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

// 1. Definisi Pin Output
const int LED_RED = 17;
const int LED_YELLOW = 18;
const int LED_GREEN = 19;
const int BUZZER = 27;

// 2. Definisi Pin I2C (Gunakan pin yang sama untuk LCD & BMP180)
#define SDA_PIN 12
#define SCL_PIN 14

// 3. Konfigurasi Objek
Adafruit_BMP085 bmp;
LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat 0x27 untuk Wokwi
WiFiClient client;

// 4. Konfigurasi ThingSpeak
unsigned long myChannelNumber = 33323354; 
const char * myWriteAPIKey = "0Y62M2B2XGVR2KSV"; 

void setup() {
  Serial.begin(115200);
  
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  // Mulakan I2C pada pin 12 (SDA) & 14 (SCL)
  Wire.begin(SDA_PIN, SCL_PIN);

  // Inisialisasi LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Sistem Cuaca...");
  
  // Inisialisasi BMP180
  if (!bmp.begin()) {
    Serial.println("BMP180 tidak dijumpai!");
    lcd.setCursor(0, 1);
    lcd.print("Sensor Error!   ");
  }

  // Sambungan WiFi Wokwi
  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() {
  // Baca tekanan udara (convert ke hPa)
  float pressure = bmp.readPressure() / 100.0F;

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

  // Paparan LCD Baris 1
  lcd.setCursor(0, 0);
  lcd.print("Pres: ");
  lcd.print(pressure, 1);
  lcd.print(" hPa  ");

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

  // Logik Indikator Berdasarkan Tekanan Udara
  if (pressure > 1020) {
    lcd.print("High: Cerah     ");
    digitalWrite(LED_GREEN, HIGH);
  } 
  else if (pressure >= 1001 && pressure <= 1019) {
    lcd.print("Norm: Mendung   ");
    digitalWrite(LED_YELLOW, HIGH);
  } 
  else {
    lcd.print("Low: Ribut/Hujan");
    digitalWrite(LED_RED, HIGH);
    tone(BUZZER, 1000);
  }

  // Upload data ke ThingSpeak
  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 20 saat (Syarat akaun percuma ThingSpeak)
  delay(20000); 
}

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