/*

 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package com.sun.media.sound;

import java.io.DataOutputStream;

import java.io.PipedInputStream;

import java.io.PipedOutputStream;

import java.io.ByteArrayOutputStream;

import java.io.ByteArrayInputStream;

import java.io.SequenceInputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.IOException;

import java.io.OutputStream;

import javax.sound.midi.InvalidMidiDataException;

import javax.sound.midi.MidiEvent;

import javax.sound.midi.MetaMessage;

import javax.sound.midi.Sequence;

import javax.sound.midi.ShortMessage;

import javax.sound.midi.SysexMessage;

import javax.sound.midi.Track;

import javax.sound.midi.spi.MidiFileWriter;

/**

 * MIDI file writer.

 *

 * @author Kara Kytle

 * @author Jan Borgersen

 */

public final class StandardMidiFileWriter extends MidiFileWriter {

    private static final int MThd_MAGIC = 0x4d546864;  // 'MThd'

    private static final int MTrk_MAGIC = 0x4d54726b;  // 'MTrk'

    private static final int ONE_BYTE   = 1;

    private static final int TWO_BYTE   = 2;

    private static final int SYSEX      = 3;

    private static final int META       = 4;

    private static final int ERROR      = 5;

    private static final int IGNORE     = 6;

    private static final int MIDI_TYPE_0 = 0;

    private static final int MIDI_TYPE_1 = 1;

    private static final int bufferSize = 16384;  // buffersize for write

    private DataOutputStream tddos;               // data output stream for track writing

    /**

     * MIDI parser types

     */

    private static final int types[] = {

        MIDI_TYPE_0,

        MIDI_TYPE_1

    };

    /**

     * new

     */

    public int[] getMidiFileTypes() {

        int[] localArray = new int[types.length];

        System.arraycopy(types, 0, localArray, 0, types.length);

        return localArray;

    }

    /**

     * Obtains the file types that this provider can write from the

     * sequence specified.

     * @param sequence the sequence for which midi file type support

     * is queried

     * @return array of file types.  If no file types are supported,

     * returns an array of length 0.

     */

    public int[] getMidiFileTypes(Sequence sequence){

        int typesArray[];

        Track tracks[] = sequence.getTracks();

        if( tracks.length==1 ) {

            typesArray = new int[2];

            typesArray[0] = MIDI_TYPE_0;

            typesArray[1] = MIDI_TYPE_1;

        } else {

            typesArray = new int[1];

            typesArray[0] = MIDI_TYPE_1;

        }

        return typesArray;

    }

    public boolean isFileTypeSupported(int type) {

        for(int i=0; i<types.length; i++) {

            if( type == types[i] ) {

                return true;

            }

        }

        return false;

    }

    public int write(Sequence in, int type, OutputStream out) throws IOException {

        byte [] buffer = null;

        int bytesRead = 0;

        long bytesWritten = 0;

        if( !isFileTypeSupported(type,in) ) {

            throw new IllegalArgumentException("Could not write MIDI file");

        }

        // First get the fileStream from this sequence

        InputStream fileStream = getFileStream(type,in);

        if (fileStream == null) {

            throw new IllegalArgumentException("Could not write MIDI file");

        }

        buffer = new byte[bufferSize];

        while( (bytesRead = fileStream.read( buffer )) >= 0 ) {

            out.write( buffer, 0, bytesRead );

            bytesWritten += bytesRead;

        }

        // Done....return bytesWritten

        return (int) bytesWritten;

    }

    public int write(Sequence in, int type, File out) throws IOException {

        FileOutputStream fos = new FileOutputStream(out); // throws IOException

        int bytesWritten = write( in, type, fos );

        fos.close();

        return bytesWritten;

    }

    //=================================================================================

    private InputStream getFileStream(int type, Sequence sequence) throws IOException {

        Track tracks[] = sequence.getTracks();

        int bytesBuilt = 0;

        int headerLength = 14;

        int length = 0;

        int timeFormat;

        float divtype;

        PipedOutputStream   hpos = null;

        DataOutputStream    hdos = null;

        PipedInputStream    headerStream = null;

        InputStream         trackStreams [] = null;

        InputStream         trackStream = null;

        InputStream fStream = null;

        // Determine the filetype to write

        if( type==MIDI_TYPE_0 ) {

            if (tracks.length != 1) {

                return null;

            }

        } else if( type==MIDI_TYPE_1 ) {

            if (tracks.length < 1) { // $$jb: 05.31.99: we _can_ write TYPE_1 if tracks.length==1

                return null;

            }

        } else {

            if(tracks.length==1) {

                type = MIDI_TYPE_0;

            } else if(tracks.length>1) {

                type = MIDI_TYPE_1;

            } else {

                return null;

            }

        }

        // Now build the file one track at a time

        // Note that above we made sure that MIDI_TYPE_0 only happens

        // if tracks.length==1

        trackStreams = new InputStream[tracks.length];

        int trackCount = 0;

        for(int i=0; i<tracks.length; i++) {

            try {

                trackStreams[trackCount] = writeTrack( tracks[i], type );

                trackCount++;

            } catch (InvalidMidiDataException e) {

                if(Printer.err) Printer.err("Exception in write: " + e.getMessage());

            }

            //bytesBuilt += trackStreams[i].getLength();

        }

        // Now seqence the track streams

        if( trackCount == 1 ) {

            trackStream = trackStreams[0];

        } else if( trackCount > 1 ){

            trackStream = trackStreams[0];

            for(int i=1; i<tracks.length; i++) {

                // fix for 5048381: NullPointerException when saving a MIDI sequence

                // don't include failed track streams

                if (trackStreams[i] != null) {

                    trackStream = new SequenceInputStream( trackStream, trackStreams[i]);

                }

            }

        } else {

            throw new IllegalArgumentException("invalid MIDI data in sequence");

        }

        // Now build the header...

        hpos = new PipedOutputStream();

        hdos = new DataOutputStream(hpos);

        headerStream = new PipedInputStream(hpos);

        // Write the magic number

        hdos.writeInt( MThd_MAGIC );

        // Write the header length

        hdos.writeInt( headerLength - 8 );

        // Write the filetype

        if(type==MIDI_TYPE_0) {

            hdos.writeShort( 0 );

        } else {

            // MIDI_TYPE_1

            hdos.writeShort( 1 );

        }

        // Write the number of tracks

        hdos.writeShort( (short) trackCount );

        // Determine and write the timing format

        divtype = sequence.getDivisionType();

        if( divtype == Sequence.PPQ ) {

            timeFormat = sequence.getResolution();

        } else if( divtype == Sequence.SMPTE_24) {

            timeFormat = (24<<8) * -1;

            timeFormat += (sequence.getResolution() & 0xFF);

        } else if( divtype == Sequence.SMPTE_25) {

            timeFormat = (25<<8) * -1;

            timeFormat += (sequence.getResolution() & 0xFF);

        } else if( divtype == Sequence.SMPTE_30DROP) {

            timeFormat = (29<<8) * -1;

            timeFormat += (sequence.getResolution() & 0xFF);

        } else if( divtype == Sequence.SMPTE_30) {

            timeFormat = (30<<8) * -1;

            timeFormat += (sequence.getResolution() & 0xFF);

        } else {

            // $$jb: 04.08.99: What to really do here?

            return null;

        }

        hdos.writeShort( timeFormat );

        // now construct an InputStream to become the FileStream

        fStream = new SequenceInputStream(headerStream, trackStream);

        hdos.close();

        length = bytesBuilt + headerLength;

        return fStream;

    }

    /**

     * Returns ONE_BYTE, TWO_BYTE, SYSEX, META,

     * ERROR, or IGNORE (i.e. invalid for a MIDI file)

     */

    private int getType(int byteValue) {

        if ((byteValue & 0xF0) == 0xF0) {

            switch(byteValue) {

            case 0xF0:

            case 0xF7:

                return SYSEX;

            case 0xFF:

                return META;

            }

            return IGNORE;

        }

        switch(byteValue & 0xF0) {

        case 0x80:

        case 0x90:

        case 0xA0:

        case 0xB0:

        case 0xE0:

            return TWO_BYTE;

        case 0xC0:

        case 0xD0:

            return ONE_BYTE;

        }

        return ERROR;

    }

    private int writeVarInt(long value) throws IOException {

        int len = 1;

        int shift=63; // number of bitwise left-shifts of mask

        // first screen out leading zeros

        while ((shift > 0) && ((value & (mask << shift)) == 0)) shift-=7;

        // then write actual values

        while (shift > 0) {

            tddos.writeByte((int) (((value & (mask << shift)) >> shift) | 0x80));

            shift-=7;

            len++;

        }

        tddos.writeByte((int) (value & mask));

        return len;

    }

    private InputStream writeTrack( Track track, int type ) throws IOException, InvalidMidiDataException {

        int bytesWritten = 0;

        int lastBytesWritten = 0;

        int size = track.size();

        PipedOutputStream thpos = new PipedOutputStream();

        DataOutputStream  thdos = new DataOutputStream(thpos);

        PipedInputStream  thpis = new PipedInputStream(thpos);

        ByteArrayOutputStream tdbos = new ByteArrayOutputStream();

        tddos = new DataOutputStream(tdbos);

        ByteArrayInputStream tdbis = null;

        SequenceInputStream  fStream = null;

        long currentTick = 0;

        long deltaTick = 0;

        long eventTick = 0;

        int runningStatus = -1;

        // -----------------------------

        // Write each event in the track

        // -----------------------------

        for(int i=0; i<size; i++) {

            MidiEvent event = track.get(i);

            int status;

            int eventtype;

            int metatype;

            int data1, data2;

            int length;

            byte data[] = null;

            ShortMessage shortMessage = null;

            MetaMessage  metaMessage  = null;

            SysexMessage sysexMessage = null;

            // get the tick

            // $$jb: this gets easier if we change all system-wide time to delta ticks

            eventTick = event.getTick();

            deltaTick = event.getTick() - currentTick;

            currentTick = event.getTick();

            // get the status byte

            status = event.getMessage().getStatus();

            eventtype = getType( status );

            switch( eventtype ) {

            case ONE_BYTE:

                shortMessage = (ShortMessage) event.getMessage();

                data1 = shortMessage.getData1();

                bytesWritten += writeVarInt( deltaTick );

                if(status!=runningStatus) {

                    runningStatus=status;

                    tddos.writeByte(status);  bytesWritten += 1;

                }

                tddos.writeByte(data1);   bytesWritten += 1;

                break;

            case TWO_BYTE:

                shortMessage = (ShortMessage) event.getMessage();

                data1 = shortMessage.getData1();

                data2 = shortMessage.getData2();

                bytesWritten += writeVarInt( deltaTick );

                if(status!=runningStatus) {

                    runningStatus=status;

                    tddos.writeByte(status);  bytesWritten += 1;

                }

                tddos.writeByte(data1);   bytesWritten += 1;

                tddos.writeByte(data2);   bytesWritten += 1;

                break;

            case SYSEX:

                sysexMessage = (SysexMessage) event.getMessage();

                length     = sysexMessage.getLength();

                data       = sysexMessage.getMessage();

                bytesWritten += writeVarInt( deltaTick );

                // $$jb: 04.08.99: always write status for sysex

                runningStatus=status;

                tddos.writeByte( data[0] ); bytesWritten += 1;

                // $$jb: 10.18.99: we don't maintain length in

                // the message data for SysEx (it is not transmitted

                // over the line), so write the calculated length

                // minus the status byte

                bytesWritten += writeVarInt( (data.length-1) );

                // $$jb: 10.18.99: now write the rest of the

                // message

                tddos.write(data, 1, (data.length-1));

                bytesWritten += (data.length-1);

                break;

            case META:

                metaMessage = (MetaMessage) event.getMessage();

                length    = metaMessage.getLength();

                data      = metaMessage.getMessage();

                bytesWritten += writeVarInt( deltaTick );

                // $$jb: 10.18.99: getMessage() returns the

                // entire valid midi message for a file,

                // including the status byte and the var-length-int

                // length value, so we can just write the data

                // here.  note that we must _always_ write the

                // status byte, regardless of runningStatus.

                runningStatus=status;

                tddos.write( data, 0, data.length );

                bytesWritten += data.length;

                break;

            case IGNORE:

                // ignore this event

                break;

            case ERROR:

                // ignore this event

                break;

            default:

                throw new InvalidMidiDataException("internal file writer error");

            }

        }

        // ---------------------------------

        // End write each event in the track

        // ---------------------------------

        // Build Track header now that we know length

        thdos.writeInt(MTrk_MAGIC);

        thdos.writeInt(bytesWritten);

        bytesWritten += 8;

        // Now sequence them

        tdbis = new ByteArrayInputStream( tdbos.toByteArray() );

        fStream = new SequenceInputStream(thpis,tdbis);

        thdos.close();

        tddos.close();

        return fStream;

    }

}