/**
    * Copyright 2011-2014 The Kuali Foundation Licensed under the
    * Educational Community 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.osedu.org/licenses/ECL-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.kuali.mobility.writer.controllers;
  
  import org.apache.commons.io.IOUtils;
  import org.kuali.mobility.writer.entity.Media;
  import org.kuali.mobility.writer.service.WriterService;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.stereotype.Controller;
  import org.springframework.ui.Model;
  import org.springframework.web.bind.annotation.*;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  
  /**
   * Controller for Writer media
   *
   * @author Kuali Mobility Team (mobility.collab@kuali.org)
   * @since 3.1
   */
  @Controller 
  @RequestMapping("/writer/{instance}/media")
  public class WriterMediaController {
  
  	/**
  	 * Reference to the WriterService
  	 */
  	@Autowired
      @Qualifier("writerService")
  	private WriterService service;
  	
  
  	@RequestMapping(value = "/{mediaId}", method = RequestMethod.GET)
  	public void getMedia(
  			@PathVariable int mediaId,
  			@RequestParam(value="thumb", required=false, defaultValue="false") boolean thumb,
  			HttpServletRequest request,
  			HttpServletResponse response) throws IOException {
  		
  		long dateChanged = request.getDateHeader("If-Modified-Since") / 1000;
  		
  		File mediaFile = service.getMediaFile(mediaId, thumb);
  		long mediaChanged = mediaFile.lastModified() / 1000;
  		if (dateChanged == mediaChanged){
  			response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
  			return;
  		}
  		Media media = service.getMedia(mediaId);
  		response.setContentType(media.getMimeType());
  		response.setDateHeader("Last-Modified", mediaFile.lastModified());
  		
  		int bytesWritten = IOUtils.copy(new FileInputStream(mediaFile), response.getOutputStream());
  		response.setContentLength(bytesWritten);
  		
  	}
  
  	/**
  	 * Controller to view an article's image
  	 */
  	@RequestMapping(value = "/view/{mediaId}", method = RequestMethod.GET)
  	public String viewImage(
  			@PathVariable(value="mediaId") long mediaId,
  			@PathVariable("instance") String instance,
  			Model uiModel) {
  		
  		// add to uiModel
  		uiModel.addAttribute("mediaId", mediaId);
  		uiModel.addAttribute("toolInstance", instance);
  		return "writer/viewImage";
  	}
  	
  }