// ------------------------------------------------------------------------
// audiofx_envelope-modulation.cpp: Effects which modify/modulate signal
//                                   envelope
// Copyright (C) 2000 Rob Coker, rcs@birch.net
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// 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 for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
// ------------------------------------------------------------------------

#include <cmath>

#include <kvutils/message_item.h>

#include "samplebuffer_iterators.h"
#include "audiofx_envelope-modulation.h"

#include "eca-debug.h"
#include "eca-error.h"

EFFECT_PULSE_GATE::EFFECT_PULSE_GATE (parameter_type freq_Hz,
															parameter_type onTime_percent) {
  set_parameter(1, freq_Hz);
  set_parameter(2, onTime_percent);
	currentTime = 0.0;
	incrTime = 1.0/samples_per_second();
}

void EFFECT_PULSE_GATE::set_parameter(int param, parameter_type value) {
  MESSAGE_ITEM otemp;
  switch (param) {
  case 1: 
    if (value > 0)
		{
			period = 1.0/value; // seconds
		}
		else
    {
	    otemp << "(audiofx_envelope-modulation) WARNING! Frequency must be greater than 0! ";
		}
    break;
  case 2:
    if ((value > 0) && (value < 100))
		{
			stopTime = (value/100.0)*period; // seconds
		}
		else
    {
	    otemp << "(audiofx_envelope-modulation) WARNING! on time must be between 0 and 100 inclusive! ";
		}
    break;
  }
  ecadebug->msg(otemp.to_string());
}

CHAIN_OPERATOR::parameter_type EFFECT_PULSE_GATE::get_parameter(int param) const {
  switch (param) {
  case 1: 
    return(1.0/period);
		break;
	case 2:
		return (stopTime/period)*100.0;
		break;
  }
  return(0.0);
}

void EFFECT_PULSE_GATE::init(SAMPLE_BUFFER* sbuf) { i.init(sbuf); }

void EFFECT_PULSE_GATE::process(void) {
  i.begin();
  while(!i.end()) {
		currentTime += incrTime;
		if (currentTime > period)
		{
			currentTime = 0.0;
		}
		if (currentTime > stopTime)
		{
      *i.current() = 0.0;
    }
    i.next();
  }
}