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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.nifi.nar;

import org.apache.nifi.bundle.BundleCoordinate;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.function.BiFunction;

public class ExtensionMapping {

    private final Map> processorNames = new HashMap<>();
    private final Map> controllerServiceNames = new HashMap<>();
    private final Map> reportingTaskNames = new HashMap<>();
    private final Map> flowAnalysisRuleNames = new HashMap<>();
    private final Map> parameterProviderNames = new HashMap<>();
    private final Map> flowRegistryClientNames = new HashMap<>();

    private final BiFunction, Set, Set> merger = (oldValue, newValue) -> {
        final Set merged = new HashSet<>();
        merged.addAll(oldValue);
        merged.addAll(newValue);
        return merged;
    };

    void addProcessor(final BundleCoordinate coordinate, final String processorName) {
        processorNames.computeIfAbsent(processorName, name -> new HashSet<>()).add(coordinate);
    }

    void addAllProcessors(final BundleCoordinate coordinate, final Collection processorNames) {
        processorNames.forEach(name -> {
            addProcessor(coordinate, name);
        });
    }

    void addControllerService(final BundleCoordinate coordinate, final String controllerServiceName) {
        controllerServiceNames.computeIfAbsent(controllerServiceName, name -> new HashSet<>()).add(coordinate);
    }

    void addAllControllerServices(final BundleCoordinate coordinate, final Collection controllerServiceNames) {
        controllerServiceNames.forEach(name -> {
            addControllerService(coordinate, name);
        });
    }

    void addReportingTask(final BundleCoordinate coordinate, final String reportingTaskName) {
        reportingTaskNames.computeIfAbsent(reportingTaskName, name -> new HashSet<>()).add(coordinate);
    }

    void addAllReportingTasks(final BundleCoordinate coordinate, final Collection reportingTaskNames) {
        reportingTaskNames.forEach(name -> {
            addReportingTask(coordinate, name);
        });
    }

    void addFlowAnalysisRule(final BundleCoordinate coordinate, final String flowAnalysisRuleName) {
        flowAnalysisRuleNames.computeIfAbsent(flowAnalysisRuleName, name -> new HashSet<>()).add(coordinate);
    }

    void addAllFlowAnalysisRules(final BundleCoordinate coordinate, final Collection flowAnalysisRuleNames) {
        flowAnalysisRuleNames.forEach(name -> {
            addFlowAnalysisRule(coordinate, name);
        });
    }

    void addParameterProvider(final BundleCoordinate coordinate, final String parameterProviderName) {
        parameterProviderNames.computeIfAbsent(parameterProviderName, name -> new HashSet<>()).add(coordinate);
    }

    void addAllParameterProviders(final BundleCoordinate coordinate, final Collection parameterProviderNames) {
        parameterProviderNames.forEach(name -> {
            addParameterProvider(coordinate, name);
        });
    }

    void addFlowRegistryClient(final BundleCoordinate coordinate, final String flowRegistryClientName) {
        parameterProviderNames.computeIfAbsent(flowRegistryClientName, name -> new HashSet<>()).add(coordinate);
    }

    void addAllFlowRegistryClients(final BundleCoordinate coordinate, final Collection flowRegistryClientNames) {
        flowRegistryClientNames.forEach(name -> {
            addFlowRegistryClient(coordinate, name);
        });
    }

    void merge(final ExtensionMapping other) {
        other.getProcessorNames().forEach((name, otherCoordinates) -> {
            processorNames.merge(name, otherCoordinates, merger);
        });
        other.getControllerServiceNames().forEach((name, otherCoordinates) -> {
            controllerServiceNames.merge(name, otherCoordinates, merger);
        });
        other.getReportingTaskNames().forEach((name, otherCoordinates) -> {
            reportingTaskNames.merge(name, otherCoordinates, merger);
        });
        other.getFlowAnalysisRuleNames().forEach((name, otherCoordinates) -> {
            flowAnalysisRuleNames.merge(name, otherCoordinates, merger);
        });
        other.getParameterProviderNames().forEach((name, otherCoordinates) -> {
            parameterProviderNames.merge(name, otherCoordinates, merger);
        });
        other.getFlowRegistryClientNames().forEach((name, otherCoordinates) -> {
            flowRegistryClientNames.merge(name, otherCoordinates, merger);
        });
    }

    public Map> getProcessorNames() {
        return Collections.unmodifiableMap(processorNames);
    }

    public Map> getControllerServiceNames() {
        return Collections.unmodifiableMap(controllerServiceNames);
    }

    public Map> getReportingTaskNames() {
        return Collections.unmodifiableMap(reportingTaskNames);
    }

    public Map> getFlowAnalysisRuleNames() {
        return Collections.unmodifiableMap(flowAnalysisRuleNames);
    }

    public Map> getParameterProviderNames() {
        return Collections.unmodifiableMap(parameterProviderNames);
    }

    public Map> getFlowRegistryClientNames() {
        return Collections.unmodifiableMap(flowRegistryClientNames);
    }

    public Map> getAllExtensionNames() {
        final Map> extensionNames = new HashMap<>();
        extensionNames.putAll(processorNames);
        extensionNames.putAll(controllerServiceNames);
        extensionNames.putAll(reportingTaskNames);
        extensionNames.putAll(flowAnalysisRuleNames);
        extensionNames.putAll(parameterProviderNames);
        extensionNames.putAll(flowRegistryClientNames);
        return extensionNames;
    }

    public int size() {
        int size = 0;

        for (final Set coordinates : processorNames.values()) {
            size += coordinates.size();
        }
        for (final Set coordinates : controllerServiceNames.values()) {
            size += coordinates.size();
        }
        for (final Set coordinates : reportingTaskNames.values()) {
            size += coordinates.size();
        }
        for (final Set coordinates : flowAnalysisRuleNames.values()) {
            size += coordinates.size();
        }
        for (final Set coordinates : parameterProviderNames.values()) {
            size += coordinates.size();
        }
        for (final Set coordinates : flowRegistryClientNames.values()) {
            size += coordinates.size();
        }

        return size;
    }

    public boolean isEmpty() {
        return processorNames.isEmpty()
                && controllerServiceNames.isEmpty()
                && reportingTaskNames.isEmpty()
                && flowAnalysisRuleNames.isEmpty()
                && parameterProviderNames.isEmpty()
                && flowRegistryClientNames.isEmpty();
    }
}