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/*
  ZynAddSubFX - a software synthesizer
 
  Sequencer.C - The Sequencer
  Copyright (C) 2003-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License 
  as published by the Free Software Foundation.

  This program 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.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#include <math.h>
#include <stdlib.h>
#include <stdio.h>

#include <sys/time.h>
#include <time.h>

#include "Sequencer.h"



Sequencer::Sequencer(){
    play=0;
    for (int i=0;i<NUM_MIDI_TRACKS;i++){
	miditrack[i].track.first=NULL;
	miditrack[i].track.current=NULL;
	miditrack[i].track.size=0;
	miditrack[i].track.length=0.0;
	miditrack[i].record.first=NULL;
	miditrack[i].record.current=NULL;
	miditrack[i].record.size=0;
	miditrack[i].record.length=0.0;

	nextevent[i].time=0.0;
	resettime(&playtime[i]);
    };
    
    setplayspeed(0);
};

Sequencer::~Sequencer(){
    for (int i=0;i<NUM_MIDI_TRACKS;i++){
	deletelist(&miditrack[i].track);
	deletelist(&miditrack[i].record);
    };
};


int Sequencer::importmidifile(char *filename){
    if (midifile.loadfile(filename)<0) return(-1);

    for (int i=0;i<NUM_MIDI_TRACKS;i++){
	deletelist(&miditrack[i].record);
    };
    if (midifile.parsemidifile(this)<0) return(-1);
    
    //copy the "record" track to the main track
    for (int i=0;i<NUM_MIDI_TRACKS;i++){
	deletelist(&miditrack[i].track);
	miditrack[i].track=miditrack[i].record;
	deletelistreference(&miditrack[i].record);
    };
    return(0);
};



void Sequencer::startplay(){
    if (play!=0) return;
    for (int i=0;i<NUM_MIDI_TRACKS;i++) resettime(&playtime[i]);
    
    for (int i=0;i<NUM_MIDI_TRACKS;i++){
	rewindlist(&miditrack[i].track);
    };
    play=1;
    
};
void Sequencer::stopplay(){
    if (play==0) return;
    play=0;
};

// ************ Player stuff ***************

int Sequencer::getevent(char ntrack,int *midich, int *type,int *par1, int *par2){
    *type=0;
    if (play==0) return(-1);

    //test
//    if (ntrack!=0) return(-1);

    updatecounter(&playtime[(int)ntrack]);

//    printf("%g %g\n",nextevent[ntrack].time,playtime[ntrack].abs);

    if (nextevent[(int)ntrack].time<playtime[(int)ntrack].abs) readevent(&miditrack[(int)ntrack].track,&nextevent[(int)ntrack].ev);
	else return(-1);
    if (nextevent[(int)ntrack].ev.type==-1) return(-1);
//    printf("********************************\n");    

    //sa pun aici o protectie. a.i. daca distanta dintre timpul curent si eveliment e prea mare (>1sec) sa elimin nota

    if (ntrack==1) printf("_ %f %.2f  (%d)\n",nextevent[(int)ntrack].time,playtime[(int)ntrack].abs,nextevent[(int)ntrack].ev.par2);

    *type=nextevent[(int)ntrack].ev.type;
    *par1=nextevent[(int)ntrack].ev.par1;
    *par2=nextevent[(int)ntrack].ev.par2;
    *midich=nextevent[(int)ntrack].ev.channel;

    
    double dt=nextevent[(int)ntrack].ev.deltatime*0.0001*realplayspeed;
    printf("zzzzzzzzzzzzzz[%d] %d\n",ntrack,nextevent[(int)ntrack].ev.deltatime);
    nextevent[(int)ntrack].time+=dt;

//    printf("%f   -  %d %d \n",nextevent[ntrack].time,par1,par2);
    return(0);//?? sau 1
};

/************** Timer stuff ***************/

void Sequencer::resettime(timestruct *t){
    t->abs=0.0;
    t->rel=0.0;
    
    timeval tval;
    
    t->last=0.0;
    #ifndef OS_WINDOWS
    if (gettimeofday(&tval,NULL)==0)  
	t->last=tval.tv_sec+tval.tv_usec*0.000001;
    #endif
    
};

void Sequencer::updatecounter(timestruct *t){
    timeval tval;
    double current=0.0;
    #ifndef OS_WINDOWS
    if (gettimeofday(&tval,NULL)==0)  
	current=tval.tv_sec+tval.tv_usec*0.000001;
    #endif
    
    t->rel=current - t->last;
    t->abs+=t->rel;
    t->last=current;
    
//    printf("%f %f %f\n",t->last,t->abs,t->rel);
};

void Sequencer::setplayspeed(int speed){
    playspeed=speed;
    realplayspeed=pow(10.0,speed/128.0);
};