#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 = "15ZIZI45ESPRUAOO";

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

// Pins
int greenLED = 26;
int yellowLED = 25;
int redLED = 33;
int buzzer = 17;

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

  Wire.begin(21, 22);

  // BMP180
  if (!bmp.begin()) {
    Serial.println("BMP180 not found! Check wiring!");
    while (1);
  }

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

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

  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;

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

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

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

  // Logic
  if (pressure >= 1020) {
    digitalWrite(greenLED, HIGH);
  } 
  else if (pressure >= 1001) {
    digitalWrite(yellowLED, HIGH);
  } 
  else {
    digitalWrite(redLED, HIGH);
    digitalWrite(buzzer, HIGH);
  }

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

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

    Serial.println(url); // debug

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

    Serial.print("HTTP Code: ");
    Serial.println(httpCode);

    if (httpCode == 200) {
      Serial.println("Data sent OK");
    } else {
      Serial.println("Failed to send");
    }

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

  delay(15000);
}