// === Struct untuk rentang fuzzy ===
struct FuzzyRange {
  float aman_min;
  float aman_max;
  float waspada_min;
  float waspada_mid;
  float waspada_max;
  float bahaya_min;
  float bahaya_max;
};

// === Fungsi Keanggotaan Fuzzy ===
float fuzzy_aman(float x, float min, float max) {
  if (x <= min) return 1.0;
  if (x >= max) return 0.0;
  return (max - x) / (max - min);
}

float fuzzy_waspada(float x, float min, float mid, float max) {
  if (x <= min || x >= max) return 0.0;
  if (x <= mid) return (x - min) / (mid - min);
  return (max - x) / (max - mid);
}

float fuzzy_bahaya(float x, float min, float max) {
  if (x <= min) return 0.0;
  if (x >= max) return 1.0;
  return (x - min) / (max - min);
}

// === Fungsi Fuzzy Evaluasi Status ===
void fuzzyStatus(String nama, float ppm, FuzzyRange range) {
  float u_aman = fuzzy_aman(ppm, range.aman_min, range.aman_max);
  float u_waspada = fuzzy_waspada(ppm, range.waspada_min, range.waspada_mid, range.waspada_max);
  float u_bahaya = fuzzy_bahaya(ppm, range.bahaya_min, range.bahaya_max);

  String status;
  if (u_aman >= u_waspada && u_aman >= u_bahaya) status = "AMAN";
  else if (u_waspada >= u_bahaya) status = "WASPADA";
  else status = "BAHAYA";

  Serial.printf("%s | PPM: %.1f | Status: %s\n", nama.c_str(), ppm, status.c_str());
  Serial.printf("  [μ_Aman] = %.2f\n", u_aman);
  Serial.printf("  [μ_Waspada] = %.2f\n", u_waspada);
  Serial.printf("  [μ_Bahaya] = %.2f\n\n", u_bahaya);
}

// === Setup dan Loop ===
void setup() {
  Serial.begin(115200);
  delay(50);
  randomSeed(micros());
}

void loop() {
  // Simulasi data sensor MQ-2
  float ppm_MQ2 = random(0, 12001) / 100.0; // Range: 0–120.00 ppm

  // Rentang fuzzy khusus untuk MQ-2
  FuzzyRange MQ2_range = {
    0, 40,      // AMAN
    30, 60, 90, // WASPADA (min, mid, max)
    80, 120     // BAHAYA
  };

  fuzzyStatus("MQ-2", ppm_MQ2, MQ2_range);

  delay(2000);
}