/* FFTease for Pd */

#include "fftease.h"

static t_class *dentist_class;

#define OBJECT_NAME "dentist~"

typedef struct _dentist
{
    t_object x_obj;
    float x_f;
    t_fftease *fft;
    short *bin_selection;
    short *last_bin_selection;
    int *active_bins;
    int tooth_count;
    int ramp_frames;
    int frames_left;
    t_float frame_duration;
    int max_bin;
    t_float topfreq;
    t_float funda;
    void *list_outlet;
    short direct_update;
    short mute;
    t_atom *list_data;
    short interpolate_singles;
    t_float sync;
    t_float ramp_ms;

} t_dentist;

static void *dentist_new(t_symbol *msg, short argc, t_atom *argv);
static void dentist_dsp(t_dentist *x, t_signal **sp);
static t_int *dentist_perform(t_int *w);
static void reset_shuffle(t_dentist *x);
static void dentist_showstate(t_dentist *x);
static void dentist_mute(t_dentist *x, t_floatarg toggle);
static void dentist_setstate(t_dentist *x, t_symbol *msg, short argc, t_atom *argv);
static void dentist_ramptime(t_dentist *x, t_floatarg ramp_ms);
static int rand_index(int max);
static void dentist_init(t_dentist *x);
static void dentist_topfreq(t_dentist *x, t_floatarg f);
static void dentist_free(t_dentist *x);
static void dentist_toothcount(t_dentist *x, t_floatarg newcount);
static void dentist_scramble(t_dentist *x);
static void dentist_interpolate_singles(t_dentist *x, t_floatarg f);
static void dentist_fftinfo(t_dentist *x);
static void dentist_mute(t_dentist *x, t_floatarg toggle);
static void dentist_activate_bins(t_dentist *x, t_floatarg f);
static void dentist_bins_pd (t_dentist *x, t_floatarg i);
static void dentist_direct_update( t_dentist *x, t_floatarg toggle);
static void dentist_fftsize(t_dentist *x, t_floatarg f);
static void dentist_overlap(t_dentist *x, t_floatarg f);
static void dentist_winfac(t_dentist *x, t_floatarg f);

void dentist_tilde_setup(void)
{
    t_class *c;
    c = class_new(gensym("dentist~"), (t_newmethod)dentist_new,
                  (t_method)dentist_free,sizeof(t_dentist), 0,A_GIMME,0);
    CLASS_MAINSIGNALIN(c, t_dentist, x_f);
    class_addmethod(c,(t_method)dentist_dsp,gensym("dsp"), A_CANT, 0);
    class_addmethod(c,(t_method)dentist_mute,gensym("mute"),A_FLOAT,0);
    class_addmethod(c,(t_method)dentist_fftinfo,gensym("fftinfo"),0);
    class_addmethod(c,(t_method)dentist_showstate,gensym("showstate"),0);
    class_addmethod(c,(t_method)dentist_setstate, gensym("setstate"), A_GIMME, 0);
    class_addmethod(c,(t_method)dentist_ramptime, gensym("ramptime"), A_FLOAT, 0);
    class_addmethod(c,(t_method)dentist_topfreq, gensym("topfreq"), A_FLOAT, 0);
    class_addmethod(c,(t_method)dentist_toothcount, gensym("toothcount"), A_FLOAT, 0);
    class_addmethod(c,(t_method)dentist_interpolate_singles, gensym("interpolate_singles"), A_FLOAT, 0);
    class_addmethod(c,(t_method)dentist_scramble, gensym("scramble"), 0);

    dentist_class = c;
    fftease_announce(OBJECT_NAME);
}


void dentist_interpolate_singles(t_dentist *x, t_floatarg f)
{
    x->interpolate_singles = (short)f;
    //    post("singles interp: %d",x->interpolate_singles);
}

void dentist_free(t_dentist *x)
{
    fftease_free(x->fft);
    free(x->fft);
    free(x->bin_selection);
    free(x->active_bins);
    free(x->last_bin_selection);
    free(x->list_data);
}

void dentist_fftsize(t_dentist *x, t_floatarg f)
{
    t_fftease *fft = x->fft;
    fft->N = (int) f;
    dentist_init(x);
}

void dentist_overlap(t_dentist *x, t_floatarg f)
{
    x->fft->overlap = (int) f;
    dentist_init(x);
}

void dentist_winfac(t_dentist *x, t_floatarg f)
{
    t_fftease *fft = x->fft;
    fft->winfac = (int) f;
    dentist_init(x);
}

void dentist_fftinfo( t_dentist *x )
{
    fftease_fftinfo( x->fft, OBJECT_NAME );
}


void dentist_direct_update( t_dentist *x, t_floatarg toggle)
{
    x->direct_update = (short)toggle;
}

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

void *dentist_new(t_symbol *msg, short argc, t_atom *argv)
{
    t_fftease *fft;
    t_dentist *x = (t_dentist *)pd_new(dentist_class);

    outlet_new(&x->x_obj, gensym("signal"));
    outlet_new(&x->x_obj, gensym("signal"));
    x->list_outlet = outlet_new(&x->x_obj, gensym("list"));

    x->fft = (t_fftease *) calloc(1,sizeof(t_fftease));
    fft = x->fft;
    fft->initialized = 0;

    x->topfreq = 3000; // an attribute candidate
    x->ramp_ms = 1000.0;
    x->tooth_count = 3;
    fft->N = FFTEASE_DEFAULT_FFTSIZE;
    fft->overlap = FFTEASE_DEFAULT_OVERLAP;
    fft->winfac = FFTEASE_DEFAULT_WINFAC;
    if(argc > 0){ fft->N = (int) atom_getfloatarg(0, argc, argv); }
    if(argc > 1){ fft->overlap = (int) atom_getfloatarg(1, argc, argv); }

    return x;
}

void dentist_topfreq(t_dentist *x, t_floatarg f)
{
    float funda = x->funda;
    float curfreq;
    t_fftease *fft = x->fft;
    if(f < 50 || f > fft->R/2.0)
        return;

    x->topfreq = f;
    if(! x->fft->initialized){
        return;
    }
    x->max_bin = 1;
    curfreq = 0;
    while(curfreq < x->topfreq) {
        ++(x->max_bin);
        curfreq += funda ;
    }
}

void dentist_init(t_dentist *x)
{
    int i;
    t_fftease *fft = x->fft;
    short initialized = fft->initialized;
    fftease_init(fft);

    if(!initialized){
        x->sync = 0;
        x->mute = 0;
        x->direct_update = 0;
        if(x->topfreq < 100)
            x->topfreq = 100.0;
        x->bin_selection = (short *) calloc(fft->N, sizeof(short));
        x->active_bins = (int *) calloc(fft->N2, sizeof(int));
        x->last_bin_selection = (short *) calloc(fft->N2, sizeof(short)) ;
        x->list_data = (t_atom *) calloc((fft->N + 2), sizeof(t_atom));

        x->interpolate_singles = 1;
        x->ramp_frames = 0;

    } else {
        x->bin_selection = (short *) realloc((void *)x->bin_selection, fft->N * sizeof(short));
        x->active_bins = (int *) realloc((void *)x->active_bins, fft->N2 * sizeof(int));
        x->last_bin_selection = (short *) realloc((void *)x->last_bin_selection, fft->N2 * sizeof(short)) ;
        x->list_data = (t_atom *) realloc((void *)x->list_data, (fft->N + 2) * sizeof(t_atom));
    }

    dentist_scramble(x);

    fft->mult = 1. / (t_float) fft->N;
    x->frame_duration = (t_float) fft->D / (t_float) fft->R;
    x->frames_left = x->ramp_frames = (int)(x->ramp_ms * .001 / x->frame_duration);
    x->funda = (t_float) fft->R / (t_float) fft->N;
    x->max_bin = 1;

    if(!x->funda){
        error("%s: zero sampling rate!",OBJECT_NAME);
        return;
    }
    x->max_bin = (int) (x->topfreq / x->funda);
    if(x->max_bin < 1)
        x->max_bin = 1;

    for( i = 0; i < fft->N2; i++) {
        x->last_bin_selection[i] = x->bin_selection[i];
    }
    dentist_toothcount(x, x->tooth_count);
}

static void do_dentist(t_dentist *x)
{
    int i;
    t_float oldfrac,newfrac;
    t_fftease *fft = x->fft;
    t_float *channel = fft->channel;
    int frames_left = x->frames_left;
    int ramp_frames = x->ramp_frames;
    short *bin_selection = x->bin_selection;
    short *last_bin_selection = x->last_bin_selection;
    int N2 = fft->N2;
    float sync = x->sync;

    fftease_fold(fft);
    fftease_rdft(fft,1);
    fftease_leanconvert(fft);

    if(frames_left > 0 && ramp_frames > 0) {
        // INTERPOLATE ACCORDING TO POSITION IN RAMP
        oldfrac = (float) frames_left / (float) ramp_frames ;
        sync = newfrac = 1.0 - oldfrac;
        for( i = 0; i < N2 ; i++){
            if( (! bin_selection[i]) && (! last_bin_selection[i]) ){
                channel[i * 2]  = 0;
            }
            else if (bin_selection[i]) {
                channel[i * 2]  *= newfrac;
            }
            else if (last_bin_selection[i]) {
                channel[i * 2]  *= oldfrac;
            }
        }
        --frames_left;
        if( ! frames_left ){
            // Copy current to last
            for( i = 0; i < N2; i++) {
                last_bin_selection[i] = bin_selection[i];
            }
        }
    } else {
        for( i = 0; i < N2 ; i++){
            if( ! bin_selection[ i ] ){
                channel[ i * 2 ]  = 0;
            }
        }
        oldfrac = 0.0;
        sync = 1.0;
    }

    fftease_leanunconvert(fft);
    fftease_rdft(fft,-1);
    fftease_overlapadd(fft);
    x->frames_left = frames_left;
    x->sync = sync;
}

t_int *dentist_perform(t_int *w)
{
    int i,j;
    t_dentist *x = (t_dentist *) (w[1]);
    t_float *MSPInputVector = (t_float *)(w[2]);
    t_float *MSPOutputVector = (t_float *)(w[3]);
    t_float *sync_vec = (t_float *)(w[4]);
    t_fftease *fft = x->fft;
    t_float *input = fft->input;
    int D = fft->D;
    int Nw = fft->Nw;
    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->bufferStatus == EQUAL_TO_MSP_VECTOR ){
        memcpy(input, input + D, (Nw - D) * sizeof(t_float));
        memcpy(input + (Nw - D), MSPInputVector, D * sizeof(t_float));

        do_dentist(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_dentist(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_dentist(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 set_switch_bins (t_dentist *x, int i)
{
    if( i < 0 ){
        i = 0;
    }
    if( i > x->fft->N2 ) {
        i = x->fft->N2;
    }
    x->tooth_count = i;
    if( x->direct_update ){
        reset_shuffle(x);
    }
    return;
}
//identical function for Pd
void dentist_bins_pd (t_dentist *x, t_floatarg i)
{
    if( i < 0 ){
        i = 0;
    }
    if( i > x->fft->N2 ) {
        i = x->fft->N2;
    }
    x->tooth_count = (int)i;
    if(x->direct_update){
        reset_shuffle(x);
    }
    return;
}

// experimental, not to be used
void dentist_activate_bins(t_dentist *x, t_floatarg f)
{
    if(f < 0 || f > x->max_bin){
        post("* %d bin out of range",(int)f);
        return;
    }
    x->tooth_count = (int)f;
}

void dentist_scramble(t_dentist *x)
{
    short *last_bin_selection = x->last_bin_selection;
    short *bin_selection = x->bin_selection;
    int *active_bins = x->active_bins;
    int N2 = x->fft->N2;
    int i,tmp,b1,b2;
    int maxswap = x->max_bin;

    if(!x->fft->initialized){
        return;
    }
    for(i=0; i<N2; i++){
        bin_selection[i] = 0;
        active_bins[i] = i;
    }
    while(maxswap > 0){
        b1 = maxswap;
        b2 = rand_index(maxswap);
        tmp = active_bins[b1];
        active_bins[b1] = active_bins[b2];
        active_bins[b2] = tmp;
        --maxswap;
    }
    for( i = 0; i < x->tooth_count; i++ ) {
        x->bin_selection[active_bins[i]] = 1;
    }
    x->frames_left = x->ramp_frames;
    if(! x->ramp_frames) {
        for(i = 0; i < N2; i++){
            last_bin_selection[i] = bin_selection[i];
        }
    }
}



void dentist_toothcount(t_dentist *x, t_floatarg newcount)
{
    int i;
    int nc = (int) newcount;
    int tooth_count = x->tooth_count;
    if(! x->fft->initialized){
        x->tooth_count = newcount;
        return;
    }
    if(nc < 0 || nc > x->fft->N2){
        error("dentist~: %d out of range",nc);
        return;
    }

    if(nc < x->tooth_count){
        for(i = nc; i < tooth_count; i++){
            x->bin_selection[x->active_bins[i]] = 0;
        }
    }
    else {
        for(i = tooth_count; i < nc; i++){
            x->bin_selection[x->active_bins[i]] = 1;
        }
    }
    // if immediate reset
    if(x->interpolate_singles){
        //  post("setting frames left");
        x->frames_left = x->ramp_frames;
    }
    if(! x->ramp_frames) {
        for(i = 0; i < x->fft->N2; i++){
            x->last_bin_selection[i] = x->bin_selection[i];
        }
    }
    x->tooth_count = nc;
}


void reset_shuffle (t_dentist *x)
{
    int i;
    int max;

    max = x->max_bin;
    for(i = 0; i < x->fft->N2; i++){
        x->last_bin_selection[i] = x->bin_selection[i];
        x->bin_selection[i] = 0;
    }
    for(i = 0; i < x->max_bin; i++) {
        x->active_bins[i] = rand_index(max);
        x->bin_selection[x->active_bins[i]] = 1;
    }
    x->frames_left = x->ramp_frames;
    if(! x->ramp_frames) { // Ramp Off - Immediately set last to current
        for( i = 0; i < x->fft->N2; i++ ){
            x->last_bin_selection[ i ] = x->bin_selection[ i ];
        }
    }
}

int rand_index(int max) {
    return (rand() % max);
}

void dentist_setstate (t_dentist *x, t_symbol *msg, short argc, t_atom *argv) {
    short i;
    int selex;

    short *last_bin_selection = x->last_bin_selection;
    short *bin_selection = x->bin_selection;
    int *active_bins = x->active_bins;
    x->tooth_count = argc;
    int N2 = x->fft->N2;

    for(i = 0; i < N2; i++){
        last_bin_selection[i] = bin_selection[i]; // needed here
        bin_selection[i] = 0;
    }

    for (i=0; i < argc; i++) {
        selex = atom_getfloatarg(i,argc,argv);
        if (selex < N2 && selex >= 0 ) {
            active_bins[i] = selex;
            bin_selection[selex] = 1;
        } else {
            post ("%d out of range bin",selex);
        }
    }


    x->frames_left = x->ramp_frames;
    if(! x->ramp_frames) { // Ramp Off - Immediately set last to current
        for(i = 0; i < N2; i++){
            last_bin_selection[i] = bin_selection[i];
        }
    }

    return;
}
void dentist_ramptime (t_dentist *x, t_floatarg ramp_ms) {

    if(ramp_ms <= 0){
        return;
    }
    x->ramp_ms = ramp_ms;
    if(!x->fft->initialized){
        return;
    }
    x->frames_left = x->ramp_frames = (int)(x->ramp_ms * .001 / x->frame_duration);
    return;
}
// REPORT CURRENT SHUFFLE STATUS
void dentist_showstate (t_dentist *x) {

    t_atom *list_data = x->list_data;

    short i, count;
    float data;

    count = 0;
    for(i = 0; i < x->tooth_count; i++ ) {
        data = x->active_bins[i];
        SETFLOAT(list_data+count,(t_float)x->active_bins[i]);
        ++count;
    }
    outlet_list(x->list_outlet,0,x->tooth_count,list_data);
    return;
}

void dentist_dsp(t_dentist *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){
        dentist_init(x);
    }
    if(fftease_msp_sanity_check(fft,OBJECT_NAME)) {
        dsp_add(dentist_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec);
    }
}
