#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <HTTPClient.h>
#include <time.h>

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

// Telegram details
String botToken = "8747387449:AAEAs61LU8PLJMRp4czMEVkzsIEbadWXHaU";
String chatID = "7025624835";

// Door sensor pin
const int doorPin = 4;

// Location
String projectLocation = "Wokwi Online Simulation";

// Time settings (India)
const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 19800;
const int daylightOffset_sec = 0;

// Previous state
int lastDoorState;

// URL encode function
String urlEncode(String str) {
  String encoded = "";
  char c, code0, code1;

  for (int i = 0; i < str.length(); i++) {
    c = str.charAt(i);

    if (isalnum((unsigned char)c)) encoded += c;
    else if (c == ' ') encoded += "%20";
    else if (c == '\n') encoded += "%0A";
    else if (c == '*') encoded += "%2A";
    else {
      encoded += '%';
      code0 = (c >> 4) & 0xF;
      code1 = c & 0xF;

      code0 = code0 > 9 ? code0 + 'A' - 10 : code0 + '0';
      code1 = code1 > 9 ? code1 + 'A' - 10 : code1 + '0';

      encoded += code0;
      encoded += code1;
    }
  }
  return encoded;
}

// Get date, time, location
String getDateTimeLocation() {
  struct tm timeinfo;

  if (!getLocalTime(&timeinfo)) {
    return "📅 Date: Not Available\n⏰ Time: Not Available\n📍 Location: " + projectLocation;
  }

  char dateStr[20];
  char timeStr[20];

  strftime(dateStr, sizeof(dateStr), "%d-%m-%Y", &timeinfo);
  strftime(timeStr, sizeof(timeStr), "%H:%M:%S", &timeinfo);

  String result = "";
  result += "📅 Date: " + String(dateStr) + "\n";
  result += "⏰ Time: " + String(timeStr) + "\n";
  result += "📍 Location: " + projectLocation;

  return result;
}

// Send Telegram message
void sendTelegram(String text) {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("WiFi not connected");
    return;
  }

  WiFiClientSecure client;
  client.setInsecure();
  HTTPClient https;

  String message = text + "\n\n" + getDateTimeLocation();

  String url = "https://api.telegram.org/bot" + botToken +
               "/sendMessage?chat_id=" + chatID +
               "&parse_mode=Markdown" +
               "&text=" + urlEncode(message);

  Serial.println("Sending...");
  Serial.println(message);

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

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

  String response = https.getString();
  Serial.println(response);

  https.end();
  Serial.println("----------------------");
}

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

  pinMode(doorPin, INPUT_PULLUP);

  // 🔥 FIX: initialize state correctly
  lastDoorState = digitalRead(doorPin);

  Serial.println("Connecting WiFi...");
  WiFi.begin(ssid, password);

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

  Serial.println("\nConnected!");
  Serial.println(WiFi.localIP());

  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  delay(2000);

  sendTelegram("*🚀 SYSTEM STARTED*");
}

void loop() {
  int currentState = digitalRead(doorPin);

  Serial.print("State: ");
  Serial.println(currentState);

  // 🚪 Door Opened
  if (currentState == LOW && lastDoorState == HIGH) {
    Serial.println("Door Opened detected");
    sendTelegram("*🚨 DOOR OPENED 🚨*");
    delay(400); // debounce
  }

  // 🚪 Door Closed
  if (currentState == HIGH && lastDoorState == LOW) {
    Serial.println("Door Closed detected");
    sendTelegram("*✅ DOOR CLOSED*");
    delay(400); // debounce
  }

  lastDoorState = currentState;
}