package de.hsel.spm.baudas.web;

import org.jetbrains.annotations.NotNull;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

/**
 * saves uploaded files.
 *
 * @author Johannes Theiner
 * @version 0.1
 * @since 0.1
 **/

@WebServlet("/upload")
@MultipartConfig
public class Upload extends HttpServlet {

    private static final long serialVersionUID = 14144111845151L;

    /**
     * doPost.
     *
     * @param req  request
     * @param resp response
     * @throws ServletException could not get file part
     * @throws IOException      writer could not be retrieved
     */
    @Override
    protected void doPost(@NotNull HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        req.setCharacterEncoding(StandardCharsets.UTF_8.name());

        Part filePart = req.getPart("file");
        String fileName = Paths.get(filePart.getSubmittedFileName()).getFileName().toString();
        InputStream inputStream = filePart.getInputStream();


        Path path = Data.add(fileName);
        if (!Files.exists(path)) {
            Files.createFile(path);
        }

        Files.copy(inputStream, path, StandardCopyOption.REPLACE_EXISTING);

        resp.sendRedirect("");
    }
}