Smart Parking System

#include 
#include 
#include 
#include 

#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);

Servo entryServo, exitServo;
SoftwareSerial espSerial(A4, A5);  // RX, TX for ESP8266

// tototal slots
#define MAX_SLOTS 20
#define ACTIVE_SLOTS 20

// IR sensor pins
const int irSlots[MAX_SLOTS] = {
  A0, A1, A2  // only first 3 used now
};

// Feedback components
const int greenLED = 2, redLED = A3, buzzer = A3;

// Ultrasonic sensor pins
const int entryTrig = 7, entryEcho = 8;
const int exitTrig = 3, exitEcho = 4;

int maxCars = ACTIVE_SLOTS;
int carCount = 0;

// List of valid UIDs
String validUIDs[] = { "DE67E056", "E38839DA", "9A755032", 
                        "B94C3B6", "BA1D4732", "128F3A6" };
String onlineBookedAll = "";  // slots booked by others
// Track UIDs currently inside
String activeUIDs[MAX_SLOTS];  // maxCars = 3, so tracking 3 UIDs
int activeSlots[MAX_SLOTS];    // slot used by UID

// ===== ONLINE SLOT DATA FROM ESP8266 =====
int onlineBookedSlot = 0;     // slot booked for this UID (0 = none)
String onlineFreeSlots = "";  // online available slots
bool onlineDataReady = false;

        

#include 
#include 
#include 
#include 

// Communication with Arduino
#define RX_PIN D2  // GPIO4
#define TX_PIN D3  // GPIO0
SoftwareSerial mySerial(RX_PIN, TX_PIN);

// Wi-Fi credentials
const char* ssid = "AirFiber-MADAN";
const char* password = "Madan@2004";

String onlineBookedAll = "";  // slots booked by ANY user


// 🔍 SLOT CHECK (booking logic)
// SP-INDEX SCRIPT NAME
const char* CHECK_URL =
  "https://script.google.com/macros/s/AKfycbwjUVLU94eyOB6TGJ_kmw1Svg9na6JiQh8jXX-jvK505IFTNOxUhdofyg0Rqs6xZDAm/exec";

// 📩 ENTRY / EXIT → Sheet + Email
// SP-ADMIN PANEL SCRIPT NAME
const char* LOG_URL =
  "https://script.google.com/macros/s/AKfycbyS5PV6vPUtk6CYMX2_gR6hwxlDHjtKPGw3fNUIFw7a5NexX5SdZaKSExGwjtUTHtvN1A/exec";

void setup() {
  Serial.begin(115200);
  mySerial.begin(9600);

  Serial.println("\nConnecting to WiFi...");
  WiFi.begin(ssid, password);

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

  Serial.println("\n✅ WiFi Connected!");
  Serial.println("You can manually type data like:");
  Serial.println("ENTRY:DE67E056:3:1 or EXIT:DE67E056:3:1 and ENTRY:E38839DA:3:1 or EXIT:E38839DA:3:1");
  Serial.println("-----------------------------------------------------------------------------------");
}

void loop() {
  String input = "";

  // Read from Arduino
  if (mySerial.available()) {
    input = mySerial.readStringUntil('\n');
  }

  // Read from Serial Monitor
  if (Serial.available()) {
    input = Serial.readStringUntil('\n');
  }

  if (input.length() > 0) {
    input.trim();
    Serial.println("📩 Received: " + input);

    if (input.startsWith("CHECK:")) {
      handleCheckRequest(input);
    } else if (input.startsWith("ENTRY:") || input.startsWith("EXIT:")) {
      processAndUpload(input);
    } else {
      Serial.println("⚠️ Invalid format. Use CHECK:UID or ENTRY/EXIT");
    }
  }
}

/*
// 🔧 Function to get vehicle number based on UID
String getVehicleNumber(String uid) {
  // Add your UID–Vehicle mappings here
  if (uid == "DE67E056") return "KA09MA1100";
  else if (uid == "E38839DA") return "KA09MA1234";
  else if (uid == "ABCD1234") return "KA09MA6969";

  // Default if UID not found
  return "UNKNOWN";
}
*/

String getVehicleNumber(String uid) {
  return "";  // ESP8266 will NOT set vehicle number
}


void processAndUpload(String data) {
  String type = data.startsWith("ENTRY:") ? "ENTRY" : "EXIT";
  data = data.substring(type.length() + 1);  // remove prefix

  // Split by colons
  int firstColon = data.indexOf(':');
  int secondColon = data.indexOf(':', firstColon + 1);

  if (firstColon == -1 || secondColon == -1) {
    Serial.println("⚠️ Invalid data format! Use ENTRY:UID:AvailableSlots:AssignedSlot");
    return;
  }

  String uid = data.substring(0, firstColon);
  String availableSlots = data.substring(firstColon + 1, secondColon);
  String assignedSlot = data.substring(secondColon + 1);
  String vehicleNo = getVehicleNumber(uid);  // ✅ Auto vehicle lookup

  String url = String(LOG_URL) + "?uid=" + uid + "&type=" + type + "&availableSlots=" + availableSlots + "&assignedSlot=" + assignedSlot + "&vehicleNo=" + vehicleNo;

  WiFiClientSecure client;
  client.setInsecure();

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

  if (httpCode == 200) {
    String response = http.getString();
    Serial.println("HTTP Error Code:");
    Serial.println("Response: " + response);
  } else {
    Serial.println("✅ Data uploaded successfully!:" + String(httpCode));
  }

  http.end();
}

void handleCheckRequest(String data) {
  String uid = data.substring(6);
  uid.trim();

  Serial.println("🌐 Checking online slot for UID: " + uid);

  String url = String(CHECK_URL) + "?action=checkSlot" + "&uid=" + uid;

  WiFiClientSecure client;
  client.setInsecure();

  HTTPClient http;
  http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
  http.addHeader("User-Agent", "ESP8266");

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

  Serial.println("HTTP Code: " + String(httpCode));

  if (httpCode != 200) {
    Serial.println("❌ Slot check HTTP failed");
    http.end();
    return;
  }

  String response = http.getString();
  http.end();

  Serial.println("📥 Server Response:");
  Serial.println(response);

  int bookedIndex = response.indexOf("\"bookedSlot\":");
  int allowedIndex = response.indexOf("\"allowedSlots\":");

  int bookedSlot = 0;
  String freeSlots = "";

  if (bookedIndex >= 0) {
    bookedSlot = response.substring(bookedIndex + 13).toInt();
  }

  if (allowedIndex >= 0) {
    int start = response.indexOf("[", allowedIndex);
    int end = response.indexOf("]", allowedIndex);
    if (start >= 0 && end >= 0) {
      freeSlots = response.substring(start + 1, end);
      freeSlots.replace(" ", "");
    }
  }


  // 🔒 BUILD BOOKED-ALL-SLOTS SAFELY
  onlineBookedAll = "";

  for (int i = 1; i <= 20; i++) {
    String token = "," + String(i) + ",";
    String list = "," + freeSlots + ",";

    // if slot NOT found as whole number → booked
    if (list.indexOf(token) == -1) {
      if (onlineBookedAll.length() > 0) onlineBookedAll += ",";
      onlineBookedAll += String(i);
    }
  }

  Serial.println("🔐 All Booked Slots: " + onlineBookedAll);


  String reply = "ONLINE:MYBOOKED=" + String(bookedSlot) + ":BOOKEDALL=" + onlineBookedAll + ":FREE=" + freeSlots;

  mySerial.println(reply);
  Serial.println("📤 Sent to Arduino: " + reply);
}