#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// ---- Wokwi mock mode (no WiFi libs needed) ----
#define USE_WIFI_NINA 0
#define USE_WIFIESPAT 0

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int TRIG_PIN = 9;
const int ECHO_PIN = 10;
const int DIST_THRESHOLD_CM = 10;
const unsigned long DEBOUNCE_MS = 1200;

unsigned long lastTriggerMs = 0;
bool armed = true;

long readDistanceCm() {
  digitalWrite(TRIG_PIN, LOW); delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH); delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  long duration = pulseIn(ECHO_PIN, HIGH, 30000UL); // 30ms timeout
  if (duration == 0) return 9999;
  return (duration * 34L) / 2000L; // (duration*0.034)/2
}

// ---- Your API config (just for printing in mock mode) ----
const char* BIN_ID     = "bin-123";
const char* DEVICE_ID  = "arduino-uno-01";

long totalCount = 0;

void showCount() {
  lcd.clear();
  lcd.setCursor(0,0); lcd.print("Recycled:");
  lcd.setCursor(0,1); lcd.print(totalCount);
}

void sendEventJSON(long delta) {
  String json = String("{\"bin_id\":\"") + BIN_ID +
                "\",\"device_id\":\"" + DEVICE_ID +
                "\",\"delta\":" + delta + "}";
  Serial.print("[MOCK POST] "); Serial.println(json);
}

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  lcd.init(); lcd.backlight();
  // If LCD is blank, try 0x3F instead of 0x27:
  // LiquidCrystal_I2C lcd(0x3F, 16, 2);
  showCount();
}

void loop() {
  long d = readDistanceCm();
  unsigned long now = millis();

  if (d < DIST_THRESHOLD_CM && armed && (now - lastTriggerMs > DEBOUNCE_MS)) {
    totalCount += 1;
    showCount();
    sendEventJSON(1);
    lastTriggerMs = now;
    armed = false; // wait for object to move away
  }
  if (d >= DIST_THRESHOLD_CM) {
    armed = true;
  }

  delay(50);
}