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import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.util.*;


@Controller
public class UploadController {
    static String IMAGE_UPLOAD_DIR_REL_PATH = "uploads";
   
    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
	@ResponseBody
	public Map<String, Object> uploadFile(HttpServletRequest request, @RequestParam("file") MultipartFile file)
	        throws IOException {
	    String ROOT_ABS_PATH = request.getSession().getServletContext().getRealPath("");
	    String UPLOAD_DIR_ABS_PATH = ROOT_ABS_PATH + File.separator + IMAGE_UPLOAD_DIR_REL_PATH;
	
	    makeDirectory(UPLOAD_DIR_ABS_PATH);
	
	    String fileName = file.getOriginalFilename();
	    String ext = "";
		String contentType = file.getContentType();
		if(contentType != null) {
		    ext = "." + contentType.substring(contentType.lastIndexOf('/') + 1);
		} else if (fileName.lastIndexOf('.') > 0) {
		    ext = fileName.substring(fileName.lastIndexOf('.'));
		}
		if (ext.indexOf(".jpeg") > -1) { // jpg가 더많이쓰여서 jpeg는 jpg로 바꿈.변환
		    ext = "jpg";
		}
	    String saveFileName = UUID.randomUUID().toString() + ext;
	    String saveFileAbsPath = UPLOAD_DIR_ABS_PATH + File.separator + saveFileName;
	
	    writeFile(saveFileAbsPath, file.getBytes());
	
	    Map<String, Object> map = new HashMap<String, Object>();
	
	    // 브라우저에서 접근가능한 경로를 uploadPath에 담아서 넘겨줍니다.
	    map.put("uploadPath", "uploads/" + saveFileName);
	
	    return map;
	}

	/**
	 * 파일을 씁니다.
	 */
	private static void writeFile(String path, byte[] bytes) throws IOException {
	    OutputStream os = null;
	    try {
	        os = new FileOutputStream(path);
	        os.write(bytes);
	    } finally {
	        if (os != null) os.close();
	    }
	}
	
	/**
	 * 디렉토리가 없는 경우 디렉토리를 생성합니다.
	 */
	private static void makeDirectory(String dirPath) {
	    File dir = new File(dirPath);
	    if (!dir.exists()) {
	        dir.mkdir();
	    }
	}
}