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/*
 * Copyright 2017 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.initialization;

import com.google.common.collect.ImmutableSortedSet;
import org.gradle.api.Project;
import org.gradle.api.internal.GradleInternal;
import org.gradle.api.internal.SettingsInternal;
import org.gradle.api.internal.project.ProjectInternal;
import org.gradle.internal.operations.BuildOperationContext;
import org.gradle.internal.operations.BuildOperationExecutor;
import org.gradle.internal.operations.CallableBuildOperation;
import org.gradle.internal.progress.BuildOperationDescriptor;

import java.util.Comparator;
import java.util.Set;

public class NotifyingBuildLoader implements BuildLoader {
    private final BuildLoader buildLoader;
    private final BuildOperationExecutor buildOperationExecutor;

    public NotifyingBuildLoader(BuildLoader buildLoader, BuildOperationExecutor buildOperationExecutor) {
        this.buildLoader = buildLoader;
        this.buildOperationExecutor = buildOperationExecutor;
    }

    @Override
    public void load(final SettingsInternal settings, final GradleInternal gradle) {
        try {
            buildOperationExecutor.call(new CallableBuildOperation() {
                @Override
                public BuildOperationDescriptor.Builder description() {
                    return BuildOperationDescriptor.displayName("Load projects").
                        progressDisplayName("loading").
                        details(new BuildStructureOperationDetails());
                }

                @Override
                public Void call(BuildOperationContext context) {
                    buildLoader.load(settings, gradle);
                    context.setResult(createOperationResult(gradle));
                    return null;
                }
            });
        } finally {
            gradle.getBuildListenerBroadcaster().projectsLoaded(gradle);
        }
    }

    private BuildStructureOperationResult createOperationResult(GradleInternal gradle) {
        String buildPath = gradle.getIdentityPath().toString();
        LoadProjectsBuildOperationType.Result.Project rootProject = convert(gradle.getRootProject());
        return new BuildStructureOperationResult(rootProject, buildPath);
    }

    private LoadProjectsBuildOperationType.Result.Project convert(org.gradle.api.Project project) {
        return new BuildStructureOperationProject(
            project.getName(),
            project.getPath(),
            ((ProjectInternal) project).getIdentityPath().toString(),
            project.getProjectDir().getAbsolutePath(),
            project.getBuildFile().getAbsolutePath(),
            convert(project.getChildProjects().values()));
    }

    private Set convert(Iterable children) {
        ImmutableSortedSet.Builder builder = new ImmutableSortedSet.Builder(PROJECT_COMPARATOR);
        for (org.gradle.api.Project child : children) {
            builder.add(convert(child));
        }
        return builder.build();
    }

    private static class BuildStructureOperationDetails implements LoadProjectsBuildOperationType.Details {
    }

    private static class BuildStructureOperationResult implements LoadProjectsBuildOperationType.Result {
        private final Project rootProject;
        private final String buildPath;

        public BuildStructureOperationResult(Project rootProject, String buildPath) {
            this.rootProject = rootProject;
            this.buildPath = buildPath;
        }

        @Override
        public Project getRootProject() {
            return rootProject;
        }

        @Override
        public String getBuildPath() {
            return buildPath;
        }
    }

    private static class BuildStructureOperationProject implements LoadProjectsBuildOperationType.Result.Project {
        private final String name;
        private final String path;
        private final String identityPath;
        private final String projectDir;
        private final String buildFile;
        private final Set children;

        public BuildStructureOperationProject(String name, String path, String identityPath, String projectDir, String buildFile, Set children) {
            this.name = name;
            this.path = path;
            this.identityPath = identityPath;
            this.projectDir = projectDir;
            this.buildFile = buildFile;
            this.children = children;
        }

        @Override
        public String getName() {
            return name;
        }

        @Override
        public String getPath() {
            return path;
        }

        @Override
        public String getIdentityPath() {
            return identityPath;
        }

        @Override
        public String getProjectDir() {
            return projectDir;
        }

        @Override
        public String getBuildFile() {
            return buildFile;
        }

        @Override
        public Set getChildren() {
            return children;
        }
    }

    private static final Comparator PROJECT_COMPARATOR = new Comparator() {
        @Override
        public int compare(LoadProjectsBuildOperationType.Result.Project o1, LoadProjectsBuildOperationType.Result.Project o2) {
            return o1.getName().compareTo(o2.getName());
        }
    };
}