import javax.sound.midi.*;
public class Helilooja4{
 public static void main(String argumendid[]) throws Exception{
         int[] cduur={60, 64, 67, 72, 76};
         int[] fduur={53, 57, 60, 65, 69};
         int[] gduur={55, 59, 62, 67, 71};
         String akordid="CCCCCCCCGGGGGGGGCCCCGGFGCCCCGGFGCCCCGGGGCCCCGGFGCCCCGGFGCC";
         ShortMessage algus = new ShortMessage();
         algus.setMessage(ShortMessage.PROGRAM_CHANGE, 0, 21, 0);
         //Sequence sekvents=new Sequence(Sequence.PPQ, 4);
         Sequence sekvents=MidiSystem.getSequence(
                              new java.io.File("madis.mid"));
          //Taktimõõt 2/4, ehk 4 tiksu löögi, 8 tiksu takti kohta
         int taktidearv=akordid.length();
         int looketaktis=3;
         int tikseloogis=4;
         int taktipikkus=looketaktis*tikseloogis; //tiksu
         Track rada=sekvents.createTrack();
         rada.add(new MidiEvent(algus, 0));
         int noodinr=0;
         for(int takt=0; takt<taktidearv; takt++){
           int noodid[]=cduur;
           if(akordid.charAt(takt)=='F'){noodid=fduur;}
           if(akordid.charAt(takt)=='G'){noodid=gduur;}
           for(int look=0; look<looketaktis; look++){
             int loogialgus=taktipikkus*takt+tikseloogis*look;
             ShortMessage lahti = new ShortMessage();
             ShortMessage kinni = new ShortMessage();
             int helikorgus=noodid[noodinr];
             lahti.setMessage(ShortMessage.NOTE_ON, 
              0, helikorgus, 50);
             kinni.setMessage(ShortMessage.NOTE_OFF, 
              0, helikorgus, 50);
             rada.add(new MidiEvent(lahti, loogialgus));
             rada.add(new MidiEvent(kinni, loogialgus+tikseloogis+2));
             if(Math.random()<0.5){
               if(noodinr>0){noodinr--;}
             } else{
               if(noodinr<noodid.length-1){noodinr++;}
             }
           }
         }
         MidiSystem.write(sekvents, 1, 
                    new java.io.FileOutputStream("lugu.mid"));
         Sequencer sequencer=MidiSystem.getSequencer();
         sequencer.open();
         sequencer.setSequence(sekvents);
         sequencer.start();
         sequencer.setTempoInBPM(180);
         sequencer.addMetaEventListener(new MetaEventListener(){
           public void meta(MetaMessage m){
             //kui lugu läbi, siis lõpetatakse
             if(m.getType()==47){System.exit(0);}
           }
         });
  }
}