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/*
 * Copyright 2016-2023 DiffPlug
 *
 * 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 com.diffplug.gradle.spotless;

import javax.inject.Inject;

import org.gradle.api.GradleException;
import org.gradle.api.internal.plugins.DslObject;
import org.gradle.api.plugins.GroovyBasePlugin;
import org.gradle.api.tasks.GroovySourceDirectorySet;
import org.gradle.api.tasks.GroovySourceSet;
import org.gradle.util.GradleVersion;

import com.diffplug.spotless.generic.LicenseHeaderStep;

public class GroovyExtension extends BaseGroovyExtension implements HasBuiltinDelimiterForLicense, JvmLang {
	private boolean excludeJava = false;
	static final String NAME = "groovy";

	@Inject
	public GroovyExtension(SpotlessExtension spotless) {
		super(spotless);
	}

	/** Excludes .java files, to focus on only .groovy files. */
	public void excludeJava() {
		excludeJava(true);
	}

	/** Determines whether to exclude .java files, to focus on only .groovy files. */
	public void excludeJava(boolean excludeJava) {
		this.excludeJava = excludeJava;
	}

	@Override
	public LicenseHeaderConfig licenseHeader(String licenseHeader) {
		return licenseHeader(licenseHeader, JavaExtension.LICENSE_HEADER_DELIMITER);
	}

	@Override
	public LicenseHeaderConfig licenseHeaderFile(Object licenseHeaderFile) {
		return licenseHeaderFile(licenseHeaderFile, JavaExtension.LICENSE_HEADER_DELIMITER);
	}

	/** If the user hasn't specified the files yet, we'll assume he/she means all of the groovy files. */
	@Override
	protected void setupTask(SpotlessTask task) {
		if (target == null) {
			final String message = "You must either specify 'target' manually or apply the 'groovy' plugin.";
			if (!getProject().getPlugins().hasPlugin(GroovyBasePlugin.class)) {
				throw new GradleException(message);
			}
			target = getSources(getProject(),
					message,
					sourceSet -> {
						if (GradleVersion.current().compareTo(GradleVersion.version(SpotlessPlugin.VER_GRADLE_javaPluginExtension)) >= 0) {
							return sourceSet.getExtensions().getByType(GroovySourceDirectorySet.class);
						} else {
							final GroovySourceSet groovySourceSet = new DslObject(sourceSet).getConvention().getPlugin(GroovySourceSet.class);
							return groovySourceSet.getGroovy();
						}
					},
					file -> {
						final String name = file.getName();
						if (excludeJava) {
							return name.endsWith(".groovy");
						} else {
							return name.endsWith(".groovy") || name.endsWith(".java");
						}
					});
		} else if (excludeJava) {
			throw new IllegalArgumentException("'excludeJava' is not supported in combination with a custom 'target'.");
		}
		// LicenseHeaderStep completely blows apart package-info.java/groovy - this common-sense check
		// ensures that it skips both. See https://github.com/diffplug/spotless/issues/1
		steps.replaceAll(step -> {
			if (isLicenseHeaderStep(step)) {
				return step.filterByFile(LicenseHeaderStep.unsupportedJvmFilesFilter());
			} else {
				return step;
			}
		});
		super.setupTask(task);
	}
}