/*
 * Copyright 2013 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.file.copy;

import org.gradle.api.file.DuplicateFileCopyingException;
import org.gradle.api.file.DuplicatesStrategy;
import org.gradle.api.file.RelativePath;
import org.gradle.api.tasks.WorkResult;
import org.gradle.util.DeprecationLogger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashSet;
import java.util.Set;

public class DuplicateHandlingCopyActionDecorator implements CopyAction {

    private final static Logger LOGGER = LoggerFactory.getLogger(DuplicateHandlingCopyActionDecorator.class);
    private final CopyAction delegate;

    public DuplicateHandlingCopyActionDecorator(CopyAction delegate) {
        this.delegate = delegate;
    }

    @Override
    public WorkResult execute(final CopyActionProcessingStream stream) {
        final Set<RelativePath> visitedFiles = new HashSet<>();

        return delegate.execute(action -> stream.process(details -> {
            if (!details.isDirectory()) {
                DuplicatesStrategy strategy = details.getDuplicatesStrategy();

                if (!visitedFiles.add(details.getRelativePath())) {
                    if (details.isDefaultDuplicatesStrategy()) {
                        DeprecationLogger.nagUserWithDeprecatedIndirectUserCodeCause(
                            "Copying or archiving duplicate paths with the default duplicates strategy",
                            "Explicitly set the duplicates strategy to 'DuplicatesStrategy.INCLUDE' if you want to allow duplicate paths.",
                            "Duplicate path: \"" + details.getRelativePath() + "\".");
                    }
                    if (strategy == DuplicatesStrategy.EXCLUDE) {
                        return;
                    } else if (strategy == DuplicatesStrategy.FAIL) {
                        throw new DuplicateFileCopyingException(String.format("Encountered duplicate path \"%s\" during copy operation configured with DuplicatesStrategy.FAIL", details.getRelativePath()));
                    } else if (strategy == DuplicatesStrategy.WARN) {
                        LOGGER.warn("Encountered duplicate path \"{}\" during copy operation configured with DuplicatesStrategy.WARN", details.getRelativePath());
                    }
                }
            }

            action.processFile(details);
        }));
    }
}
