#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <lv2.h>

struct ducker
{
	double sample_rate;
	float on_factor;
	float off_factor;

	float *in_main_l;
	float *in_main_r;
	float *in_aux_l;
	float *in_aux_r;
	float *out_l;
	float *out_r;
};

static LV2_Handle ducker_instantiate(
	const LV2_Descriptor *descriptor,
	double sample_rate,
	const char *bundle_path,
	const LV2_Feature *const *host_features)
{
	/* Allocate local data */
	struct ducker *d = malloc(sizeof *d);
	if (d == NULL) {
		return NULL;
	}

	memset(d, 0, sizeof *d);

	d->sample_rate = sample_rate;

	d->on_factor  = 0.0006f * 44100.0f / sample_rate;
	d->off_factor = 0.00028f * 44100.0f / sample_rate;

	return (LV2_Handle)d;
}

static void ducker_connect_port(LV2_Handle lv2instance, uint32_t port, void *data)
{
	struct ducker *d = (struct ducker *)lv2instance;

	/* Audio ports */
	switch (port) {
		case 0: d->in_main_l = data; break;
		case 1: d->in_main_r = data; break;
		case 2: d->in_aux_l = data; break;
		case 3: d->in_aux_r = data; break;
		case 4: d->out_l = data; break;
		case 5: d->out_r = data; break;
	}
}

static void ducker_run(LV2_Handle lv2instance, uint32_t sample_count)
{
	struct ducker *d = (struct ducker *)lv2instance;

	while (sample_count--) {
	}
}

static void ducker_cleanup(LV2_Handle lv2instance)
{
	struct ducker *d = (struct ducker *)lv2instance;

	free(d);
}

static const LV2_Descriptor s_lv2descriptor =
{
	.URI = "http://fuzzle.org/~petern/ducker/1",
	.instantiate = &ducker_instantiate,
	.connect_port = &ducker_connect_port,
	.run = &ducker_run,
	.cleanup = &ducker_cleanup,
};

const LV2_Descriptor *lv2_descriptor(uint32_t index)
{
	if (index == 0) {
		return &s_lv2descriptor;
	}

	return NULL;
}