/*
 * Copyright (C) 2008-2017, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.juick.server.util;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.MediaType;
import org.springframework.web.multipart.MultipartFile;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Iterator;
import java.util.UUID;

/**
 *
 * @author Ugnich Anton
 */
public class HttpUtils {
    private static final Logger logger = LoggerFactory.getLogger(HttpUtils.class);

    public static URI receiveMultiPartFile(MultipartFile attach, String tmpDir) throws IOException {
        if (attach != null && !attach.isEmpty()) {
            ImageInputStream iis = ImageIO.createImageInputStream(attach.getInputStream());
            Iterator<ImageReader> readers = ImageIO.getImageReaders(iis);

            String format = StringUtils.EMPTY;
            while (readers.hasNext()) {
                ImageReader read = readers.next();
                format = read.getFormatName();
            }
            String attachmentType = attachmentTypeFromFormat(format);
            if (attachmentType.equals("jpg") || attachmentType.equals("png")) {
                String attachmentFName = DigestUtils.md5Hex(UUID.randomUUID().toString()) + "." + attachmentType;
                try {
                    Files.write(Paths.get(tmpDir, attachmentFName),
                            attach.getBytes());
                    return URI.create(String.format("juick://%s", attachmentFName));
                } catch (IOException e) {
                    logger.warn("file receive error", e);
                }
            }
            logger.warn("file type is unknown: {}", attach.getOriginalFilename());
        }
        return URI.create(StringUtils.EMPTY);
    }

    private static String attachmentTypeFromFormat(String format) throws IOException {
        if (format != null && format.equals("JPEG")) {
            return "jpg";
        } else if (format != null && format.equals("png")) {
            return "png";
        } else {
            throw new IOException("Wrong file type: " + format);
        }
    }

    public static String mediaType(String attachmentType) {
        return attachmentType.equals("jpg") ? MediaType.IMAGE_JPEG_VALUE : MediaType.IMAGE_PNG_VALUE;
    }

    public static URI downloadImage(URL url, String tmpDir) throws IOException {
        ImageInputStream iis = ImageIO.createImageInputStream(url.openStream());
        Iterator<ImageReader> readers = ImageIO.getImageReaders(iis);

        String format = StringUtils.EMPTY;
        while (readers.hasNext()) {
            ImageReader read = readers.next();
            format = read.getFormatName();
        }
        URLConnection urlConn;
        try {
            urlConn = url.openConnection();
        } catch (IOException e) {
            logger.error(String.format("Failed open url: %s", url.toString()));
            throw e;
        }

        try (InputStream is = new BufferedInputStream(urlConn.getInputStream())) {
            String attachmentType = attachmentTypeFromFormat(format);

            String attachmentFName = DigestUtils.md5Hex(UUID.randomUUID().toString()) + "." + attachmentType;
            Files.copy(is, Paths.get(tmpDir, attachmentFName));
            return URI.create(String.format("juick://%s", attachmentFName));
        } catch (IOException e) {
            logger.error(String.format("Failed download image by url: %s", url.toString()), e);
            throw e;
        }
    }
}