/*
 * Copyright 2014 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.language.base.plugins;

import org.gradle.api.Action;
import org.gradle.api.Incubating;
import org.gradle.api.Plugin;
import org.gradle.api.Project;
import org.gradle.api.Task;
import org.gradle.api.file.FileCollection;
import org.gradle.api.internal.project.ProjectInternal;
import org.gradle.api.internal.project.ProjectState;
import org.gradle.api.internal.project.ProjectStateRegistry;
import org.gradle.api.provider.Provider;
import org.gradle.api.tasks.Delete;
import org.gradle.internal.Factory;
import org.gradle.internal.cleanup.BuildOutputCleanupRegistry;
import org.gradle.language.base.internal.plugins.CleanRule;

import javax.annotation.Nullable;
import java.io.File;
import java.util.concurrent.Callable;

/**
 * <p>A {@link org.gradle.api.Plugin} which defines a basic project lifecycle.</p>
 */
@Incubating
public class LifecycleBasePlugin implements Plugin<ProjectInternal> {
    public static final String CLEAN_TASK_NAME = "clean";
    public static final String ASSEMBLE_TASK_NAME = "assemble";
    public static final String CHECK_TASK_NAME = "check";
    public static final String BUILD_TASK_NAME = "build";
    public static final String BUILD_GROUP = "build";
    public static final String VERIFICATION_GROUP = "verification";

    @Override
    public void apply(final ProjectInternal project) {
        addClean(project);
        addCleanRule(project);
        addAssemble(project);
        addCheck(project);
        addBuild(project);
    }

    private void addClean(final ProjectInternal project) {
        final Callable<File> buildDir = new Callable<File>() {
            public File call() {
                return project.getBuildDir();
            }
        };

        // Register at least the project buildDir as a directory to be deleted.
        final BuildOutputCleanupRegistry buildOutputCleanupRegistry = project.getServices().get(BuildOutputCleanupRegistry.class);
        buildOutputCleanupRegistry.registerOutputs(buildDir);

        final Provider<Delete> clean = project.getTasks().register(CLEAN_TASK_NAME, Delete.class, new Action<Delete>() {
            @Override
            public void execute(final Delete cleanTask) {
                cleanTask.setDescription("Deletes the build directory.");
                cleanTask.setGroup(BUILD_GROUP);
                cleanTask.delete(buildDir);
            }
        });
        buildOutputCleanupRegistry.registerOutputs(new Callable<FileCollection>() {
            @Override
            public FileCollection call() {
                ProjectState projectState = project.getServices().get(ProjectStateRegistry.class).stateFor(project);
                return projectState.withMutableState(new Factory<FileCollection>() {
                    @Nullable
                    @Override
                    public FileCollection create() {
                        return clean.get().getTargetFiles();
                    }
                });
            }
        });
    }

    private void addCleanRule(Project project) {
        project.getTasks().addRule(new CleanRule(project.getTasks()));
    }

    private void addAssemble(ProjectInternal project) {
        project.getTasks().register(ASSEMBLE_TASK_NAME, new Action<Task>() {
            @Override
            public void execute(Task assembleTask) {
                assembleTask.setDescription("Assembles the outputs of this project.");
                assembleTask.setGroup(BUILD_GROUP);
            }
        });
    }

    private void addCheck(ProjectInternal project) {
        project.getTasks().register(CHECK_TASK_NAME, new Action<Task>() {
            @Override
            public void execute(Task checkTask) {
                checkTask.setDescription("Runs all checks.");
                checkTask.setGroup(VERIFICATION_GROUP);
            }
        });
    }

    private void addBuild(final ProjectInternal project) {
        project.getTasks().register(BUILD_TASK_NAME, new Action<Task>() {
            @Override
            public void execute(Task buildTask) {
                buildTask.setDescription("Assembles and tests this project.");
                buildTask.setGroup(BUILD_GROUP);
                buildTask.dependsOn(ASSEMBLE_TASK_NAME);
                buildTask.dependsOn(CHECK_TASK_NAME);
            }
        });
    }
}
