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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file to you 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 org.red5.io.webm;

import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import org.red5.io.matroska.ConverterException;
import org.red5.io.matroska.dtd.Tag;
import org.red5.io.matroska.parser.TagCrawler;
import org.red5.io.matroska.parser.TagHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Class able to parse webm Tags from file
 *
 */
public class WebmReader implements Closeable {

    private static Logger log = LoggerFactory.getLogger(WebmReader.class);

    private FileInputStream fis = null;

    private final TagConsumer processor;

    private TagCrawler crawler;

    /**
     * Constructor
     *
     * @param file
     *            - file to be read
     * @param processor
     *            - handler for the tags found
     * @throws FileNotFoundException
     *             - will be thrown if file not found
     */
    public WebmReader(File file, TagConsumer processor) throws FileNotFoundException {
        fis = new FileInputStream(file);
        this.processor = processor;

        final TagHandler valueTagHandler = new TagHandler() {
            @Override
            public void handle(Tag tag, InputStream input) throws IOException, ConverterException {
                if (tag != null) {
                    log.debug("Tag found: {}", tag);
                    tag.parse();
                    WebmReader.this.processor.consume(tag);
                } else {
                    log.trace("Tag is null");
                }
            }
        };

        final TagHandler masterTagHandler = new TagHandler() {
            @Override
            public void handle(Tag tag, InputStream input) throws IOException, ConverterException {
                //log.debug("Tag found: " + tag.getName());
                WebmReader.this.processor.consume(tag);
            }
        };

        crawler = new TagCrawler() {
            @Override
            public TagHandler createSkipHandler() {
                return valueTagHandler;
            }
        };

        // we don't parse all compound tags
        crawler.addHandler("EBML", masterTagHandler);
        crawler.addHandler("CRC32", masterTagHandler);
        crawler.addHandler("Segment", masterTagHandler);
        crawler.addHandler("SeekHead", masterTagHandler);
        crawler.addHandler("Seek", masterTagHandler);
        crawler.addHandler("Info", masterTagHandler);
        crawler.addHandler("Tracks", masterTagHandler);
        crawler.addHandler("TrackEntry", masterTagHandler);
        crawler.addHandler("Video", masterTagHandler);
        crawler.addHandler("Audio", masterTagHandler);
        crawler.addHandler("ContentEncodings", masterTagHandler);
        crawler.addHandler("ContentEncoding", masterTagHandler);
        crawler.addHandler("ContentCompression", masterTagHandler);
        crawler.addHandler("ContentEncryption", masterTagHandler);
        crawler.addHandler("Cluster", masterTagHandler);
        crawler.addHandler("BlockGroup", masterTagHandler);
        crawler.addHandler("BlockAdditions", masterTagHandler);
        crawler.addHandler("BlockMore", masterTagHandler);
        crawler.addHandler("Slices", masterTagHandler);
        crawler.addHandler("TimeSlice", masterTagHandler);
        crawler.addHandler("Cues", masterTagHandler);
        crawler.addHandler("CuePoint", masterTagHandler);
        crawler.addHandler("CueTrackPositions", masterTagHandler);
        crawler.addHandler("CueReference", masterTagHandler);
        crawler.addHandler("Tags", masterTagHandler);
        crawler.addHandler("Tag", masterTagHandler);
        crawler.addHandler("Targets", masterTagHandler);
        crawler.addHandler("SimpleTag", masterTagHandler);
        crawler.addHandler("Chapters", masterTagHandler);
        crawler.addHandler("EditionEntry", masterTagHandler);
        crawler.addHandler("ChapterAtom", masterTagHandler);
        crawler.addHandler("ChapterTrack", masterTagHandler);
        crawler.addHandler("ChapterDisplay", masterTagHandler);
        crawler.addHandler("Attachments", masterTagHandler);
        crawler.addHandler("AttachedFile", masterTagHandler);
    }

    /**
     * will process given file and send all tags found to the consumer
     *
     * @throws IOException
     *             - in case of any exception during reading and/or consumeng
     * @throws ConverterException
     *             - in case of any error during conversions
     */
    public void process() throws IOException, ConverterException {
        crawler.process(fis);
    }

    /**
     * Will close all opened resources
     */
    @Override
    public void close() throws IOException {
        if (fis != null) {
            try {
                fis.close();
                fis = null;
            } catch (Throwable th) {
                //no-op
            }
        }
    }
}