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/*
 * Copyright 2022 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.execution.plan;

import com.google.common.collect.ImmutableSet;

import javax.annotation.Nullable;
import java.util.Set;

/**
 * Represents a group of nodes that are reachable from more than one root node.
 */
public class CompositeNodeGroup extends HasFinalizers {
    private final NodeGroup ordinalGroup;
    private final Set finalizerGroups;
    private final boolean reachableFromEntryPoint;

    public static HasFinalizers mergeInto(OrdinalGroup original, HasFinalizers finalizers) {
        return new CompositeNodeGroup(original.isReachableFromEntryPoint() || finalizers.isReachableFromEntryPoint(), original, finalizers.getFinalizerGroups());
    }

    public static HasFinalizers mergeInto(HasFinalizers original, HasFinalizers finalizers) {
        if (original.isReachableFromEntryPoint() == finalizers.isReachableFromEntryPoint() && original.getFinalizerGroups().containsAll(finalizers.getFinalizerGroups())) {
            return original;
        }
        boolean reachableFromEntryPoint = original.isReachableFromEntryPoint() || finalizers.isReachableFromEntryPoint();
        ImmutableSet.Builder builder = ImmutableSet.builder();
        builder.addAll(original.getFinalizerGroups());
        builder.addAll(finalizers.getFinalizerGroups());
        return new CompositeNodeGroup(reachableFromEntryPoint, original.getOrdinalGroup(), builder.build());
    }

    public CompositeNodeGroup(boolean reachableFromEntryPoint, NodeGroup newOrdinal, Set finalizerGroups) {
        this.ordinalGroup = newOrdinal;
        this.finalizerGroups = finalizerGroups;
        this.reachableFromEntryPoint = reachableFromEntryPoint;
    }

    @Override
    public String toString() {
        return "composite group, entry point: " + isReachableFromEntryPoint() + ", ordinal: " + ordinalGroup + ", groups: " + finalizerGroups;
    }

    @Nullable
    @Override
    public OrdinalGroup asOrdinal() {
        return ordinalGroup.asOrdinal();
    }

    @Override
    public NodeGroup withOrdinalGroup(OrdinalGroup newOrdinal) {
        return new CompositeNodeGroup(reachableFromEntryPoint, newOrdinal, finalizerGroups);
    }

    @Override
    public NodeGroup reachableFrom(OrdinalGroup newOrdinal) {
        return new CompositeNodeGroup(reachableFromEntryPoint || newOrdinal.isReachableFromEntryPoint(), newOrdinal, finalizerGroups);
    }

    @Override
    public NodeGroup getOrdinalGroup() {
        return ordinalGroup;
    }

    @Override
    public boolean isReachableFromEntryPoint() {
        return reachableFromEntryPoint;
    }

    @Override
    public void addMember(Node node) {
        for (FinalizerGroup group : finalizerGroups) {
            group.addMember(node);
        }
    }

    @Override
    public void removeMember(Node node) {
        for (FinalizerGroup group : finalizerGroups) {
            group.removeMember(node);
        }
    }

    @Override
    public Set getFinalizerGroups() {
        return finalizerGroups;
    }

    @Override
    public boolean isCanCancel() {
        return isCanCancel(finalizerGroups);
    }

    @Override
    public Node.DependenciesState checkSuccessorsCompleteFor(Node node) {
        if (ordinalGroup.isReachableFromEntryPoint()) {
            // Reachable from entry point node, can run at any time
            return Node.DependenciesState.COMPLETE_AND_SUCCESSFUL;
        }
        Node.DependenciesState state = Node.DependenciesState.COMPLETE_AND_CAN_SKIP;
        for (FinalizerGroup group : finalizerGroups) {
            Node.DependenciesState groupState = group.checkSuccessorsCompleteFor(node);
            // Can run once any of the finalizer groups is ready to run
            if (groupState == Node.DependenciesState.COMPLETE_AND_SUCCESSFUL) {
                return Node.DependenciesState.COMPLETE_AND_SUCCESSFUL;
            }
            // Wait for any groups that haven't finished
            if (groupState == Node.DependenciesState.NOT_COMPLETE) {
                state = Node.DependenciesState.NOT_COMPLETE;
            }
        }
        // No finalizer group is ready to run, and either all of them have failed or some are not yet complete
        return state;
    }

}