/* FFTease for Pd */

#include "fftease.h"

static t_class *swinger_class;

#define OBJECT_NAME "swinger~"

typedef struct _swinger
{
    t_object x_obj;
    float x_f;
    t_fftease *fft;
    t_fftease *fft2;
    short mute;
} t_swinger;

static void swinger_dsp(t_swinger *x, t_signal **sp);
static t_int *swinger_perform(t_int *w);
static void *swinger_new(t_symbol *s, int argc, t_atom *argv);
static void swinger_mute(t_swinger *x, t_floatarg state);
static void swinger_init(t_swinger *x);
static void swinger_free(t_swinger *x);

void swinger_tilde_setup(void)
{
    t_class *c;
    c = class_new(gensym("swinger~"), (t_newmethod)swinger_new,
                  (t_method)swinger_free,sizeof(t_swinger), 0,A_GIMME,0);
    CLASS_MAINSIGNALIN(c, t_swinger, x_f);
    class_addmethod(c,(t_method)swinger_dsp,gensym("dsp"), A_CANT, 0);
    class_addmethod(c,(t_method)swinger_mute,gensym("mute"),A_FLOAT,0);
    swinger_class = c;
    fftease_announce(OBJECT_NAME);
}

void swinger_mute(t_swinger *x, t_floatarg state)
{
    x->mute = state;
}

void *swinger_new(t_symbol *s, int argc, t_atom *argv)
{
    t_fftease *fft, *fft2;
    t_swinger *x = (t_swinger *)pd_new(swinger_class);

    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;

    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 swinger_init(t_swinger *x)
{
    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;

    if(!fft->initialized){
        x->mute = 0;
    }
    fftease_init(fft);
    fftease_init(fft2);

}

static void do_swinger(t_swinger *x)
{
    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;
    int
    i,

    R,
    N,
    N2,
    D,
    Nw,

    even, odd;

    t_float
    a1, b1,
    a2, b2,
    *bufferOne,
    *bufferTwo,
    *channelOne,
    *channelTwo;
    bufferOne = fft->buffer;
    bufferTwo = fft2->buffer;
    R = fft->R;
    N = fft->N;
    N2 = fft->N2;
    D = fft->D;
    Nw = fft->Nw;
    channelOne = fft->channel;
    channelTwo = fft2->channel;


    /* 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);

    /* use redundant coding for speed, even though moving the invert variable
     comparison outside of the for loop will give us only a minimal performance
     increase (hypot and atan2 are the most intensive portions of this code).
     consider adding a table lookup for atan2 instead.
     */

    /* convert to polar coordinates from complex values */

    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) );

        /* replace signal one's phases with those of signal two */

        *(channelOne+even) = hypot( a1, b1 );
        *(channelOne+odd) = -atan2( b2, a2 );
    }

    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) );
    }


    /* do an inverse fft */

    fftease_rdft(fft,FFT_INVERSE);



    /* dewindow our result */

    fftease_overlapadd(fft);

    /* set our output and adjust our retaining output buffer */


}

t_int *swinger_perform(t_int *w)
{
    int i,j;
    t_swinger *x = (t_swinger *) (w[1]);
    t_float *MSPInputVector1 = (t_float *)(w[2]);
    t_float *MSPInputVector2 = (t_float *)(w[3]);
    t_float *MSPOutputVector = (t_float *)(w[4]);

    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;

    /* no computation if muted */

    if(x->mute){
        for(i=0; i < MSPVectorSize; i++){ MSPOutputVector[i] = 0.0; }
        return w+5;
    }

    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_swinger(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_swinger(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_swinger(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+5;
}

void swinger_free( t_swinger *x )
{
    fftease_free(x->fft);
    fftease_free(x->fft2);
    free(x->fft);
    free(x->fft2);
}

void swinger_dsp(t_swinger *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){
        swinger_init(x);
    }
    if(fftease_msp_sanity_check(fft,OBJECT_NAME)) {
        dsp_add(swinger_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec);
    }
}
