/*
 * 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.platform.base.binary;

import org.gradle.api.Action;
import org.gradle.api.DomainObjectSet;
import org.gradle.api.Incubating;
import org.gradle.api.PolymorphicDomainObjectContainer;
import org.gradle.api.internal.AbstractBuildableModelElement;
import org.gradle.api.internal.project.taskfactory.ITaskFactory;
import org.gradle.internal.reflect.Instantiator;
import org.gradle.internal.reflect.ObjectInstantiationException;
import org.gradle.language.base.FunctionalSourceSet;
import org.gradle.language.base.LanguageSourceSet;
import org.gradle.language.base.internal.LanguageSourceSetContainer;
import org.gradle.platform.base.BinaryTasksCollection;
import org.gradle.platform.base.ModelInstantiationException;
import org.gradle.platform.base.internal.BinaryBuildAbility;
import org.gradle.platform.base.internal.BinarySpecInternal;
import org.gradle.platform.base.internal.DefaultBinaryTasksCollection;
import org.gradle.platform.base.internal.FixedBuildAbility;

/**
 * Base class for custom binary implementations. A custom implementation of
 * {@link org.gradle.platform.base.BinarySpec} must extend this type.
 *
 * TODO at the moment leaking BinarySpecInternal here to generate lifecycleTask
 * in LanguageBasePlugin$createLifecycleTaskForBinary#
 * createLifecycleTaskForBinary rule
 *
 */
@Incubating
public abstract class BaseBinarySpec extends AbstractBuildableModelElement
		implements BinarySpecInternal {
	private final LanguageSourceSetContainer sourceSets = new LanguageSourceSetContainer();

	private static ThreadLocal<BinaryInfo> nextBinaryInfo = new ThreadLocal<BinaryInfo>();
	private final BinaryTasksCollection tasks;

	private final String name;
	private final String typeName;

	private boolean disabled;

	public static <T extends BaseBinarySpec> T create(Class<T> type,
			String name, Instantiator instantiator, ITaskFactory taskFactory) {
		if (type.equals(BaseBinarySpec.class)) {
			throw new ModelInstantiationException(
					"Cannot create instance of abstract class BaseBinarySpec.");
		}
		nextBinaryInfo.set(new BinaryInfo(name, type.getSimpleName(),
				taskFactory, instantiator));
		try {
			try {
				return instantiator.newInstance(type);
			} catch (ObjectInstantiationException e) {
				throw new ModelInstantiationException(String.format(
						"Could not create binary of type %s",
						type.getSimpleName()), e.getCause());
			}
		} finally {
			nextBinaryInfo.set(null);
		}
	}

	protected BaseBinarySpec() {
		this(nextBinaryInfo.get());
	}

	private BaseBinarySpec(BinaryInfo info) {
		if (info == null) {
			throw new ModelInstantiationException(
					"Direct instantiation of a BaseBinarySpec is not permitted. Use a BinaryTypeBuilder instead.");
		}
		this.name = info.name;
		this.typeName = info.typeName;
		this.tasks = info.instantiator.newInstance(
				DefaultBinaryTasksCollection.class, this, info.taskFactory);
	}

	protected String getTypeName() {
		return typeName;
	}

	public String getDisplayName() {
		return String.format("%s '%s'", getTypeName(), getName());
	}

	public String getName() {
		return name;
	}

	@Override
	public void setBuildable(boolean buildable) {
		this.disabled = !buildable;
	}

	public final boolean isBuildable() {
		return getBuildAbility().isBuildable();
	}

	public FunctionalSourceSet getBinarySources() {
		return sourceSets.getMainSources();
	}

	public void setBinarySources(FunctionalSourceSet sources) {
		sourceSets.setMainSources(sources);
	}

	public DomainObjectSet<LanguageSourceSet> getSource() {
		return sourceSets.getSources();
	}

	public void sources(
			Action<? super PolymorphicDomainObjectContainer<LanguageSourceSet>> action) {
		action.execute(sourceSets.getMainSources());
	}

	// TODO:DAZ Remove this
	public void source(Object source) {
		sourceSets.source(source);
	}

	public BinaryTasksCollection getTasks() {
		return tasks;
	}

	@Override
	public void tasks(Action<? super BinaryTasksCollection> action) {
		action.execute(tasks);
	}

	public boolean isLegacyBinary() {
		return false;
	}

	private static class BinaryInfo {
		private final String name;
		private final String typeName;
		private final ITaskFactory taskFactory;
		private final Instantiator instantiator;

		private BinaryInfo(String name, String typeName,
				ITaskFactory taskFactory, Instantiator instantiator) {
			this.name = name;
			this.typeName = typeName;
			this.taskFactory = taskFactory;
			this.instantiator = instantiator;
		}
	}

	@Override
	public String toString() {
		return getDisplayName();
	}

	@Override
	public final BinaryBuildAbility getBuildAbility() {
		if (disabled) {
			return new FixedBuildAbility(false);
		}
		return getBinaryBuildAbility();
	}

	protected BinaryBuildAbility getBinaryBuildAbility() {
		// Default behavior is to always be buildable. Binary implementations
		// should define what
		// criteria make them buildable or not.
		return new FixedBuildAbility(true);
	}
}
