/*  
 * Copyright 2008 CoreMedia AG, Hamburg
 *
 * 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 com.coremedia.iso.boxes;


import com.coremedia.iso.IsoFile;
import com.coremedia.iso.IsoTypeReader;
import com.coremedia.iso.IsoTypeWriter;
import com.coremedia.iso.Utf8;
import com.googlecode.mp4parser.AbstractFullBox;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * This box within a Media Box declares the process by which the media-data in the track is presented,
 * and thus, the nature of the media in a track.
 * This Box when present in a Meta Box, declares the structure or format of the 'meta' box contents.
 * See ISO/IEC 14496-12 for details.
 *
 * @see MetaBox
 * @see MediaBox
 */
public class HandlerBox extends AbstractFullBox {
    public static final String TYPE = "hdlr";
    public static final Map<String, String> readableTypes;

    static {
        HashMap<String, String> hm = new HashMap<String, String>();
        hm.put("odsm", "ObjectDescriptorStream - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");
        hm.put("crsm", "ClockReferenceStream - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");
        hm.put("sdsm", "SceneDescriptionStream - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");
        hm.put("m7sm", "MPEG7Stream - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");
        hm.put("ocsm", "ObjectContentInfoStream - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");
        hm.put("ipsm", "IPMP Stream - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");
        hm.put("mjsm", "MPEG-J Stream - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");
        hm.put("mdir", "Apple Meta Data iTunes Reader");
        hm.put("mp7b", "MPEG-7 binary XML");
        hm.put("mp7t", "MPEG-7 XML");
        hm.put("vide", "Video Track");
        hm.put("soun", "Sound Track");
        hm.put("hint", "Hint Track");
        hm.put("appl", "Apple specific");
        hm.put("meta", "Timed Metadata track - defined in ISO/IEC JTC1/SC29/WG11 - CODING OF MOVING PICTURES AND AUDIO");

        readableTypes = Collections.unmodifiableMap(hm);

    }

    private String handlerType;
    private String name = null;
    private long a, b, c;
    private boolean zeroTerm = true;

    private long shouldBeZeroButAppleWritesHereSomeValue;

    public HandlerBox() {
        super(TYPE);
    }

    public String getHandlerType() {
        return handlerType;
    }

    /**
     * You are required to add a '\0' string termination by yourself.
     *
     * @param name the new human readable name
     */
    public void setName(String name) {
        this.name = name;
    }

    public void setHandlerType(String handlerType) {
        this.handlerType = handlerType;
    }

    public String getName() {
        return name;
    }

    public String getHumanReadableTrackType() {
        return readableTypes.get(handlerType) != null ? readableTypes.get(handlerType) : "Unknown Handler Type";
    }

    protected long getContentSize() {
        if (zeroTerm) {
            return 25 + Utf8.utf8StringLengthInBytes(name);
        } else {
            return 24 + Utf8.utf8StringLengthInBytes(name);
        }

    }

    @Override
    public void _parseDetails(ByteBuffer content) {
        parseVersionAndFlags(content);
        shouldBeZeroButAppleWritesHereSomeValue = IsoTypeReader.readUInt32(content);
        handlerType = IsoTypeReader.read4cc(content);
        a = IsoTypeReader.readUInt32(content);
        b = IsoTypeReader.readUInt32(content);
        c = IsoTypeReader.readUInt32(content);
        if (content.remaining() > 0) {
            name = IsoTypeReader.readString(content, content.remaining());
            if (name.endsWith("\0")) {
                name = name.substring(0, name.length() - 1);
                zeroTerm = true;
            } else {
                zeroTerm = false;
            }
        } else {
            zeroTerm = false; //No string at all, not even zero term char
        }
    }

    @Override
    protected void getContent(ByteBuffer byteBuffer) {
        writeVersionAndFlags(byteBuffer);
        IsoTypeWriter.writeUInt32(byteBuffer, shouldBeZeroButAppleWritesHereSomeValue);
        byteBuffer.put(IsoFile.fourCCtoBytes(handlerType));
        IsoTypeWriter.writeUInt32(byteBuffer, a);
        IsoTypeWriter.writeUInt32(byteBuffer, b);
        IsoTypeWriter.writeUInt32(byteBuffer, c);
        if (name != null) {
            byteBuffer.put(Utf8.convert(name));
        }
        if (zeroTerm) {
            byteBuffer.put((byte) 0);
        }
    }

    public String toString() {
        return "HandlerBox[handlerType=" + getHandlerType() + ";name=" + getName() + "]";
    }
}