        input.getEndTableId().shortValue());
            } else {
                flowTester.deleteFlows(input.getDpnCount().intValue(), input.getFlowsPerDpn().intValue(),
                        input.getBatchSize().intValue(), input.getStartTableId().shortValue(),
                        input.getEndTableId().shortValue());
            }
        }
        RpcResultBuilder<Void> rpcResultBuilder = RpcResultBuilder.success();
        return Futures.immediateFuture(rpcResultBuilder.build());
    }

    @Override
    public Future<RpcResult<Void>> flowRpcAddMultiple(FlowRpcAddMultipleInput input) {
        FlowWriterDirectOFRpc flowTesterRPC = new FlowWriterDirectOFRpc(dataBroker, flowService, fjService);
        flowTesterRPC.rpcFlowAddAll(input.getFlowCount().intValue(), input.getRpcBatchSize().intValue());
        RpcResultBuilder<Void> rpcResultBuilder = RpcResultBuilder.success();
        return Futures.immediateFuture(rpcResultBuilder.build());
    }
}