#include "audioloop.h"

#ifdef __APPLE__
    #include <OpenGL/glu.h>
#else
    #include <GL/glu.h>
#endif

#include "cstdlib"

using namespace std;

AudioLoop::AudioLoop()
    : _cur_sample(0)
    , volume(1)
{
    x = 1.5 * (double(rand())/RAND_MAX - .5);
    y = 1.5 * (double(rand())/RAND_MAX - .5);
}

void AudioLoop::add_samples(const double* samples, unsigned long n_samples) {
    for (unsigned int i = 0; i < n_samples; i++) {
        _audio_vector.push_back(samples[i]);
    }
}

double AudioLoop::get_sample() {
    if (_audio_vector.size() < 10) {
        return 0;
    }

    if (_cur_sample >= _audio_vector.size()) {
        _cur_sample = 0;
    }

    return _audio_vector[_cur_sample++] * volume;
}

void AudioLoop::clear() {
    _audio_vector.clear();
}
    
void AudioLoop::render() {
    glEnable(GL_POINT_SMOOTH);
    glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
    glPointSize(3);
    glLineWidth(2);
    double size_mult = volume;

    glBegin( GL_LINE_STRIP ); {


        unsigned long x_sample_pos = _cur_sample;
        unsigned long y_sample_pos = _cur_sample + 256;

        for( unsigned int i = 0; i < 512; i++ )
        {
            if (x_sample_pos >= _audio_vector.size()) {
                x_sample_pos = 0;
            } 

            if (y_sample_pos >= _audio_vector.size()) {
                y_sample_pos = 0;
            } 

            glVertex2f( size_mult * _audio_vector[x_sample_pos] + x, size_mult * _audio_vector[y_sample_pos] + y);

            x_sample_pos++;
            y_sample_pos++;
        }

    } glEnd();
}