/**
 * This file is part of the Meeds project (https://meeds.io/).
 *
 * Copyright (C) 2020 - 2025 Meeds Association contact@meeds.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.exoplatform.social.core.model;

import java.io.IOException;
import java.io.InputStream;

import org.exoplatform.commons.utils.IOUtil;

public abstract class Attachment {
  private static final int KB_SIZE = 1024;

  private static final int MB_SIZE = 1024 * KB_SIZE;

  private String           id;

  private String           fileName;

  private String           mimeType;

  private byte[]           imageBytes;

  private long             lastModified;

  protected Attachment() {
  }

  protected Attachment(String id,
                       String fileName,
                       String mimeType,
                       InputStream inputStream,
                       long lastModified)
      throws IOException {
    this.id = id;
    this.fileName = fileName;
    this.mimeType = mimeType;
    this.lastModified = lastModified;
    setInputStream(inputStream);
  }

  public abstract String getAttachmentType();

  /**
   * Gets the id.
   *
   * @return the id
   */
  public String getId() {
    return id;
  }

  /**
   * Sets the id.
   *
   * @param s the new id
   */
  public void setId(String s) {
    id = s;
  }

  /**
   * Gets the file name.
   *
   * @return the file name
   */
  public String getFileName() {
    return fileName;
  }

  /**
   * Sets the file name.
   *
   * @param s the new file name
   */
  public void setFileName(String s) {
    fileName = s;
  }

  /**
   * Gets the mime type.
   *
   * @return the mime type
   */
  public String getMimeType() {
    return mimeType;
  }

  /**
   * Sets the mime type.
   *
   * @param s the new mime type
   */
  public void setMimeType(String s) {
    mimeType = s;
  }

  /**
   * Gets the last modified.
   *
   * @return the last modified
   */
  public long getLastModified() {
    return lastModified;
  }

  /**
   * Sets the last modified.
   *
   * @param lastModified the new last modified
   */
  public void setLastModified(long lastModified) {
    this.lastModified = lastModified;
  }

  /**
   * Gets images size in MB/ KB/ Bytes.
   *
   * @return image size string
   */
  public String getSize() {
    int length = imageBytes.length;
    double size;
    if (length >= MB_SIZE) {
      size = ((double) length) / MB_SIZE;
      return size + " MB";
    } else if (length >= KB_SIZE) {
      size = ((double) length) / KB_SIZE;
      return size + " KB";
    } else { // Bytes size
      return length + " Bytes";
    }
  }

  public byte[] getImageBytes() {
    return imageBytes;
  }

  /**
   * Read image bytes from input stream
   *
   * @param input the new input stream
   * @throws IOException the exception
   */
  public void setInputStream(InputStream input) throws IOException {
    if (input != null) {
      imageBytes = IOUtil.getStreamContentAsBytes(input);
    } else {
      imageBytes = null;
    }
  }

}
