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/*
 * Copyright 2000-2024 Vaadin Ltd.
 *
 * 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.vaadin.flow.component.upload.receivers;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import com.vaadin.flow.component.upload.MultiFileReceiver;

/**
 * Basic multi file in memory file receiver implementation.
 */
public class MultiFileMemoryBuffer implements MultiFileReceiver {

    private Map files = new HashMap<>();

    @Override
    public OutputStream receiveUpload(String fileName, String MIMEType) {
        ByteArrayOutputStream outputBuffer = new ByteArrayOutputStream();
        files.put(fileName, new FileData(fileName, MIMEType, outputBuffer));

        return outputBuffer;
    }

    /**
     * Get the files in memory for this buffer.
     *
     * @return files in memory
     */
    public Set getFiles() {
        return files.keySet();
    }

    /**
     * Get file data for upload with file name.
     *
     * @param fileName
     *            file name to get upload data for
     * @return file data for filename or null if not found
     */
    public FileData getFileData(String fileName) {
        return files.get(fileName);
    }

    /**
     * Get the output stream for file.
     *
     * @param fileName
     *            name of file to get stream for
     * @return file output stream or empty stream if no file found
     */
    public ByteArrayOutputStream getOutputBuffer(String fileName) {
        if (files.containsKey(fileName)) {
            return (ByteArrayOutputStream) files.get(fileName)
                    .getOutputBuffer();
        }
        return new ByteArrayOutputStream();
    }

    /**
     * Get the input stream for file with filename.
     *
     * @param filename
     *            name of file to get input stream for
     * @return input stream for file or empty stream if file not found
     */
    public InputStream getInputStream(String filename) {
        if (files.containsKey(filename)) {
            return new ByteArrayInputStream(((ByteArrayOutputStream) files
                    .get(filename).getOutputBuffer()).toByteArray());
        }
        return new ByteArrayInputStream(new byte[0]);
    }
}