#include <avr/io.h>

#include "lights.h"

static uint16_t ambient_val;
volatile unsigned char ambient_zone;
static unsigned char ambient_zone_set;

static uint16_t ambient_zones[] = {
	0x0c00, 0x0d00, 0x1000, 0x1800, 0x2800, 0x2f80, 0xffff
};
#define N_AMBIENT_ZONES (sizeof(ambient_zones)/sizeof(ambient_zones[0]))

void init_ambient()
{
	ambient_val = 0;
	ambient_zone = 0;
	ambient_zone_set = 0;
}

void ambient_zone_changed()
{
	log_byte(0xab);
	log_byte(ambient_zone);
	log_word(ambient_val);
	log_flush();

	pattern_reload();
}

void ambient_adc(uint16_t adcval)
{
	unsigned char newzone;

	if (!ambient_zone_set)
		ambient_val = adcval << 4;
	else // running sum
		ambient_val += adcval - (ambient_val >> 4);

	newzone = 0;
	while (newzone < N_AMBIENT_ZONES-1
		&& ambient_zones[newzone] < ambient_val)
		newzone++;

	// TODO: implement hysteresis?
	if (!ambient_zone_set || newzone != ambient_zone) {
		ambient_zone = newzone;
		ambient_zone_set = 1;
		// ambient_zone_changed();
	}
}