/*
 * 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.api.plugins.internal;

import org.gradle.api.Project;
import org.gradle.api.artifacts.Configuration;
import org.gradle.api.file.FileCollection;
import org.gradle.api.file.SourceDirectorySet;
import org.gradle.api.internal.plugins.DslObject;
import org.gradle.api.internal.tasks.DefaultSourceSetOutput;
import org.gradle.api.internal.tasks.compile.processing.DefaultProcessorPath;
import org.gradle.api.tasks.SourceSet;
import org.gradle.api.tasks.compile.AbstractCompile;
import org.gradle.api.tasks.compile.CompileOptions;
import org.gradle.internal.Cast;

import java.io.File;
import java.util.concurrent.Callable;

public class SourceSetUtil {
    private SourceSetUtil() {}

    public static void configureForSourceSet(final SourceSet sourceSet, final SourceDirectorySet sourceDirectorySet, AbstractCompile compile, final Project target) {
        compile.setDescription("Compiles the " + sourceDirectorySet.getDisplayName() + ".");
        compile.setSource(sourceSet.getJava());
        compile.getConventionMapping().map("classpath", new Callable<Object>() {
            public Object call() throws Exception {
                return sourceSet.getCompileClasspath().plus(target.files(sourceSet.getJava().getOutputDir()));
            }
        });
        compile.setDestinationDir(target.provider(new Callable<File>() {
            @Override
            public File call() throws Exception {
                return sourceDirectorySet.getOutputDir();
            }
        }));
    }

    public static void configureForSourceSet(final SourceSet sourceSet, final SourceDirectorySet sourceDirectorySet, AbstractCompile compile, CompileOptions options, final Project target) {
        configureForSourceSet(sourceSet, sourceDirectorySet, compile, target);
        configureAnnotationProcessorPath(sourceSet, options, target);
    }

    public static void configureAnnotationProcessorPath(final SourceSet sourceSet, CompileOptions options, final Project target) {
        new DslObject(options).getConventionMapping().map("annotationProcessorPath", new Callable<Object>() {
            @Override
            public Object call() throws Exception {
                FileCollection processorPath = sourceSet.getAnnotationProcessorPath();
                if (processorPath == target.getConfigurations().getByName(sourceSet.getAnnotationProcessorConfigurationName())) {
                    return new DefaultProcessorPath((Configuration) processorPath);
                } else {
                    return processorPath;
                }
            }
        });
    }

    public static void configureOutputDirectoryForSourceSet(final SourceSet sourceSet, final SourceDirectorySet sourceDirectorySet, final Project target) {
        final String sourceSetChildPath = "classes/" + sourceDirectorySet.getName() + "/" + sourceSet.getName();
        sourceDirectorySet.setOutputDir(target.provider(new Callable<File>() {
            @Override
            public File call() throws Exception {
                if (sourceSet.getOutput().isLegacyLayout()) {
                    return sourceSet.getOutput().getClassesDir();
                }
                return new File(target.getBuildDir(), sourceSetChildPath);
            }
        }));

        DefaultSourceSetOutput sourceSetOutput = Cast.cast(DefaultSourceSetOutput.class, sourceSet.getOutput());
        sourceSetOutput.addClassesDir(new Callable<File>() {
            @Override
            public File call() throws Exception {
                return sourceDirectorySet.getOutputDir();
            }
        });
    }
}
