/*
 * Jitsi, the OpenSource Java VoIP and Instant Messaging client.
 *
 * Copyright @ 2015 Atlassian Pty Ltd
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-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 net.java.sip.communicator.impl.replacement.vimeo;

import java.io.*;
import java.net.*;
import java.util.regex.*;

import net.java.sip.communicator.service.replacement.*;
import net.java.sip.communicator.util.*;

import org.json.simple.*;

/**
 * Implements the {@link ReplacementService} to provide previews for Vimeo
 * links.
 *
 * @author Purvesh Sahoo
 */
public class ReplacementServiceVimeoImpl
    implements ReplacementService
{
    /**
     * The logger for this class.
     */
    private static final Logger logger =
        Logger.getLogger(ReplacementServiceVimeoImpl.class);

    /**
     * The regex used to match the link in the message.
     */
    public static final String VIMEO_PATTERN =
        "(https?\\:\\/\\/(www\\.)*?vimeo\\.com"
        + "\\/([a-zA-Z0-9_\\-]+))";

    /**
     * Configuration label shown in the config form.
     */
    public static final String VIMEO_CONFIG_LABEL = "Vimeo";

    /**
     * Source name; also used as property label.
     */
    public static final String SOURCE_NAME = "VIMEO";

    /**
     * Constructor for <tt>ReplacementServiceVimeoImpl</tt>.
     */
    public ReplacementServiceVimeoImpl()
    {
        logger.trace("Creating a Vimeo Source.");
    }

    /**
     * Returns the thumbnail URL of the video link provided.
     *
     * @param sourceString the original video link.
     * @return the thumbnail image link; the original link in case of no match.
     */
    public String getReplacement(String sourceString)
    {
        final Pattern p =
            Pattern.compile(".+\\.com\\/([a-zA-Z0-9_\\-]+)",
                Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
        Matcher m = p.matcher(sourceString);

        String thumbUrl = sourceString;

        while (m.find())
        {
            try
            {
                String url =
                    "http://vimeo.com/api/v2/video/" + m.group(1) + ".json";
                URL vimeoURL = new URL(url);
                URLConnection conn = vimeoURL.openConnection();

                BufferedReader in =
                    new BufferedReader(new InputStreamReader(conn
                        .getInputStream()));

                String inputLine, holder = "";

                while ((inputLine = in.readLine()) != null)
                    holder = inputLine;
                in.close();

                JSONArray result = (JSONArray)JSONValue
                    .parseWithException(holder);

                if (!(result.isEmpty()))
                {
                    thumbUrl
                        = (String)((JSONObject)result.get(0))
                            .get("thumbnail_medium");
                }
            }
            catch (Throwable e)
            {
                logger.error("Error parsing", e);
            }
        }

        return thumbUrl;
    }

    /**
     * Returns the source name
     *
     * @return the source name
     */
    public String getSourceName()
    {
        return SOURCE_NAME;
    }

    /**
     * Returns the pattern of the source
     *
     * @return the source pattern
     */
    public String getPattern()
    {
        return VIMEO_PATTERN;
    }
}