#include <Wire.h>
#include <Adafruit_BMP085.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "ThingSpeak.h"

// ✅ 1. Pin Output (UPDATED)
const int LED_RED = 23;     // changed from 21 → 23
const int LED_YELLOW = 16;
const int LED_GREEN = 18;
const int BUZZER = 13;

// ✅ 2. I2C Pins (SAFE DEFAULT)
#define SDA_PIN 21
#define SCL_PIN 22

// ✅ 3. Objects
Adafruit_BMP085 bmp;
LiquidCrystal_I2C lcd(0x27, 16, 2);
WiFiClient client;

// ✅ 4. ThingSpeak
unsigned long myChannelNumber = 3323326; 
const char * myWriteAPIKey = "H3I1G9KQRNUJSPAF"; 

void setup() {
  Serial.begin(115200);

  pinMode(LED_RED, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  // ✅ FIXED I2C
  Wire.begin(SDA_PIN, SCL_PIN);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Sistem Cuaca...");

  // ✅ BMP180 Check
  if (!bmp.begin()) {
    Serial.println("BMP180 tidak dijumpai!");
    lcd.setCursor(0, 1);
    lcd.print("Sensor Error!   ");
  } else {
    Serial.println("BMP180 OK!");
  }

  // ✅ WiFi
  Serial.print("Connecting WiFi...");
  lcd.setCursor(0, 1);
  lcd.print("WiFi Connecting.");

  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println(" Connected!");
  lcd.setCursor(0, 1);
  lcd.print("WiFi Connected! ");

  ThingSpeak.begin(client);
  delay(2000);
  lcd.clear();
}

void loop() {
  float pressure = bmp.readPressure() / 100.0F;

  Serial.print("Pressure: ");
  Serial.print(pressure);
  Serial.println(" hPa");

  lcd.setCursor(0, 0);
  lcd.print("Pres: ");
  lcd.print(pressure, 1);
  lcd.print(" hPa  ");

  resetIndicators();
  lcd.setCursor(0, 1);

  if (pressure > 1020) {
    lcd.print("High: Cerah     ");
    Serial.println("High Pressure - Clear Weather");
    digitalWrite(LED_GREEN, HIGH);
  } 
  else if (pressure >= 1001 && pressure <= 1019) {
    lcd.print("Norm: Mendung   ");
    Serial.println("Normal Pressure - Moderate Weather");
    digitalWrite(LED_YELLOW, HIGH);
  } 
  else {
    lcd.print("Low: Ribut/Hujan");
    Serial.println("Low Pressure - Rain/Storm Alert");
    digitalWrite(LED_RED, HIGH);
    tone(BUZZER, 1000);
  }

  // ✅ ThingSpeak Upload
  ThingSpeak.setField(1, pressure);
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if (x == 200) {
    Serial.println("Update ThingSpeak Berjaya");
  } else {
    Serial.println("Ralat ThingSpeak: " + String(x));
  }

  delay(20000);
}

void resetIndicators() {
  digitalWrite(LED_RED, LOW);
  digitalWrite(LED_YELLOW, LOW);
  digitalWrite(LED_GREEN, LOW);
  noTone(BUZZER);
}