/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you 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 io.netty.handler.codec.http.multipart;
  
  import io.netty.buffer.ByteBuf;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.Charset;
  
  /**
   * Mixed implementation using both in Memory and in File with a limit of size
   */
  public class MixedFileUpload implements FileUpload {
  
      private FileUpload fileUpload;
  
      private final long limitSize;
  
      private final long definedSize;
      private long maxSize = DefaultHttpDataFactory.MAXSIZE;
  
      public MixedFileUpload(String name, String filename, String contentType,
              String contentTransferEncoding, Charset charset, long size,
              long limitSize) {
          this.limitSize = limitSize;
          if (size > this.limitSize) {
              fileUpload = new DiskFileUpload(name, filename, contentType,
                      contentTransferEncoding, charset, size);
          } else {
              fileUpload = new MemoryFileUpload(name, filename, contentType,
                      contentTransferEncoding, charset, size);
          }
          definedSize = size;
      }
  
      @Override
      public long getMaxSize() {
          return maxSize;
      }
  
      @Override
      public void setMaxSize(long maxSize) {
          this.maxSize = maxSize;
          fileUpload.setMaxSize(maxSize);
      }
  
      @Override
      public void checkSize(long newSize) throws IOException {
          if (maxSize >= 0 && newSize > maxSize) {
              throw new IOException("Size exceed allowed maximum capacity");
          }
      }
  
      @Override
      public void addContent(ByteBuf buffer, boolean last)
              throws IOException {
          if (fileUpload instanceof MemoryFileUpload) {
              checkSize(fileUpload.length() + buffer.readableBytes());
              if (fileUpload.length() + buffer.readableBytes() > limitSize) {
                  DiskFileUpload diskFileUpload = new DiskFileUpload(fileUpload
                          .getName(), fileUpload.getFilename(), fileUpload
                          .getContentType(), fileUpload
                          .getContentTransferEncoding(), fileUpload.getCharset(),
                          definedSize);
                  diskFileUpload.setMaxSize(maxSize);
                  ByteBuf data = fileUpload.getByteBuf();
                  if (data != null && data.isReadable()) {
                      diskFileUpload.addContent(data.retain(), false);
                  }
                  // release old upload
                  fileUpload.release();
  
                  fileUpload = diskFileUpload;
              }
          }
          fileUpload.addContent(buffer, last);
      }
  
      @Override
      public void delete() {
          fileUpload.delete();
      }
  
      @Override
     public byte[] get() throws IOException {
         return fileUpload.get();
     }
 
     @Override
     public ByteBuf getByteBuf() throws IOException {
         return fileUpload.getByteBuf();
     }
 
     @Override
     public Charset getCharset() {
         return fileUpload.getCharset();
     }
 
     @Override
     public String getContentType() {
         return fileUpload.getContentType();
     }
 
     @Override
     public String getContentTransferEncoding() {
         return fileUpload.getContentTransferEncoding();
     }
 
     @Override
     public String getFilename() {
         return fileUpload.getFilename();
     }
 
     @Override
     public String getString() throws IOException {
         return fileUpload.getString();
     }
 
     @Override
     public String getString(Charset encoding) throws IOException {
         return fileUpload.getString(encoding);
     }
 
     @Override
     public boolean isCompleted() {
         return fileUpload.isCompleted();
     }
 
     @Override
     public boolean isInMemory() {
         return fileUpload.isInMemory();
     }
 
     @Override
     public long length() {
         return fileUpload.length();
     }
 
     @Override
     public long definedLength() {
         return fileUpload.definedLength();
     }
 
     @Override
     public boolean renameTo(File dest) throws IOException {
         return fileUpload.renameTo(dest);
     }
 
     @Override
     public void setCharset(Charset charset) {
         fileUpload.setCharset(charset);
     }
 
     @Override
     public void setContent(ByteBuf buffer) throws IOException {
         checkSize(buffer.readableBytes());
         if (buffer.readableBytes() > limitSize) {
             if (fileUpload instanceof MemoryFileUpload) {
                 FileUpload memoryUpload = fileUpload;
                 // change to Disk
                 fileUpload = new DiskFileUpload(memoryUpload
                         .getName(), memoryUpload.getFilename(), memoryUpload
                         .getContentType(), memoryUpload
                         .getContentTransferEncoding(), memoryUpload.getCharset(),
                         definedSize);
                 fileUpload.setMaxSize(maxSize);
 
                 // release old upload
                 memoryUpload.release();
             }
         }
         fileUpload.setContent(buffer);
     }
 
     @Override
     public void setContent(File file) throws IOException {
         checkSize(file.length());
         if (file.length() > limitSize) {
             if (fileUpload instanceof MemoryFileUpload) {
                 FileUpload memoryUpload = fileUpload;
 
                 // change to Disk
                 fileUpload = new DiskFileUpload(memoryUpload
                         .getName(), memoryUpload.getFilename(), memoryUpload
                         .getContentType(), memoryUpload
                         .getContentTransferEncoding(), memoryUpload.getCharset(),
                         definedSize);
                 fileUpload.setMaxSize(maxSize);
 
                 // release old upload
                 memoryUpload.release();
             }
         }
         fileUpload.setContent(file);
     }
 
     @Override
     public void setContent(InputStream inputStream) throws IOException {
         if (fileUpload instanceof MemoryFileUpload) {
             FileUpload memoryUpload = fileUpload;
 
             // change to Disk
             fileUpload = new DiskFileUpload(fileUpload
                     .getName(), fileUpload.getFilename(), fileUpload
                     .getContentType(), fileUpload
                     .getContentTransferEncoding(), fileUpload.getCharset(),
                     definedSize);
             fileUpload.setMaxSize(maxSize);
 
             // release old upload
             memoryUpload.release();
         }
         fileUpload.setContent(inputStream);
     }
 
     @Override
     public void setContentType(String contentType) {
         fileUpload.setContentType(contentType);
     }
 
     @Override
     public void setContentTransferEncoding(String contentTransferEncoding) {
         fileUpload.setContentTransferEncoding(contentTransferEncoding);
     }
 
     @Override
     public void setFilename(String filename) {
         fileUpload.setFilename(filename);
     }
 
     @Override
     public HttpDataType getHttpDataType() {
         return fileUpload.getHttpDataType();
     }
 
     @Override
     public String getName() {
         return fileUpload.getName();
     }
 
     @Override
     public int hashCode() {
         return fileUpload.hashCode();
     }
 
     @Override
     public boolean equals(Object obj) {
         return fileUpload.equals(obj);
     }
 
     @Override
     public int compareTo(InterfaceHttpData o) {
         return fileUpload.compareTo(o);
     }
 
     @Override
     public String toString() {
         return "Mixed: " + fileUpload;
     }
 
     @Override
     public ByteBuf getChunk(int length) throws IOException {
         return fileUpload.getChunk(length);
     }
 
     @Override
     public File getFile() throws IOException {
         return fileUpload.getFile();
     }
 
     @Override
     public FileUpload copy() {
         return fileUpload.copy();
     }
 
     @Override
     public FileUpload duplicate() {
         return fileUpload.duplicate();
     }
 
     @Override
     public FileUpload retainedDuplicate() {
         return fileUpload.retainedDuplicate();
     }
 
     @Override
     public FileUpload replace(ByteBuf content) {
         return fileUpload.replace(content);
     }
 
     @Override
     public ByteBuf content() {
         return fileUpload.content();
     }
 
     @Override
     public int refCnt() {
         return fileUpload.refCnt();
     }
 
     @Override
     public FileUpload retain() {
         fileUpload.retain();
         return this;
     }
 
     @Override
     public FileUpload retain(int increment) {
         fileUpload.retain(increment);
         return this;
     }
 
     @Override
     public FileUpload touch() {
         fileUpload.touch();
         return this;
     }
 
     @Override
     public FileUpload touch(Object hint) {
         fileUpload.touch(hint);
         return this;
     }
 
     @Override
     public boolean release() {
         return fileUpload.release();
     }
 
     @Override
     public boolean release(int decrement) {
         return fileUpload.release(decrement);
     }
 }