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

// ============ KONFIGURASI WIFI UNTUK WOKWI ============
const char* ssid = "Wokwi-GUEST";      // Nama WiFi maya Wokwi
const char* password = "";              // Kosong

// ============ KONFIGURASI THINGSPEAK ============
String apiKey = "ZW3NCRVP5SV077AT";         // Ganti dengan Write API Key anda
const char* server = "https://api.thingspeak.com/update";

// ============ PIN DEFINITIONS ============
const int LED_MERAH = 15;      // Low pressure (below 1000 hPa)
const int LED_HIJAU = 2;       // High pressure (above 1020 hPa)
const int LED_KUNING = 4;      // Normal pressure (1001-1019 hPa)
const int BUZZER = 16;         // Buzzer for low pressure alert
const int BMP_SDA = 27;        // BMP180 SDA pin
const int BMP_SCL = 26;        // BMP180 SCL pin
const int LCD_SDA = 21;
const int LCD_SCL = 22;

// ============ THRESHOLD DEFINITIONS ============
const float HIGH_PRESSURE_THRESHOLD = 1020.0;   // Above 1020 hPa = High pressure
const float LOW_PRESSURE_THRESHOLD = 1000.0;    // Below 1000 hPa = Low pressure
// Normal pressure: 1001 - 1019 hPa

LiquidCrystal_I2C lcd(0x27, 16, 2);
Adafruit_BMP085 bmp;

unsigned long lastTimeSend = 0;
const unsigned long sendInterval = 15000;

void setup() {
  Serial.begin(115200);
  
  // Initialize I2C for BMP180 (custom pins)
  Wire.begin(BMP_SDA, BMP_SCL);
  
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  
  // Initialize pins
  pinMode(LED_MERAH, OUTPUT);
  pinMode(LED_HIJAU, OUTPUT);
  pinMode(LED_KUNING, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  
  // Turn off all LEDs and buzzer initially
  digitalWrite(LED_MERAH, LOW);
  digitalWrite(LED_HIJAU, LOW);
  digitalWrite(LED_KUNING, LOW);
  digitalWrite(BUZZER, LOW);
  
  lcd.setCursor(0, 0);
  lcd.print("Barometric Press");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(1000);
  
  // Initialize BMP180 sensor
  if (!bmp.begin()) {
    Serial.println("BMP180 sensor not found!");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("BMP180 ERROR!");
    lcd.setCursor(0, 1);
    lcd.print("Check wiring!");
    while (1) {
      delay(1000);
    }
  }
  
  Serial.println("BMP180 sensor initialized successfully!");
  
  // Connect to Wokwi WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 20) {
    delay(500);
    Serial.print(".");
    attempts++;
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWiFi Connected!");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());
    
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("WiFi Connected!");
    delay(2000);
  } else {
    Serial.println("\nWiFi Connection Failed!");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("WiFi Failed!");
    delay(2000);
  }
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("System Ready!");
  lcd.setCursor(0, 1);
  lcd.print("Monitoring...");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read pressure from BMP180 (in hPa)
  float pressure = bmp.readPressure() / 100.0;  // Convert Pa to hPa
  float temperature = bmp.readTemperature();     // Read temperature for reference
  
  // Display on LCD
  lcd.setCursor(0, 0);
  lcd.print("Press: ");
  lcd.print(pressure, 1);  // 1 decimal place
  lcd.print(" hPa ");
  
  lcd.setCursor(0, 1);
  
  String weatherStatus = "";
  
  // Determine pressure condition and control LEDs/Buzzer
  if (pressure >= HIGH_PRESSURE_THRESHOLD) {
    // HIGH PRESSURE - Clear, calm weather
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(LED_HIJAU, HIGH);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(BUZZER, LOW);
    weatherStatus = "Cerah/Tenang";
    lcd.print("Cerah/Tenang    ");
    Serial.print("STATUS: HIGH PRESSURE - Clear weather");
    
  } else if (pressure <= LOW_PRESSURE_THRESHOLD) {
    // LOW PRESSURE - Clouds, rain, storms
    digitalWrite(LED_MERAH, HIGH);
    digitalWrite(LED_HIJAU, LOW);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(BUZZER, HIGH);  // Buzzer sounds for low pressure
    weatherStatus = "BADAI!";
    lcd.print("BADAI! Hujan    ");
    Serial.print("STATUS: LOW PRESSURE - Storm warning!");
    
  } else {
    // NORMAL PRESSURE - Moderate weather
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(LED_HIJAU, LOW);
    digitalWrite(LED_KUNING, HIGH);
    digitalWrite(BUZZER, LOW);
    weatherStatus = "Normal";
    lcd.print("Normal/Cerah    ");
    Serial.print("STATUS: NORMAL PRESSURE - Moderate weather");
  }
  
  // Print temperature for monitoring
  Serial.print(" | Pressure: ");
  Serial.print(pressure, 1);
  Serial.print(" hPa | Temp: ");
  Serial.print(temperature, 1);
  Serial.println(" C");
  
  // Send to ThingSpeak every 15 seconds
  if (millis() - lastTimeSend >= sendInterval && WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    
    // Send pressure to field1 and status to field2
    String url = String(server) + "?api_key=" + apiKey + 
                 "&field1=" + String(pressure, 1) +
                 "&field2=" + weatherStatus;
    
    http.begin(url);
    int httpCode = http.GET();
    
    if (httpCode > 0) {
      Serial.println(" ✓ Data sent to ThingSpeak!");
      lcd.setCursor(0, 0);
      lcd.print("Uploaded!     ");
      delay(1000);
      lcd.setCursor(0, 0);
      lcd.print("Press: ");
      lcd.print(pressure, 1);
      lcd.print(" hPa ");
    } else {
      Serial.println(" ✗ Failed to send data to ThingSpeak");
    }
    http.end();
    lastTimeSend = millis();
  }
  
  delay(500);
}