#include "wokwi-api.h"
#include <stdlib.h>
#include <stdint.h>

typedef struct {
  pin_t pin_a0;
  uint32_t attr_moist;
  timer_t timer;
} chip_state_t;

static void tick(void *user_data) {
  chip_state_t *chip = (chip_state_t *)user_data;

  float moist = attr_read_float(chip->attr_moist);
  if (moist < 0) moist = 0;
  if (moist > 100) moist = 100;

  // Capacitive style: wetter -> LOWER voltage
  float x = moist / 100.0f;     // 0..1
  float voltage = (1.0f - x) * 3.3f; // 3.3..0

  pin_dac_write(chip->pin_a0, voltage);
}

void chip_init(void) {
  chip_state_t *chip = (chip_state_t *)calloc(1, sizeof(chip_state_t));
  chip->pin_a0 = pin_init("A0", ANALOG);
  chip->attr_moist = attr_init_float("soilMoisture", 50.0f);

  const timer_config_t cfg = { .callback = tick, .user_data = chip };
  chip->timer = timer_init(&cfg);
  timer_start_ns(chip->timer, 100000000, true);
}