/* FFTease for Pd */

#include "fftease.h"

static t_class *taint_class;

#define OBJECT_NAME "taint~"

typedef struct _taint
{
    t_object x_obj;
    float x_f;
    t_fftease *fft;
    t_fftease *fft2;
    t_float mult;
    short mute;
    int invert;
    int invert_countdown; // delay onset of invert effect to avoid loud glitches
    int invert_nextstate; // next state for invert
    t_float invert_pad;
    t_float threshold;
    t_float exponent;
} t_taint;

/* msp function prototypes */

static void taint_dsp(t_taint *x, t_signal **sp);
static t_int *taint_perform(t_int *w);
static void *taint_new(t_symbol *s, int argc, t_atom *argv);
static void taint_invert(t_taint *x, t_floatarg toggle);
static void taint_free(t_taint *x);
static void taint_mute(t_taint *x, t_floatarg toggle);
static void taint_init(t_taint *x);
static void taint_pad(t_taint *x, t_floatarg pad);

void taint_tilde_setup(void)
{
    t_class *c;
    c = class_new(gensym("taint~"), (t_newmethod)taint_new,
                  (t_method)taint_free,sizeof(t_taint), 0,A_GIMME,0);
    CLASS_MAINSIGNALIN(c, t_taint, x_f);
    class_addmethod(c,(t_method)taint_dsp,gensym("dsp"), A_CANT, 0);
    class_addmethod(c,(t_method)taint_mute,gensym("mute"),A_FLOAT,0);
    class_addmethod(c,(t_method)taint_invert,gensym("invert"), A_FLOAT, 0);
    class_addmethod(c,(t_method)taint_pad,gensym("pad"), A_FLOAT, 0);
    taint_class = c;
    fftease_announce(OBJECT_NAME);
}

void taint_mute(t_taint *x, t_floatarg toggle)
{
    x->mute = (short)toggle;
}

void taint_free(t_taint *x)
{
    fftease_free(x->fft);
    fftease_free(x->fft2);
    free(x->fft);
    free(x->fft2);
}

void taint_pad(t_taint *x, t_floatarg pad)
{
    x->invert_pad = pad;
    taint_invert(x,x->invert);//resubmit to invert
}

void taint_invert(t_taint *x, t_floatarg toggle)
{
    t_fftease *fft = x->fft;
    x->invert_nextstate = toggle;
    x->invert_countdown = fft->overlap; // delay effect for "overlap" vectors

    if(x->invert_nextstate){ // lower gain immediately; delay going to invert
        x->fft->mult = (1. / (t_float) x->fft->N) * x->invert_pad;
    } else {
        x->invert = 0; //immediately turn off invert; delay raising gain
    }
}

void *taint_new(t_symbol *s, int argc, t_atom *argv)
{
    t_fftease *fft, *fft2;

    t_taint *x = (t_taint *)pd_new(taint_class);

    inlet_new(&x->x_obj, &x->x_obj.ob_pd,gensym("signal"), gensym("signal"));
    inlet_new(&x->x_obj, &x->x_obj.ob_pd,gensym("signal"), gensym("signal"));
    inlet_new(&x->x_obj, &x->x_obj.ob_pd,gensym("signal"), gensym("signal"));
    outlet_new(&x->x_obj, gensym("signal"));
    x->fft = (t_fftease *) calloc(1,sizeof(t_fftease));
    x->fft2 = (t_fftease *) calloc(1,sizeof(t_fftease));
    fft = x->fft;
    fft2 = x->fft2;
    fft->initialized = 0;
    fft2->initialized = 0;
    x->exponent = 0.25;
    x->threshold = 0.01;

    fft->N = FFTEASE_DEFAULT_FFTSIZE;
    fft->overlap = FFTEASE_DEFAULT_OVERLAP;
    fft->winfac = FFTEASE_DEFAULT_WINFAC;
    fft2->N = FFTEASE_DEFAULT_FFTSIZE;
    fft2->overlap = FFTEASE_DEFAULT_OVERLAP;
    fft2->winfac = FFTEASE_DEFAULT_WINFAC;

    if(argc > 0){ fft->N = fft2->N = (int) atom_getfloatarg(0, argc, argv); }
    if(argc > 1){ fft->overlap = fft2->overlap = (int) atom_getfloatarg(1, argc, argv); }
    return x;
}

void taint_init(t_taint *x)
{
    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;

    short initialized = fft->initialized;

    fftease_init(fft);
    fftease_init(fft2);
    if(!initialized){
        x->invert_pad = 0.025; // -32 dB
        x->invert_countdown = 0;
        x->mute = 0;
        x->invert = 0;
    }
    if(x->invert){
        x->mult *= x->invert_pad;
    }
}

static void do_taint(t_taint *x)
{
    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;
    int i;
    int odd,even;
    t_float a1,b1,a2,b2;
    t_float *bufferOne = fft->buffer;
    t_float *bufferTwo = fft2->buffer;
    int N2 = fft->N2;
    t_float *channelOne = fft->channel;
    t_float *channelTwo = fft2->channel;
    t_float threshold = x->threshold;
    t_float exponent = x->exponent;
    int invert = x->invert;


    /* apply hamming window and fold our window buffer into the fft buffer */

    fftease_fold(fft);
    fftease_fold(fft2);

    /* do an fft */

    fftease_rdft(fft,FFT_FORWARD);
    fftease_rdft(fft2,FFT_FORWARD);

    /* convert to polar coordinates from complex values */

    if (invert) {

        for ( i = 0; i <= N2; i++ ) {

            t_float magnitude;

            odd = ( even = i<<1 ) + 1;

            a1 = ( i == N2 ? *(bufferOne+1) : *(bufferOne+even) );
            b1 = ( i == 0 || i == N2 ? 0. : *(bufferOne+odd) );

            a2 = ( i == N2 ? *(bufferTwo+1) : *(bufferTwo+even) );
            b2 = ( i == 0 || i == N2 ? 0. : *(bufferTwo+odd) );

            *(channelOne+even) = hypot( a1, b1 );
            *(channelOne+odd) = -atan2( b1, a1 );

            magnitude = *(channelTwo+even) = hypot( a2, b2 );
            *(channelTwo+odd) = -atan2( b2, a2 );

            /* use threshold for inverse filtering to avoid division by zero */

            if ( magnitude < threshold )
                magnitude = 0.;

            else
                magnitude = 1. / magnitude;

            *(channelOne+even) *= magnitude;
            *(channelOne+even) = pow( *(channelOne+even), exponent );
        }
    }


    else {

        for ( i = 0; i <= N2; i++ ) {

            odd = ( even = i<<1 ) + 1;

            a1 = ( i == N2 ? *(bufferOne+1) : *(bufferOne+even) );
            b1 = ( i == 0 || i == N2 ? 0. : *(bufferOne+odd) );

            a2 = ( i == N2 ? *(bufferTwo+1) : *(bufferTwo+even) );
            b2 = ( i == 0 || i == N2 ? 0. : *(bufferTwo+odd) );

            *(channelOne+even) = hypot( a1, b1 );
            *(channelOne+odd) = -atan2( b1, a1 );

            *(channelTwo+even) = hypot( a2, b2 );
            *(channelTwo+odd) = -atan2( b2, a2 );

            /* simple multiplication of magnitudes */

            *(channelOne+even) *= *(channelTwo+even);

            *(channelOne+even) = pow( *(channelOne+even), exponent );
        }
    }

    /* convert back to complex form, read for the inverse fft */

    for ( i = 0; i <= N2; i++ ) {

        odd = ( even = i<<1 ) + 1;

        *(bufferOne+even) = *(channelOne+even) * cos( *(channelOne+odd) );

        if ( i != N2 )
            *(bufferOne+odd) = -(*(channelOne+even)) * sin( *(channelOne+odd) );
    }



    fftease_rdft(fft,FFT_INVERSE);

    fftease_overlapadd(fft);

}

t_int *taint_perform(t_int *w)
{
    int
    i,j;

    /* get our inlets and outlets */
    t_taint *x = (t_taint *) (w[1]);
    t_float *MSPInputVector1 = (t_float *)(w[2]);
    t_float *MSPInputVector2 = (t_float *)(w[3]);
    t_float *vec_exponent = (t_float *)(w[4]);
    t_float *vec_threshold = (t_float *)(w[5]);
    t_float *MSPOutputVector = (t_float *)(w[6]);;
    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;

    int MSPVectorSize = fft->MSPVectorSize;
    int operationRepeat = fft->operationRepeat;
    int operationCount = fft->operationCount;
    t_float *internalInputVector1 = fft->internalInputVector;
    t_float *internalInputVector2 = fft2->internalInputVector;
    t_float *internalOutputVector = fft->internalOutputVector;
    t_float *inputOne = fft->input;
    t_float  *inputTwo = fft2->input;
    t_float  *output = fft->output;
    int D = fft->D;
    int Nw = fft->Nw;
    t_float mult = fft->mult;

    //short *connected = x->connected;
    /* dereference structure  */

    x->exponent = *vec_exponent;
    x->threshold = *vec_threshold;


    if(x->mute){
        for(i=0; i < MSPVectorSize; i++){ MSPOutputVector[i] = 0.0; }
        return w+7;
    }


    if(x->invert_countdown > 0){

        --(x->invert_countdown);
        if(! x->invert_countdown){ // countdown just ended
            if(x->invert_nextstate){ // moving to invert (gain is already down)
                x->invert = x->invert_nextstate;
            } else { // invert is already off - now reset gain
                mult = x->fft->mult = 1. / (t_float) x->fft->N;
            }
        }
    }
//
    if( fft->bufferStatus == EQUAL_TO_MSP_VECTOR ){
        memcpy(inputOne, inputOne + D, (Nw - D) * sizeof(t_float));
        memcpy(inputOne + (Nw - D), MSPInputVector1, D * sizeof(t_float));
        memcpy(inputTwo, inputTwo + D, (Nw - D) * sizeof(t_float));
        memcpy(inputTwo + (Nw - D), MSPInputVector2, D * sizeof(t_float));

        do_taint(x);

        for ( j = 0; j < D; j++ ){ *MSPOutputVector++ = output[j] * mult; }
        memcpy(output, output + D, (Nw-D) * sizeof(t_float));
        for(j = (Nw-D); j < Nw; j++){ output[j] = 0.0; }
    }
    else if( fft->bufferStatus == SMALLER_THAN_MSP_VECTOR ) {
        for( i = 0; i < operationRepeat; i++ ){
            memcpy(inputOne, inputOne + D, (Nw - D) * sizeof(t_float));
            memcpy(inputOne + (Nw-D), MSPInputVector1 + (D*i), D * sizeof(t_float));
            memcpy(inputTwo, inputTwo + D, (Nw - D) * sizeof(t_float));
            memcpy(inputTwo + (Nw-D), MSPInputVector2 + (D*i), D * sizeof(t_float));

            do_taint(x);

            for ( j = 0; j < D; j++ ){ *MSPOutputVector++ = output[j] * mult; }
            memcpy(output, output + D, (Nw-D) * sizeof(t_float));
            for(j = (Nw-D); j < Nw; j++){ output[j] = 0.0; }
        }
    }
    else if( fft->bufferStatus == BIGGER_THAN_MSP_VECTOR ) {
        memcpy(internalInputVector1 + (operationCount * MSPVectorSize), MSPInputVector1, MSPVectorSize * sizeof(t_float));
        memcpy(internalInputVector2 + (operationCount * MSPVectorSize), MSPInputVector2, MSPVectorSize * sizeof(t_float));
        memcpy(MSPOutputVector, internalOutputVector + (operationCount * MSPVectorSize), MSPVectorSize * sizeof(t_float));

        operationCount = (operationCount + 1) % operationRepeat;

        if( operationCount == 0 ) {
            memcpy(inputOne, inputOne + D, (Nw - D) * sizeof(t_float));
            memcpy(inputOne + (Nw - D), internalInputVector1, D * sizeof(t_float));
            memcpy(inputTwo, inputTwo + D, (Nw - D) * sizeof(t_float));
            memcpy(inputTwo + (Nw - D), internalInputVector2, D * sizeof(t_float));

            do_taint(x);

            for ( j = 0; j < D; j++ ){ internalOutputVector[j] = output[j] * mult; }
            memcpy(output, output + D, (Nw - D) * sizeof(t_float));
            for(j = (Nw-D); j < Nw; j++){ output[j] = 0.0; }
        }
        fft->operationCount = operationCount;
    }
    return w+7;
}

void taint_dsp(t_taint *x, t_signal **sp)
{
    int reset_required = 0;
    int maxvectorsize = sp[0]->s_n;
    int samplerate = sp[0]->s_sr;

    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;

    if(fft->R != samplerate || fft->MSPVectorSize != maxvectorsize || fft->initialized == 0){
        reset_required = 1;
    }
    if(!samplerate)
        return;

    if(fft->MSPVectorSize != maxvectorsize){
        fft->MSPVectorSize = maxvectorsize;
        fftease_set_fft_buffers(fft);
        fft2->MSPVectorSize = maxvectorsize;
        fftease_set_fft_buffers(fft2);
    }
    if(fft->R != samplerate ){
        fft->R = samplerate;
        fft2->R = samplerate;
    }
    if(reset_required){
        taint_init(x);
    }
    if(fftease_msp_sanity_check(fft,OBJECT_NAME)) {
        dsp_add(taint_perform, 6, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec,sp[3]->s_vec,
                sp[4]->s_vec);
    }
}
