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/*
 * Copyright 2018 the original author or authors.
 *
 * 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.
 */

package org.gradle.tooling.internal.provider.runner;

import org.gradle.internal.operations.BuildOperationDescriptor;
import org.gradle.internal.operations.BuildOperationListener;
import org.gradle.internal.operations.OperationFinishEvent;
import org.gradle.internal.operations.OperationIdentifier;
import org.gradle.internal.operations.OperationProgressEvent;
import org.gradle.internal.operations.OperationStartEvent;

import javax.annotation.Nullable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;

class BuildOperationParentTracker implements BuildOperationListener {

    private final Map parents = new ConcurrentHashMap<>();

    @Nullable
    OperationIdentifier findClosestMatchingAncestor(OperationIdentifier id, Predicate predicate) {
        if (id == null || predicate.test(id)) {
            return id;
        }
        return findClosestMatchingAncestor(parents.get(id), predicate);
    }

    @Nullable
     T findClosestExistingAncestor(OperationIdentifier id, Function lookupFunction) {
        if (id == null) {
            return null;
        }
        T value = lookupFunction.apply(id);
        if (value != null) {
            return value;
        }
        return findClosestExistingAncestor(parents.get(id), lookupFunction);
    }

    @Override
    public void started(BuildOperationDescriptor buildOperation, OperationStartEvent startEvent) {
        if (buildOperation.getParentId() != null) {
            parents.put(buildOperation.getId(), buildOperation.getParentId());
        }
    }

    @Override
    public void progress(OperationIdentifier operationIdentifier, OperationProgressEvent progressEvent) {
    }

    @Override
    public void finished(BuildOperationDescriptor buildOperation, OperationFinishEvent finishEvent) {
        parents.remove(buildOperation.getId());
    }

}