/* FFTease for Pd */

#include "fftease.h"

static t_class *resent_class;

#define OBJECT_NAME "resent~"


typedef struct _resent
{
    t_object x_obj;
    t_float x_f;
    t_fftease *fft;
    t_float *frame_incr;
    t_float *store_incr;
    t_float *frame_phase;
    t_float frameloc;
    t_float **loveboat;
    t_float current_frame;
    long framecount;
    long last_framecount;
    t_float frame_increment ;
    t_float fpos;
    t_float last_fpos;
    t_float tadv;
    int read_me;
    long frames_read;
    short mute;
    void *m_clock;
    void *m_bang;
    short playthrough;
    short lock;
    t_float duration;
    t_float sync;
    long interpolation_attr;
} t_resent;

static void resent_dsp(t_resent *x, t_signal **sp);
static t_int *resent_perform(t_int *w);
static void *resent_new(t_symbol *msg, short argc, t_atom *argv);
static void resent_acquire_sample (t_resent *x) ;
static void resent_mute(t_resent *x, t_floatarg tog);
static void resent_bin(t_resent *x, t_floatarg fbin, t_floatarg speed);
static void resent_setphase(t_resent *x, t_floatarg phase);
static void resent_addphase(t_resent *x, t_floatarg phase);
static void resent_setspeed( t_resent *x,  t_floatarg speed );
static void resent_addspeed( t_resent *x,  t_floatarg speed );
static void resent_free( t_resent *x );
static void resent_store_incr( t_resent *x );
static void resent_setspeed_and_phase( t_resent *x,  t_floatarg speed, t_floatarg phase );
static void resent_init(t_resent *x);
static void resent_linephase(t_resent *x, t_symbol *msg, short argc, t_atom *argv);
static void resent_linespeed(t_resent *x, t_symbol *msg, short argc, t_atom *argv);
static void resent_randphase(t_resent *x, t_symbol *msg, short argc, t_atom *argv);
static void resent_randspeed(t_resent *x, t_symbol *msg, short argc, t_atom *argv);
static void resent_playthrough(t_resent *x, t_floatarg state);
static void resent_interpolation(t_resent *x,  t_floatarg tog);
t_float fftease_randf(t_float min, t_float max);
static void resent_transpose(t_resent *x, t_floatarg tf);
static void resent_synthresh(t_resent *x, t_floatarg thresh);
static void resent_oscbank(t_resent *x, t_floatarg flag);
static void resent_assist (t_resent *x, void *b, long msg, long arg, char *dst);
static void resent_tick(t_resent *x);

void resent_tilde_setup(void)
{
    t_class *c;
    c = class_new(gensym("resent~"), (t_newmethod)resent_new,
                  (t_method)resent_free,sizeof(t_resent), 0,A_GIMME,0);
    CLASS_MAINSIGNALIN(c, t_resent, x_f);
    class_addmethod(c,(t_method)resent_dsp,gensym("dsp"), A_CANT, 0);
    class_addmethod(c,(t_method)resent_mute,gensym("mute"),A_FLOAT,0);
    class_addmethod(c,(t_method)resent_oscbank,gensym("oscbank"),A_FLOAT,0);
    class_addmethod(c,(t_method)resent_transpose,gensym("transpose"),A_FLOAT,0);
    class_addmethod(c,(t_method)resent_synthresh,gensym("synthresh"),A_FLOAT,0);
    class_addmethod(c,(t_method)resent_acquire_sample,gensym("acquire_sample"), 0);
    class_addmethod(c,(t_method)resent_linespeed, gensym("linespeed"), A_GIMME, 0);
    class_addmethod(c,(t_method)resent_linephase, gensym("linephase"), A_GIMME, 0);
    class_addmethod(c,(t_method)resent_randspeed, gensym("randspeed"), A_GIMME, 0);
    class_addmethod(c,(t_method)resent_randphase, gensym("randphase"), A_GIMME, 0);
    class_addmethod(c,(t_method)resent_bin, gensym("bin"), A_FLOAT, A_FLOAT, 0);
    class_addmethod(c,(t_method)resent_setphase, gensym("setphase"),  A_FLOAT, 0);
    class_addmethod(c,(t_method)resent_addphase, gensym("addphase"),  A_FLOAT, 0);
    class_addmethod(c,(t_method)resent_setspeed, gensym("setspeed"),  A_FLOAT, 0);
    class_addmethod(c,(t_method)resent_addspeed, gensym("addspeed"),  A_FLOAT, 0);
    class_addmethod(c,(t_method)resent_playthrough, gensym("playthrough"),  A_DEFFLOAT, 0);
    class_addmethod(c,(t_method)resent_store_incr, gensym("store_incr"),0);
    class_addmethod(c,(t_method)resent_setspeed_and_phase, gensym("setspeed_and_phase"),  A_FLOAT, A_FLOAT, 0);
    class_addmethod(c,(t_method)resent_interpolation, gensym("interpolation"), A_FLOAT, 0);
    resent_class = c;
    fftease_announce(OBJECT_NAME);
}

void resent_transpose(t_resent *x, t_floatarg tf)
{
    x->fft->P = tf;
}

void resent_synthresh(t_resent *x, t_floatarg thresh)
{
    x->fft->synt = thresh;
}

void resent_oscbank(t_resent *x, t_floatarg flag)
{
    x->fft->obank_flag = (short) flag;
}

void resent_store_incr(t_resent *x)
{
    t_fftease *fft = x->fft;

    int i;
    t_float *store_incr = x->store_incr;
    t_float *frame_incr = x->frame_incr;

    for(i = 0; i < fft->N2; i++){
        store_incr[i] = frame_incr[i];
    }
}

void resent_free(t_resent *x){
    int i ;

    if(x->fft->initialized){
        for(i = 0; i < x->framecount; i++){
            free(x->loveboat[i]) ;
        }
        free(x->loveboat);
        free(x->frame_phase);
        free(x->frame_incr);
        free(x->store_incr);
    }
    fftease_free(x->fft);
    free(x->fft);
}

void resent_bin(t_resent *x, t_floatarg fbin, t_floatarg speed)
{
    t_fftease *fft = x->fft;

    int bin_num = (int) fbin;

    if(bin_num >= 0 && bin_num < fft->N2){
        x->frame_incr[bin_num] = speed ;
    } else {
        post("resent~: bin %d is out of range", bin_num);
    }
}

void resent_setphase( t_resent *x,  t_floatarg phase)
{
    t_fftease *fft = x->fft;

    t_float scaled_phase;
    int i;

    if( phase < 0. )
        phase = 0. ;
    if( phase > 1. )
        phase = 1.;
    scaled_phase = phase * (t_float) x->framecount ;
    for( i = 0; i < fft->N2; i++ ){
        x->frame_phase[i] = scaled_phase ;
    }

}

void resent_addphase( t_resent *x,  t_floatarg phase )
{
    t_fftease *fft = x->fft;

    t_float scaled_phase ;
    t_float *frame_phase = x->frame_phase;
    int framecount =  x->framecount;
    int i;


    if( phase < 0. )
        phase = 0. ;
    if( phase > 1. )
        phase = 1.;
    scaled_phase = phase * (t_float) framecount ;
    for( i = 0; i < fft->N2; i++ ){
        frame_phase[i] += scaled_phase ;
        while( frame_phase[i] < 0 )
            frame_phase[i] += framecount;
        while( frame_phase[i] > framecount - 1 )
            frame_phase[i] -= framecount ;
    }


}

void resent_setspeed( t_resent *x,  t_floatarg speed )
{
    t_fftease *fft = x->fft;
    if(! x->fft->init_status)
        return;

    int i;

    for( i = 0; i < fft->N2; i++ ){

        x->frame_incr[i] = speed ;
    }
    // post("speed reset to %f",speed);
}

void resent_addspeed( t_resent *x,  t_floatarg speed )
{
    t_fftease *fft = x->fft;

    int i;
    t_float *store_incr = x->store_incr;
    t_float *frame_incr = x->frame_incr;

    for( i = 0; i < fft->N2; i++ ){
        frame_incr[i] = store_incr[i] + speed ;
    }
}

void resent_interpolation( t_resent *x,  t_floatarg tog )
{
    x->interpolation_attr = (int) tog;
}

void resent_setspeed_and_phase( t_resent *x,  t_floatarg speed, t_floatarg phase )
{
    t_fftease *fft = x->fft;

    t_float scaled_phase;
    int i;
    if( phase < 0. )
        phase = 0. ;
    if( phase > 1. )
        phase = 1.;

    scaled_phase = phase * (t_float) x->framecount ;
    for( i = 0; i < fft->N2; i++ ){
        x->frame_phase[i] = scaled_phase ;
        x->frame_incr[i] = speed ;
    }
    //  post("ssap: speed reset to %f, phase reset to %f",speed,phase);

}

void resent_assist (t_resent *x, void *b, long msg, long arg, char *dst)
{
    if (msg==1) {
        switch (arg) {
            case 0:
                sprintf(dst,"(signal/bang) Input, Sample Trigger");
                break;
        }
    } else if (msg==2) {
        switch( arg){
            case 0:
                sprintf(dst,"(signal) Output ");
                break;
            case 1:
                sprintf(dst,"(signal) Recording Sync");
                break;
        }

    }
}

void resent_tick(t_resent *x) {
    outlet_bang(x->m_bang);
}

void resent_init(t_resent *x)
{
    int i;
    short initialized = x->fft->initialized;
    t_fftease  *fft = x->fft;
    fftease_init(fft);
    if(!fftease_msp_sanity_check(fft,OBJECT_NAME)){
        return;
    }

    x->current_frame = x->framecount = 0;
    x->fpos = x->last_fpos = 0;
    x->tadv = (t_float)fft->D/(t_float)fft->R;
    if(x->duration < 0.1){
        x->duration = 0.1;
    }
    x->framecount =  x->duration/x->tadv ;
    x->read_me = 0;

    if(! initialized ){
        x->frame_increment = 1.0 ;
        x->mute = 0;
        x->playthrough = 0;
        x->sync = 0;
        x->frames_read = 0;
        x->frame_incr = (t_float *) calloc(fft->N2, sizeof(t_float));
        x->store_incr = (t_float *) calloc(fft->N2, sizeof(t_float));
        x->frame_phase = (t_float *) calloc(fft->N2, sizeof(t_float));
        x->loveboat = (t_float **) calloc(x->framecount, sizeof(t_float *));
        for(i=0; i < x->framecount; i++){
            x->loveboat[i] = (t_float *) calloc((fft->N+2), sizeof(t_float));
            if(x->loveboat[i] == NULL){
                pd_error(0, "%s: Insufficient Memory!",OBJECT_NAME);
                return;
            }
        }
    }
    else { /* this could fail or might not actually release memory - test it!! */
        x->frame_incr = (t_float *) realloc(x->frame_incr, fft->N2 * sizeof(t_float));
        x->store_incr = (t_float *) realloc(x->store_incr, fft->N2 * sizeof(t_float));
        x->frame_phase = (t_float *) realloc(x->frame_phase, fft->N2 * sizeof(t_float));

        for(i = 0; i < x->last_framecount; i++){
            free(x->loveboat[i]) ;
        }
        x->loveboat = (t_float **)realloc(x->loveboat, x->framecount * sizeof(t_float*));
        for(i=0; i < x->framecount; i++){
            x->loveboat[i] = (t_float *) calloc((fft->N+2), sizeof(t_float));
            if(x->loveboat[i] == NULL){
                pd_error(0, "%s: Insufficient Memory!",OBJECT_NAME);
                return;
            }
        }
    }
    x->last_framecount = x->framecount;
}

void *resent_new(t_symbol *msg, short argc, t_atom *argv)
{
t_fftease *fft;
    t_resent *x = (t_resent *)pd_new(resent_class);


    outlet_new(&x->x_obj, gensym("signal"));
    outlet_new(&x->x_obj, gensym("signal"));
    x->fft = (t_fftease *) calloc(1, sizeof(t_fftease) );
    fft = x->fft;
    fft->initialized = 0;

    srand(clock()); // needed ?
    x->interpolation_attr = 0;

    fft->N = FFTEASE_DEFAULT_FFTSIZE;
    fft->overlap = FFTEASE_DEFAULT_OVERLAP;
    fft->winfac = FFTEASE_DEFAULT_WINFAC;
    if(argc > 0){ x->duration = atom_getfloatarg(0, argc, argv) / 1000.0; }
    else { post("%s: must give duration argument",OBJECT_NAME); return NULL; }
    if(argc > 1){ fft->N = (int) atom_getfloatarg(1, argc, argv); }
    if(argc > 2){ fft->overlap = (int) atom_getfloatarg(2, argc, argv); }
    return x;
}

static void do_resent(t_resent *x)
{
    t_fftease *fft = x->fft;

    int iphase, amp, freq, i;
    int N = fft->N;
    int N2 = fft->N2;
    t_float fframe = x->current_frame ;
    t_float last_fpos = x->last_fpos ;
    int framecount = x->framecount;
    t_float *frame_incr = x->frame_incr;
    t_float *frame_phase = x->frame_phase;
    t_float *channel = fft->channel;
    t_float frak;
    long iphase1, iphase2;

    if(x->read_me && x->framecount > 0){

        fftease_fold(fft);
        fftease_rdft(fft,FFT_FORWARD);
        fftease_convert(fft);
        // use memcopy
        for(i = 0; i < N; i++){
            x->loveboat[x->frames_read][i] = channel[i];
        }
        x->frames_read++;
        if(x->frames_read >= x->framecount){
            x->read_me = 0;
            // post("sample acquisition completed");
        }
        x->sync = (t_float) x->frames_read / (t_float) x->framecount;
    }
    else {
        if(x->interpolation_attr == 1){
            for( i = 0 ; i < N2; i++ ){
                amp = i<<1;
                freq = amp + 1;
                iphase1 = floor( frame_phase[i] );
                frak = frame_phase[i] - iphase1;
                if( iphase1 < 0 )
                    iphase1 = 0;
                if( iphase1 > framecount - 1 )
                    iphase1 = framecount - 1;
                iphase2 = (iphase1 + 1) % framecount;
                channel[amp] = x->loveboat[iphase1][amp] + (frak *
                    (x->loveboat[iphase2][amp] - x->loveboat[iphase1][amp]));
                channel[freq] = x->loveboat[iphase1][freq] + (frak *
                    (x->loveboat[iphase2][freq] - x->loveboat[iphase1][freq]));
                frame_phase[i] += frame_incr[i] ;
                while( frame_phase[i] > framecount - 1)
                    frame_phase[i] -= framecount;
                while( frame_phase[i] < 0. )
                    frame_phase[i] += framecount;
            }
        }
        else {
            for( i = 0 ; i < N2; i++ ){
                amp = i<<1;
                freq = amp + 1 ;
                iphase = frame_phase[i];
                if( iphase < 0 )
                    iphase = 0;
                if( iphase > framecount - 1 )
                    iphase = framecount - 1;
                channel[amp] = x->loveboat[iphase][amp];
                channel[freq] = x->loveboat[iphase][freq];
                frame_phase[i] += frame_incr[i] ;
                while( frame_phase[i] > framecount - 1)
                    frame_phase[i] -= framecount;
                while( frame_phase[i] < 0. )
                    frame_phase[i] += framecount;
            }
        }
        if(fft->obank_flag){
            fftease_oscbank(fft);
        } else {
            fftease_unconvert(fft);
            fftease_rdft(fft,FFT_INVERSE);
            fftease_overlapadd(fft);
        }
    }

    /* restore state variables */

    x->current_frame = fframe;
    x->last_fpos = last_fpos;

}

t_int *resent_perform(t_int *w)
{
    int i, j;
    //////////////////////////////////////////////
    t_resent *x = (t_resent *) (w[1]);
    t_float *MSPInputVector = (t_float *)(w[2]);
    t_float *MSPOutputVector = (t_float *)(w[3]);
    t_float *sync_vec = (t_float *)(w[4]);

    /* dereference structure */

    t_fftease *fft = x->fft;
    int D = fft->D;
    int Nw = fft->Nw;
    t_float *input = fft->input;
    t_float *output = fft->output;
    t_float mult = fft->mult;
    int MSPVectorSize = fft->MSPVectorSize;
    t_float *internalInputVector = fft->internalInputVector;
    t_float *internalOutputVector = fft->internalOutputVector;
    int operationRepeat = fft->operationRepeat;
    int operationCount = fft->operationCount;


    if(x->mute){
        for(i=0; i < MSPVectorSize; i++){ MSPOutputVector[i] = 0.0; }
        for(i=0; i < MSPVectorSize; i++){ sync_vec[i] = 0.0; }
        return w+5;
    }
    if( fft->obank_flag )
        mult *= FFTEASE_OSCBANK_SCALAR;
    if(x->playthrough && x->read_me){
        for (i = 0; i < MSPVectorSize; i++) {
            MSPOutputVector[i] = MSPInputVector[i] * 0.5; // scale down
        }
        for(i=0; i < MSPVectorSize; i++){ sync_vec[i] = 0.0; }
        return w+5;
    }

    if( fft->bufferStatus == EQUAL_TO_MSP_VECTOR ){
        memcpy(input, input + D, (Nw - D) * sizeof(t_float));
        memcpy(input + (Nw - D), MSPInputVector, D * sizeof(t_float));

        do_resent(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(input, input + D, (Nw - D) * sizeof(t_float));
            memcpy(input + (Nw-D), MSPInputVector + (D*i), D * sizeof(t_float));

            do_resent(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(internalInputVector + (operationCount * MSPVectorSize), MSPInputVector,MSPVectorSize * sizeof(t_float));
        memcpy(MSPOutputVector, internalOutputVector + (operationCount * MSPVectorSize),MSPVectorSize * sizeof(t_float));
        operationCount = (operationCount + 1) % operationRepeat;

        if( operationCount == 0 ) {
            memcpy(input, input + D, (Nw - D) * sizeof(t_float));
            memcpy(input + (Nw - D), internalInputVector, D * sizeof(t_float));

            do_resent(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;
    }
    for ( i = 0; i < MSPVectorSize; i++ ){
        sync_vec[i] = x->sync;
    }
    return w+5;
}

void resent_acquire_sample(t_resent *x)
{
    x->read_me = 1;
    x->frames_read = 0;
    return;
}

void resent_mute(t_resent *x, t_floatarg tog)
{
    x->mute = tog;
}

void resent_playthrough(t_resent *x, t_floatarg state)
{
    x->playthrough = state;
}

void resent_linephase(t_resent *x, t_symbol *msg, short argc, t_atom *argv)
{
    t_fftease *fft = x->fft;
    int bin1, bin2;
    t_float phase1, phase2, bindiff;
    int i;
    t_float m1, m2;

    bin1 = (int) atom_getfloatarg(0, argc, argv);
    phase1 = atom_getfloatarg(1, argc, argv) * x->framecount;
    bin2 = (int) atom_getfloatarg(2, argc, argv);
    phase2 = atom_getfloatarg(3, argc, argv) * x->framecount;

    if( bin1 > fft->N2 || bin2 > fft->N2 ){
        pd_error(0, "too high bin number");
        return;
    }
    bindiff = bin2 - bin1;
    if( bindiff < 1 ){
        pd_error(0, "make bin2 higher than bin 1, bye now");
        return;
    }
    for( i = bin1; i < bin2; i++ ){
        m2 = (t_float) i / bindiff;
        m1 = 1. - m2;
        x->frame_phase[i] = m1 * phase1 + m2 * phase2;
    }
}

void resent_randphase(t_resent *x, t_symbol *msg, short argc, t_atom *argv)
{
    t_fftease *fft = x->fft;

    t_float minphase, maxphase;
    int i;
    int framecount = x->framecount;

    minphase = atom_getfloatarg(0, argc, argv);
    maxphase = atom_getfloatarg(1, argc, argv);

    //  post("minphase %f maxphase %f",minphase, maxphase);
    if(minphase < 0.0)
        minphase = 0.0;
    if( maxphase > 1.0 )
        maxphase = 1.0;

    for( i = 0; i < fft->N2; i++ ){
        x->frame_phase[i] = (int) (fftease_randf( minphase, maxphase ) * (t_float) (framecount - 1) ) ;
    }
}

void resent_randspeed(t_resent *x, t_symbol *msg, short argc, t_atom *argv)
{
    t_fftease *fft = x->fft;

    t_float minspeed, maxspeed;
    int i;


    minspeed = atom_getfloatarg(0, argc, argv);
    maxspeed = atom_getfloatarg(1, argc, argv);

    for( i = 0; i < fft->N2; i++ ){
        x->frame_incr[i] = fftease_randf(minspeed, maxspeed);
    }
}

void resent_linespeed(t_resent *x, t_symbol *msg, short argc, t_atom *argv)
{
    t_fftease *fft = x->fft;
    int bin1, bin2;
    t_float speed1, speed2, bindiff;
    int i;
    t_float m1, m2;

    bin1 = (int) atom_getfloatarg(0, argc, argv);
    speed1 = atom_getfloatarg(1, argc, argv);
    bin2 = (int) atom_getfloatarg(2, argc, argv);
    speed2 = atom_getfloatarg(3, argc, argv);

    if( bin1 > fft->N2 || bin2 > fft->N2 ){
        pd_error(0, "too high bin number");
        return;
    }
    bindiff = bin2 - bin1;
    if( bindiff < 1 ){
        pd_error(0, "make bin2 higher than bin 1, bye now");
        return;
    }
    for( i = bin1; i < bin2; i++ ){
        m2 = (t_float) i / bindiff;
        m1 = 1. - m2;
        x->frame_incr[i] = m1 * speed1 + m2 * speed2;
    }
}

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

    if(!samplerate)
        return;
    t_fftease *fft = x->fft;
    if(fft->R != samplerate || fft->MSPVectorSize != maxvectorsize || fft->initialized == 0){
        reset_required = 1;
    }
    if(fft->MSPVectorSize != maxvectorsize){
        fft->MSPVectorSize = maxvectorsize;
        fftease_set_fft_buffers(fft);
    }
    if(fft->R != samplerate){
        fft->R = samplerate;
    }
    if(reset_required){
        resent_init(x);
    }
    if(fftease_msp_sanity_check(fft,OBJECT_NAME)) {
        dsp_add(resent_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec);
    }
}