#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h> // Include ArduinoJson library

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

// Google Script deployment URL
const char* googleScriptURL = "https://script.google.com/a/macros/student.uitm.edu.my/s/AKfycbyBgGPd9C3GbF1eh7JyZ0DkaJeEUQx-SiJhopH3ojxOp_q8_fNmBH_Qz7StOS5eyu0K/exec";

// Pins for components
const int photoelectricPin = 4; // Simulated by a button
const int buzzerPin = 15;
const int ledPin = 16;

// Variables
bool fireDetected = false;

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

  pinMode(photoelectricPin, INPUT_PULLUP); // Assuming normally HIGH with pull-up resistor
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);

  // Initialize Wi-Fi
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
}

void loop() {
  // Check photoelectric sensor (button simulation)
  fireDetected = digitalRead(photoelectricPin) == LOW; // Simulated LOW when fire detected
  
  if (fireDetected) {
    Serial.println("Fire detected!");

    // Activate alarm
    digitalWrite(buzzerPin, HIGH);
    flashLED(); // Flash LED to indicate alarm

    // Send data to Google Sheets
    sendDataToGoogleSheets();

    // Wait to prevent continuous alarms
    delay(5000); // 5 seconds delay
  } else {
    digitalWrite(buzzerPin, LOW);
    digitalWrite(ledPin, LOW);
  }
}

void flashLED() {
  for (int i = 0; i < 5; i++) {
    digitalWrite(ledPin, HIGH);
    delay(200);
    digitalWrite(ledPin, LOW);
    delay(200);
  }
}

void sendDataToGoogleSheets() 
{
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin(googleScriptURL);
    http.addHeader("Content-Type", "application/json");

    // Create JSON payload
    DynamicJsonDocument doc(200); // Use DynamicJsonDocument for variable-size JSON
    doc["Date"] = getDate();
    doc["Time"] = getTime();
    doc["Fire Detected"] = "Yes";

    String json;
    serializeJson(doc, json);

    int httpResponseCode = http.POST(json);

    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Error on sending POST: ");
      Serial.println(httpResponseCode);
    }

    http.end();
  } else {
    Serial.println("WiFi not connected");
  }
}

// Dummy functions to simulate date and time
String getDate() {
  return "2024-06-30"; // Replace with real date function
}

String getTime() {
  return "12:34:56"; // Replace with real time function
}