/*
 * Copyright 2010 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.archive;

import org.apache.tools.zip.UnixStat;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;
import org.gradle.api.Action;
import org.gradle.api.GradleException;
import org.gradle.api.file.FileCopyDetails;
import org.gradle.internal.IoActions;
import org.gradle.api.internal.file.CopyActionProcessingStreamAction;
import org.gradle.api.internal.file.copy.CopyAction;
import org.gradle.api.internal.file.copy.CopyActionProcessingStream;
import org.gradle.api.internal.file.copy.FileCopyDetailsInternal;
import org.gradle.api.internal.file.copy.ZipCompressor;
import org.gradle.api.internal.tasks.SimpleWorkResult;
import org.gradle.api.tasks.WorkResult;

import java.io.File;

public class ZipCopyAction implements CopyAction {
    private final File zipFile;
    private final ZipCompressor compressor;

    public ZipCopyAction(File zipFile, ZipCompressor compressor) {
        this.zipFile = zipFile;
        this.compressor = compressor;
    }

    public WorkResult execute(final CopyActionProcessingStream stream) {
        final ZipOutputStream zipOutStr;

        try {
            zipOutStr = compressor.createArchiveOutputStream(zipFile);
        } catch (Exception e) {
            throw new GradleException(String.format("Could not create ZIP '%s'.", zipFile), e);
        }

        IoActions.withResource(zipOutStr, new Action<ZipOutputStream>() {
            public void execute(ZipOutputStream outputStream) {
                stream.process(new StreamAction(outputStream));
            }
        });

        return new SimpleWorkResult(true);
    }

    private class StreamAction implements CopyActionProcessingStreamAction {
        private final ZipOutputStream zipOutStr;

        public StreamAction(ZipOutputStream zipOutStr) {
            this.zipOutStr = zipOutStr;
        }

        public void processFile(FileCopyDetailsInternal details) {
            if (details.isDirectory()) {
                visitDir(details);
            } else {
                visitFile(details);
            }
        }

        private void visitFile(FileCopyDetails fileDetails) {
            try {
                ZipEntry archiveEntry = new ZipEntry(fileDetails.getRelativePath().getPathString());
                archiveEntry.setTime(fileDetails.getLastModified());
                archiveEntry.setUnixMode(UnixStat.FILE_FLAG | fileDetails.getMode());
                zipOutStr.putNextEntry(archiveEntry);
                fileDetails.copyTo(zipOutStr);
                zipOutStr.closeEntry();
            } catch (Exception e) {
                throw new GradleException(String.format("Could not add %s to ZIP '%s'.", fileDetails, zipFile), e);
            }
        }

        private void visitDir(FileCopyDetails dirDetails) {
            try {
                // Trailing slash in name indicates that entry is a directory
                ZipEntry archiveEntry = new ZipEntry(dirDetails.getRelativePath().getPathString() + '/');
                archiveEntry.setTime(dirDetails.getLastModified());
                archiveEntry.setUnixMode(UnixStat.DIR_FLAG | dirDetails.getMode());
                zipOutStr.putNextEntry(archiveEntry);
                zipOutStr.closeEntry();
            } catch (Exception e) {
                throw new GradleException(String.format("Could not add %s to ZIP '%s'.", dirDetails, zipFile), e);
            }
        }
    }
}
