/* FFTease for Pd */

#include "fftease.h"

static t_class *residency_class;

#define OBJECT_NAME "residency~"

typedef struct _residency
{
    t_object x_obj;
    t_float x_f;
    t_fftease *fft;
    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;
    short acquire_stop; // flag to stop recording immediately
    t_float force_pos; // force to this position on receiving message
    int read_me;
    int frames_read;
    short mute;
    short playthrough;
    t_float duration;
    short lock;
    short verbose;
    short override;
    t_float *input_vec;
    t_float sync;
    short failed_init; // flag to check if init failed due to bad data from Max
    t_float size_attr;
    short interpolation_attr;
} t_residency;

static void residency_dsp(t_residency *x, t_signal **sp);
static t_int *residency_perform(t_int *w);
static void *residency_new(t_symbol *s, int argc, t_atom *argv);
static void residency_playthrough( t_residency *x, t_floatarg tog) ;
static void residency_mute(t_residency *x, t_floatarg tog);
static void residency_interpolation(t_residency *x, t_floatarg tog);
static void residency_free(t_residency *x);
static void residency_init(t_residency *x);
static void residency_force_position(t_residency *x, t_floatarg position);
static void residency_acquire_sample(t_residency *x);
static void residency_acquire_stop(t_residency *x);
static void residency_transpose(t_residency *x, t_floatarg tf);
static void residency_synthresh(t_residency *x, t_floatarg thresh);
static void residency_oscbank(t_residency *x, t_floatarg flag);
static void residency_meminfo( t_residency *x );
static void residency_size( t_residency *x, t_floatarg newsize);
static void residency_verbose( t_residency *x, t_floatarg t);
static void do_residency(t_residency *x);

void residency_tilde_setup(void)
{
    t_class *c;
    c = class_new(gensym("residency~"), (t_newmethod)residency_new,
                  (t_method)residency_free,sizeof(t_residency), 0,A_GIMME,0);
    CLASS_MAINSIGNALIN(c, t_residency, x_f);
    class_addmethod(c,(t_method)residency_dsp,gensym("dsp"), A_CANT, 0);
    class_addmethod(c,(t_method)residency_mute,gensym("mute"),A_FLOAT,0);
    class_addmethod(c,(t_method)residency_interpolation,gensym("interpolation"),A_FLOAT,0);
    class_addmethod(c,(t_method)residency_oscbank,gensym("oscbank"),A_FLOAT,0);
    class_addmethod(c,(t_method)residency_transpose,gensym("transpose"),A_FLOAT,0);
    class_addmethod(c,(t_method)residency_synthresh,gensym("synthresh"),A_FLOAT,0);
    class_addmethod(c,(t_method)residency_acquire_sample,gensym("acquire_sample"),  0);
    class_addmethod(c,(t_method)residency_acquire_stop,gensym("acquire_stop"),  0);
    class_addmethod(c,(t_method)residency_playthrough,gensym("playthrough"), A_DEFFLOAT, 0);
    class_addmethod(c,(t_method)residency_force_position,gensym("force_position"), A_FLOAT, 0);

    residency_class = c;
    fftease_announce(OBJECT_NAME);
}

void residency_force_position(t_residency *x, t_floatarg position)
{
    if( position >= 0.0 && position < 1.0 ){
        x->force_pos = position;
    }
}

void residency_meminfo( t_residency *x )
{
    t_fftease *fft = x->fft;
    post("%d frames in buffer", x->framecount);
    post("frame_duration: %f, actual time in buffer: %f", x->tadv, (t_float)(x->framecount) * x->tadv);
    post("main storage chunk: %.2f MB", (x->framecount * (fft->N + 2) * sizeof(t_float)) / 1000000.0 );
}

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

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

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

void residency_verbose(t_residency *x, t_floatarg t)
{
    x->verbose = t;
}

void residency_size(t_residency *x, t_floatarg newsize)
{
    if(newsize > 0.0){//could be horrendous size, but that's the user's problem
        x->duration = newsize/1000.0;
        residency_init(x);
    }
}

void residency_playthrough (t_residency *x, t_floatarg tog)
{
    x->playthrough = tog;
}

void residency_acquire_stop(t_residency *x)
{
    x->acquire_stop = 1;
    x->read_me = 0;
}

void residency_free(t_residency *x){
    int i;
    if(x->fft->initialized){
        for(i = 0; i < x->framecount; i++){
            free(x->loveboat[i]) ;
        }
        free(x->loveboat);
    }
    fftease_free(x->fft);
    free(x->fft);
}

void *residency_new(t_symbol *s, int argc, t_atom *argv)
{
    t_fftease *fft;
    t_residency *x = (t_residency *)pd_new(residency_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"));
    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;

    x->fft->N = FFTEASE_DEFAULT_FFTSIZE;
    x->fft->overlap = FFTEASE_DEFAULT_OVERLAP;
    x->fft->winfac = FFTEASE_DEFAULT_WINFAC;
    x->last_framecount = x->framecount = 0;

    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;
}

void residency_init(t_residency *x)
{
    int i;
    t_fftease *fft = x->fft;
    if(!fft->R){
        return;
    }
    if(fft->initialized == -1){
        return;
    }

    fftease_init(x->fft);

    x->tadv = (t_float)fft->D/(t_float)fft->R;
    if( x->duration <= 0 ){
        x->duration = 1.0;
    }
    if(!x->tadv){
        return;
    }
    x->framecount =  x->duration / x->tadv;
    x->read_me = 0;
    x->acquire_stop = 0;
    if(x->verbose){
        post("%s: will allocate %d frames",OBJECT_NAME, x->framecount);
    }
    // could probably improve memory management here
    if(x->framecount <= 0){
      //  post("bad framecount:%s",x->framecount);
        return;
    }
    if(fft->initialized == 0){
        // x->virgin = 1;
        x->force_pos = -1.0;
        x->current_frame = 0;
        x->fpos = x->last_fpos = 0;

        x->sync = 0;
        x->mute = 0;
        x->playthrough = 0;
        x->frame_increment = 0.0; // frozen by default
        x->verbose = 0;
        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: memory error",OBJECT_NAME);
                return;
            }
        }
    }
    else if((x->framecount == x->last_framecount) && (fft->initialized != 0)){
        return;
    }
    else if(fft->initialized == 1) {
        if(x->framecount != x->last_framecount) {
            // free individual oldies
            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: memory error",OBJECT_NAME);
                    return;
                }
            }
        }
    }

    if(! fftease_msp_sanity_check(fft, OBJECT_NAME)){
        // return 0;
        post("residency~ failed sanity test in Init");
        x->failed_init = 1;
    } else {
        x->failed_init = 0;
    }
    if (fft->D <= 0.0 || fft->R <= 0.0){
        pd_error(0, "%s: bad decimation size or bad sampling rate - cannot proceed",OBJECT_NAME);
        post("D: %d R: %d",fft->D, fft->R);
        return;
    }
    x->last_framecount = x->framecount;
}

static void do_residency(t_residency *x)
{
    int i;
    t_float fframe = x->current_frame ;
    t_float last_fpos = x->last_fpos ;
    int framecount = x->framecount;
    t_float fincr = x->frame_increment;
    t_float fpos = x->fpos;
    t_float force_pos = x->force_pos;
    t_float frak;
    long index1, index2;

    t_fftease *fft = x->fft;

    if(x->acquire_stop){
        x->acquire_stop = 0;
        fpos = (t_float) x->frames_read / (t_float) framecount;
        last_fpos = fpos;
        fframe = x->frames_read;
        if(x->verbose){
            post("residency: data acquisition stopped");
        }
    }
    else if(x->read_me) { // state for sampling to buffer
        if(x->frames_read >= framecount){ // termination condition
            x->read_me = 0;
            if(x->verbose){
                post("residency: data acquisition completed");
            }
        }
        else { // convert and store in one frame
            fftease_fold(fft);
            fftease_rdft(fft,1);
            fftease_convert(fft);
            for(i= 0; i < fft->N + 2; i++){
                x->loveboat[x->frames_read][i] = fft->channel[i];
            }
            ++(x->frames_read);

        }
    }
    else { // a sample is now in the buffer
        if(fpos < 0)
            fpos = 0;
        if(fpos > 1)
            fpos = 1;

        if(force_pos >= 0.0 && force_pos < 1.0){
            //  post("forcing frame to %f", force_pos);
            fframe =  force_pos * (t_float) framecount;
            last_fpos = fpos = force_pos;
            x->force_pos = -1.0;
        }
        else if(fpos != last_fpos){
            fframe =  fpos * (t_float) framecount;
            last_fpos = fpos;
        }
        fframe += fincr;

        while(fframe >= framecount) {
            fframe -= framecount;
        }
        while( fframe < 0. ) {
            fframe += framecount;
        }
        if(x->framecount > 0) {
            x->sync = fframe/(t_float)x->framecount;
        }
        if(x->interpolation_attr == 1){
            index1 = floor(fframe);
            index2 = (index1+1) % x->framecount;
            frak = fframe - (t_float)index1;
            for(i= 0; i < fft->N + 2; i++){
                fft->channel[i] =
                x->loveboat[index1][i] + frak * (x->loveboat[index2][i] - x->loveboat[index1][i]);
            }
        }
        else {
            for(i= 0; i < fft->N + 2; i++){
                fft->channel[i]= x->loveboat[(int)fframe][i];
            }
        }
        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->frame_increment = fincr;
    x->fpos = fpos;
    x->last_fpos = last_fpos;
}

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

    //////////////////////////////////////////////
    t_residency *x = (t_residency *) (w[1]);
    t_float *MSPInputVector = (t_float *)(w[2]);
    t_float *increment = (t_float *)(w[3]);
    t_float *position = (t_float *)(w[4]);
    t_float *MSPOutputVector = (t_float *)(w[5]);
    t_float *vec_sync = (t_float *)(w[6]);
    t_fftease *fft = x->fft;
    int MSPVectorSize = fft->MSPVectorSize;
    int operationRepeat = fft->operationRepeat;
    int operationCount = fft->operationCount;
    t_float *internalInputVector = fft->internalInputVector;
    t_float *internalOutputVector = fft->internalOutputVector;
    int D = fft->D;
    int Nw = fft->Nw;
    t_float *input = fft->input;
    t_float *output = fft->output;
    t_float mult = fft->mult;

    x->frame_increment = *increment;
    x->fpos = *position;
    if( fft->obank_flag )
        mult *= FFTEASE_OSCBANK_SCALAR;

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

    if(x->acquire_stop){
        // will reset flag inside do_residency
        for(i=0; i < MSPVectorSize; i++){ output[i] = 0.0; }
        x->read_me = 0;
    }
    for ( i = 0; i < MSPVectorSize; i++ ){
        vec_sync[i] = x->sync;
    }
    if(x->framecount > 0 && x->read_me )
        x->sync = (t_float)x->frames_read/(t_float)x->framecount;

    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_residency(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_residency(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_residency(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 residency_acquire_sample(t_residency *x)
{
    x->read_me = 1;
    x->frames_read = 0;
    if(x->verbose)
        post("beginning spectral data acquisition");
    return;
}

void residency_mute(t_residency *x, t_floatarg tog)
{
    x->mute = (short) tog;
}

void residency_interpolation(t_residency *x, t_floatarg tog)
{
    x->interpolation_attr = (short) tog;
}

void residency_dsp(t_residency *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){
        residency_init(x);
    }
    if(fftease_msp_sanity_check(fft,OBJECT_NAME)) {
        dsp_add(residency_perform, 6, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec,
                sp[4]->s_vec);
    }
}