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

// ===== WIFI =====
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// ===== THINGSPEAK =====
WiFiClient client;
unsigned long channelNumber =  3323282;
const char* writeAPIKey = 
IXUXLFTP3DUOSS10;

// ===== BMP180 =====
Adafruit_BMP085 bmp;

// ===== LCD =====
LiquidCrystal_I2C lcd(0x27, 16, 2);

// ===== LED & BUZZER =====
int greenLED = 16;
int yellowLED = 17;
int redLED = 18;
int buzzer = 19;

// ===== TIMER =====
unsigned long lastTime = 0;
unsigned long timerDelay = 15000;

void setup() {

  Serial.begin(115200);

  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(buzzer, OUTPUT);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0,0);
  lcd.print("Weather System");

  delay(2000);
  lcd.clear();

  // BMP180
  if (!bmp.begin()) {
    lcd.print("BMP180 Error");
    Serial.println("BMP180 not found");
    while(1);
  }

  // WIFI
  WiFi.begin(ssid, password);

  lcd.print("Connecting WiFi");

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("WiFi Connected");

  lcd.clear();
  lcd.print("WiFi Connected");
  delay(2000);
  lcd.clear();

  ThingSpeak.begin(client);
}

void loop() {

  float pressure = bmp.readPressure() / 100.0;

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

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

  // OFF all
  digitalWrite(greenLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(redLED, LOW);
  digitalWrite(buzzer, LOW);

  // ===== CONDITION =====

  if (pressure > 1020) {

    Serial.println("High Pressure - Clear Weather");
    lcd.setCursor(0,1);
    lcd.print("Clear Weather   ");
    digitalWrite(greenLED, HIGH);
  }

  else if (pressure >= 1001 && pressure <= 1019) {

    Serial.println("Normal Pressure - Moderate");
    lcd.setCursor(0,1);
    lcd.print("Moderate Weather");
    digitalWrite(yellowLED, HIGH);
  }

  else {

    Serial.println("Low Pressure - Rain Alert");
    lcd.setCursor(0,1);
    lcd.print("Rain/Storm Alert");
    digitalWrite(redLED, HIGH);
    digitalWrite(buzzer, HIGH);
  }

  // ===== SEND TO THINGSPEAK =====
  if ((millis() - lastTime) > timerDelay) {

    ThingSpeak.setField(1, pressure);

    int x = ThingSpeak.writeFields(channelNumber, writeAPIKey);

    if (x == 200) {
      Serial.println("ThingSpeak Updated");
    }
    else {
      Serial.println("ThingSpeak Error");
    }

    lastTime = millis();
  }

  delay(2000);
}