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/*
  ZynAddSubFX - a software synthesizer
 
  EffectMgr.C - Effect manager, an interface betwen the program and effects
  Copyright (C) 2002-2005 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 <stdlib.h>
#include <stdio.h>
#include "EffectMgr.h"
#include "../Misc/Master.h"

EffectMgr::EffectMgr(int insertion_,Master* master_){
    setpresettype("Peffect");
    efx=NULL;
    nefx=0;
    insertion=insertion_;
    master=master_;
    efxoutl=new REALTYPE[SOUND_BUFFER_SIZE];
    efxoutr=new REALTYPE[SOUND_BUFFER_SIZE];;
    for (int i=0;i<SOUND_BUFFER_SIZE;i++){
	efxoutl[i]=0.0;
	efxoutr[i]=0.0;
    };
    filterpars=NULL;
    dryonly=false;
    defaults();
};


EffectMgr::~EffectMgr(){
    if (efx!=NULL) delete (efx);
    delete (efxoutl);
    delete (efxoutr);
};

void EffectMgr::defaults(){
    changeeffect(0);
    setdryonly(false);
};

/*
 * Change the effect
 */
void EffectMgr::changeeffect(int nefx_){
    cleanup();
    if (nefx==nefx_) return;
    nefx=nefx_;
    for (int i=0;i<SOUND_BUFFER_SIZE;i++){
	efxoutl[i]=0.0;
	efxoutr[i]=0.0;
    };

    if (efx!=NULL) delete (efx);
    switch (nefx){
	case 1:efx=new Reverb(insertion,efxoutl,efxoutr);break;
	case 2:efx=new Echo(insertion,efxoutl,efxoutr);break;
	case 3:efx=new Chorus(insertion,efxoutl,efxoutr);break;
	case 4:efx=new Phaser(insertion,efxoutl,efxoutr);break;
	case 5:efx=new Alienwah(insertion,efxoutl,efxoutr);break;
	case 6:efx=new Distorsion(insertion,efxoutl,efxoutr);break;
	case 7:efx=new EQ(insertion,efxoutl,efxoutr);break;
	case 8:efx=new DynamicFilter(insertion,efxoutl,efxoutr);break;
	//put more effect here
	default:efx=NULL;break;//no effect (thru)
    };
    
    if (efx!=NULL) filterpars=efx->filterpars;
};

/*
 * Obtain the effect number
 */
int EffectMgr::geteffect(){
    return (nefx);
};

/*
 * Cleanup the current effect
 */
void EffectMgr::cleanup(){
    if (efx!=NULL) efx->cleanup();
};


/*
 * Get the preset of the current effect
 */
 
unsigned char EffectMgr::getpreset(){
    if (efx!=NULL) return(efx->Ppreset);
	else return(0);
};

/*
 * Change the preset of the current effect
 */
void EffectMgr::changepreset_nolock(unsigned char npreset){
    if (efx!=NULL) efx->setpreset(npreset);
};

/*
 * Change the preset of the current effect(with thread locking)
 */
void EffectMgr::changepreset(unsigned char npreset){
    master->lock();
    changepreset_nolock(npreset);
    master->unlock();
};


/*
 * Change a parameter of the current effect 
 */
void EffectMgr::seteffectpar_nolock(int npar,unsigned char value){
    if (efx==NULL) return;
    efx->changepar(npar,value);
};

/*
 * Change a parameter of the current effect (with thread locking)
 */
void EffectMgr::seteffectpar(int npar,unsigned char value){
    master->lock();
    seteffectpar_nolock(npar,value);
    master->unlock();
};

/*
 * Get a parameter of the current effect
 */
unsigned char EffectMgr::geteffectpar(int npar){
    if (efx==NULL) return(0);
    return(efx->getpar(npar));
};


/*
 * Apply the effect
 */
void EffectMgr::out(REALTYPE *smpsl,REALTYPE *smpsr){
    int i;
    if (efx==NULL){
	if (insertion==0) 
	    for (i=0;i<SOUND_BUFFER_SIZE;i++){
	     smpsl[i]=0.0;smpsr[i]=0.0;
	     efxoutl[i]=0.0;efxoutr[i]=0.0;
	    };
	return;
    };
    for (i=0;i<SOUND_BUFFER_SIZE;i++){
	smpsl[i]+=denormalkillbuf[i];
	smpsr[i]+=denormalkillbuf[i];
	efxoutl[i]=0.0;
	efxoutr[i]=0.0;
    };
    efx->out(smpsl,smpsr);
    
    REALTYPE volume=efx->volume;
    
    if (nefx==7){//this is need only for the EQ effect
	for (i=0;i<SOUND_BUFFER_SIZE;i++){
	    smpsl[i]=efxoutl[i];
	    smpsr[i]=efxoutr[i];
	};
	return;
    };
    
    //Insertion effect
    if (insertion!=0) {
        REALTYPE v1,v2;
	if (volume<0.5) {
		v1=1.0;
		v2=volume*2.0;
	} else {
		v1=(1.0-volume)*2.0;
		v2=1.0;
    	};
	if ((nefx==1)||(nefx==2)) v2*=v2;//for Reverb and Echo, the wet function is not liniar
	
	if (dryonly){//this is used for instrument effect only
    	    for (i=0;i<SOUND_BUFFER_SIZE;i++){
		smpsl[i]*=v1;
		smpsr[i]*=v1;
		efxoutl[i]*=v2;
		efxoutr[i]*=v2;
	    };
	}else{//normal instrument/insertion effect 
    	    for (i=0;i<SOUND_BUFFER_SIZE;i++){
		smpsl[i]=smpsl[i]*v1+efxoutl[i]*v2;
		smpsr[i]=smpsr[i]*v1+efxoutr[i]*v2;
	    };
	};
    } else {//System effect
	for (i=0;i<SOUND_BUFFER_SIZE;i++){
	    efxoutl[i]*=2.0*volume;
	    efxoutr[i]*=2.0*volume;
	    smpsl[i]=efxoutl[i];
	    smpsr[i]=efxoutr[i];
	};
    };
    
};

/*
 * Get the effect volume for the system effect
 */
REALTYPE EffectMgr::sysefxgetvolume(){
    if (efx==NULL) return (1.0);
	else return(efx->outvolume);    
};


/*
 * Get the EQ response
 */
REALTYPE EffectMgr::getEQfreqresponse(REALTYPE freq){
    if (nefx==7) return(efx->getfreqresponse(freq));
	else return(0.0);
};


void EffectMgr::setdryonly(bool value){
    dryonly=value;
};

void EffectMgr::add2XML(XMLwrapper *xml){
    xml->addpar("type",geteffect());

    if ((efx==NULL)||(geteffect()==0)) return;
    xml->addpar("preset",efx->Ppreset);

    xml->beginbranch("EFFECT_PARAMETERS");
	for (int n=0;n<128;n++){
	    int par=geteffectpar(n);
	    if (par==0) continue;
	    xml->beginbranch("par_no",n);
		xml->addpar("par",par);
	    xml->endbranch();
	};
	if (filterpars!=NULL){
	    xml->beginbranch("FILTER");
		filterpars->add2XML(xml);
	    xml->endbranch();
	};
    xml->endbranch();
};

void EffectMgr::getfromXML(XMLwrapper *xml){
    changeeffect(xml->getpar127("type",geteffect()));

    if ((efx==NULL)||(geteffect()==0)) return;
    
    efx->Ppreset=xml->getpar127("preset",efx->Ppreset);

    if (xml->enterbranch("EFFECT_PARAMETERS")){
	for (int n=0;n<128;n++){
	    seteffectpar_nolock(n,0);//erase effect parameter
	    if (xml->enterbranch("par_no",n)==0) continue;

	    int par=geteffectpar(n);
	    seteffectpar_nolock(n,xml->getpar127("par",par));
	    xml->exitbranch();
	};
	if (filterpars!=NULL){
	    if (xml->enterbranch("FILTER")){
		filterpars->getfromXML(xml);
		xml->exitbranch();
	    };
	};
	xml->exitbranch();
    };
    cleanup();
};