#include "effects/effects.h"

#include <QGridLayout>
#include <QLabel>
#include <QtMath>
#include <QDebug>
#include <stdint.h>

#include "ui/labelslider.h"
#include "ui/collapsiblewidget.h"

VolumeEffect::VolumeEffect(Clip* c) : Effect(c, EFFECT_TYPE_AUDIO, AUDIO_VOLUME_EFFECT) {
    ui_layout->addWidget(new QLabel("Volume:"), 0, 0);
    volume_val = new LabelSlider();
    volume_val->set_minimum_value(0);
    volume_val->set_maximum_value(400);
    ui_layout->addWidget(volume_val, 0, 1);

	// set defaults
    volume_val->set_value(100);
}

Effect* VolumeEffect::copy(Clip* c) {
    VolumeEffect* v = new VolumeEffect(c);
    v->volume_val->set_value(volume_val->value());
    return v;
}

void VolumeEffect::load(QXmlStreamReader* stream) {
    while (!(stream->isEndElement() && stream->name() == "effect") && !stream->atEnd()) {
        stream->readNext();
        if (stream->isStartElement() && stream->name() == "volume") {
            stream->readNext();
            volume_val->set_value(stream->text().toFloat());
        }
    }
}

void VolumeEffect::save(QXmlStreamWriter* stream) {
    stream->writeTextElement("volume", QString::number(volume_val->value()));
}

void VolumeEffect::process_audio(quint8* samples, int nb_bytes) {
    if (volume_val->value() != 100) {
        for (int i=0;i<nb_bytes;i+=2) {
            qint32 samp = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
            double val = qPow(volume_val->value()*0.01, 3);
            samp *= val;
            if (samp > INT16_MAX) {
                samp = INT16_MAX;
            } else if (samp < INT16_MIN) {
                samp = INT16_MIN;
            }

            samples[i+1] = (quint8) (samp >> 8);
            samples[i] = (quint8) samp;
        }
    }
}