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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.api.internal.artifacts.transform;

import com.google.common.base.Equivalence;
import com.google.common.collect.ImmutableList;
import org.gradle.api.Action;
import org.gradle.api.internal.DomainObjectContext;
import org.gradle.api.internal.attributes.ImmutableAttributes;
import org.gradle.api.internal.project.ProjectInternal;
import org.gradle.api.internal.tasks.NodeExecutionContext;
import org.gradle.api.internal.tasks.TaskDependencyContainer;
import org.gradle.api.internal.tasks.TaskDependencyResolveContext;
import org.gradle.internal.Try;
import org.gradle.internal.fingerprint.FileCollectionFingerprinterRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;
import java.io.File;

/**
 * A single transformation step.
 *
 * Transforms a subject by invoking a transformer on each of the subjects files.
 */
public class TransformationStep implements Transformation, TaskDependencyContainer {
    private static final Logger LOGGER = LoggerFactory.getLogger(TransformationStep.class);
    public static final Equivalence FOR_SCHEDULING = Equivalence.identity();

    private final Transformer transformer;
    private final TransformerInvocationFactory transformerInvocationFactory;
    private final ProjectInternal owningProject;
    private final FileCollectionFingerprinterRegistry globalFingerprinterRegistry;

    public TransformationStep(Transformer transformer, TransformerInvocationFactory transformerInvocationFactory, DomainObjectContext owner, FileCollectionFingerprinterRegistry globalFingerprinterRegistry) {
        this.transformer = transformer;
        this.transformerInvocationFactory = transformerInvocationFactory;
        this.globalFingerprinterRegistry = globalFingerprinterRegistry;
        this.owningProject = owner.getProject();
    }

    public Transformer getTransformer() {
        return transformer;
    }

    @Nullable
    public ProjectInternal getOwningProject() {
        return owningProject;
    }

    @Override
    public boolean endsWith(Transformation otherTransform) {
        return this == otherTransform;
    }

    @Override
    public int stepsCount() {
        return 1;
    }

    public CacheableInvocation createInvocation(TransformationSubject subjectToTransform, TransformUpstreamDependencies upstreamDependencies, @Nullable NodeExecutionContext context) {
        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("Transforming {} with {}", subjectToTransform.getDisplayName(), transformer.getDisplayName());
        }

        FileCollectionFingerprinterRegistry fingerprinterRegistry = context != null ? context.getService(FileCollectionFingerprinterRegistry.class) : globalFingerprinterRegistry;

        Try resolvedDependencies = upstreamDependencies.computeArtifacts();
        return resolvedDependencies
            .map(dependencies -> {
                ImmutableList inputArtifacts = subjectToTransform.getFiles();
                if (inputArtifacts.isEmpty()) {
                    return CacheableInvocation.cached(Try.successful(subjectToTransform.createSubjectFromResult(ImmutableList.of())));
                } else if (inputArtifacts.size() > 1) {
                    return CacheableInvocation.nonCached(() ->
                        doTransform(subjectToTransform, fingerprinterRegistry, dependencies, inputArtifacts)
                    );
                } else {
                    File inputArtifact = inputArtifacts.get(0);
                    return transformerInvocationFactory.createInvocation(transformer, inputArtifact, dependencies, subjectToTransform, fingerprinterRegistry)
                        .map(subjectToTransform::createSubjectFromResult);
                }
            })
            .getOrMapFailure(failure -> CacheableInvocation.cached(Try.failure(failure)));
    }

    private Try doTransform(TransformationSubject subjectToTransform, FileCollectionFingerprinterRegistry fingerprinterRegistry, ArtifactTransformDependencies dependencies, ImmutableList inputArtifacts) {
        ImmutableList.Builder builder = ImmutableList.builder();
        for (File inputArtifact : inputArtifacts) {
            Try> result = transformerInvocationFactory.createInvocation(transformer, inputArtifact, dependencies, subjectToTransform, fingerprinterRegistry).invoke();

            if (result.getFailure().isPresent()) {
                return Try.failure(result.getFailure().get());
            }
            builder.addAll(result.get());
        }
        return Try.successful(subjectToTransform.createSubjectFromResult(builder.build()));
    }

    public void isolateParametersIfNotAlready() {
        transformer.isolateParametersIfNotAlready();
    }

    @Override
    public boolean requiresDependencies() {
        return transformer.requiresDependencies();
    }

    @Override
    public String getDisplayName() {
        return transformer.getDisplayName();
    }

    @Override
    public void visitTransformationSteps(Action action) {
        action.execute(this);
    }

    public ImmutableAttributes getFromAttributes() {
        return transformer.getFromAttributes();
    }

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

    @Override
    public void visitDependencies(TaskDependencyResolveContext context) {
        transformer.visitDependencies(context);
    }
}