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

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

// ThingSpeak base URL
const char* server = "http://api.thingspeak.com";

// API Key
String apiKey = "9NBJOUZOQJHX8KNG";

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

// Pins
int greenLED = 25;
int yellowLED = 26;
int redLED = 27;
int buzzer = 14;

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);

  // BMP180
  if (!bmp.begin()) {
    Serial.println("BMP180 not found! Continue anyway...");
  }

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

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

  // Connect WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting");

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

  Serial.println("\nWiFi Connected!");
}

void loop() {

  float pressure = bmp.readPressure() / 100.0; // hPa
  String weatherStatus = "";

  // Reset LEDs & buzzer
  digitalWrite(greenLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(redLED, LOW);
  digitalWrite(buzzer, LOW);

  // 🌦️ Pressure Classification
  if (pressure >= 1020) {
    digitalWrite(greenLED, HIGH);
    weatherStatus = "HIGH Pressure(Clear Weather)";
  } 
  else if (pressure >= 1001) {
    digitalWrite(yellowLED, HIGH);
    weatherStatus = "NORMAL Pressure(Moderate weather)";
  } 
  else {
    digitalWrite(redLED, HIGH);
    digitalWrite(buzzer, HIGH);
    weatherStatus = "LOW Pressure(Rain/storm alert)";
  }

  // ✅ Serial display (CLEAN)
  Serial.print("Pressure: ");
  Serial.print(pressure);
  Serial.println(" hPa");

  Serial.print("Status: ");
  Serial.println(weatherStatus);

  // ✅ LCD display
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(pressure);
  lcd.print(" hPa");

  lcd.setCursor(0, 1);
  lcd.print(weatherStatus);

  // 🌐 Encode status for URL (IMPORTANT FIX)
  String encodedStatus = weatherStatus;
  encodedStatus.replace(" ", "%20");
  encodedStatus.replace("(", "%28");
  encodedStatus.replace(")", "%29");

  // 🌐 Send to ThingSpeak
  if (WiFi.status() == WL_CONNECTED) {
    WiFiClient client;
    HTTPClient http;

    String url = String(server) + "/update?api_key=" + apiKey +
                 "&field1=" + String(pressure) +
                 "&field2=" + encodedStatus;

    http.begin(client, url);
    int httpCode = http.GET();

    if (httpCode == 200) {
      Serial.println("ThingSpeak Update Successful");
    } else {
      Serial.print("ThingSpeak Error. HTTP Code: ");
      Serial.println(httpCode);
    }

    http.end();
  } else {
    Serial.println("WiFi disconnected");
  }

  delay(15000); // ThingSpeak limit
}