/*
    * Copyright 2004-2006 the Seasar Foundation and the Others.
    *
    * 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.isenshi.util.converter.function;
  
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  
  import org.apache.struts.upload.FormFile;
  import org.seasar.framework.container.factory.SingletonS2ContainerFactory;
  import org.seasar.tuigwaa.database.util.FileData;
  import org.seasar.tuigwaa.database.util.FileDataManager;
  import org.seasar.tuigwaa.model.DataService;
  import org.seasar.tuigwaa.model.common.EntityUtils;
  import org.seasar.tuigwaa.model.core.impl.FileAttribute;
  import org.seasar.tuigwaa.util.TgwNameUtils;
  
  import com.isenshi.util.CharUtil;
  import com.isenshi.util.SimpleFile;
  
  public class FormFile2BytesConverterFunction extends ConverterFunction {
  
  	private DataService dataService = (DataService) SingletonS2ContainerFactory
  			.getContainer().getComponent(DataService.class);
  
  	public Object evaluate(Object obj) {
  		ConverterInfo info = new ConverterInfo(obj);
  
  		String src = getSourceField();
  		String target = getTargetField();
  
  		EntityUtils.setProperty(obj, target, info.getBytes());
  		EntityUtils.setProperty(obj, src, info.getFile());
  
  		return obj;
  	}
  
  	public Properties getExtraProperties() {
  		Properties props = new Properties();
  		props.put(FileAttribute.toFlag(getSourceField()), "java.lang.String");
  		props.put(FileAttribute.toUpdateFile(getSourceField()), FormFile.class
  				.getName());
  		return props;
  	}
  
  	class ConverterInfo {
  
  		Object obj;
  
  		FormFile file;
  
  		byte[] bytes;
  
  		boolean updateFlag;
  
  		boolean noupdateFlag;
  
  		boolean deleteFlag;
  
  		boolean newFlag;
  
  		String entityId;
  		
  		String entityName = getEntity().getName(); 
  		
  		String attrName = TgwNameUtils
  		.toPropertyName(getTargetField());
  		
  		ConverterInfo(Object obj) {
  			this.obj = obj;
  			parseFlag();
  			parseFile();
  		}
  
  		public byte[] getBytes() {
  			return bytes;
  		}
  
  		public FormFile getFile() {
  			return file;
  		}
  
  		void parseFlag() {
  			String flag = FileAttribute.toFlag(getSourceField());
  			flag = (String) EntityUtils.getProperty(obj, flag);
 			updateFlag = FileAttribute.FLAG_UPDATE.equals(flag);
 			noupdateFlag = FileAttribute.FLAG_NOUPDATE.equals(flag);
 			deleteFlag = FileAttribute.FLAG_DELETE.equals(flag);
 			newFlag = !(noupdateFlag || updateFlag || deleteFlag);
 		}
 
 		void parseFile() {
 			 Long id = EntityUtils.getEscapedId(obj);
 			 entityId = "";
 			 if(id != null){
 				 entityId = "" + id;
 			 }
 			if (newFlag) {
 				parseFile(getSourceField());
 			} else if (updateFlag) {
 				parseFile(FileAttribute.toUpdateFile(getSourceField()));
 			} else if (noupdateFlag) {
 				loadFile(obj);
 			} else if(deleteFlag){
 				FileDataManager.addFileData(new FileData(entityName, attrName, entityId, null));
 			}
 		}
 
 		void loadFile(Object obj) {
 			Long id = EntityUtils.getEscapedId(obj);
 			Object savedObj = dataService.load(getEntity(), id);
 			bytes = (byte[]) EntityUtils.getProperty(savedObj, TgwNameUtils
 					.removeEscapeCharacters(getTargetField()));
 			SimpleFile sfile = (SimpleFile) CharUtil.toObject(bytes);
 			file = new VirtualFormFile(sfile);
 		}
 
 		void parseFile(String src) {
 			file = (FormFile) EntityUtils.getProperty(obj, src);
 			if (file != null) {
 				try {
 					byte[] data = file.getFileData();
 					String contentType = file.getContentType();
 					String fileName = file.getFileName();
 					SimpleFile simpleFile = new SimpleFile(contentType,
 							fileName, null);
 					bytes = CharUtil.toBytes(simpleFile);
 					FileDataManager.addFileData(new FileData(entityName,
 							attrName, entityId, data));
 				} catch (FileNotFoundException e) {
 					// do nothing
 				} catch (IOException e) {
 					// do nothing
 				}
 			}
 		}
 	}
 
 	class VirtualFormFile implements FormFile {
 
 		private SimpleFile file;
 
 		public VirtualFormFile(SimpleFile file) {
 			this.file = file;
 		}
 
 		public String getFileName() {
 			return file.getFileName();
 		}
 
 		public String getContentType() {
 			return file.getContentType();
 		}
 
 		public int getFileSize() {
 			return 1;
 		//return file.getData().length();
 		}
 
 		public byte[] getFileData() throws FileNotFoundException, IOException {
 			return file.getData();
 		}
 
 		public void setContentType(String contentType) {
 		}
 
 		public void setFileSize(int fileSize) {
 		}
 
 		public void setFileName(String fileName) {
 		}
 
 		public InputStream getInputStream() throws FileNotFoundException,
 				IOException {
 			return null;
 		}
 
 		public void destroy() {
 		}
 	}
 }