#include "project.h"

#define DEBOUNCE 20

static uint8_t r_state;
static uint32_t r_ticks;
static uint8_t r_current;
static uint8_t r_filtered;
static unsigned r_expiry;


#define RAIN_BANK   GPIOA
#define RAIN_GPIO GPIO15

static int
raw_rain (void)
{
  return !gpio_get (RAIN_BANK, RAIN_GPIO);
}


void rain_notify (void)
{
  if (r_current)
    vents_rain_notify();
}


void rain_ticker (void)
{
  unsigned s;
  static int ticker = 0;


  s = raw_rain();

  if (s == r_state) {
    if (r_ticks < DEBOUNCE)
      r_ticks++;
    else if (r_ticks == DEBOUNCE) {
      r_current = s;
      r_ticks++;
      printf ("D: rain state now %d\r\n", r_current);
    }
  } else {
    r_ticks = 0;
    r_state = s;
  }

  if (r_current) {
    r_filtered = 1;
    r_expiry = 1800;
  }

  rain_notify();

  ticker++;

  if (ticker < 1000) return;

  ticker = 0;

  if (r_expiry)
    r_expiry--;
  else
    r_filtered = r_current;

}

void rain_slow_ticker (void)
{
  printf ("R: %d %d\r\n", r_current, r_filtered);
}


int rain_filtered_state (void)
{
  return r_filtered;
}

int rain_state (void)
{
  return r_current;
}

char rain_state_char (void)
{
  return r_current ? 'Y' : 'N';
}

void
rain_init (void)
{
  gpio_set_mode (RAIN_BANK, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN,
                 RAIN_GPIO);

  gpio_set (RAIN_BANK, RAIN_GPIO);
}