package froala.editor;

import java.io.IOException;
import java.io.InputStream;
import java.security.NoSuchAlgorithmException;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import egovframework.rte.fdl.cmmn.exception.EgovBizException;
import froala.editor.video.VideoOptions;

/**
 * Video functionality.
 *
 * @author florin@froala.com
 */
public final class Video {
	public static final String multipartContentType = "multipart/form-data";

	/**
	 * Private constructor.
	 */
	private Video() {

	}

	/**
	 * File default options.
	 */
	public static final VideoOptions defaultOptions = new VideoOptions ();

	/**
	 * Uploads a video to disk.
	 *
	 * @param req
	 *           Servlet HTTP request.
	 * @param fileRoute
	 *           Route Server route where the file will be uploaded. This route
	 *           must be public to be accesed by the editor.
	 * @return Object with link.
	 * @throws EgovBizException
	 * @throws IOException
	 * @throws NoSuchAlgorithmException
	 */
	public static EditorFileVO upload (HttpServletRequest req, String fileRoute) throws EgovBizException, NoSuchAlgorithmException, IOException {
		return upload (req, fileRoute, defaultOptions);
	}

	/**
	 * Uploads a video to disk.
	 *
	 * @param req
	 *           Servlet HTTP request.
	 * @param fileRoute
	 *           Server route where the file will be uploaded. This route must be
	 *           public to be accesed by the editor.
	 * @param options
	 *           Video options. Defaults to {@link #defaultOptions} which has
	 *           </br>
	 *           Fieldname: "file" </br>
	 *           Validation:
	 *           <ul>
	 *           <li>Extensions: ".mp4", ".webm", ".ogg"</li>
	 *           <li>Mime Types: "video/mp4", "video/webm", "video/ogg"</li>
	 *           </ul>
	 * @return Object with link.
	 * @throws NoSuchAlgorithmException
	 * @throws EgovBizException
	 * @throws IOException
	 */
	public static EditorFileVO upload (HttpServletRequest req, String fileRoute, VideoOptions options) throws EgovBizException, NoSuchAlgorithmException, IOException {

		if (options == null) {
			options = defaultOptions;
		}

		if (req.getContentType () == null || req.getContentType ().toLowerCase ().indexOf (multipartContentType) == -1) {

			throw new EgovBizException ("Invalid contentType. It must be " + multipartContentType);
		}

		MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest) req;
		MultipartFile file = multipartHttpServletRequest.getFile (options.getFieldname ());

		// servlet 3.0
		//Part filePart = req.getPart(options.getFieldname());

		if (file == null) {
			throw new EgovBizException ("Fieldname is not correct. It must be: " + options.getFieldname ());
		}

		// Generate random name.
		String file_extsn = FilenameUtils.getExtension (Utils.getFileName (file));
		String extension = file_extsn;
		extension = (extension != null && extension != "") ? "." + extension : extension;
		String name = Utils.generateUniqueString () + extension;

		String linkName = fileRoute + name;

		InputStream fileContent = file.getInputStream ();
		String absoluteServerPath = getAbsoluteServerPath (req, linkName);
		//		String absoluteServerPath = linkName;
		java.io.File targetFile = null;
		if (absoluteServerPath != null && !absoluteServerPath.equals("")) {
			targetFile = new java.io.File(absoluteServerPath);
			FileUtils.copyInputStreamToFile (fileContent, targetFile);
		} else {
			return null;
		}

		if (options.getValidation () != null && !options.getValidation ().check (absoluteServerPath, file.getContentType ())) {

			delete (req, linkName);
			throw new EgovBizException ("File does not meet the validation.");
		}

		// 정보 셋팅
		EditorFileVO fileVO = new EditorFileVO ();
		fileVO.setLink (options.getStreamingUrl ());
		fileVO.setFullPath (linkName);
		fileVO.setFileExtsn (file_extsn);
		fileVO.setOriginFileNm (file.getOriginalFilename ());
		fileVO.setSysFileNm (name);
		fileVO.setUploadDir (fileRoute);
		fileVO.setFileSize (file.getSize ());
		fileVO.setMime (file.getContentType ());
		return fileVO;
	}

	/**
	 * Get absolute server path.
	 *
	 * @param req
	 *           Used to get the servlet context.
	 * @param relativePath
	 *           Relative path.
	 * @return Absolute path.
	 */
	public static String getAbsoluteServerPath (HttpServletRequest req, String relativePath) {
		//		return req.getServletContext().getRealPath(relativePath);
		return relativePath;
	}

	/**
	 * Delete a video from disk.
	 *
	 * @param req
	 *           Used to get the servlet context.
	 * @param src
	 *           Server file path.
	 */
	public static void delete (HttpServletRequest req, String src) {
		File.delete (req, src);
	}

}